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Journal articles on the topic 'Alnus nepalensis'

Author: Grafiati

Published: 4 June 2021

Last updated: 18 May 2024

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1

Balami, Sujan, and Lal B. Thapa. "Herbivory damage in native Alnus nepalensis and invasive Ageratina adenophora." Botanica Orientalis: Journal of Plant Science 11 (September 7, 2018): 7–11. http://dx.doi.org/10.3126/botor.v11i0.21026.

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There are numbers of invasive and naturalized alien species in Nepal but studies related to herbivory effects on such species are scarce. An issue of debate is whether invasive alien species get benefited by less herbivory damage in their introduced range. In this study, we investigated the level of herbivory damage in Alnus nepalensis in an area invaded by Ageratina adenophora in Nepal. The damage was compared between invasive A. adenophora and native Alnus nepalensis. Results showed that A. adenophora experienced lower level of leaf damage by herbivores than that of A. nepalensis. This indicated that the invasive A. adenophora might have benefited from reduced herbivory damage behind its successful invasion in Nepalese forest. Further studies are needed to confirm whether controlling of herbivores to lessen the damage in native Alnus nepalensis could enhance its competitive ability against Ageratina adenophora in native vegetation of Nepal.Botanica Orientalis – Journal of Plant Science (2017) 11: 7–11

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2

Gurung, O. K., U. Budathoki, and G. Parajuli. "Effect of Different Substrates on the Production of Ganoderma lucidum (Curt.:Fr.) Karst." Our Nature 10, no. 1 (2013): 191–98. http://dx.doi.org/10.3126/on.v10i1.7781.

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In this study, the effects of various kinds of sawdust and supplements on the yield of Ganoderma lucidum were investigated in artificial cultivation. The sawdust of Alnus nepalensis, Shorea robusta and Dalbergia sisoo and supplements of rice bran , wheat bran, corn flour and gram flour were used as substrates in Ganoderma lucidum cultivation . Sawdust alone was used in control as a substrate media in the cultivation. Significant differences (P< 0.05) were found among varieties of sawdusts and supplements. Similarly significant differences (P<0.05) were found in sawdust with supplements and without supplements in yield and biological efficiency. Dalbergia sisoo sawdust could not give yield in ambient condition; Shorea robusta gave very low yield and biological efficiency. Alnus nepalensis gave good yield and biological efficiency compared to the other sawdust.The highest yield and Biological efficiency were obtained from gram flour compared to the other brans. Alnus nepalensis sawdust supplemented with gram flour showed higher yield among all treatments. Supplementation showed positive role in mycelia growth and yield of mushroom.DOI: http://dx.doi.org/10.3126/on.v10i1.7781

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3

Noshiro, Shuichi, Mitsuo Suzuki, Lajmina Joshi, Hiroshi Ikeda, and Hideaki Ohba. "Ecological wood anatomy of Alnus nepalensis (Betulaceae) throughout Nepal." IAWA Journal 41, no. 3 (2020): 261–77. http://dx.doi.org/10.1163/22941932-bja10013.

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Abstract Variation in the wood structure of Alnus nepalensis D. Don (Betulaceae) in relation to tree size and habitat altitude was studied in four areas of Nepal: Tamur, Rolwaling, Budi Gandaki, and Bajhang-Khaptad. Alnus nepalensis is a pioneer tree distributed in the Himalayas from northern India to southwestern China and grows throughout Nepal in a wide altitudinal range from 200 m in the tropical zone to 3030 m at the upper limit of the temperate zone. Ecological trends in the wood structure of Alnus nepalensis varied between the studied areas, distinct in the Tamur area, but indistinct in other areas, and tended to be detected in areas with specimens from altitudinal ranges of 2000 m. When all the specimens were separated at 1800 m in elevation and analyzed as two altitudinal groups, features of vessel size and distribution and the ratio of solitary vessels had a significant correlation with tree height in both groups, and tall trees tended to have larger, more solitary vessels. Vessel element and fiber lengths did not have any significant trends in the lower group but had a negative correlation with altitude in the upper group along with the reduction of tree height. Thus, vessel size seems to facilitate the height growth of this pioneer tree, and shorter tracheary elements and more vessel multiples seem to be related to the adaptation of smaller trees at higher elevations.

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Mirza, M. Sajjad, Dittmar Hahn, Svetlana V. Dobritsa, and Antoon D. L. Akkermans. "Phylogenetic studies on uncultured Frankia populations in nodules of Datisca cannabina." Canadian Journal of Microbiology 40, no. 4 (1994): 313–18. http://dx.doi.org/10.1139/m94-051.

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Part of the 16S rRNA gene was amplified directly from uncultured endophyte populations within the root nodules of Datisca cannabina and three strains isolated from nodules of Alnus glutinosa (AgKG′84/4), Coriaria nepalensis (Cn3), and D. cannabina (Dc2). Sequence comparison based on 930 nucleotides indicated that the endophyte of D. cannabina nodules belongs to the genus Frankia and is highly related to the endophyte of C. nepalensis root nodules. The relatedness of the endophytes of C. nepalensis and D. cannabina nodules was also reflected by closely related nifH sequences amplified from the nodules. 16S rRNA sequence analysis of the noninfective strains obtained from both D. cannabina (Dc2) and C. nepalensis (Cn3) nodules also revealed the close relationship of these strains to the genus Frankia.Key words: nitrogen fixation, Frankia, 16S rRNA, nifH.

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5

Bisht, Anchal, Vinod Prasad Khanduri, Bhupendra Singh, Manoj Kumar Riyal, Kewat Sanjay Kumar, and Deepa Rawat. "Pollen production, release and dispersion in Himalayan alder (Alnus nepalensis D. Don.): a major aeroallergens taxa." Folia Oecologica 50, no. 2 (2023): 147–58. http://dx.doi.org/10.2478/foecol-2023-0013.

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Abstract Alnus nepalensis is a medium-sized, deciduous tree that occurs in the Indian sub-continent, South America, Hawaii, and China. It is a prolific pioneer species in freshly exposed soil in landslide areas of the western Himalayas and has the potential of fixing nitrogen. A study was conducted to assess the reproductive phenology, pollen production, pollen release, and pollen-mediated gene flow of Alnus nepalensis by considering a patch of trees as a pollen source in the temperate forest of Garhwal Himalaya to develop sustainable management strategies relating to the plantation geometry in seed orchards. Staminate flowers of A. nepalensis are composed of “cymules”. The presence of bifid stigma and protandry condition were the unique features of the species. Flowering in the male phase was initiated in the last week of September and continued till November. Peak shedding of pollen generally proceeds peak receptivity by 1–2 weeks. The time between onset and peak flowering was 2 weeks 4 days and the total average duration of the flowering period was about 24.8 days. Temperature and relative humidity played a major role in pollen release and the maximum pollen release occurred at 29.2 °C at 13.00 hrs of the day. Pollen production per catkin varied significantly among trees. The average pollen grains per tree were 2.20 × 1010. The pollen-ovule ratio suggests that the breeding system of A. nepalensis falls under the class xenogamy. Pollen mediated gene flow revealed that the significant pollen which can cause pollination of A. nepalensis can travel up to 40 m uphill and 80 m in downhill directions. Thus, an isolation strip of 80 m is sufficient to manage the seed orchard of A. nepalensis in the western Himalayan region.

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6

CHAKRABARTI, SAMIRAN, SURAJIT SUR, SOURAV ROY, and SANJAY SARKAR. "Two new genera and two new species of eriophyoid mites (Acari: Eriophyoidea) from North Bengal, India." Zootaxa 4236, no. 1 (2017): 172. http://dx.doi.org/10.11646/zootaxa.4236.1.10.

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Two new genera and two new species of eriophyoid mites viz., Propeaciota genusetosis n. gen. and n. sp. infesting Acer sp. (Aceraceae) and Spinaephyes alnus n. gen. and n. sp. infesting Alnus nepalensis D. Don (Betulaceae) are described in the tribe Tegonotini (Eriophyidae: Phyllocoptinae) from North Bengal, India. Aciota secundum Flechtmann et al.1995 is re-assigned (n. comb.) to Propeaciota. Relationships of the new genera with other eriophyoid genera are discussed.

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7

Bhandari, Shes Kanta, and Himlal Neupane. "Biomass Modeling of Alnus nepalensis D. Don at Juvenile Stage." Crossing the Border: International Journal of Interdisciplinary Studies 2, no. 1 (2014): 47–60. http://dx.doi.org/10.3126/ctbijis.v2i1.10812.

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Juvenile stage plants contribute significant proportion of forest biomass and carbon depending on successional stage. Thus, the juvenile plants play a significant role in forest ecosystem and they cannot be neglected while estimating the total carbon stocks of the forest. Therefore this study was carried out develop juvenile biomass models. We measured diameter at 10 cm above ground level (D), total height (H) and total biomass (W) of Alnus nepalensis juveniles. We used least square regression technique to develop biomass models. The models were estimated using “library(minpack. lm)” in R. The estimated models were evaluated by using numerical fit statistics and graphical analyses. Among 136 different models tested, the model of the form: Wi= β0+β1(D2H) with explanatory variable D2H accounted for the largest proportion of biomass variations (R2adj = 0.97; RMSE = 42.34g; AIC=406.8.7) for individual Alnus nepalensis juveniles, and showed relatively better graphical appearance and biological logic. DOI: http://dx.doi.org/10.3126/ctbijis.v2i1.10812 Crossing the Border: International Journal of Interdisciplinary Studies Vol.2(1) 2014: 47-60

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8

Nyeko, P., G. Edwards-Jones, and R. K. Day. "Honeybee, Apis mellifera (Hymenoptera: Apidae), leaf damage on Alnus species in Uganda: a blessing or curse in agroforestry?" Bulletin of Entomological Research 92, no. 5 (2002): 405–12. http://dx.doi.org/10.1079/ber2002187.

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AbstractIt is a dictum that Apis mellifera Linnaeus is innocuous in agricultural ecosystems. This study provides the first record of A. mellifera as a significant defoliator of Alnus species. Careful field observations coupled with microscopic examination provided convincing evidence implicating A. mellifera as the cause of leaf perforation on Alnus species in Uganda. Apis mellifera was observed foraging selectively on young Alnus leaves and buds in search of a sticky substance, apparently propolis. In so doing, the bee created wounds that enlarged and caused tattering of Alnus leaves as they matured. Biological surveys indicated that the damage was prevalent and occurred widely, particularly on Alnus acuminata Kunth in Uganda. Incidence of the Apis mellifera damage on Alnus acuminata peaked in the dry season, with up to 90% of leaves emerging per shoot per month damaged, and was lowest in the wet months during peak leaf emergence. Apis mellifera leaf damage was consistently higher on Alnus acuminata than A. nepalensis D. Don., on saplings than mature trees, and on sun exposed than shaded leaves. The activity of honeybees may be detrimental to the productivity of Alnus, yet the substance for which the insect forages on Alnus is a resource with potential economic importance.

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9

Brunner, I. L., F. Brunner, and O. K. Miller Jr. "Ectomycorrhizal synthesis with Alaskan Alnus tenuifolia." Canadian Journal of Botany 68, no. 4 (1990): 761–67. http://dx.doi.org/10.1139/b90-101.

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The ability of Alnus tenuifolia to form ectomycorrhizae with potential ectomycorrhizal fungi was investigated. Alnus tenuifolia seedlings raised in growth pouches were inoculated with Frankia to induce nodulation and then with a putative ectomycorrhizal fungus. The fungi used were collected in nearly pure A. tenuifolia stands in Alaska or were found in Alnus nepalensis stands in Nepal. Five species of putative ectomycorrhizal symbionts of alders were tested. Alpova diplophloeus and Paxillus filamentosus formed both mantle and Hartig net. Cortinarius cf. saturninus developed a mantle but no Hartig net. Hebeloma cf. crustuliniforme and Gyrodon lividus developed neither mantle nor Hartig net. This is the first report of synthesis of P. filamentosus and C. cf. saturninus with Alnus. The ectomycorrhizal status of the genus Gyrodon is discussed, since in vitro synthesis has not yet been demonstrated. Synthesis with A. diplophloeus and H. crustuliniforme did not result in ectomycorrhizal formations with nonnodulated alder seedlings.

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10

Pudjiharta, A. "VAPOTRANSPIRASI JENIS POHON Agathis alba, Alnus nepalensis, DAN Castanopsis argentea." Jurnal Penelitian Hutan dan Konservasi Alam 2, no. 5 (2005): 417–22. http://dx.doi.org/10.20886/jphka.2005.2.5.417-422.

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11

Kayang, Highland. "Fungal and bacterial enzyme activities in Alnus nepalensis D. Don." European Journal of Soil Biology 37, no. 3 (2001): 175–80. http://dx.doi.org/10.1016/s1164-5563(01)01082-2.

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12

Phan, Minh Giang, Thi To Chinh Truong, Tong Son Phan, Katsuyoshi Matsunami, and Hideaki Otsuka. "A new diarylheptanoid and a rare dammarane triterpenoid from Alnus nepalensis." Chemistry of Natural Compounds 47, no. 5 (2011): 735–37. http://dx.doi.org/10.1007/s10600-011-0046-7.

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13

Varghese, Rajani, Vineeta Singh Chauhan, and Arvind Kumar Misra. "Evolutionary implications of nucleotide sequence relatedness between Alnus nepalensis and Alnus glutinosa and also between corresponding Frankia microsymbionts." Plant and Soil 254, no. 1 (2003): 219–27. http://dx.doi.org/10.1023/a:1024963215959.

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14

Yadav, D., and M. M. Gupta. "Simultaneous Quantification of Diarylheptanoids in Alnus nepalensis Using a Validated HPTLC Method." Journal of Chromatographic Science 52, no. 8 (2013): 905–10. http://dx.doi.org/10.1093/chromsci/bmt115.

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15

Mejía, Luis C., Amy Y. Rossman, Lisa A. Castlebury, Zhu L. Yang, and James F. White. "Occultocarpon, a new monotypic genus of Gnomoniaceae on Alnus nepalensis from China." Fungal Diversity 52, no. 1 (2011): 99–105. http://dx.doi.org/10.1007/s13225-011-0108-y.

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16

Mir, Zahoor, Nishita Giri, and Pramod Kumar. "Ecological studies of woody species in Chaupal Forest Division of Himachal Pradesh." Indian Journal of Forestry 34, no. 4 (2011): 433–38. http://dx.doi.org/10.54207/bsmps1000-2011-1fpmi5.

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A detailed ecological analysis of woody species of the Chaupal Forest Division, Himachal Pradesh, was carried out at five sites under different altitudes and aspects. The study revealed that the total basal area covers of the forests varied between 0.093 m2/ha (Alnus nepalensis) at Site-IV whereas 46.682 m2/ha at Site-V (Cedrus deodara). The distribution pattern was found regular, random and contagious. Species diversity index was found maximum 1.595 at Site-IV and minimum 0.574 at Site-I whereas species richness was found highest 9 (Site-V) and lowest 2 (Sites -I and II).

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17

Su-Mei, LI, LONG Chun-Lin, and DAO Zhi-Ling. "AN EFFECTIVE WAY TO IMPROVE SOIL FERTILITY IN TRADITIONAL AGROFORESTRY: PLANTING ALNUS NEPALENSIS." Chinese Journal of Plant Ecology 30, no. 5 (2006): 878–86. http://dx.doi.org/10.17521/cjpe.2006.0111.

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18

Yadav, Deepti, Vikas Kushwaha, Kirti Saxena, Richa Verma, P. Kalpana Murthy, and Madan M. Gupta. "Diarylheptanoid compounds from Alnus nepalensis express in vitro and in vivo antifilarial activity." Acta Tropica 128, no. 3 (2013): 509–17. http://dx.doi.org/10.1016/j.actatropica.2013.07.015.

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19

Merino López, Jonathan Alexis, Luis Alfredo Yaguache Ordóñez, and Manuel Guillermo Ruales Segarra. "Ensayos para evaluar la trabajabilidad de la madera de Alnus nepalensis D. Don." Ciencia y Tecnología 16, no. 2 (2023): 25–34. http://dx.doi.org/10.18779/cyt.v16i2.640.

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El estudio se realizó en el Centro de la Madera de la Universidad Nacional de Loja con el objetivo de evaluar la trabajabilidad de la madera de Alnus nepalensis D. Don (aliso) mediante ensayos de cepillado, lijado, taladrado y torneado, de acuerdo a lo establecido en las normas ASTM-D 1999.87 (ASTM, 1999). Las probetas para los ensayos se sometieron a dos condiciones de secado, un programa de secado al aire libre y otro en condiciones controladas en un secador solar. Las probetas fueron secadas durante 90 días y los resultados mostraron qué, el contenido de humedad es significativamente diferente entre los dos programas de secado, resultando de 7.85 % para las probetas del secador solar y 14.12 % para las probetas de secado al aire libre. De acuerdo con la trabajabilidad de la madera, las probetas presentaron grano arrancado y levantado durante el cepillado, en el lijado se obtuvo una superficie lisa sin defectos por rayaduras ni grano velloso, en el taladrado se obtuvieron mejores resultados con la broca para metal y el torneado presentó defectos por grano arrancado dejando una textura con aspereza. Como conclusión podemos decir que no existe diferencia significativa de resultados de trabajabilidad entre las probetas con diferentes contenidos de humedad, probablemente por ser una especie de densidad media (0.46 g.cm3), por lo tanto, es una especie altamente recomendable para la carpintería, ebanistería y estructuras simples.

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20

Gubhaju, Karishma, Dipesh Raj Pant, and Ramesh Prasad Sapkota. "Carbon stock estimation of Shree Rabutar Forest of Gaurishankar Conservation Area, Dolakha, Nepal." Nepal Journal of Environmental Science 6 (December 31, 2018): 61–67. http://dx.doi.org/10.3126/njes.v6i0.30127.

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Forests store significant amount of atmospheric carbon in the form of above and below ground biomass and the amount of carbon stored in forests differs along spatial continuum which provides important information regarding forest quality. This study was carried out to estimate the carbon stock of Shree Rabutar Forest of Gaurishankar Conservation Area, Dolakha, Nepal. In total, 20 circular sampling plots with an area 250 m2 were randomly laid in the study area. Ten tree species were observed in the sampling plots laid in the forest. The higher values of density, frequency, abundance and basal area were observed for Rhododendron arboreum, Alnus nepalensis, Pinus roxburghii and Pinus wallichiana. On the basis of Important Value Index, the dominant tree in the forest was Alnus nepalensis followed by Rhododendron arboreum and Pinus roxburghii. Shannon Index of general diversity of trees in the forest was 0.74 with equal value of Evenness Index, whereas the index of dominance was low (0.22) in the forest. Mean biomass of the forest was 464.01±66.71 tonha-1 contributed by above ground tree biomass (384.44 tonha-1), leaf litter, herbs and grasses biomass (2.69±0.196 tonha-1) and below ground tree biomass (76.88±11.13 tonha-1). Mean carbon stock was 262.77±30.79 tonha-1 including soil carbon stock 44.69±2.25 tonha-1. Individuals of trees with 20-30 cm DBH class were observed in maximum number, which shows that the forest has high potential to sequester carbon over time. Carbon stock estimation and forest management can be one of the potential strategies for climate change mitigation especially through carbon dioxide absorption by the forests.

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Yan, Kai, Michelle Hang Gi Wong, Long Zhang, et al. "Is Phytoextraction Efficient for Remediating Phosphorus-Enriched Soils in Mountainous Region? A Case Study of Lake Dianchi Watershed of Southwestern China." Applied Mechanics and Materials 448-453 (October 2013): 488–93. http://dx.doi.org/10.4028/www.scientific.net/amm.448-453.488.

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Phosphorus leakage from phosphorus-enriched soils (PES) is a major cause of water degradation worldwide, and phytoextraction is known to be an effective method of remediation. However, it is unclear whether phytoextraction is equally efficient in mountainous regions. We investigated the potential of P accumulation of major plant species in the Lake Dianchi Watershed of Southwestern China. Most of the plants living in PES of this region have high P contents; some have been identified as P-hyperaccumulators, such as Polygonum pubescens, which has the highest leaf P content of 16.88 mg/g. Although the dominate species have relatively low P contents than the P-hyperaccumulators, they still have a higher P uptake potential due to their greater biomass, for example, the P uptake potentials of Alnus nepalensis, Coriaria nepalensis, and Erianthus rufipilus are 46.98, 16.91, and 22.78 kg/ha, respectively. While these plants can decrease the total P of rhizospheric soil and topsoil, the effects on the total P-pool was not significant. Our results suggest that just phytoextraction may be less efficient in remediating PES in mountainous regions, and it requires further studies about P cycling and native plants to design more effective measures for P immobilization.

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22

Yadav, Deepti, Subhash Chandra Singh, Ram Kishore Verma, et al. "Antifilarial diarylheptanoids from Alnus nepalensis leaves growing in high altitude areas of Uttarakhand, India." Phytomedicine 20, no. 2 (2013): 124–32. http://dx.doi.org/10.1016/j.phymed.2012.10.017.

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23

Ganesh, G., A. K. Misra, C. Chapelon, and P. Normand. "Morphological and molecular characterization of Frankia sp. isolates from nodules of Alnus nepalensis Don." Archives of Microbiology 161, no. 2 (1994): 152–55. http://dx.doi.org/10.1007/s002030050035.

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Ganesh, G., A. K. Misra, C. Chapelon, and P. Normand. "Morphological and molecular characterization of Frankia sp. isolates from nodules of Alnus nepalensis Don." Archives of Microbiology 161, no. 2 (1994): 152–55. http://dx.doi.org/10.1007/bf00276476.

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25

Mishra, Gaurav, Krishna Giri, and Shaliesh Pandey. "Role of Alnus nepalensis in Restoring Soil Fertility: A Case Study in Mokokchung, Nagaland." National Academy Science Letters 41, no. 5 (2018): 265–68. http://dx.doi.org/10.1007/s40009-018-0668-4.

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26

Liang, Chen, Ling Liu, Zhixiao Zhang, et al. "Do Mixed Pinus yunnanensis Plantations Improve Soil’s Physicochemical Properties and Enzyme Activities?" Diversity 14, no. 3 (2022): 214. http://dx.doi.org/10.3390/d14030214.

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Many survival and ecological problems have emerged in Pinus yunnanensis pure pine forest plantations that are usually assumed to be solved by creating mixed plantations. On this basis, we determined the physicochemical properties and enzyme activities of three soil layers in pure and three types of mixed P. yunnanensis plantation stands (admixed species: Alnus nepalensis, Celtis tetrandra, and Quercus acutissima) in Southwest China. We used one-way ANOVA with Tukey’s test to analyze the effects of plantation type and depth on the soil’s properties and variations among different depths. Principal component analysis combined with cluster analysis was used to evaluate the soil quality of different forest types comprehensively. The results showed that the stand with a mixing proportion of 2:1 of P. yunnanensis and A. nepalensis, C. tetrandra, and Q. acutissima had higher total porosity, moisture content, total nitrogen, available phosphorus, total phosphorus, sucrase, urease, and catalase enzyme activities than other proportions of mixed forest and P. yunnanensis pine pure forest. In general, the mixed P. yunnanensis plantation could improve the soil quality, especially its chemical properties and enzymes. This study provides a basis for creating a mixed-mode of P. yunnanensis and other tree species that can not only improve the economy of forest land but also enhance the ecological value.

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Phan, Minh Giang, Thi To Chinh Truong, Tong Son Phan, Katsuyoshi Matsunami, and Hideaki Otsuka. "Mangiferonic acid, 22-hydroxyhopan-3-one, and physcion as specific chemical markers for Alnus nepalensis." Biochemical Systematics and Ecology 38, no. 5 (2010): 1065–68. http://dx.doi.org/10.1016/j.bse.2010.09.020.

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28

Saxena, Archana, Deepti Yadav, Anil K. Maurya, et al. "Diarylheptanoids from Alnus nepalensis attenuates LPS-induced inflammation in macrophages and endotoxic shock in mice." International Immunopharmacology 30 (January 2016): 129–36. http://dx.doi.org/10.1016/j.intimp.2015.12.002.

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Sharma, U., S. Gupta, and PK Gupta. "ALLOMETRIC MODEL COMPARISON AND COMPONENTS BIOMASS EVALUATION OF ALNUS NEPALENSIS, RHODODENDRON ARBOREUM AND TECTONA GRANDIS." JOURNAL OF TROPICAL FOREST SCIENCE 35, no. 4 (2023): 377–90. http://dx.doi.org/10.26525/jtfs2023.35.4.377.

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30

Wang, XL, GQ Zou, and ZL Cao. "CREATING A CORE COLLECTION OF SUPERIOR ALNUS NEPALENSIS TREES BASED ON PHENOTYPE AND MOLECULAR MARKER DATA." JOURNAL OF TROPICAL FOREST SCIENCE 35, no. 4 (2023): 476–88. http://dx.doi.org/10.26525/jtfs2023.35.4.476.

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Phuntsho, Younten, Lha Tshering, and Dorji Wangdi. "Local Volume Equations and Tables for two Forest Management Units in Bhutan: An Attempt to Provide FMU Specific Estimate of Timber Volume for Sustainable Forest Management." Bhutan Journal of Natural Resources and Development 7, no. 2 (2020): 62–74. http://dx.doi.org/10.17102/cnr.2020.53.

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This study developed tree species specific local volume equations and tables for Lingmethang and Rongmanchu Forest Management Units. The field work was conducted between December, 2019 and January 2020. Data was collected for five species (Schima sp., Ltihocarpus sp., Acrocarpus fraxinifolius, Pinus roxburghii and Castanopsis tribuloides) for Lingmethang FMU and six species (Beilschmedia sp., Persea sp., Quercus sp., Alnus nepalensis, Schima wallichii and Cinnamomum sp.) of trees for Rongmanchu FMU. The height and diameter over bark were measured for every sample trees. Using the height and diameter, volumes for each sample tree was calculated and then the models generated were fitted with a minimum of 32 trees per species, which were destructively felled for the purpose. The models were run in R version 3.4.4. A total of 16 models were fitted and tested for each species. The selected models performed well with small deviation for individual trees.

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Han, Chunyan, Lidan Tao, and Weibang Sun. "Distribution and conservation status of Magnolia ovoidea (Magnoliaceae): a Critically Endangered species in Yunnan, China." Oryx 54, no. 4 (2019): 466–69. http://dx.doi.org/10.1017/s0030605318000704.

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AbstractMagnolia ovoidea is a narrowly endemic, Critically Endangered tree with a fragmented distribution in south-west Yunnan, China. We examined the size structure of this species, documented threats and assessed its extinction risk. We found the species in six locations, all in unprotected areas, in Maguan County. The largest subpopulations are in Donggua Lin and Youfang Po, with 17 and 50 living individuals, respectively. The distribution of the diameter at breast height of the M. ovoidea population has an inverse J-shape, indicating a stable size structure. However, the distribution of the height of seedlings is L-shaped, suggesting inhibited regeneration. The natural vegetation is severely fragmented in all six locations, surrounded by roads, farmlands, and Alnus nepalensis or Cunninghamia lanceolata plantations. We recommend that M. ovoidea should be categorized on the IUCN Red List as Critically Endangered based on criteria B2ab(iii) + C2a(i).

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Liu, N., H. Wang, M. Liu, Q. Gu, W. Zheng, and Y. Huang. "Streptomyces alni sp. nov., a daidzein-producing endophyte isolated from a root of Alnus nepalensis D. Don." INTERNATIONAL JOURNAL OF SYSTEMATIC AND EVOLUTIONARY MICROBIOLOGY 59, no. 2 (2009): 254–58. http://dx.doi.org/10.1099/ijs.0.65769-0.

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Bose, Debadin, Indrani Sarkar, Reha Labar, et al. "Comparative genomics of Prauserella sp. Am3, an actinobacterium isolated from root nodules of Alnus nepalensis in India." Symbiosis 70, no. 1-3 (2016): 49–58. http://dx.doi.org/10.1007/s13199-016-0401-3.

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Sharma, Eklabya, and R. S. Ambasht. "Litterfall, Decomposition and Nutrient Release in an Age Sequence of Alnus Nepalensis Plantation Stands in the Eastern Himalaya." Journal of Ecology 75, no. 4 (1987): 997. http://dx.doi.org/10.2307/2260309.

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Wu, Zuqing, Mengyang Li, Chengjiao Dao, et al. "Responses of Alnus nepalensis seedling under high phosphorus stress: shifts in photosynthesis and phosphorus contents across different organs." IOP Conference Series: Earth and Environmental Science 446 (March 21, 2020): 032025. http://dx.doi.org/10.1088/1755-1315/446/3/032025.

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Gogoi, Sabi. "Study of Some Highly Eroded Wasteland Soils of Cherrapunjee, Meghalaya and Its Bio-Rejuvenation Possibilities." Indian Journal of Forestry 40, no. 3 (2017): 229–33. http://dx.doi.org/10.54207/bsmps1000-2017-fmsd07.

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Cherrapunjee has ragged terrains and deep slopes. Barren rocks without any vegetation cover are dominating feature of the area. Study on soil physico-chemical properties done for re-establishment of vegetation in near future. Soils were shallow, coarse textured, less fertile in terms of available nutrient (N, P, K and Ca, Mg), and are acidic. Soil erosion is severe. Dominant plant species are Saccharum spontanum, Neyraudia reynaudiana, Setaria glauca, Axonopus compressus, and Imperata cylindrica. Some dicotyledonous species such as Trifolium repens, Robustum spp, Schima wallichii, Eugenia sp., Musanda sp. Toona ciliata, Pandanus odoratissimus, Erythrina arborescens, Myrica esculenta, Pinus kesiya, Alnus nepalensis, Exbucklandia populania etc. were observed as natural vegetation in patches. Soil conservation practices such as bench terrace, stone bunding, grassed water ways etc. can be adopted. Soil erosion could be controlled by developing grasses and pasture land. Planting nitrogen fixing herbs and shrubs at the initial stage may be done for buildup of soil nutrient and organic matter. Soil mulching along with the fertilizer treatment may prove effective for initial establishment of plantation.

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Khan, Anindita, David D. Myrold, and Arvind K. Misra. "Distribution of Frankia genotypes occupying Alnus nepalensis nodules with respect to altitude and soil characteristics in the Sikkim Himalayas." Physiologia Plantarum 130, no. 3 (2007): 364–71. http://dx.doi.org/10.1111/j.1399-3054.2006.00872.x.

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He, Haishan, Changtao Gan, Monlin Kuo, Jian Qiu, and Jianrong Wu. "Producing Spalted Alder Wood in Yunnan, China." Forest Products Journal 69, no. 4 (2019): 283–88. http://dx.doi.org/10.13073/fpj-d-18-00045.

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Abstract Given the demand for environmentally friendly wood stains, dyeing by fungi has come to light as a suitable process for staining wood, textiles, and other materials. The identification of fungi capable of producing spalted wood merits considerable effort by researchers, and some spalted color or styles found on wood in the wild cannot be cultivated in the laboratory. To find additional fungal candidates and styles for spalting in China, we here collected and identified wood fungi in Yunnan and Guangxi in China. Fungi were purchased or isolated and then inoculated to alder wood blocks (Alnus nepalensis D. Don). Out of seven purchased strains, three formed zone lines, but it was unclear whether Chlorociboria aeruginascens cfcc 87397 could do so. Out of 20 strains, 15 species were isolated from wood forming zone lines with surface black pigments, and only Diaporthe sp. ZXH63-4 formed additional yellow pigments accompanied by zone lines throughout the wood, which is a new means of forming yellow pigments and black zone lines at the same time. Some fungi collected from stained wood samples showed reddish-brown zone lines, but they showed black zone lines when isolated and inoculated on alder.

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Acharya, Smrita, and Udhab Raj Khadka. "Loss of Tree Biomass in Jure Landslide, Sindhupalchowk, Nepal." Journal of Institute of Science and Technology 21, no. 1 (2016): 65–70. http://dx.doi.org/10.3126/jist.v21i1.16052.

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Landslide causes massive loss of lives and properties along with intangible losses in mountainous regions. Yet such intangible losses in ecosystems are rarely considered. The present study assesses the tree biomass lost due to Jure landslide in Sindhupalchowk that destroyed 71 hectare of land. Altogether, 12 plots (250 m2) were sampled through systematic and purposive sampling technique. The total tree biomass was estimated using allometric equation. The study recorded 21 tree species in which Schimawallichiii (Korth.), Lagerstroemia parviflora (Roxb.), Shorea robusta (Gaertn.), Alnus nepalensis (D. Don), Phyllanthus emblica (Linn.) and Celtius australis (Linn.) were dominant. Schima wallichiii had the highest density (320 individual ha-1) and frequency (92%). The total biomass of tree species was 216 ton ha-1 in which Schima wallichiii constituted the highest total tree biomass (82 ton ha-1). In 71 ha landslide area, the landslide caused loss of 15,336 tons of total tree biomass, which equals to 56,283 tons CO2 equivalents. These findings are relevant for assessing post-landslide impacts on the mountain environment. Furthermore, to reduce carbon emissions resulting from forest loss, mitigation of landslide is crucial.Journal of Institute of Science and TechnologyVol. 21, No. 1, 2016,Page: 65-70

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Kanwar, Kiran, Man K. Dhamala, and Rejina Maskey-Byanju. "Air pollution tolerance index: An approach towards the effective green belt around Kathmandu metropolitan city, Nepal." Nepal Journal of Environmental Science 4 (December 5, 2016): 23–29. http://dx.doi.org/10.3126/njes.v4i0.22721.

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Road vegetation is an effective way to mitigate road generated particulates. Green belts with high Air Pollution Tolerance Index (APTI) value in the urban centers play an important role in the amelioration of the air quality. The APTI of the trees with higher abundance were examined for bio-chemical parameters such as pH, ascorbic acid, total chlorophyll and relative water content. The APTI value of tree species varied from 5.56 (Punica granatum) to 79.99 (Populous deltoids). Higher the APTI value, higher is the tolerance towards air pollution. Among the tree species, Jacaranda mimosifolia, Pinus roxburghi, Ficus benjamin, Celtis australis, Alnus nepalensis, Callistemon lanceolatus, Schima wallichi, Pyrus pyrifolia and Punica granatum were found sensitive, whereas Prunus persia, Populus deltoides, Thuja sp. and Grevillea robusta were found to be the most tolerant species. The green belts constituting higher number of tolerant to moderately tolerant species of trees results in better air pollution sink and air quality refinement. In order to find plants with good APTI, further extensive studies should be carried out and valley plantation program should give priority of those plants having higher APTI value.

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Jing, Y., H. Cui, T. Li, and Z. Zhao. "Heavy metal accumulation characteristics of Nepalese alder (Alnus nepalensis) growing in a lead-zinc spoil heap, Yunnan, south-western China." iForest - Biogeosciences and Forestry 7, no. 4 (2014): 204–8. http://dx.doi.org/10.3832/ifor1082-007.

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Baniya, Amina, Sushma Singh, Minu Singh, et al. "Isolation and Screening of Antibiotics Producing Streptomyces spp from the Soil Collected around the Root of Alnus nepalensis from Godawari." Nepal Journal of Biotechnology 6, no. 1 (2019): 46–56. http://dx.doi.org/10.3126/njb.v6i1.22337.

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Actinomycetes are considered as the most invaluable prokaryotes whose genome mining show a great number of putative secondary metabolite biosynthesis pathways as well as gene clusters ranging from 20 to 50 per genome. The genus Streptomyces has been explored for its ability to produce 60% antibiotics worldwide. Alnus nepalensis (Alder) has been found to harbor diverse Eubacteria in its rhizosphere. To evaluate the antibiotic production potential from Actinomycetes, we collected soil samples from rhizosphere (5-7 cm deep) of Alder tree. Primary screening was done by cross-streak method against Multidrug Resistant (MDR) such as Methicillin resistant Staphylococcus auereus (MRSA), Vancomycin resistant Enterococcus feacalis (VRE), Imepenem resistant Acinetobacterbaumannii, Vancomycin resistant Klebsiella pneumonia and Imepenem resistant E. coli as well as Non-MDRs (E. coli, Bacillus subtilis, Klebsiella pneumoniae, S. aeureu and Enterococcus feacalis). Extraction of antibiotics was done using rota-vapour from extract obtained by solid-substrate fermentation technique followed by solvent extraction. Secondary screening was done using well diffusion assay against MDRs. Among total of 40 isolates of Actinomycetes recovered, 14 showed remarkable zone of inhibition (ZOI) to various MDRs. NASA 303 showed 26 mm of ZOI against VRE, NASA 101 had ZOI of 34 mm against MRSA, NASA 319 had 33.7 mm ZOI against Imepenem resistant E. coli, NASA 306 had 36 mm of ZOI against Vancomycin resistant Klebsiella pneumoniae, and NASA 108 showed ZOI of 29.6 mm against Imepenem resistant E. faecalis. This investigation revealed that the Actinomycetes found in Rhizosphere of Alder tree had MDR killing potent antibiotics, which needs to be further explored.

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Chauhan, V., and A. Misra. "Development of molecular markers for screening of Alnus nepalensis (D. Don) genotypes for the nitrogenase activity of actinorhizal root nodules." Molecular Genetics and Genomics 267, no. 3 (2002): 303–12. http://dx.doi.org/10.1007/s00438-002-0645-x.

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45

Sharma, Eklabya, and R. S. Ambasht. "Root Nodule Age-Class Transition, Production and Decomposition in an Age Sequence of Alnus nepalensis Plantation Stands in the Eastern Himalayas." Journal of Applied Ecology 23, no. 2 (1986): 689. http://dx.doi.org/10.2307/2404046.

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Chettri, Santosh K., Ghanashyam Sharma, Kailash S. Gaira, et al. "Forest Resource Use Pattern in Fringe Villages of Barsey Rhododendron Sanctuary and Singalila National Park of Khangchendzonga Landscape, India." International Journal of Forestry Research 2021 (February 11, 2021): 1–11. http://dx.doi.org/10.1155/2021/8856988.

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Forests in the Barsey-Singalila transboundary area under Khangchendzonga landscape (KL) are facing pressures of resource uses. Despite continuous utilizations, complete data are lacking from the ground level. Socioeconomic, demographic, and forest use data were obtained by interviewing 233 households across two study locations. Forest product market survey was undertaken to determine prices of forest products. Resource dependence index was (0.60) high for both the locations. Alnus nepalensis is highly preferred fuel species with probability of use (0.791), and Rhododendron arboreum with probability of use (0.09) is considered as least preferred species. Relatively bigger village with more population is aggravating utilization pressures. Resource use at Gorkhey-Samanden is low (20% in case of fuelwood) as compared to the use at Ribdi-Bhareng (80% for fuelwood). Only preferred medicinal plants or wild edibles, namely, Yushania maling are collected regardless of their availability for fuelwood and other uses, which is causing more pressure on a small group of plants. A huge shortfall between resource demand and production indicates the possible extraction of resources from surrounding reserve forests. The results provide significant information on peoples dependency on forest resources and may be utilized for developing forest conservation policies for enhanced ecosystem services and livelihoods in the region.

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Li, Gui Xiang, Jin Ping Shao, Xiang Jing Fang, et al. "Study on Heavy Metal Accumulation of Plantsin Gejiu Tin Mining Area." Applied Mechanics and Materials 641-642 (September 2014): 1176–82. http://dx.doi.org/10.4028/www.scientific.net/amm.641-642.1176.

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Based on determination of heavy metal contents in soils and plants, understanding pollution of heavy metal in soils and plants, as well as the heavy metal accumulation in plants, in order to provide scientific basis for phytoremediation of heavy metals in mining areas. The determination and analysis on the concent of Zn, Cu, Pb, Cd, Mn was made in Niuba and southern mining area in Gejiu City. The result showed that the soil pollution from Cd is the most serious while the pollution from Zn was relative to minimum in Niuba abandoned mining area. In southern mining area, Pb in soil pollution was the most serious while Cu was relative to minimum Analysis on correlation between the heavy metal content in plants and soils was made based on the 5 plant samples (Pyracantha fortuneana, Zea mays, Acroptilon repens, Equisetum ramosissimum and Cucurbita moschata) collected from Niuba reclamation area and 5 plant samples (Corylus yunnanensis, Alnus nepalensis, Pyracantha fortuneana,Cupressus torulosa,Acacia dealbata) from recovery area of southern mining area. The results show that Pyracantha fortuneana has a better correlation with soil than other plants, Cucurbita moschata and soil have poor correlation, Corylus yunnanensis has better correlation with soil compared to other plants, Acacia dealbata has poor correlation with soil.

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48

Chikanbanjar, Roshan, Binod Baniya, and Man Kumar Dhamala. "An Assessment of Forest Structure, Regeneration Status and the Impact of Human Disturbance in Panchase Protected Forest, Nepal." Forestry: Journal of Institute of Forestry, Nepal 17 (December 23, 2020): 42–66. http://dx.doi.org/10.3126/forestry.v17i0.33621.

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Vegetation study is crucial for the biophysical environment and ecosystem balance. Both qualitative and quantitative assessments of the vegetation can give complete picture of the forest ecosystem. In this study, quantitative characteristics of Panchase Protected Forest in Kaski district were analyzed. The study was focused on the structural characteristics of forest stand, its regeneration pattern along altitudinal gradients, and human impacts on vegetation structure. Density, basal area, frequency, and Importance Value Index (IVI) were used to assess the structural characteristics of forest; Density-Diameter (DD) curve and seedling/sapling/tree density relation were used to assess the regeneration status. Counting the number of lopping and cut stumps and quantifying fuelwood consumption pattern of the village were used to assess human disturbance. The vegetation survey showed 21, 17 and 14 species of trees, saplings, and seedlings, respectively. Daphniphyllum himalense was the most dominant species followed by Quercus lamellosa. DD curve showed reverse J-shaped structure indicating sustainable regeneration. Daphniphyllum himalense and Alnus nepalensis were major species of trees consumed as fuelwood and average annual fuelwood consumption was 2083.79 tons. Density of lopped trees and cut stump was in decreasing trend along with elevation. Species richness was higher in moderately disturbed sites. This study has significant implications for protected forest management and biodiversity conservation in Nepal.

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Malik, Ireneusz, Yongbo Tie, Piotr Owczarek, Małgorzata Wistuba, Wojciech Pilorz, and Beata Woskowicz-Ślęzak. "Human-planted alder trees as a protection against debris flows (a dendrochronological study from the Moxi Basin, Southwestern China)." Geochronometria 40, no. 3 (2013): 208–16. http://dx.doi.org/10.2478/s13386-013-0113-x.

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Abstract Large debris flows have destroyed the infrastructure and caused the death of people living in the Moxi Basin (Sichuan Province, Southwestern China). Inhabitants of the Moxi Basin live on the flat surfaces of debris-flow fans, which are also attractive for farming. During the monsoon season debris flows are being formed above the fans. Debris flows can destroy the houses of any people living within the fan surfaces. In order to prevent the adverse effects of flows, people plant alder trees (Alnus nepalensis) at the mouths of debris flow gullies running above debris flow fans. Alders are able to capture the debris transported during flow events. Trees are well adapted to surviving in conditions of environmental stress connected with abrupt transport and deposition of sediment from debris flows. Numerous wounds, tilting and bending of alder trees caused by debris flows only very rarely cause the death of trees. By dating scars and dating the time of alder tilting (through the analysis of annual rings), we have determined the frequency of debris flows occurring at the mouth of the Daozhao valley. In 1980–2012 within the studied debris-flow fan and the Daozhao gully, 2 large debris flow events occurred (1996, 2005) and some smaller events were probably recorded every 2–3 years.

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Kaushik, Kunal, Kime Tare, Tshering Lhamu Sherpa, and Koushik Baruah. "Unveiling Indigenous Traditional Knowledge (ITKs) Using Different Available Plants by the Local People of South Sikkim, India." International Journal of Plant & Soil Science 35, no. 23 (2023): 605–16. http://dx.doi.org/10.9734/ijpss/2023/v35i234280.

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Northeast India is biologically diverse regions, among which the South Sikkim district possesses unique rural landscapes enhanced with endless waves of farming areas and terraced hills. Within this region, three main indigenous groups—Nepali, Lepcha and Bhutia—coexist, contributing to the cultural diversity. Over the years, these communities have cultivated a traditional knowledge based on which they are greatly dependant on diverse plant resources for both protective measures and medicinal practices. These traditional practices encourages a strong local knowledge base. These practices include local plants namely utis (Alnus nepalensis), chilauni (Schima wallichii), wild fern, titepati (Artemisia vulgaris) and many more. However, despite the rich diversity of these cultural practices connected with nature, there is a lack of detailed exploration and documentation for better understanding traditional practices and ethno-medicinal knowledge upheld by these communities. The absence of such documentation underscores a significant gap in our understanding of their cultural heritage, as these ITKs can be further integrated with science to make contribution for adaptive management to many environmental and health issues. Therefore, this study is conducted with the aim to unreveal the potential of these traditional practices and ethno-medicinal knowledge preserve among the diverse communities of South Sikkim, which can help to shed light on their cultural heritage and to recognize their invaluable contributions.

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