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1
Udayakumar, Muthulingam, and Thangavel Sekar. "Leaf Traits of Trees in Tropical Dry Evergreen Forests of Peninsular India." Ecologies 2, no. 3 (July 21, 2021): 268–84. http://dx.doi.org/10.3390/ecologies2030015.
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A plant functional trait study was conducted to know the existing relationship between important leaf traits namely, specific leaf area (SLA), leaf dry matter content (LDMC), and leaf life span (LL) in tropical dry evergreen forest (TDEFs) of Peninsular India. Widely accepted methodologies were employed to record functional traits. The relationships between SLA and LDMC, LDMC and LL, and SLA and LL were measured. Pearson’s coefficient of correlation showed a significant negative relationship between SLA and LDMC, and SLA and LL, whereas a significant positive relationship was prevailed between LDMC and LL. The mean trait values (SLA, LDMC, and LL) of evergreens varied significantly from deciduous species. SLA had a closer relationship with LDMC than LL. Similarly, LL had a closer relationship with SLA than LDMC. Species with evergreen leaf habits dominated forest sites under study. Evergreen species dominate the study area with a high evergreen-deciduous ratio of 5.34:1. The S strategy score of trees indicated a relatively higher biomass allocation to persistent tissues. TDEFs occur in low elevation, semiarid environment, but with the combination of oligotrophic habitat, high temperature and longer dry season these forests were flourishing as a unique evergreen ecosystem in the drier environment. The relationships found between leaf traits were in concurrence with earlier findings. Trees of TDEFs survive on the poor-nutrient habitat with a low SLA, high LDMC, and LL. This study adds baseline data on key leaf traits to plant functional trait database of India.
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Singhal, J., T. R. Kiranchand, G. Rajashekar, and C. S. Jha. "Automated Burned Area Delineation Using IRS AWiFS satellite data." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XL-8 (December 23, 2014): 1429–32. http://dx.doi.org/10.5194/isprsarchives-xl-8-1429-2014.
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India is endowed with a rich forest cover. Over 21% of country’s area is covered by forest of varied composition and structure. Out of 67.5 million ha of Indian forests, about 55% of the forest cover is being subjected to fires each year, causing an economic loss of over 440 crores of rupees apart from other ecological effects. Studies carried out by Forest Survey of India reveals that on an average 53% forest cover of the country is prone to fires and 6.17% of the forests are prone to severe fire damage. Forest Survey of India in a countrywide study in 1995 estimated that about 1.45 million hectares of forest are affected by fire annually. According to Forest Protection Division of the Ministry of Environment and Forest (GOI), 3.73 million ha of forests are affected by fire annually in India. Karnataka is one of the southern states of India extending in between latitude 110 30' and 180 25' and longitudes 740 10' and 780 35'. As per Forest Survey of India's State of Forest Report (SFR) 2009, of the total geographic area of 191791sq.km, the state harbors 38284 sq.km of recorded forest area. Major forest types occurring in the study area are tropical evergreen and semi-evergreen, tropical moist and dry deciduous forests along with tropical scrub and dry grasslands. Typical forest fire season in the study area is from February–May with a peak during March-April every year, though sporadic fire episodes occur in other parts of the year sq.km, the state harbors 38284 sq.km of recorded forest area. Major forest types occurring in the study area are tropical evergreen and semi-evergreen, tropical moist and dry deciduous forests along with tropical scrub and dry grasslands. Significant area of the deciduous forests, scrub and grasslands is prone to recurrent forest fires every year. <br><br> In this study we evaluate the feasibility of burned area mapping over a large area (Karnataka state, India) using a semi-automated detection algorithm applied to medium resolution multi spectral data from the IRS AWiFS sensor. The method is intended to be used by non-specialist users for diagnostic rapid burnt area mapping.
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Udayakumar, Muthulingam, and Narayanaswamy Parthasarathy. "Angiosperms, tropical dry evergreen forests of southern Coromandel coast, India." Check List 6, no. 3 (August 1, 2010): 368. http://dx.doi.org/10.15560/6.3.368.
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We provide a check list of angiosperm plant species with their bioresource potential as medicinal plants enumerated from a total of seventy-five tropical dry evergreen forest sites along the Coromandel coast of peninsular India. These are poorly known sites even within Indian sub-continent and form an under-studied forest type. Tropical dry evergreen forests harbour 312 species belonging to 251 genera and 80 families. The families with the greatest numbers of species were Euphorbiaceae (20 species), Apocynaceae (18 species), Rubiaceae (15), Fabaceae (12), Mimosaceae (11) and Capparaceae and Asteraceae (10 each). Physiognomically evergreen species dominated the forest. Plant specimens are identified and confirmed using regional floras. These forests are conserved by the local people on religious ground as sacred groves, although they are also subjected to various levels of anthropogenic impacts.
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ZHU, HUA. "Floristic divergence of the evergreen broad-leaved forests in Yunnan, southwestern China." Phytotaxa 393, no. 1 (February 20, 2019): 1. http://dx.doi.org/10.11646/phytotaxa.393.1.1.
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The Yunnan boast three broad-leaved forests, the semi-wet evergreen broad-leaved forest (SWEB) occurring in subtropical plateaus areas, the lower montane evergreen broad-leaved forest (LMEB) in tropical lower montane, and the upper montane evergreen broad-leaved forest (UMEB) in subtropical upper montane regions. Floristic composition and biogeography of these evergreen broad-leaved forests are studied and their diversification and divergence are revealed. I found similarities across the three forest types with species-rich families tending to have cosmopolitan distributions and families with less species exhibiting other distribution types. In biogeographical elements, the SWEB and the UMEB showed similar affinity in the proportion of tropical elements comprising total genera, specifically 45% and 44% respectively, and temperate elements totaling 46% and 48%, of all genera with northern temperate distribution comprising the highest ratio (18% in the SWEB and 20% in the UMEB ). LMEB tropical elements comprised 79% of the total genera, with tropical Asian distributed elements contributing the highest ratio (27%). While the three forest floras comprised of similar families, the same is not true at the genus and species levels. I suggest our results indicate divergence of the three forest floras, possibly from events in the geological history of Yunnan. From recent palaeobotanical studies, the diversification of floras of these evergreen broad-leaved forests in Yunnan occurred during the late Miocene with increased divergence with time in response not only to altitude changes and at the same time global cooling in Yunnan, but also the southeastward extrusion of Indochina geoblock influencing LMEB, and the Himalayan uplift affecting the floras of SWEB and UMEB.
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Yao Liu, Wen, John E. D. Fox, and Zai Fu Xu. "Community characteristics, species diversity and management of middle-mountain moist evergreen broad-leaved forest in the Ailao Mountains, Southwestern China." Pacific Conservation Biology 7, no. 1 (2001): 34. http://dx.doi.org/10.1071/pc010034.
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Middle-mountain, moist, evergreen broad-leaved forest is an important forest type of Yunnan Province, SW China. Species composition, vegetation structure, physiognomy, diversity and phenology of this forest in Ailao Mountain were surveyed. The forest has characteristics common to subtropical, evergreen broad-leaved forest elsewhere in China. It also has local features associated with the middle-mountain location at lower latitude and higher altitude, including relatively high humidity and mild temperatures all year. The forest is dominated by species unique to Yunnan. There is a well-developed bamboo layer, fewer megaphanerophytes, more microphylls, more lianas and more epiphytes than in other subtropical evergreen broad-leaved forests. Floristically, elements of tropical, temperate and endemic flora comprise 54, 43 and 3% of the genera, while tropical, temperate and endemics account for 22, 38 and 40% of the species in the forest. Two-thirds of the trees and shrubs have leaves with drip tips in varying degree. The phenological rhythm of the forest is similar to that of a tropical forest, with plants flowering and bearing fruits almost throughout the year. Species diversity is richer than that of other evergreen broad-leaved forests in central Yunnan. Some management strategies and priorities for this forest are suggested.
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Tun, Phyu Thaw, Thanh Thi Nguyen, and Andreas Buerkert. "Transformation of Agricultural Landscapes and Its Consequences for Natural Forests in Southern Myanmar within the Last 40 Years." Remote Sensing 15, no. 6 (March 11, 2023): 1537. http://dx.doi.org/10.3390/rs15061537.
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Kyunsu township comprises coastal regions and a multitude of small islands covered by vast tropical evergreen and mangrove forests, and a large water body in the Adman Sea of Myanmar. Due to population growth, residents have increasingly expanded their agricultural land areas into natural tropical evergreen and mangrove forests, leading to deforestation. Understanding the processes and consequences of landscape transformation for surrounding ecosystems is crucial for local policy making and for fostering sustainable crop production in this area. Landsat datasets from 1978, 1989, 2000, 2011, and 2020 were used in a time-series post-classification approach to investigate land use land cover (LULC) changes in the Kyunsu township of Southern Myanmar across the last 40 years. Our study also attempted to assess the effects of the transformation of LULC on carbon stocks. Between 1978 and 2020, major LULC changes occurred with the expansion of Paddy Fields (+90%), Plantations (+11%), Open Forests (+81%), Settlement Areas (+115%), Aquaculture Areas (+1594%), and Others (+188%) while the area covered with Closed Forests shrunk by 44% and with Mangrove Forests by 9%. Water Bodies expanded by 0.13%. Our analyses show that between 1978 and 2020 2453 ha of Paddy Fields expanded into Plantations, 1857 ha to Open Forests, and 1146 ha to Mangrove Forests. Additionally, 12,135 ha of Open Forests, 8474 ha of Closed Forests, and 2317 ha of Mangrove Forests became Plantations. Across the 40 year study period, a total of 40,523 ha of Closed Forests were transformed to Open Forests. Our findings show that transformation of agricultural landscapes in the study area significantly affected deforestation and forest degradation of tropical evergreen rain forests and mangrove forests which are vital sources of ecosystem services. These transformations led to estimated losses of carbon stocks between 1978 and 2020 ranged from 89,260–5,106,820 Mg (average of 1,723,250 Mg) in our study area. Our findings call for sustainable resource intensification to increase production efficiency in existing cultivated areas rather than crop land expansion into natural forests. In addition, our data highlight the need for rigorous policies to conserve and protect tropical natural evergreen and mangrove forest, as key local resources providing multiple ecosystem services.
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Pratibha, K. "Recalcitrant Seed Storage Behaviour of Tropical Forest Tree Species." Mapana - Journal of Sciences 3, no. 1 (November 18, 2004): 65–74. http://dx.doi.org/10.12723/mjs.5.8.
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Forest wealth plays an important role in a country's economic and ecological sta bility. Forests Of tropical countries are declining of an alarming speed due to the interference Of many factors urbanization, industrialization etc. Ecch r 16 mill ion hectares Of virgin forests are cut and burnt. Tropical forest, o storehouse o' Biodiversity for of the world. Indio possesses almost entire range of tropical forest, from dry deciduous to wet evergreen. There is an imbalance in the environment due to deforestation and nudation.
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Kumar, Ranjeet, Bhaskor Rajbonshi, Dhruba Das, Praveen Verma, H. Bora, and Alok Yadav. "Ground flora in Assam Valley Tropical Wet Evergreen Forest." Indian Journal of Forestry 37, no. 4 (December 1, 2014): 457–64. http://dx.doi.org/10.54207/bsmps1000-2014-i83e3t.
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The present investigations were carried out in Jeypore Reserve Forests in Assam valley tropical wet evergreen forests. Phytosociological analysis was carried out as per standard methodology. Total 28 family, 47 genus and 53 species were observed. The poaceae was most dominant family. The Shannon – Winner index (H) for herbs ranges from 1.59 to 3.16. The present study will provide the baseline information for biodiversity conservation of tropical wet evergreen forests.
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Sakschewski, Boris, Werner von Bloh, Markus Drüke, Anna Amelia Sörensson, Romina Ruscica, Fanny Langerwisch, Maik Billing, et al. "Variable tree rooting strategies are key for modelling the distribution, productivity and evapotranspiration of tropical evergreen forests." Biogeosciences 18, no. 13 (July 12, 2021): 4091–116. http://dx.doi.org/10.5194/bg-18-4091-2021.
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Abstract. A variety of modelling studies have suggested tree rooting depth as a key variable to explain evapotranspiration rates, productivity and the geographical distribution of evergreen forests in tropical South America. However, none of those studies have acknowledged resource investment, timing and physical constraints of tree rooting depth within a competitive environment, undermining the ecological realism of their results. Here, we present an approach of implementing variable rooting strategies and dynamic root growth into the LPJmL4.0 (Lund-Potsdam-Jena managed Land) dynamic global vegetation model (DGVM) and apply it to tropical and sub-tropical South America under contemporary climate conditions. We show how competing rooting strategies which underlie the trade-off between above- and below-ground carbon investment lead to more realistic simulation of intra-annual productivity and evapotranspiration and consequently of forest cover and spatial biomass distribution. We find that climate and soil depth determine a spatially heterogeneous pattern of mean rooting depth and below-ground biomass across the study region. Our findings support the hypothesis that the ability of evergreen trees to adjust their rooting systems to seasonally dry climates is crucial to explaining the current dominance, productivity and evapotranspiration of evergreen forests in tropical South America.
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NATH, Snigdha, Kanda N. BABU, Ashaq A. DAR, and Narayanaswamy PARTHASARATHY. "Increasing liana biomass and carbon stocks in tropical dry evergreen forests of southern India." Notulae Scientia Biologicae 14, no. 3 (September 23, 2022): 11279. http://dx.doi.org/10.55779/nsb14311279.
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Tropical forests act as a great carbon reservoir covering about 30% of the global carbon content, however, structural alteration of these forests caused by forest disturbances adversely affects the carbon cycle. One such structural change happening in these tropical forests is the increasing dominance of lianas (woody climbers). Among various tropical forest types, lianas are an integral constituent of the tropical dry evergreen forests (TDEFs) found in peninsular India. A re-inventory of lianas was carried out to observe temporal changes in basal area and carbon stock in two 1-ha permanent plots of two disturbed tropical dry evergreen forest sites (TDEF; Oorani -OR and Puthupet - PP) over a 19-year interval (2001-2020). The total basal area in OR and PP increased respectively by 2.26 m2 ha-1 and 0.93 m2 ha-1. The total biomass and the carbon stock in OR and PP increased by 82% and 51% respectively. The dominant species Strychnos lenticellata showed an increase in its basal area by three-fold in OR, whereas, in PP, a marginal increase of 4% was observed. The lower diameter class (1-6 cm) showed an increase in basal area in OR and PP by 101% and 16% respectively. The mid-diameter class (6-11 cm) was the top contributor of the total biomass/carbon in both OR and PP in the latest re-inventory (2020). The present results show that lianas, although known to negatively affect the forest biomass/carbon stock, play an important role in carbon sequestration, thus providing insights into their ecological importance which will certainly be useful in proposing strategies for the conservation of this forest type dominated by lianas.
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Lusk, Christopher H. "Leaf functional trait variation in a humid temperate forest, and relationships with juvenile tree light requirements." PeerJ 7 (May 8, 2019): e6855. http://dx.doi.org/10.7717/peerj.6855.
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The species-rich arborescent assemblages of humid tropical forests encompass much of the known range of the leaf economics spectrum, often including >20-fold variation in leaf lifespan. This suite of traits underpins a life-history continuum from fast-growing pioneers to slow-growing shade-tolerant species. Less is known about the range of leaf traits in humid temperate forests, and there are conflicting reports about relationships of these traits with the light requirements of temperate evergreen angiosperms. Here I quantify the range of leaf functional traits in a New Zealand temperate evergreen forest, and relationships of these traits with light requirements of juvenile trees and shrubs. Foliage turnover of saplings of 19 evergreen angiosperms growing beneath gaps (12–29% canopy openness) and in understories (1.2–2.9%) was measured over 12 months. Dry mass per area (LMA), dry matter content, thickness, density and nitrogen content (N) of leaves were also measured. Species minimum light requirements were indexed as the 10th percentile of the distribution of saplings in relation to canopy openness. Interspecific variation of leaf lifespan was ∼6-fold in gaps (0.6 to 3.8 yrs), and ∼11-fold in the understorey (0.7 to 7.7 yrs). Six small tree and shrub species are effectively leaf-exchangers, with leaf lifespans of c.1 year in gaps—albeit usually longer in the shade. Interspecific variation in other leaf traits was 2.5 to 4-fold. Lifespans and LMA of both sun and shade leaves were negatively correlated with species light requirements i.e., positively correlated with shade tolerance. However, light environment (gap vs shade) explained about the same amount of variation in LMA as species’ identity did. Species light requirements were not significantly correlated with leaf N, dry matter content, density or thickness—except for a marginally significant correlation with dry matter content of shade leaves. Species light requirements were thus less consistently related to leaf structural traits than appears to be the case in humid tropical forests. Whereas the wide interspecific variation in leaf economic traits of tropical rainforest species outweighs plastic response to light availability, temperate evergreen woody angiosperms appear to occupy a narrower range of the leaf economic spectrum. Standardization of the light environments in which LMA is measured is vital in comparative studies of humid temperate forest evergreens, because of countergradient responses of this trait to light, and because of the relative magnitudes of plastic and interspecific variation in LMA in these forests.
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Jaramillo, Víctor J., Raúl Ahedo-Hernández, and J. Boone Kauffman. "Root biomass and carbon in a tropical evergreen forest of Mexico: changes with secondary succession and forest conversion to pasture." Journal of Tropical Ecology 19, no. 4 (July 2003): 457–64. http://dx.doi.org/10.1017/s0266467403003493.
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Conversion of tropical evergreen forests to crops or pastures results in significant depletions of terrestrial carbon (C) pools. Root biomass and root C pools were quantified in tropical evergreen primary forest, and in secondary forests and pastures of different ages, in the Los Tuxtlas Region, Veracruz, Mexico. Total root biomass to 1-m depth ranged from 19 to 27 Mg ha-1 in primary forest, from 5.5 to 22.5 Mg ha-1 in secondary forests (8-, 20- and 30-y-old), and from 3.1 to 5.4 Mg ha-1 in pastures (12-, 20- and 28-y-old). Large roots (> 20 mm in diameter) were largely absent below 40 cm depth in secondary forests and pastures. Roots in the 0–40 cm soil depth represented 60–76% of the total root biomass in primary forest, 77–93% in secondary forests, and 89–96% in pastures. Root biomass comprised 4.7–6.2% of the total biomass in primary forests and between 6.8–8.5% in secondary forests. These low values, the relatively high concentration of roots in the top 40 cm of soil, and the shallow depth at which large roots occurred in secondary forests suggest forest susceptibility to natural disturbances. Root C pools ranged from 7.9 to 11.6 Mg ha-1 in primary forests, from 2.1 to 9.6 Mg ha-1 in secondary forests and from 1.0 to 1.9 Mg ha-1 in pastures. The estimated total ecosystem C pool in primary forest was 415 Mg ha-1, it ranged from 187-246 Mg ha-1 in secondary forests, and was 179 Mg ha-1 in pastures. Tropical forest conversion to pasture decreased the root C pool by nearly 80% and represented a 94% loss of C in ecosystem biomass. Absolute losses of root C were nevertheless small when compared with the above-ground C loss. Carbon distribution among ecosystem biomass components is key to adequately understanding the consequences of land-use/cover change on C dynamics in tropical regions.
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Ashton, P. "WHAT FUTURE FOR ASIA’S LOWLAND TROPICAL EVERGREEN FORESTS?" JOURNAL OF TROPICAL FOREST SCIENCE 30, no. 5 (November 1, 2018): 418–23. http://dx.doi.org/10.26525/jtfs2018.30.5.418423.
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Padalia, H., S. Kumari, S. K. Sinha, S. Nandy, and P. Chauhan. "INTRA- AND INTER-ANNUAL TRENDS OF SUN-INDUCED FLUORESCENCE (SIF) FOR CONTRASTING VEGETATION TYPES OF INDIA." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLIII-B3-2020 (August 21, 2020): 1047–53. http://dx.doi.org/10.5194/isprs-archives-xliii-b3-2020-1047-2020.
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Abstract. The photosynthesis governs productivity and health of the forests. Traditionally, remote sensing derived reflectance measures have been used to assess forest phenology, productivity and stress. The chlorophyll pigments absorb solar radiation, and emit fluorescence in far red region of electromagnetic spectrum. Chlorophyll fluorescence directly relates to the photosynthetic activity of the plants. Measurement of chlorophyll fluorescence from space has recently been achieved in the form of Sun-Induced Fluorescence (SIF). But SIF response have been found variable with respect to variation in vegetation type, hence, there is a need to study SIF response of tropical forests of India considering their wide extent, contribution to national carbon cycle and climate resilience. In this study, intra- and inter-annual GOME-2 and OCO-2 SIF responses of contrasting Indian tropical forest types viz., dry deciduous (Betul, Madhya Pradesh), moist deciduous (Kalahandi, Orissa) and wet evergreen forests (Uttara Kannada, Karnataka) has been investigated with respect to rainfall, NDVI and GPP trends. The results show that dry, moist and wet forests of India have differences in photosynthetic activity at intra- and inter-annual scale. GOME-2 SIF observations were more variables than OCO-2 SIF, particularly during green-up and senescence phase. SIF explained higher seasonality for dry deciduous followed by moist deciduous and wet evergreen. Annually integrated SIF (proxy of GPP) was in order: wet evergreen > moist deciduous > dry deciduous.
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Ortiz-Reyes, Alma D., José R. Valdez-Lazalde, Gregorio Ángeles-Pérez, Héctor M. de los Santos-Posadas, Laura Schneider, Carlos Arturo Aguirre-Salado, and Alicia Peduzzi. "Synergy of Landsat, climate and LiDAR data for aboveground biomass mapping in medium-stature tropical forests of the Yucatan Peninsula, Mexico." Revista Chapingo Serie Ciencias Forestales y del Ambiente 27, no. 3 (August 31, 2021): 383–400. http://dx.doi.org/10.5154/r.rchscfa.2020.08.050.
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Introduction: Tropical forests represent complex and dynamic ecosystems that cover extensive areas, hence the importance of determining biomass content and representing spatial variability. Objective: Estimating and mapping aboveground biomass and its associated uncertainty for medium-stature semi-evergreen (SMSP) and semi-deciduous (SMSC) tropical forests of the Yucatan Peninsula. Materials and methods: Aboveground biomass was estimated as a function of explanatory variables taken from Landsat images and climatic variables, using the random Forest algorithm. Aboveground biomass was mapped from previous biomass estimates for stripes of the territory with the presence of LiDAR (Light Detection And Ranging) and field data. Uncertainty at the pixel level was estimated as the coefficient of variation. Results and discussion: A combination of climatic and spectral variables showed acceptable capacity to estimate biomass in the medium-stature semi-evergreen and semi-deciduous tropical forest with an explained variance of 50 % and RMSE (root mean squared error) of 34.2 Mg·ha -1 and 26.2 Mg·ha -1 , respectively, prevailing climate variables. SMSP biomass ranged from 4.0 to 185.7 Mg·ha -1 and SMSC ranged from 11.7 to 117 Mg·ha -1 . The lowest values of uncertainty were recorded for the medium-stature semi-evergreen tropical forest, being higher in areas with lower amounts of aboveground biomass. Conclusion: Aboveground biomass was estimated and mapped by the combined use of auxiliary variables with an acceptable accuracy, against uncertainty of predictions, which represents an opportunity for future improvement.
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Suryanarayanan, T. S., T. S. Murali, and G. Venkatesan. "Occurrence and distribution of fungal endophytes in tropical forests across a rainfall gradient." Canadian Journal of Botany 80, no. 8 (August 1, 2002): 818–26. http://dx.doi.org/10.1139/b02-069.
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Fungal endophytes occur in leaves of angiosperm and gymnosperm trees. The occurrence and distribution of fungal endophytes in the leaves of trees growing in four different types of tropical forests in the Western Ghats were studied. One thousand five hundred leaf segments from five different hosts were screened for each forest type. Endophyte communities of trees of the semi-evergreen forest showed the highest species diversity. More endophyte isolates were recovered during the wet season. Although several genera of endophytes were common for different hosts growing in different forests, the dominant endophyte was different for different forest types. Our results suggest that although tropical trees individually may be endophyte rich, the overall endophyte diversity of the entire plant community is not exceptional.Key words: tropical forests, fungal endophytes, fungal diversity, foliar endophytes.
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Inskipp, Carol, Sanjib Acharya, and Tikaram Giri. "Birds and habitats recorded in the lower Mai Valley Important Bird and Biodiversity Area." Nepalese Journal of Zoology 6, no. 1 (July 18, 2022): 30–47. http://dx.doi.org/10.3126/njz.v6i1.46751.
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A bird survey was carried out in the lower Mai Valley Forests (MVF) Important Bird and Biodiversity Area (IBA) in far eastern Nepal, between 180 m and 2200 m from 01 to 10 March 2022. An assessment was also made of the environmental conditions of forest and river habitats, and type and extent of agriculture. A comparison was made with a March 1981 visit. Observations were noted during a ten-day trek from Ilam (1205 m) up to Hangetham (2200 m) and down to Sukhani (180 m). The large number of 256 bird species was recorded, including one globally threatened and five globally near-threatened species, five restricted-range species, 20 nationally threatened and eight nationally near-threatened species. One new species for Nepal, black-breasted thrush Turdus dissimilis and three rare Nepal species not found in the IBA for at least 20 years, were also recorded. Extensive intact areas of semi-evergreen subtropical and lower temperate mixed broadleaved forests valuable for birds still remain. Tropical forests have been fragmented and mainly replaced by tea and rubber plantations, and also by the spread of agriculture. However, Sukhani still comprises a substantial semi-evergreen broadleaved forest important for birds, although it is highly threatened. Hunting is probably a significant threat to bird species in MVF. Despite loss and degradation of some forests, especially in the tropical zone, MVF still qualify as an IBA. The Mai Khola habitat has been severely damaged by the Mai Khola Hydroelectric Project, which became operational in 2015, resulting in serious declines in river birds. MVF remain outside the existing protected area network. Including MVF in Nepal’s protected area system would ensure conservation of the species-rich semi-evergreen mixed broadleaved tropical and subtropical forests that are currently an important omission. Further bird surveys are recommended at all elevations and in tropical and subtropical forests that have so far not been covered.
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Yang, Jianbo, Youxin Ma, Yang Bai, and Hui Cao. "Temporal variation of tree diversity of main forest vegetation in Xishuangbanna." Sustainable Forestry 4, no. 1 (May 18, 2021): 46. http://dx.doi.org/10.24294/sf.v4i1.1602.
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In order to evaluate the temporal changes in tree diversity of forest vegetation in Xishuangbanna, Yunnan Province, the study collected tree diversity data from four main forest vegetation in the region through a quadrat survey including tropical rainforest (TRF), tropical coniferous forest (COF), tropical lower mountain evergreen broad-leaved forest (TEBF), tropical seasonal moist forest (TSMF). We extracted the distribution of four forest vegetation in the region in four periods of 1992, 2000, 2009, and 2016 in combination with remote sensing images, using simp son Shannon Wiener and scaling species diversity indexes compare to the differences of tree evenness of four forest vegetation and use the scaling ecological diversity index and grey correlation evaluation model to evaluate the temporal changes of forest tree diversity in the region in four periods. The results show that: (1) The proportion of forest area has a trend of decreasing first and then increasing, which is shown by the reduction from 65.5% in 1992 to 53.42% in 2000, to 52.49% in 2009, and then to 54.73% in 2016. However, the tropical rainforest shows a continuous decreasing trend. (2) There are obvious differences in the contributions of the four kinds of forest vegetation to tree diversity. The order of evenness is tropical rainforest > tropical mountain (low mountain) evergreen broad-leaved forest > warm coniferous forest > tropical seasonal humid forest, and the order of richness is tropical rainforest > tropical mountain (low mountain) evergreen broad-leaved forest > tropical seasonal humid forest > warm coniferous forest, The order of contribution to tree diversity in tropical rainforest > tropical mountain (low mountain) evergreen broad-leaved forest > tropical seasonal humid forest > warm tropical coniferous forest. (3) The tree diversity of tropical rainforests and tropical seasonal humid forests showed a continuous decreasing trend. The tree diversity of forest vegetation in Xishuangbanna in four periods was 1992 > 2009 > 2016 > 2000. The above results show that economic activities are an important factor affecting the biodivesity of Xishuangbanna, and the protection of tropical rainforest is of great significance to maintain the biodiversity of the region.
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Baker, Patrick J., Sarayudh Bunyavejchewin, and Andrew P. Robinson. "The impacts of large-scale, low-intensity fires on the forests of continental South-east Asia." International Journal of Wildland Fire 17, no. 6 (2008): 782. http://dx.doi.org/10.1071/wf07147.
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South-east Asia’s tropical forests harbour high levels of species richness and endemism. In continental South-east Asia strong rainfall seasonality driven by the Asian monsoon lead to ground-fires during the dry season in most years. How these fires influence the region’s landscape mosaic of evergreen and deciduous forests and the biodiversity they support is poorly understood. In this paper we report on the impacts of the El Niño–Southern Oscillation-induced 1997–98 fires that burned across much of western Thailand. We compare fire effects in the three common regional forest types – seasonal evergreen (SEG); mixed deciduous (MDF); and deciduous dipterocarp – and use data from a 50-ha study plot to evaluate the impacts of fire on these forests. We found few differences among the forest types. The fires created more large gaps in MDF than the other forest types. The SEG experienced greater fire mortality in the smallest size classes, abundant resprouting, and showed some evidence of lagged mortality among larger trees. The resilience of the SEG to fire and lack of major differences in fire effects among the forest types suggest that infrequent landscape-scale fires may have little effect on biodiversity in the landscape mosaic of seasonal tropical forests of continental South-east Asia.
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Tokuchi, Naoko, Asami Nakanishi, Chongrak Wachirinrat, and Hiroshi Takeda. "Soil N Fluxes in Three Contrasting Dry Tropical Forests." Scientific World JOURNAL 1 (2001): 534–38. http://dx.doi.org/10.1100/tsw.2001.383.
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A comparative study of N fluxes in soil among a dry dipterocarp forest (DDF), a dry evergreen forest (DEF), and a hill evergreen forest (HEF) in Thailand was done. N fluxes in soil were estimated using an ion exchange resin core method and a buried bag method. Soil C and N pools were 38 C Mg/ha/30 cm and 2.5 N Mg/ha/30 cm in DDF, 82 C Mg/ha/30 cm and 6.2 N Mg/ha/30 cm in DEF, and 167 C Mg/ha/30 cm and 9.3 N Mg/ha/30 cm in HEF. Low C concentration in the DDF and DEF sites was compensated by high fine soil content. In the highly weathered tropical soil, fine soil content seemed to be important for C accumulation. Temporal and vertical fluctuations of N fluxes were different among the sites. The highest N flux was exhibited at the onset of the wet season in DDF, whereas inorganic N production and estimated uptake of N were relatively stable during the wet season in DEF and HEF. It is suggested that N cycling in soil becomes stable in dry tropical forests to intermediate in temperate forests. N deposition may result in large changes of N cycling in the DDF and DEF due to low accumulations of C and N.
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Murali, K. S., D. M. Bhat, and N. H. Ravindranath. "Biomass estimation equations for tropical deciduous and evergreen forests." International Journal of Agricultural Resources, Governance and Ecology 4, no. 1 (2005): 81. http://dx.doi.org/10.1504/ijarge.2005.006440.
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Loranger, G., J. F. Ponge, and P. Lavelle. "Humus forms in two secondary semi-evergreen tropical forests." European Journal of Soil Science 54, no. 1 (February 21, 2003): 17–24. http://dx.doi.org/10.1046/j.1365-2389.2003.00500.x.
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Pascal, J. P. "Floristic composition and distribution of evergreen forests in the Western Ghats, India." Journal of Palaeosciences 39, no. (1-3) (December 31, 1990): 110–26. http://dx.doi.org/10.54991/jop.1990.1685.
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After an analysis of the three main climatic gradients governing the Western Ghats region, relationships are established between the climate and the distribution of the evergreen forest types. Some cases of distribution linked to soil are also discussed. The second part deals with the distribution of species in the different evergreen forest types with particular reference to their relative importance and the relative importance of the families. Figures of species richness are compared with results obtained in other tropical rain forests, and areas with high percentage of endemism are considered. The distribution of the species within the forest ecosystem is then studied: distribution in the structural ensembles, relative density and species diversity.
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Tuan, Nguyen Thanh, Diego I. Rodríguez-Hernández, Vu Cong Tuan, Nguyen Van Quy, Maxwell C. Obiakara, and Joshua Hufton. "Effects of tree diversity and stand structure on above-ground carbon storage in evergreen broad-leaved and deciduous forests in Southeast Vietnam." Dendrobiology 88 (September 2, 2022): 38–55. http://dx.doi.org/10.12657/denbio.088.003.
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Understanding the relationship between tree species diversity and above-ground carbon (AGC) storage in tropical forests is essential for a sustainable flow of ecosystem goods and services. Although tropical forests of Vietnam are of particular interest due to their high biodiversity and carbon density, few studies have evaluated the relative importance of species composition, tree species diversity and forest structure on AGC storage by forest vegetation type. In this study, we tested for the influence of taxonomic diversity, forest structure and species composition on AGC storage in evergreen broad-leaved and deciduous forests of Southeast Vietnam. Data was collected within 137 rectangular plots (25 m × 20 m), randomly selected across a deciduous forest (DF) and four evergreen broad-leaved forest (EB) categories, with different standing volumes levels: very poor (EBG), poor (EBP), medium (EBM) and rich (EBR). In total, we identified 3687 individuals from 110 tree species belonging to 46 families in 6.85 hectares of sampled area. AGC storage significantly differed among forest categories, ranging from 14.81 Mg ha−1 in EBG to 146.74 Mg ha−1 in EBR. There was higher AGC in the medium diameter class (20-40 cm), except for EBR where there was higher AGC within individuals of 40-60 cm in diameter. Taxonomic diversity was weakly correlated with AGC while stand structure (stem density and maximum diameter) were strongly correlated. Our results suggest that maintaining the abundance distributions of remnant tree species, particularly that of large trees, is one important method to enhance AGC storage in the tropical ecosytems of southern Vietnam.
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Yang, Yingying, Taixia Wu, Yuhui Zeng, and Shudong Wang. "An Adaptive-Parameter Pixel Unmixing Method for Mapping Evergreen Forest Fractions Based on Time-Series NDVI: A Case Study of Southern China." Remote Sensing 13, no. 22 (November 19, 2021): 4678. http://dx.doi.org/10.3390/rs13224678.
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Spectral unmixing remains the most popular method for estimating the composition of mixed pixels. However, the spectral-based unmixing method cannot easily distinguish vegetation with similar spectral characteristics (e.g., different forest tree species). Furthermore, in large areas with significant heterogeneity, extracting a large number of pure endmember samples is challenging. Here, we implement a fractional evergreen forest cover-self-adaptive parameter (FEVC-SAP) approach to measure FEVC at the regional scale from continuous intra-year time-series normalized difference vegetation index (NDVI) values derived from moderate resolution imaging spectroradiometer (MODIS) imagery acquired over southern China, an area with a complex mixture of temperate, subtropical, and tropical climates containing evergreen and deciduous forests. Considering the cover of evergreen forest as a fraction of total forest (evergreen forest plus non-evergreen forest), the dimidiate pixel model combined with an index of evergreen forest phenological characteristics (NDVIann-min: intra-annual minimum NDVI value) was used to distinguish between evergreen and non-evergreen forests within a pixel. Due to spatial heterogeneity, the optimal model parameters differ among regions. By dividing the study area into grids, our method converts image spectral information into gray level information and uses the Otsu threshold segmentation method to simulate the appropriate parameters for each grid for adaptive acquisition of FEVC parameters. Mapping accuracy was assessed at the pixel and sub-pixel scales. At the pixel scale, a confusion matrix was constructed with higher overall accuracy (87.5%) of evergreen forest classification than existing land cover products, including GLC 30 and MOD12. At the sub-pixel scale, a strong linear correlation was found between the cover fraction predicted by our method and the reference cover fraction obtained from GF-1 images (R2 = 0.86). Compared to other methods, the FEVC-SAP had a lower estimation deviation (root mean square error = 8.6%). Moreover, the proposed method had greater estimation accuracy in densely than sparsely forested areas. Our results highlight the utility of the adaptive-parameter linear unmixing model for quantitative evaluation of the coverage of evergreen forest and other vegetation types at large scales.
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Khare, E. G., Mahesh Prasad, and N. Awasthi. "Contributions to the deccan intertrappean flora of Nawargaon, Wardha District, Maharashtra, India." Journal of Palaeosciences 49, no. (1-3) (December 31, 2000): 443–60. http://dx.doi.org/10.54991/jop.2000.159.
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Eight fossil wood species are described from the Deccan Intertrappean beds of Nawargaon, Wardha District, Maharashtra. India. The fossil flora, so far, recovered from the Nawargaon area indicates that tropical evergreen forests with some moist deciduous plants were nourishing around Nawargaon area in Central India during Early Tertiary in contrast to mixed deciduous type of present day forest. The habit and habitat of the modem comparable taxa suggest prevalence of tropical humid climate in the area during Early-Tertiary.
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Ichie, Tomoaki, Toru Hiromi, Reiji Yoneda, Koichi Kamiya, Masao Kohira, Ikuo Ninomiya, and Kazuhiko Ogino. "Short-term drought causes synchronous leaf shedding and flushing in a lowland mixed dipterocarp forest, Sarawak, Malaysia." Journal of Tropical Ecology 20, no. 6 (October 14, 2004): 697–700. http://dx.doi.org/10.1017/s0266467404001713.
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Tropical rain forests are evergreen and experience a climate suitable for plant growth year round (Whitmore 1998). However, most tropical rain-forest trees display periodic shoot growth (Borchert 1991) and show synchronous leaf flushing at the community level (Itioka & Yamauti in press, Medway 1972, Ng 1981). Synchronous leaf flushing may have a great impact on animal population such as herbivores, because young leaves are suitable food resources for many herbivores (Aide 1988, 1992; Coley 1983, Itioka & Yamauti 2004, Lowman 1985).
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Richard, P. Selva, and K. Sudha. "Deposition Pattern of Pollen and Spores on the Moss Cushions of Tropical Dry Evergreen Forest (Madras Christian College Campus), Chennai." Indian Journal of Forestry 35, no. 2 (June 1, 2012): 207–12. http://dx.doi.org/10.54207/bsmps1000-2012-b4je0i.
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Studies on the pollen and spore deposition pattern in the moss cushion is one of the important parameters in the assessment of aerospora of a particular region. The samples of moss cushions were collected from various parts of the tropical dry evergreen forests of Madras Christian College, Chennai, between December 2007 and February 2008. The pollen and spore analysed from moss cushions samples revealed a total of 17 pollen types of Tropical Dry Evergreen forest taxa and fungal spores such as Alternaria, Curvularia, etc. In this study, the concentration of modern pollen taxa is dominant than the fungal spores during the month of January and February when compared to sample analysed during December. This data signifies the relationship between the pollen and spore deposition pattern during this period of the year.
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Anusree, Ajithakumari, Puthiya Karunakaran, and Narayanaswamy Parthasarathy. "Effect of Adult Tree Density and Nearness to the Natural Forest on the Restoration of Degraded Deciduous Forests of Attappady, Western Ghats, Kerala." Indian Journal of Forestry 39, no. 4 (January 12, 2016): 309–15. http://dx.doi.org/10.54207/bsmps1000-2016-362f4c.
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Studied on the effect of adult tree density and the proximity to the natural forest on restoration success in one of the most exploited tropical deciduous forests, Attappady, Western Ghats. Random quadrats were laid and surveyed for trees and saplings in remnant tropical deciduous forest patches (hereafter called as fragmented forest and the sites being restored here after called as restoration patches) to determine floristic composition, species turnover among sites and the influence of adult tree density on sapling density. Forests composed of deciduous and evergreen trees with an average species richness of 28 and alpha diversity of 2.671 in a 0.2 ha plot. Similarity of restoration patches with natural forest increased as distance between them decreased and regeneration of native species were more efficient in sites with more number of adult trees. Local (adult tree density) and landscape level (isolation of patches) factors are both important in determining the restoration success of deciduous forests of Attappady.
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Alok, Alok, MAHESH PRASAD, SHASHI SHASHI, and Shivendra mohan Pandey. "Fossil Species of Lagerstroemia and Millettia from Miocene Strata of the Sarkaghat Region in the Sub-Himalayan Zone of Himachal Pradesh, India, and their Palaeobotanical Inferences." INTERNATIONAL JOURNAL OF PLANT AND ENVIRONMENT 9, no. 01 (August 8, 2023): 49–56. http://dx.doi.org/10.18811/ijpen.v9i01.08.
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Palaeobotanical investigations were conducted on plant macrofossils obtained from the Middle Siwalik sediments of Sarkaghat, Mandi District, Himachal Pradesh, India as part of this current communication. This study discovered the existence of two previously unknownfossil species that correspond to the taxa that are now living, Lagerstroemia Linn. and Millettia Wight & Arn. of the families Lythraceae and Fabaceae, respectively. These modern comparable taxa of the macrofossils reported here are distributed in the tropical evergreen tomoist deciduous forests of the south-east Asian region which may suggest that tropical forests under moist conditions were prevalent during the Upper Miocene times in this region in contrast to mixed deciduous forest under the reduced precipitation at present. It alsoindicates the prevalence of a humid tropical climate during the Miocene in the Sarkaghat area.
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Lu, Xinghui, Runguo Zang, Yue Xu, Shouchao Yu, and Hongxia Zhao. "Effects of Above- and Below-Ground Interactions of Plants on Growth of Tree Seedlings in Low-Elevation Tropical Rainforests on Hainan Island, China." Forests 12, no. 7 (July 12, 2021): 905. http://dx.doi.org/10.3390/f12070905.
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Understanding the effects of above- and below-ground interactions on seedling growth is pivotal for identifying the key drivers of secondary forest succession. However, it is still unclear whether the effects of above- and below-ground interactions of plants are consistent for seedling growth of deciduous and evergreen species. There are two types of broadleaved forests (i.e., tropical lowland rainforest and tropical deciduous monsoon rainforest) in the low-elevation (<800 m) areas of Hainan Island in China. Here, 32 seedling transplanting plots (1 × 1 m2) were established in the tropical lowland rainforest and the tropical deciduous monsoon rainforest, respectively. Four treatments (each with 16 replicates) were carried out to reduce above- and below-ground interactions of plants in the low-elevation forests: removal of vegetation (R), root trenching (T), removal of vegetation and root trenching (R + T), and no vegetation removal or trenching (as the control) (C). Seedlings of four deciduous species and four evergreen species were planted to observe their performance in the experiments. The relative growth rates (RGR) of the seedlings were measured to distinguish the relative effects of above- and below-ground interactions. The photosynthetically active radiation (PAR) was measured as a proxy for above-ground interaction and the root biomass was used as a proxy for below-ground interaction. The relationships between seedling RGR and PAR/root biomass were examined. Results showed that: (1) R and R+T treatments significantly increased the seedlings RGR, but T treatment had no effect on the RGR; (2) the growth rates of deciduous species were greater than those of the evergreen species; and (3) seedling growth rates were increased with more PAR. Our study suggests that above-ground vegetation removal had a stronger effect than trenching on the growth and assembly of tree seedlings in the low-elevation tropical rainforests.
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De Weirdt, M., H. Verbeeck, F. Maignan, P. Peylin, B. Poulter, D. Bonal, P. Ciais, and K. Steppe. "Seasonal leaf dynamics for tropical evergreen forests in a process based global ecosystem model." Geoscientific Model Development Discussions 5, no. 1 (February 24, 2012): 639–81. http://dx.doi.org/10.5194/gmdd-5-639-2012.
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Abstract. The influence of seasonal phenology in tropical humid forests on canopy photosynthesis remains poorly understood and its representation in global vegetation models highly simplified, typically with no seasonal variability of canopy leaf area properties taken into account. However, recent flux tower and remote sensing studies suggest that seasonal phenology in tropical rainforests exerts a large influence over carbon and water fluxes, with feedbacks that can significantly influence climate dynamics. A more realistic description of the underlying mechanisms that drive seasonal tropical forest photosynthesis and phenology could improve the correspondence of global vegetation model outputs with the wet-dry season biogeochemical patterns measured at flux tower sites. Here, we introduce a leaf Net Primary Production (NPP) based canopy dynamics scheme for evergreen tropical forests in the global terrestrial ecosystem model ORCHIDEE and validated the new scheme against in-situ carbon flux measurements. Modelled Gross Primary Productivity (GPP) patterns are analyzed in details for a flux tower site in French Guiana, in a forest where the dry season is short and where the vegetation is considered to have developed adaptive mechanisms against drought stress. By including leaf litterfall seasonality and a coincident light driven leaf flush and seasonal change in photosynthetic capacity in ORCHIDEE, modelled carbon and water fluxes more accurately represent the observations. The fit to GPP flux data was substantially improved and the results confirmed that by modifying canopy dynamics to benefit from increased light conditions, a better representation of the seasonal carbon flux patterns was made.
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Tynsong, H., M. Dkhar, and B. K. Tiwari. "Domestication, Conservation, and Livelihoods: A Case Study of Piper peepuloides Roxb.—An Important Nontimber Forest Product in South Meghalaya, Northeast India." International Journal of Biodiversity 2013 (March 27, 2013): 1–7. http://dx.doi.org/10.1155/2013/987914.
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Wild pepper (Piper peepuloides Roxb., family: Piperaceae) is an evergreen climber which grows wild in tropical evergreen forests and subtropical evergreen forests of northeast India. This plant grows luxuriantly in the areas with high rainfall at lower elevations ranging from 100 to 800 m above mean sea level. In Meghalaya, to meet the market demand, farmers have domesticated it in arecanut agroforests and betel leaf agroforests. We found that the mean density of wild pepper in arecanut agroforest is 585 stem/ha and only 85 stem/ha in natural forest. In India, wild pepper is used in a variety of Ayurvedic medicines. Local people of Meghalaya uses powdered dry seeds mixed with honey and egg yolk for the treatment of severe cough. The study reveals that the average gross annual production of wild pepper is 7 quintals/ha, and final market price fetches Rs. 336,000/ha, out of which 42% of the money goes to the grower, 16% to local trader, 23% to dealer, 17% to retailer, 1.2% to wages of labourers, and 0.6% to transport.
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Adhikari, Purushottam, Dhan Bahadur Khatri, Gaurav Srivastava, and Khum N. Paudayal. "Leaf Impression of Amesoneuron (Arecaceae) from the Lower Siwalik Sediments of the Kankai Mai River Section, Eastern Nepal." BMC Journal of Scientific Research 5, no. 1 (December 31, 2022): 60–68. http://dx.doi.org/10.3126/bmcjsr.v5i1.50675.
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A leaf impression of Amesoneuron (Arecaceae) is reported from the Lower Siwalik sediments of the Kankai Mai River section, eastern Nepal. The overall habit, habitat and modern distributions and climatic conditions show the existence of tropical to sub-tropical wet evergreen forests with humid swampy lowland areas during the deposition of the sediments.
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Sathish, B. N., Syam Viswanath, C. G. Kushalappa, M. R. Jagadish, and K. N. Ganeshaiah. "Comparative assessment of floristic structure, diversity and regeneration status of tropical rain forests of Western Ghats of Karnataka, India." Journal of Applied and Natural Science 5, no. 1 (June 1, 2013): 157–64. http://dx.doi.org/10.31018/jans.v5i1.300.
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Tropical forests are one of the richest landscapes in terms of its richness, diversity and endemicity. The present study was carried out in the Central Western Ghats: one of the hottest hotspot of biodiversity. The aim of the study was to compare floristic diversity in tropical wet evergreen forest between northern and southern parts of Western Ghats of Karnataka. Kodagu district in southern part and Uttara Kannada district in northern part was chosen to assess the same, as these two districts cover highest forest cover in the Western Ghats of Karnataka. In each district all the evergreen forests were sampled with 1000 m X 5 belt transacts. Totally 22 such samplings were done both southern and northern part of Western Ghats. In each of these transacts all the trees measuring e” 30 gbh were enumerated and botanically identified to the species level and the same was used for computation of diversity indices. The richness and diversity was comparatively higher in southern part compared to northern part of Western Ghats, where as the richness of threatened tree species was comparatively higher in northern part of Western Ghats. In addition to the species richness and diversity, the paper also deals with the dominant tree species and families in both the region.
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PLANT, ADRIAN R., DANIEL J. BICKEL, PAUL CHATELAIN, CHRISTOPHE DAUGERON, and WICHAI SRISUKA. "Composition and organization of highly speciose Empidoidea (Diptera) communities in tropical montane forests of northern Thailand." Zootaxa 4590, no. 1 (April 24, 2019): 1. http://dx.doi.org/10.11646/zootaxa.4590.1.1.
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This study is based on more than 25,000 specimens of the superfamily Empidoidea (Diptera) collected throughout a full year on a 2000 m elevational habitat succession gradient along a 21 km transect on Doi Inthanon, the highest mountain in Thailand. The samples were sorted to 58 genera and 458 morphospecies (Empididae, 73; Hybotidae, 203; Dolichopodidae, 179; Brachystomatidae, 3). The data were used to prepare the first thorough taxon-focussed description of how diversity of a major group of Diptera is structured in tropical forest biotopes. We found significant spatial (elevation / habitat) and temporal (seasonal) variations in richness (α-diversity) and abundance at family-level. α-Diversity of the four families was maximal in damp evergreen forests at higher elevation (1500–2500 m), but Dolichopodidae also had a major subsidiary peak in lowland dry evergreen forest at 500–1000 m. Genus-, tribe- and subfamily level α-diversity / elevation profiles were varied, indicating that overall family-level richness is a composite of many taxa that contribute low, high or mid-elevation specialisms. We provide a detailed analysis of these specialisms for each of the 58 genera. Adult phenology was correlated with the monsoon and had three characteristic phases: (i) pre-monsoon commencement during the latter part of the hot dry season, (ii) a ‘flush’ of maximal richness during the early-monsoon, and (iii) a secondary richness maximum associated with the late-monsoon. Maximum α-diversity occurred in phases (i) and (ii) but communities in phase (iii) had characteristically low evenness in which a few abundant species were dominant. Cluster analysis and ordination resolved three well-founded communities with different species-abundance distributions, high levels of species-level specialism and habitat-fidelity associated with moist hill evergreen forest (MHE) at >2000 m; mid elevation evergreen forests (EM) at 1000–2000 m and dry lowland forest (DL) at <1000 m. The three forest types with which these communities are associated are widespread and typical of northern Thailand and the diversity characteristics of each habitat are likely scalable to larger geographic areas. The transition from lowland DL through to upper montane MHE communities was generally characterised by increasing abundance, lower evenness (higher dominance), slower temporal turnover of community composition (relaxation of seasonality), longer periods of adult flight activity and rare species contributing less to species richness. Oriental biogeographic influences are strong at lower elevations but Palaearctic influences are increasingly important at higher elevations. The mixing of Oriental and Palaearctic elements in MHE forests is thought to explain the greater phylogenetic complexity at higher elevation (as measured by taxonomic distinctness).
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Baker, Timothy R., David F. R. P. Burslem, and Michael D. Swaine. "Associations between tree growth, soil fertility and water availability at local and regional scales in Ghanaian tropical rain forest." Journal of Tropical Ecology 19, no. 2 (February 6, 2003): 109–25. http://dx.doi.org/10.1017/s0266467403003146.
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Relating patterns of species abundance to the processes that determine them at local and regional spatial scales is one of the central aims of ecological research. To examine the relationship between distribution and growth in tropical rain forest, seasonal and annual changes in tree diameter of two tree species with contrasting distribution patterns, Celtis mildbraedii and Strombosia glaucescens, were monitored across topographic gradients in moist semi-deciduous and moist evergreen forest in Ghana over 2 years, 1997-9. Concurrent measurements were made of soil water availability, and during 1997/8, of rainfall, nutrient availability and photosynthetically active radiation (PAR). The two sites received similar, low, total rainfall during 1997/8, but soil water availability in the dry season at the evergreen site exceeded that at the semi-deciduous forest site. Soil water availability was higher during 1998/9 at both sites. During 1997/8, PAR was similar at the two sites. The evergreen site had soils of lower pH, available P, Mg, Ca and K concentrations than the semi-deciduous forest site. Water availability and the sand content of the soil increased and concentrations of total N and C decreased, from summit to valley positions at both sites. Celtis mildbraedii had significantly faster growth rates than S. glaucescens, and growth of both species was greater at the semi-deciduous than the evergreen forest site during the wet year (1998/9) but not during the dry year (1997/8). Celtis mildbraedii in semi-deciduous forest grew less in valley than summit and slope positions. We conclude that in the absence of a severe dry season, growth is higher in semi-deciduous than evergreen forest, and is related to the higher soil fertility in more seasonal forest. The patterns are consistent with the hypothesis that concentrations of available P and/or cations in the soil limit growth in evergreen forest, while concentrations of N in valley soils limit growth of C. mildbraedii in semi-deciduous forest. There was no evidence that variation in PAR influenced growth rates in these forests. A reduction in growth rate on less fertile soils may be a factor determining the distribution limit of dry forest species, such as C. mildbraedii, in evergreen forest.
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Liu, Liyang, Xueqin Yang, Fanxi Gong, Yongxian Su, Guangqing Huang, and Xiuzhi Chen. "The Novel Microwave Temperature Vegetation Drought Index (MTVDI) Captures Canopy Seasonality across Amazonian Tropical Evergreen Forests." Remote Sensing 13, no. 3 (January 20, 2021): 339. http://dx.doi.org/10.3390/rs13030339.
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Despite its perennial canopy, the Amazonian tropical evergreen forest shows significant canopy growth seasonality, which has been represented by optical satellite-based observations. In this paper, a new Microwave Temperature–Vegetation Drought Index (MTVDI) based on Advanced Microwave Scanning Radiometer for the Earth Observing System (AMSR-E) sensors was used to capture the canopy seasonality from 2003 to 2010 in comparison with four climatic dryness indicators (Palmer Drought Severity Index (PDSI), Climatological Water Deficit (CWD), Terrestrial Water Storage (TWS), Vapor Pressure Deficit (VPD)) and two photosynthesis proxies (Enhanced Vegetation Index (EVI) and Solar-Induced chlorophyll Fluorescence (SIF)), respectively. Our results suggest that the MTVDI shows opposite seasonal variability with two photosynthesis proxies and performs better than the four climatic dryness indicators in reflecting the canopy photosynthesis seasonality of tropical forests in the Amazon. Besides, the MTVDI captures wet regions that show green-up during the dry season with mean annual precipitation higher than 2000 mm per year. The MTVDI provides a new way for monitoring the canopy seasonality of tropical forests from microwave signals.
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Peres, Carlos A. "Ground fires as agents of mortality in a Central Amazonian forest." Journal of Tropical Ecology 15, no. 4 (July 1999): 535–41. http://dx.doi.org/10.1017/s0266467499000991.
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Although undisturbed tropical evergreen forests are often thought to be fire- resistant ecosystems due to lack of sufficiently dry fuel loads (Bond & van Wilgen 1996, Kauffman et al. 1988, Uhl et al. 1988), this myth is rapidly collapsing with the proliferation of recent forest fires throughout south-east Asia (Kinnard & O'Brien 1998, Leighton & Wirawan 1986), Central America (Anon. 1998a), and northern South America (Anon. 1998b) following unusually severe seasonal droughts.
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Kirkwood, D., and J. J. Midgley. "The floristics of Sand Forest in northern KwaZulu-Natal, South Africa." Bothalia 29, no. 2 (October 1, 1999): 293–304. http://dx.doi.org/10.4102/abc.v29i2.602.
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We use multivariate analyses (ordination and classification) to assess both the floristic uniqueness of the woody vegeation of Sand Forest in relation to a range of other forest types in the region, and the range of variation within Sand Forest. Two broad Sand Forest subtypes and related Ecotonal Forests are described and grouped under the term Tropical Dry Forest, distinct from all evergreen forests in South Africa. Sand Forest, a dry semi-deciduous type in northeastern KwaZulu-Natals defined by the presence of the canopy dominant Cleistanthus schlechteri as well as Hymenocardia ulmoides, Psydrax fragrantissima, Croton pseudopulchellus and Drypetes arguta. Sand Forests form a cohesive group in both DCA and TWINSPAN analyses, with similar composition of canopy dominants at sampled sites. This implies that ecological funcioning is similar across the geographical range in northeastern KwaZulu-Natal. However, turnover of subdominant species between recognisable Sand Forest types emphasizes the need to conserve the full range of extant forests.
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Smith, Richard J., and Francis E. Mayle. "Impact of mid- to late Holocene precipitation changes on vegetation across lowland tropical South America: a paleo-data synthesis." Quaternary Research 89, no. 1 (November 10, 2017): 134–55. http://dx.doi.org/10.1017/qua.2017.89.
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AbstractA multi-proxy paleo-data synthesis of 110 sites is presented, exploring the impact of mid- to late Holocene precipitation changes upon vegetation across Southern Hemisphere tropical South America. We show that the most significant vegetation changes occurred in southwest Amazonia and southeast Brazil, regions reliant on precipitation derived from the South American summer monsoon (SASM). A drier mid-Holocene in these regions, linked to a weaker SASM, favored more open vegetation (savannah/grasslands) than present, while increased late-Holocene precipitation drove expansion of humid forests (e.g., evergreen tropical forest in southwest Amazonia,Araucariaforests in southeast Brazil). The tropical forests of central, western and eastern Amazonia remained largely intact throughout this 6000-year period. Northeastern Brazil’s climate is “antiphased” with the rest of tropical South America, but a lack of paleo-data limits our understanding of how vegetation responded to a wetter (drier) mid-(late) Holocene. From this paleo-data perspective, we conclude that ecotonal forests already close to their climatic thresholds are most vulnerable to predicted future drought, but the forest biome in the core of Amazonia is likely to be more resilient. Of greater concern are widespread deforestation and uncontrolled anthropogenic burning, which will decrease ecosystem resilience, making them more vulnerable than they might be without current anthropogenic pressures.
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Kjelgren, Roger, Yongyut Trisurat, Ladawan Puangchit, Nestor Baguinon, and Puay Tan Yok. "Tropical Street Trees and Climate Uncertainty in Southeast Asia." HortScience 46, no. 2 (February 2011): 167–72. http://dx.doi.org/10.21273/hortsci.46.2.167.
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Urban trees are a critical quality of life element in rapidly growing cities in tropical climates. Tropical trees are found in a wide variety of habitats governed largely by the presence and duration of monsoonal dry periods. Tropical cities can serve as a proxy for climate change impacts of elevated carbon dioxide (CO2), urban heat island, and drought-prone root zones on successful urban trees. Understanding the native habitats of species successful as tropical urban trees can yield insights into the potential climate impact on those habitats. Species from equatorial and montane wet forests where drought stress is not a limiting factor are not used as urban trees in cities with monsoonal dry climates such as Bangkok and Bangalore. Absence of trees from a wet habitat in tropical cities in monsoonal climates is consistent with model and empirical studies suggesting wet evergreen species are vulnerable to projected climates changes such as lower rainfall and increased temperatures. However, monsoonal dry forest species appear to have wider environmental tolerances and are successful urban trees in cities with equatorial wet climates such as Singapore as well as cities with monsoonal climates such as Bangkok and Bangalore. In cities with monsoonal dry climates, deciduous tree species are more common than dry evergreen species. Although dry deciduous species generally have better floral displays, their prevalence may in part be the result of greater tolerance of urban heat islands and drought in cities; this would be consistent with modeled habitat gains at the expense of dry evergreen species in native forest stands under projected higher temperatures from climate change. Ecological models may also point to selection of more heat- and drought-tolerant species for tropical cities under projected climate change.
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Matricardi, Eraldo A. T., David L. Skole, Mark A. Cochrane, Jiaguo Qi, and Walter Chomentowski. "Monitoring Selective Logging in Tropical Evergreen Forests Using Landsat: Multitemporal Regional Analyses in Mato Grosso, Brazil." Earth Interactions 9, no. 24 (November 1, 2005): 1–24. http://dx.doi.org/10.1175/ei142.1.
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Abstract Selective logging degrades tropical forests. Logging operations vary in timing, location, and intensity. Evidence of this land use is rapidly obscured by forest regeneration and ongoing deforestation. A detailed study of selective logging operations was conducted near Sinop, State of Mato Grosso, Brazil, one of the key Amazonian logging centers. An 11-yr series of annual Lansdat images (1992–2002) was used to detect and track logged forests across the landscape. A semiautomated method was applied and compared to both visual interpretation and field data. Although visual detection provided precise delineation of some logged areas, it missed many areas. The semiautomated technique provided the best estimates of logging extent that are largely independent of potential user bias. Multitemporal analyses allowed the authors to analyze the annual variations in logging and deforestation, as well as the interaction between them. It is shown that, because of both rapid regrowth and deforestation, evidence of logging activities often disappeared within 1–3 yr. During the 1992–2002 interval, a total of 11 449 km2 of forest was selectively logged. Around 17% of these logged forests had been deforested by 2002. An intra-annual analysis was also conducted using four images spread over a single year. Nearly 3% of logged forests were rapidly deforested during the year in which logging occurred, indicating that even annual monitoring will underestimate logging extent. Great care will need to be taken when inferring logging rates from observations greater than a year apart because of the partial detection of previous years of logging activity.
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Parthasarathy, N., M. Arthur Selwyn, and M. Udayakumar. "Tropical Dry Evergreen Forests of Peninsular India: Ecology and Conservation Significance." Tropical Conservation Science 1, no. 2 (June 2008): 89–110. http://dx.doi.org/10.1177/194008290800100203.
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Hai, Vo Dai, Tran Van Do, Dang Thinh Trieu, Tamotsu Sato, and Osamu Kozan. "Carbon stocks in tropical evergreen broadleaf forests in Central Highland, Vietnam." International Forestry Review 17, no. 1 (March 1, 2015): 20–29. http://dx.doi.org/10.1505/146554815814725086.
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Cochrane, Mark A. "Synergistic Interactions between Habitat Fragmentation and Fire in Evergreen Tropical Forests." Conservation Biology 15, no. 6 (December 14, 2001): 1515–21. http://dx.doi.org/10.1046/j.1523-1739.2001.01091.x.
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Parthasarathy, N., S. Muthuramkumar, and M. Sridhar Reddy. "Patterns of liana diversity in tropical evergreen forests of peninsular India." Forest Ecology and Management 190, no. 1 (March 2004): 15–31. http://dx.doi.org/10.1016/j.foreco.2003.10.003.
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Nguyen, Huong Thi Thanh. "MAPPING TROPICAL FOREST FOR SUSTAINABLE MANAGEMENT USING SPOT 5 SATELLITE IMAGE." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLI-B7 (June 21, 2016): 319–23. http://dx.doi.org/10.5194/isprs-archives-xli-b7-319-2016.
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This paper describes the combination of multi-data in stratifying the natural evergreen broadleaved tropical forest of the Central Highlands of Vietnam. The forests were stratified using both unsupervised and supervised classification methods based on SPOT5 and field data. The forests were classified into 3 and 4 strata separably. Correlation between stratified forest classes and forest variables was analyzed in order to find out 1) how many classes is suitable to stratify for the forest in this area and 2) how closely the forest variables are related with forest classes. The correlation coefficient shows although all forest variables did have a significant correlation with the forest classes, stand volume appeared to have the strongest correlation with forest classes. These are 0.64 and 0.59 for four and three strata respectively. The results of supervised classification also show the four strata of heavily degraded forest, moderate disturbance, insignificant disturbance, and dense forest were discriminated more clearly comparing to the forest stratified into three classes. The proof is that overall accuracy of supervised classification was 86% with Kappa of 0.8 for four classes, meanwhile, these are 77% and 0.62 respectively for forest area classified into 3 classes.
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Nguyen, Huong Thi Thanh. "MAPPING TROPICAL FOREST FOR SUSTAINABLE MANAGEMENT USING SPOT 5 SATELLITE IMAGE." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLI-B7 (June 21, 2016): 319–23. http://dx.doi.org/10.5194/isprsarchives-xli-b7-319-2016.
Full textAbstract:
This paper describes the combination of multi-data in stratifying the natural evergreen broadleaved tropical forest of the Central Highlands of Vietnam. The forests were stratified using both unsupervised and supervised classification methods based on SPOT5 and field data. The forests were classified into 3 and 4 strata separably. Correlation between stratified forest classes and forest variables was analyzed in order to find out 1) how many classes is suitable to stratify for the forest in this area and 2) how closely the forest variables are related with forest classes. The correlation coefficient shows although all forest variables did have a significant correlation with the forest classes, stand volume appeared to have the strongest correlation with forest classes. These are 0.64 and 0.59 for four and three strata respectively. The results of supervised classification also show the four strata of heavily degraded forest, moderate disturbance, insignificant disturbance, and dense forest were discriminated more clearly comparing to the forest stratified into three classes. The proof is that overall accuracy of supervised classification was 86% with Kappa of 0.8 for four classes, meanwhile, these are 77% and 0.62 respectively for forest area classified into 3 classes.
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Prasad, P., A. Sringeswara, C. Reddy, P. Kumari, R. Varalakshmi, S. Raza, and C. Dutt. "Vegetation structure and ecological characteristics of forest of North Andaman Islands (India)." Biological Letters 46, no. 2 (January 1, 2009): 105–21. http://dx.doi.org/10.2478/v10120-009-0006-0.
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Vegetation structure and ecological characteristics of forest of North Andaman Islands (India)In this study, 3-ha research plots were established, one each in evergreen, semi-evergreen, and moist deciduous forests of North Andaman Islands. These 3 vegetation types were selected to study the structural aspects of plant diversity in forest communities. Our results showed high species richness and basal area in evergreen forest, high diversity in semi-evergreen forest, and high tree density (trees ha-1) in moist deciduous forest. At family level, the Anacardiaceae and Sterculiaceae dominated all the forest types, and were distributed throughout the North Andaman Islands. In the 3 forest communities, most species exhibited clumped spatial distribution, while random distribution ranked second. Tree girth class distribution revealed a decreasing number of trees with increasing girth class, indicating natural regeneration of these forest types. The species-area curve clearly reached a plateau at 3-ha area in respect of species number, supporting the adequacy of the large plot size selected in the present investigation. The study recorded a total of 136 tree species in the 3 forest communities and was higher than in many other tropical forest sites. The vegetation analysis of 3-ha plot in 3 different forest types substantially contributed data on North Andaman site potentiality, with reference to its species richness and diversity.