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Journal articles on the topic 'Dbh distribution'

Author: Grafiati

Published: 2 June 2025

Last updated: 31 July 2025

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1

Bowling, Ernest H., Harold E. Burkhart, Thomas E. Burk, and Donald E. Beck. "A stand-level multispecies growth model for Appalachian hardwoods." Canadian Journal of Forest Research 19, no. 4 (1989): 405–12. http://dx.doi.org/10.1139/x89-064.

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A stand-level growth and yield model was developed to predict future diameter at breast height (dbh) distributions of thinned stands of mixed Appalachian hardwoods. The model allows prediction by species group and dbh class. Stand attributes (basal area per unit area, trees per unit area, minimum stand dbh, and arithmetic mean dbh) were projected through time for the whole stand and for individual species groups. Future dbh distributions were obtained using the three-parameter Weibull probability density function and a variation of the parameter recovery method. The recovery method used employ

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2

Downs, Drew T., Michael A. Clynne, Duane E. Champion, and L. J. Patrick Muffler. "Eruption age and duration of the ∼9 km3 Burney Mountain dacite dome complex, northern California, USA." GSA Bulletin 132, no. 5-6 (2019): 1150–64. http://dx.doi.org/10.1130/b35240.1.

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Abstract At ∼9 km3, the six dacite domes (db1–db6) of Burney Mountain, northern California, USA, constitute the most voluminous Quaternary dome complex in the Cascades volcanic arc. Whole-rock geochemistry, electron microprobe, and petrographic data indicate that the domes are magmatically related, which when integrated with geomorphology and stratigraphic superposition, indicate early (db1, db2, and db3) and late (db4, db5, and db6) erupted groups. We present 40Ar/39Ar ages of 271.9 ± 4.6 ka (db1), 280.8 ± 8.2 and 281.7 ± 6.8 ka (db2), and 290.2 ± 6.0 ka (db3) along with a previous age of 280

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3

Podlaski, Rafał. "Characterization of diameter distribution data in near-natural forests using the Birnbaum–Saunders distribution." Canadian Journal of Forest Research 38, no. 3 (2008): 518–27. http://dx.doi.org/10.1139/x07-190.

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The purpose of this study is to investigate the suitability of the Birnbaum–Saunders distribution to model diameter at breast height (DBH) distributions of near-natural complex structure silver fir ( Abies alba Mill.) – European beech ( Fagus sylvatica L.) forests. The investigations were carried out in Świętokrzyski National Park, situated in Central Poland. To estimate the parameters of the Birnbaum–Saunders distribution, three methods were used: the maximum likelihood method (MLE) and the mean–mean estimator, the modified moment method (MME), and the graphical method (GME). The empirical DB

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Morgenroth, Justin, David Nowak, and Andrew Koeser. "DBH Distributions in America’s Urban Forests—An Overview of Structural Diversity." Forests 11, no. 2 (2020): 135. http://dx.doi.org/10.3390/f11020135.

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Background and Objectives: The structural diversity of an urban forest affects ecosystem service provision, and can inform management, planning, as well as policy. Trunk diameter at breast height (DBH) is amongst the most common measures of tree structure due to its ease of measurement and strong relationships with other structural and non-structural urban forest characteristics. Materials and Methods: In this study, the DBH distributions of urban forests are summarised for 38 American cities with a combined population of over 30 million people and a range of geographic, climatic, and demograp

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Rockwell, Cara A., Manuel R. Guariguata, Mary Menton, et al. "Spatial distribution of Bertholletia excelsa in selectively logged forests of the Peruvian Amazon." Journal of Tropical Ecology 33, no. 2 (2017): 114–27. http://dx.doi.org/10.1017/s0266467416000614.

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Abstract:To date, the spatial distribution pattern and density of Brazil nut trees in logged forest stands is unclear across the Amazon basin. We asked the following questions: (1) What are the densities and spatial distributions of Brazil nut juveniles (10 ≤ dbh < 40 cm) and adults (≥ 40 cm dbh) in three selectively logged Brazil nut concessions (1413 ha sampled) in Madre de Dios, Peru; (2) What is the spatial relationship between adults and juveniles (10 ≤ dbh < 30 cm); and (3) What is the spatial relationship between juveniles (10 ≤ dbh <30 cm) and cut stumps (≥ 10 y)? Spatial anal

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Mack, Timothy J., and Thomas E. Burk. "Equations for Predicting Merchantable Yield and Diameter Distribution for Lake States Red Pine." Northern Journal of Applied Forestry 21, no. 2 (2004): 107–10. http://dx.doi.org/10.1093/njaf/21.2.107.

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Abstract This article describes the construction and application of a stand-level merchantable yield equation for red pine in the Lake States. The equation predicts merchantable cubic foot volume for the stand based on minimum dbh and top size thresholds defined by the user. The merchantable yield equation can be used to model the merchandizing of user-defined products from stands given total stand volume, quadratic mean dbh, and the number of trees per acre. Also presented is an equation for estimating the distribution of trees per acre within a stand by dbh class. The equation predicts numbe

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Sarkkola, Sakari, Virpi Alenius, Hannu Hökkä, Raija Laiho, Juhani Päivänen, and Timo Penttilä. "Changes in structural inequality in Norway spruce stands on peatland sites after water-level drawdown." Canadian Journal of Forest Research 33, no. 2 (2003): 222–31. http://dx.doi.org/10.1139/x02-179.

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Size structural dynamics of naturally established Norway spruce (Picea abies (L.) Karst.) stands growing on peatlands drained for forestry were investigated. The study was based on modelling of diameter at breast height (DBH) distributions of repeatedly measured stands in southern Finland. The Weibull function was used to parameterize the DBH distributions and mixed linear models were constructed to characterize the impacts of different ecological factors on stand dynamics. Initially, the positive skewness of the DBH distributions increased after drainage as a result of increases in stem numbe

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Leak, William B. "Long-Term Structural Change in Uneven-Aged Northern Hardwoods." Forest Science 42, no. 2 (1996): 160–65. http://dx.doi.org/10.1093/forestscience/42.2.160.

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Abstract The diameter distributions of 10 previously unmanaged northern hardwood stands on the Bartlett Experimental Forest in New Hampshire were analyzed to determine changes over a 35 yr period since a single cutting by the diameter-limit or single-tree selection methods. The diameter distribution of an uncut old-growth stand (the Bowl) provided a comparison. The cuttings left residual basal areas of 25 to 96 ft² of basal area per acre (5.7 to 22.0 m²/ha), as well as a wide range in diameter distribution. Basal area of the old-growth stand was 123 ft²/ac (28.2 m²/ha), and the diameter distri

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Kattenborn, T., J. Hernández, J. Lopatin, G. Kattenborn, and F. E. Fassnacht. "PILOT STUDY ON THE RETRIEVAL OF DBH AND DIAMETER DISTRIBUTION OF DECIDUOUS FOREST STANDS USING CAST SHADOWS IN UAV-BASED ORTHOMOSAICS." ISPRS Annals of Photogrammetry, Remote Sensing and Spatial Information Sciences IV-1 (September 26, 2018): 93–99. http://dx.doi.org/10.5194/isprs-annals-iv-1-93-2018.

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<p><strong>Abstract.</strong> One fundamental metric to characterize trees and forest stands is the diameter at breast height (DBH). However, the vertical geometry of tree stems hampers a direct measurement by means of orthographic aerial imagery. Nevertheless, the DBH in deciduous forest stands could be measured from UAV-based imagery using the width of a stem´s cast shadow projected on the ground. Here, we compare in-situ measured DBH of 100 trees with the DBH visually interpreted from cast-shadows derived in UAV-based aerial imagery. Then, based on simulated datasets, we d

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Rijal, Baburam, and Mahadev Sharma. "Modelling Diameter at Breast Height Distribution for Eight Commercial Species in Natural-Origin Mixed Forests of Ontario, Canada." Forests 15, no. 6 (2024): 977. http://dx.doi.org/10.3390/f15060977.

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Diameter at breast height (DBH) is a unique attribute used to characterize forest growth and development for forest management planning and to understand forest ecology. Forest managers require an array of DBHs of forest stands, which can be reconstructed using selected probability distribution functions (PDFs). However, there is a lack of practices that fit PDFs of sub-dominating species grown in natural mixed forests. This study aimed to fit PDFs and develop predictive models for PDF parameters, so that the predicted distribution would represent dynamic forest structures and compositions in

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Zhou, Mengli, Yuan Wang, Shanshan Jin, Decai Wang, and Dongfeng Yan. "Spatial Distribution Pattern of Response of Quercus Variabilis Plantation to Forest Restoration Thinning in a Semi-Arid Area in China." Forests 15, no. 8 (2024): 1278. http://dx.doi.org/10.3390/f15081278.

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Plantations are increasing in frequency and extent across the landscape, especially in China, and forest thinning can accelerate the development of late-successional attributes, thereby enhancing plantation stand structural heterogeneity. To quantify the effect of forest restoration thinning on the spatial heterogeneity and the structure of Quercus variabilis plantations, a restoration thinning experiment in a 40-year-old Quercus variabilis plantation by removing trees from the upper canopy level was conducted; two one-hectare sample plots with thinning and a control (i.e., unlogged) were samp

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Jung, Sanghyun, Daesung Lee, and Jungkee Choi. "Developing Diameter Distribution Models of Major Coniferous Species in South Korea." Forests 16, no. 6 (2025): 961. https://doi.org/10.3390/f16060961.

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This study developed diameter distribution models using the Weibull function for Korean red pine (Pinus densiflora), Korean white pine (P. koraiensis), and Japanese larch (Larix kaempferi). The study data were collected from 49 Korean red pine stands, 54 Korean white pine stands, and 49 Japanese larch stands located in national forests in Gangwon and North Gyeongsang Provinces, South Korea. To identify the optimal method for modeling the diameter distribution of these three species, parameter recovery methods and parameter prediction methods were analyzed. To identify the optimal parameter rec

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Zheng, Zheng, Shubin Zhang, Guoping Yang, et al. "Abundance and distribution of cavity trees in an old-growth subtropical montane evergreen broad-leaved forest." Canadian Journal of Forest Research 39, no. 11 (2009): 2234–45. http://dx.doi.org/10.1139/x09-149.

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We examined the relationship between the density of cavity trees and forest structure characteristics and explored the occurrence of cavity trees among different tree species and diameter breast height (DBH) size in a subtropical evergreen broad-leaved forest in the Ailao Mountains in southwestern China. Cavity trees accounted for 7.9% of living trees and 16.3% of dead trees. Average density of living cavity trees (86.3 trees·ha–1) was 6.9 times that of dead cavity trees. Density of living cavity trees was positively correlated with the density of living trees. Cavity trees showed a skewed dis

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Duanmu, Jialong, and Yanqiu Xing. "Annular Neighboring Points Distribution Analysis: A Novel PLS Stem Point Cloud Preprocessing Algorithm for DBH Estimation." Remote Sensing 12, no. 5 (2020): 808. http://dx.doi.org/10.3390/rs12050808.

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Personal laser scanning (PLS) has significant potential for estimating the in-situ diameter of breast height (DBH) with high efficiency and precision, which improves the understanding of forest structure and aids in building carbon cycle models in the big data era. PLS collects more complete stem point cloud data compared with the present laser scanning technology. However, there is still no significant advantage of DBH estimation accuracy. Because the error caused by merging different point cloud fragments has not yet been eliminated, overlapping and inaccurate co-registered point cloud fragm

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Nicodemo, Maria Luiza Franceschi, Marcelo Dias Muller, Antônio Aparecido Carpanezzi, and Vanderley Porfírio-da-Silva. "ALLOMETRIC MODELS FOR ESTIMATING ABOVEGROUND BIOMASS AND BIOMASS ALLOCATION OF CAPIXINGUI TREES (Croton floribundus Spreng.) IN AN AGRISILVICULTURAL SYSTEM." Revista Árvore 40, no. 2 (2016): 279–88. http://dx.doi.org/10.1590/0100-67622016000200010.

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ABSTRACT The objective of this study was to select allometric models to estimate total and pooled aboveground biomass of 4.5-year-old capixingui trees established in an agrisilvicultural system. Aboveground biomass distribution of capixingui was also evaluated. Single- (diameter at breast height [DBH] or crown diameter or stem diameter as the independent variable) and double-entry (DBH or crown diameter or stem diameter and total height as independent variables) models were studied. The estimated total biomass was 17.3 t.ha-1, corresponding to 86.6 kg per tree. All models showed a good fit to

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16

Santos Júnior, Nilson Reinaldo Fernandes dos, Diogo Martins Rosa, José Das Dores de Sá Rocha, Marta Silvana Volpato Sccoti, Scheila Cristina Biazatti, and Karen Janones da Rocha. "Ecological and environmental indicators of Brazil Nut Tree (Bertholletia excelsa Bonpl.) in Flona do Jamari, Rondônia." Revista Ibero-Americana de Ciências Ambientais 11, no. 7 (2020): 740–51. http://dx.doi.org/10.6008/cbpc2179-6858.2020.007.0056.

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Mapping Brazil nut trees in the Amazon is essential for indicating its distribution patterns within different ecosystems, while also being useful to estimate the species productive potential. This study aimed to evaluate the spatial distribution of Brazil nut trees in Flona do Jamari – RO, considering its environmental and topographic conditions. A census was performed for all individual trees sized ≥ 35 cm in diameter at 1.30 m breast height (DBH) above the ground of six Annual Production Units (APU) in Forest Management Unit III (FMU-III), a 11,011.2 ha area of Flona do Jamari, RO. DBH and g

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Rudge, Mitchel L. M., Shaun R. Levick, Renee E. Bartolo, and Peter D. Erskine. "Modelling the Diameter Distribution of Savanna Trees with Drone-Based LiDAR." Remote Sensing 13, no. 7 (2021): 1266. http://dx.doi.org/10.3390/rs13071266.

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The diameter distribution of savanna tree populations is a valuable indicator of savanna health because changes in the number and size of trees can signal a shift from savanna to grassland or forest. Savanna diameter distributions have traditionally been monitored with forestry techniques, where stem diameter at breast height (DBH) is measured in the field within defined sub-hectare plots. However, because the spatial scale of these plots is often misaligned with the scale of variability in tree populations, there is a need for techniques that can scale-up diameter distribution surveys. Dense

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Guo, Yili, Junmeng Lu, Scott B. Franklin, et al. "Spatial distribution of tree species in a species-rich subtropical mountain forest in central China." Canadian Journal of Forest Research 43, no. 9 (2013): 826–35. http://dx.doi.org/10.1139/cjfr-2013-0084.

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Inferring the processes underlying the spatial distribution patterns of tree species is fundamental for understanding species coexistence. Here, we examined spatial distribution patterns of woody plants by using the univariate pair correlation function to quantify spatial patterns of species in a fullly mapped 25 ha subtropical plot in China. We analyzed the relationships between the species attributes and spatial distribution patterns of 137 tree species with at least one individual per hectare. The results showed that aggregated distributions were the dominant pattern for species in the Bada

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19

Wu, Xuhan, Weiliang Fan, Huaqiang Du, Hongli Ge, Feilong Huang, and Xiaojun Xu. "Estimating Crown Structure Parameters of Moso Bamboo: Leaf Area and Leaf Angle Distribution." Forests 10, no. 8 (2019): 686. http://dx.doi.org/10.3390/f10080686.

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Both leaf area (LA) and leaf angle distribution are the most important eco-physiological measures of tree crowns. However, there are limited published investigations on the two parameters of Moso bamboo (Phyllostachys edulis (Carrière) J. Houz., abbreviated as MB). The aim of this study was to develop allometric equations for predicting crown LA of MB by taking the diameter at breast height (DBH) and tree height (H) as predictors and to investigate the leaf angle distribution of a MB crown based on direct leaf angle measurements. Data were destructively sampled from 29 MB crowns including DBH,

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20

Hossain, MA, MK Hossain, MS Alam, and MM Abdullah Al Mamun. "Structural composition and distribution of tree species of Dudhpukuria-Dhopachori Wildlife Sanctuary, Chittagong, Bangladesh." Journal of Biodiversity Conservation and Bioresource Management 3, no. 1 (2018): 17–30. http://dx.doi.org/10.3329/jbcbm.v3i1.36757.

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Structural composition based on diameter and height class distribution of the tree species of Dudhpukuria-Dhopachori Wildlife Sanctuary, Chittagong, Bangladesh was assessed. A total of 183 tree species having ≥ 10 DBH belonging to 125 genera and 48 families was recorded from the study area. Different species were found to dominate in different DBH classes, i.e. Aporosa wallichii (4.06%), Artocarpus chama (1.54%) and Dillenia pentagyna (0.38%) dominated 10 - < 25 cm, 25 - < 40 cm and 40 - < 55 cm DBH, respectively. Swintonia floribunda was found in maximum (7 out of 8) number of DBH cl

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Yao, Liangjin, Yuanke Xu, Bo Jiang, et al. "Competition Restricts the Growth, Development, and Propagation of Carpinus tientaiensis: A Rare and Endangered Species in China." Forests 12, no. 4 (2021): 503. http://dx.doi.org/10.3390/f12040503.

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The protection and propagation of rare and endangered species are key to the preservation of their population development; however, due to the scarcity of individuals, the potential effects and status of rare and endangered species in the whole forest ecosystem are still poorly understood. Using data from a 60 × 140 m forest dynamic monitoring sample of the Carpinus tientaiensis (Betulaceae) species in Zhejiang of Southeast China. We assessed the population distribution and diameter at breast height (DBH) structure of the Carpinus tientaiensis species, which was a rare and endangered species,

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Ducey, Mark J. "The Ratio of Additive and Traditional Stand Density Indices." Western Journal of Applied Forestry 24, no. 1 (2009): 5–10. http://dx.doi.org/10.1093/wjaf/24.1.5.

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Abstract The ratio between additive and original versions of Reineke's stand density index (SDI) has been used as a descriptor of stand structural complexity. That ratio also can be informative for designing efficient sampling methods and for the design of silvicultural experiments. Previous analyses of this ratio have assumed a diameter distribution without truncation, such that trees from zero to infinite dbh are possible. Truncation of the diameter distribution, e.g., by tallying only trees larger than some minimum dbh, moves the ratio much closer to one when the stand has a classic balance

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Huish, Ryan D., Tevita Faka'osi, Heimuli Likiafu, Joseva Mateboto, and Katherine H. Huish. "Distribution, population structure, and management of a rare sandalwood (Santalum yasi, Santalaceae) in Fiji and Tonga." Pacific Conservation Biology 21, no. 1 (2015): 27. http://dx.doi.org/10.1071/pc14902.

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The aromatic heartwood of Santalum yasi has been harvested extensively in Fiji and Tonga over the past two centuries for international trade in the medicinal, perfume, and incense industry and other cultural purposes. Field surveys and a review of historic and modern documents reveal a sparse and scattered distribution and indicate that the natural distribution of S. yasi has fluctuated over time, even declining to local extinction in the wild in some areas, while S. album has been introduced and naturalisation of S. yasi × S. album hybrids is evident. Population data collected along transects

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Hui, Zhenyang, Lei Lin, Shuanggen Jin, Yuanping Xia, and Yao Yevenyo Ziggah. "A Reliable DBH Estimation Method Using Terrestrial LiDAR Points through Polar Coordinate Transformation and Progressive Outlier Removal." Forests 15, no. 6 (2024): 1031. http://dx.doi.org/10.3390/f15061031.

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Diameter at breast height (DBH) is a crucial parameter for forest inventory. However, accurately estimating DBH remains challenging due to the noisy and incomplete cross-sectional points. To address this, this paper proposed a reliable DBH estimation method using terrestrial LiDAR points through polar coordinate transformation and progressive outlier removal. In this paper, the initial center was initially detected by rasterizing the convex hull, and then the Cartesian coordinates were transformed into polar coordinates. In the polar coordinate system, the outliers were classified as low and h

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Wang, Xiao, Lina Jiang, Xiaohui Yang, Zhongjie Shi, and Pengtao Yu. "Does Shrub Encroachment Indicate Ecosystem Degradation? A Perspective Based on the Spatial Patterns of Woody Plants in a Temperate Savanna-Like Ecosystem of Inner Mongolia, China." Forests 11, no. 12 (2020): 1248. http://dx.doi.org/10.3390/f11121248.

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Shrub encroachment, i.e., shrub emergence or an increase in woody plant cover, has been widely observed in arid and semiarid grasslands and savannas worldwide since the 2000s. However, until now, there has been a clear division of opinion regarding its ecological implications. One view is that shrub encroachment is an indicator of ecological degradation, and the other is that shrub encroachment is a sign of the restoration of degraded ecosystems. This division leads to completely different judgments about the states and transition phases of shrub-encroached ecosystems, which further affects de

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Sakharov, Yaroslav, Nadezda Yagova, Vyacheslav Pilipenko, Oksana Yagodkina, and Sergey Garanin. "Spatial distribution of auroral precipitation and failures in railway automatics at the north of European Russia." Solar-Terrestrial Physics 10, no. 4 (2024): 106–13. https://doi.org/10.12737/stp-104202412.

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We study the relationship between space weather disturbances and spatial distribution of failures in railway automatics at segments of Northern and October railways in 2001–2006. During the most intensive magnetic storms that caused numerous failures, latitude distribution of auroral electron precipitation and local geomagnetic disturbance, determined as mean absolute value of time derivative of the geomagnetic field horizontal component |dBH/dt|, are examined. We show that in magnetic storm main and recovery phases the segments, where the failures were recorded, correspond to the region of in

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Rosenberg, Daniel K., James D. Fraser, and Dean F. Stauffer. "Use and Characteristics of Snags in Young and Old Forest Stands in Southwest Virginia." Forest Science 34, no. 1 (1988): 224–28. http://dx.doi.org/10.1093/forestscience/34.1.224.

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Abstract Snags were sampled in chestnut oak (Quercus prinus) and oak-hickory (Quercus spp.—Carya spp.) stands in southwest Virginia. More large (≥17 cm dbh) snags were found in stands ≥100 years of age and more small (≤10 cm dbh) snags were found in stands &lt;80 years of age, than expected under the model of equal distribution among age classes (χ2 = 25.3, df = 6, P = 0.0003). Log-linear models suggested that large diameter snags are more likely to be used by foraging birds than smaller snags. Tall snags were also used more than short ones, but 4-way log-linear models suggested that this

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Tong, Q. J., and S. Y. Zhang. "Impact of initial spacing and precommercial thinning on jack pine tree growth and stem quality." Forestry Chronicle 81, no. 3 (2005): 418–28. http://dx.doi.org/10.5558/tfc81418-3.

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The objective of this paper was to investigate the impact of initial spacing and pre-commercial thinning (PCT) on tree growth, characteristics and stem quality in plantation-grown jack pine (Pinus banksiana Lamb.) after 58 years of growth. Four spacings including three initial spacings without PCT treatment, i.e., 1.52 × 1.52 m (5 × 5 ft), 2.13 × 2.13 m (7 × 7 ft) and 2.74 × 2.74 m (9 × 9 ft) and one initial spacing with PCT treatment (5 × 5 ft thinned to 7 × 7 ft at age 14), were chosen to analyze diameter at breast height (DBH) distribution, survival, and various tree and stem quality charac

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Zhou, Xiao, Yaxiong Zheng, Fengying Guan, Xiao Xiao, Xuan Zhang, and Chengji Li. "Compatible Biomass Model of Moso Bamboo with Measurement Error." Forests 13, no. 5 (2022): 774. http://dx.doi.org/10.3390/f13050774.

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Moso bamboo is characterized by its fast growth and high yield and is important as a carbon sink species. Therefore, understanding the biomass distribution of its components is crucial. Based on the measured individual biomass data of 66 Phyllostachys heterocycla cv. Pubescens plants in the Yixing state-owned forest in Jiangsu Province, nonlinear simultaneous equations with measurement errors were constructed using nonlinear error-in-variable models (NEIVM) (one step, two step) and nonlinear seemingly unrelated regression (NSUR). Variables affecting biomass were evaluated, including diameter a

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McRoberts, Ronald E., Jerold T. Hahn, Glenda J. Hefty, and Jerry R. Van Cleve. "Variation in forest inventory field measurements." Canadian Journal of Forest Research 24, no. 9 (1994): 1766–70. http://dx.doi.org/10.1139/x94-228.

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Field crews from the North Central Forest Experiment Station independently measured two forest inventory plots in Michigan's Upper Peninsula; one plot was measured by eight crews and the other was measured by nine different crews. For 61 trees, the variation in measurements of diameter at breast height (DBH), crown ratio, and site index is described. For DBH, the distribution of field crew mistakes and the distribution of measurements without mistakes are described separately. For crown ratio, the distribution of differences between individual estimates and the most frequently occurring estima

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Yao, Liangjin, Zhigao Wang, Chuping Wu, et al. "Competition and Facilitation Co-Regulate Spatial Patterns and Coexistence in a Coniferous and Broad-Leaved Mixed Forest Community in Zhejiang, China." Forests 13, no. 9 (2022): 1356. http://dx.doi.org/10.3390/f13091356.

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Plant interactions have long been the subject of intense research and debate in ecology. Competition and facilitation are known to be the basic drivers of community structure, species coexistence, and forest succession dynamics; however, there remains a lack of understanding of how spatial patterns affect these in the mixed forest community of coniferous and broad-leaved species. In the present study, we studied the roles of competition and facilitation in a mixed forest community in the Zhejiang Province, China. For this, we divided plants measured at a study site according to the size of the

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Asmar, Abd Rais. "DANA PERIMBANGAN DALAM PEMBAGIAN URUSAN PEMERINTAHAN PUSAT DAN DAERAH." Jurisprudentie : Jurusan Ilmu Hukum Fakultas Syariah dan Hukum 4, no. 2 (2017): 1. http://dx.doi.org/10.24252/jurisprudentie.v4i2.4038.

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The issue of balancing funds which is a potential source of revenue for the regions is closely related to the central and regional governmental affairs because the funds are sourced from the state budget. Balancing Funds are funds sourced from APBN revenues allocated to regions to fund local needs in the context of decentralization implementation. The current DBH allocation is too complex as it lacks a strong foundation and varies the basis of assignment for revenue sharing. The DBH distribution mechanisms in the regions also often experience delays.Keywords: Balancing Fund Permasalahan dana p

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Larocque, G. R. "Examining Different Concepts for the Development of a Distance-Dependent Competition Model for Red Pine Diameter Growth Using Long-Term Stand Data Differing in Initial Stand Density." Forest Science 48, no. 1 (2002): 24–34. http://dx.doi.org/10.1093/forestscience/48.1.24.

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Abstract Red pine (Pinus resinosa Ait.) data collected from age 13 to age 43 in a spacing trial were used to develop a distance-dependent individual-tree diameter growth model. The traditional concept of zone of influence in competition indices was redefined, and differences in asymmetry in above- and below-ground competition were represented. The availability of remeasured crown dimensions data allowed for realistic representation of the dynamics of crown interference at the canopy level. Diameter at breast height (dbh) increment was expressed in terms of absolute growth rate, relative growth

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Hu, Dong, Yao Xu, Yongfu Chai, et al. "Spatial Distribution Pattern and Genetic Diversity of Quercus wutaishanica Mayr Population in Loess Plateau of China." Forests 13, no. 9 (2022): 1375. http://dx.doi.org/10.3390/f13091375.

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The Quercus wutaishanica forest influences the ecological environment and climate characteristics and plays an important ecological role in the Loess Plateau region. However, we still know relatively little about the genetic diversity and spatial distribution of Q. wutaishanica. Here, we assessed the genetic diversity of Q. wutaishanica using simple sequence repeats and used the point pattern method to analyze the spatial distribution patterns as well as intraspecific relationships. Our results indicate that the diameter structure of the Q. wutaishanica population was inverted J-type, showing

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Cowett, F. D., N. L. Bassuk, J. Grace, and K. Vorstadt. "Tracking Changes to Urban Trees over 100 Years in Ithaca, NY, USA." Arboriculture & Urban Forestry 47, no. 1 (2021): 3–24. http://dx.doi.org/10.48044/jauf.2021.002.

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Municipally managed urban trees provide environmental, social, and economic benefits. Continued provision of these benefits depends on the health and sustainability of these trees, which depends in turn on tree managers having the type of information usually found in a tree inventory. The city of Ithaca, New York, USA possesses 7 inventories of its street and park trees dating back to 1902. This paper uses the data contained in these inventories to assess the health and sustainability of the city’s street and park tree populations. Attention is given to the structure of these populations with

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Hu, Jiamin, Weihua Wen, and Zongzheng Chai. "Stand States Drive Disparities in the Carbon Storage Within a Masson Pine Forest Ecosystem." Forests 16, no. 3 (2025): 499. https://doi.org/10.3390/f16030499.

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Forest ecosystems are important for carbon storage but vary in their ability to do so. Here, we examined the relationship between stand state and ecosystem carbon storage in Pinus massoniana forests, pinpointed key stand state indicators affecting carbon storage, and provided a basis for management to enhance ecosystem carbon storage. We selected nine indicators representing structure (diameter at breast height (DBH) distribution, tree height distribution, stand density), vitality (stand dominance, stand growth, and tree health), and diversity (species composition, species diversity, and speci

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Nothdurft, Arne, Andreas Tockner, Sarah Witzmann, et al. "Spatial Prediction of Diameter Distributions for the Alpine Protection Forests in Ebensee, Austria, Using ALS/PLS and Spatial Distributional Regression Models." Remote Sensing 16, no. 12 (2024): 2181. http://dx.doi.org/10.3390/rs16122181.

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A novel Bayesian spatial distributional regression model is presented to predict forest structural diversity in terms of the distributions of the stem diameter at breast height (DBH) in the protection forests in Ebensee, Austria. The distributional regression approach overcomes the limitations and uncertainties of traditional regression modeling, in which the conditional mean of the response is regressed against explanatory variables. The distributional regression addresses the complete conditional response distribution, instead. In total 36,338 sample trees were measured via a handheld mobile

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Breidenbach, Johannes, Christian Gläser, and Matthias Schmidt. "Estimation of diameter distributions by means of airborne laser scanner data." Canadian Journal of Forest Research 38, no. 6 (2008): 1611–20. http://dx.doi.org/10.1139/x07-237.

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Diameter distributions are an important source of information for estimating the timber assortment in forest stands. In this paper, a one-step procedure for deriving the parameters of a Weibull function, itself used to describe diameter distributions, is presented. A generalized linear model (GLM) is employed that allows for an estimation of the shape and scale parameters as functions of different predictors. The GLM was fit using 495 sample plots from a conventional sample-plot inventory. Plotwise height metrics derived from airborne laser scanner data serve as covariates (auxiliary variables

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Liu, Jiping, and Harold E. Burkhart. "Notes: Spatial Autocorrelation of Diameter and Height Increment Predictions from Two Stand Simulators for Loblolly Pine." Forest Science 40, no. 2 (1994): 349–56. http://dx.doi.org/10.1093/forestscience/40.2.349.

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Abstract Using Moran indices, the spatial autocorrelation properties of diameter and height increment prediction from two loblolly pine stand simulators, TRULOB and PTAEDA2, were examined. Preliminary results indicated that the distance-dependent stand simulator (PTAEDA2) generated more desirable error structures, i.e., less spatially dependent, than the distance independent stand simulator (TRULOB) did both for total height and for dbh (diameter at breast height). The distribution of autocorrelation test statistics was positively shifted and positively skewed, possibly due to the lack of abil

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Shifley, Stephen R., Brian L. Brookshire, David R. Larsen, and Laura A. Herbeck. "Snags and Down Wood in Missouri Old-Growth and Mature Second-Growth Forests." Northern Journal of Applied Forestry 14, no. 4 (1997): 165–72. http://dx.doi.org/10.1093/njaf/14.4.165.

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Abstract As forest managers in the Midwest focus more attention toward understanding and maintaining ecosystem processes, greater emphasis is being placed on the role of snags and down wood in providing wildlife habitat, cycling nutrients, and maintaining continuity in forest structure following harvest. We measured five remnant old-growth hardwood tracts and six mature, second-growth, hardwood tracts in Missouri and compared findings concerning (1) the volume of down wood and (2) the number and size distribution of snags (i.e., standing dead trees). Volume of down wood ≥ 10 cm in diameter ave

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Reyes Jr, Tomas D., Jeralyn D. Abadingo, Shiela G. Tabuno, Eunice K. L. Serino, Joecel B. Mabanag, and Rizaldy C. Merdacal. "Floristic Inventory of The Proposed Site for Tarsier Tourism Center in Villa Aurora, Bilar, Bohol, Philippines." Jurnal Ilmu Kehutanan 9, no. 2 (2016): 67. http://dx.doi.org/10.22146/jik.10188.

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The study assessed the present vegetation composition of the Proposed Site for the Tarsier Tourism Center (PTTC) at Villa Aurora, Bilar, Bohol and performed a comparative analysis with the existing Tarsier Sanctuary (TS) at Canapnapan, Corella, Bohol. The basis for comparison was the computed importance values, species richness, species dominance, and percent distribution of plants according to self-defined DBH classes. Results showed that both sites had very high species richness and evenness values. Common overstorey and understorey plant species found in both areas were katagpo (Psychotria

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Araujo, Raquel Fernandes, Jeffrey Q. Chambers, Carlos Henrique Souza Celes, et al. "Integrating high resolution drone imagery and forest inventory to distinguish canopy and understory trees and quantify their contributions to forest structure and dynamics." PLOS ONE 15, no. 12 (2020): e0243079. http://dx.doi.org/10.1371/journal.pone.0243079.

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Tree growth and survival differ strongly between canopy trees (those directly exposed to overhead light), and understory trees. However, the structural complexity of many tropical forests makes it difficult to determine canopy positions. The integration of remote sensing and ground-based data enables this determination and measurements of how canopy and understory trees differ in structure and dynamics. Here we analyzed 2 cm resolution RGB imagery collected by a Remotely Piloted Aircraft System (RPAS), also known as drone, together with two decades of bi-annual tree censuses for 2 ha of old gr

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Fu, Liyong, Guangshuang Duan, Qiaolin Ye, et al. "Prediction of Individual Tree Diameter Using a Nonlinear Mixed-Effects Modeling Approach and Airborne LiDAR Data." Remote Sensing 12, no. 7 (2020): 1066. http://dx.doi.org/10.3390/rs12071066.

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Rapidly advancing airborne laser scanning technology has become greatly useful to estimate tree- and stand-level variables at a large scale using high spatial resolution data. Compared with that of ground measurements, the accuracy of the inferred information of diameter at breast height (DBH) from a remotely sensed database and the models developed with traditional regression approaches (e.g., ordinary least square regression) may not be sufficient. Thus, this regression approach is no longer appropriate to develop accurate models and predict DBH from remotely sensed-related variables because

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Podlaski, Rafał. "Two-Component Mixture Models for Diameter Distributions in Mixed-Species, Two-Age Cohort Stands." Forest Science 56, no. 4 (2010): 379–90. http://dx.doi.org/10.1093/forestscience/56.4.379.

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Abstract The objectives of this study were to investigate the suitability of two-component Weibull and gamma mixtures to model the dbh distribution of a mixed-species, two-age cohort stands and for age cohort determination and to compare several methods to choose initial parameter values for maximum likelihood estimation of mixture models. Investigations were carried out in near-natural, fir (Abies alba Mill.)–beech (Fagus sylvatica L.), two-age cohort stands in the Świętokrzyski National Park (Central Poland), where unusually high mortality of fir followed by its recovery and revitalization h

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Reta, Haimanot, Sebsebe Demissew, and Zemede Asfaw. "Plant Diversity Study on Kelekal Protected Forest in Debre Markos Town District, East Gojjam, Amhara Region, Ethiopia." Sustainability in Environment 4, no. 2 (2019): p98. http://dx.doi.org/10.22158/se.v4n2p98.

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This research was aimed to investigate floristic composition and structure of Kelekal protected forest established since 1999. For plant data collection, 33 different quadrnts having 400 m2 along seven different line transect were used. The structural data like Frequencies, Density, DBH, Hight, Relative dominance, Relative density and IVI values were calculated for each species and for the selectedwoody plants. The woody plant species having DBH?2.5 cm and height greater than 2.5 m were measured. A hierarchical cluster analysis was performed to classify different plant communities. Shannon win

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Sakharov, Yaroslav, Nadezda Yagova, Vyacheslav Pilipenko, Oksana Yagodkina, and Sergey Garanin. "Spatial distribution of auroral precipitation and failures in railway automatics at the north of European Russia." Solnechno-Zemnaya Fizika 10, no. 4 (2024): 114–21. https://doi.org/10.12737/szf-104202412.

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We study the relationship between space weather disturbances and spatial distribution of failures in railway automatics at segments of Northern and October railways in 2001–2006. During the most intensive magnetic storms that caused numerous failures, latitude distribution of auroral electron precipitation and local geomagnetic disturbance, determined as mean absolute value of time derivative of the geomagnetic field horizontal component |dBH/dt|, are examined. We show that in magnetic storm main and recovery phases the segments, where the failures were recorded, correspond to the region of in

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Peng, Ping-Hsun, Hsiao-Lung Pan, Sheng-Lin Tang, et al. "Effects of Thinning on the Growth and Relative Change in the Diameter of a Mahogany Plantation." Forests 13, no. 2 (2022): 213. http://dx.doi.org/10.3390/f13020213.

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Honduras mahogany (Swietenia macrophylla King) is an important forestry tree species in low altitude areas in central and southern Taiwan and has good potential for sustainable forestry in tropical regions. The aim of this study was to understand changes in the diameter at breast height (DBH) and stand structure of large-leafed mahogany. A lower layer thinning experiment was conducted in 2011 in a 14-year-old mahogany plantation in Guanmiao, Tainan City, Taiwan. Four zones of heavy, moderate, and light thinning, as well as a control were established and DBH surveys were conducted in 2011, 2012

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Drexhage, Michael, Marc Chauvière, Francis Colin, and Christian NN Nielsen. "Development of structural root architecture and allometry of Quercus petraea." Canadian Journal of Forest Research 29, no. 5 (1999): 600–608. http://dx.doi.org/10.1139/x99-027.

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Root growth direction, radial distribution of roots, and biomass partitioning within the root system were examined on fifty-five 20 and 28-year-old sessile oak (Quercus petraea (Matt.) Liebl.) trees. The root systems were spatially subdivided into three concentric cylinders. Diameters and compass direction of roots were recorded at each point where they crossed one of the cylinders. Analysis of the distribution of root cross-sectional area (Ar) at 30 cm radius from the stem showed clustering in a preferred direction only for 10 small trees (diameter at breast height (DBH) < 9 cm). A classif

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Loewenstein, Edward F., Paul S. Johnson, and Harold E. Garrett. "Age and diameter structure of a managed uneven-aged oak forest." Canadian Journal of Forest Research 30, no. 7 (2000): 1060–70. http://dx.doi.org/10.1139/x00-036.

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We studied the age and diameter structure on one section (259 ha) of a 63 000-ha privately owned forest in the Ozark Highlands of Missouri. The forest has been managed using a partial cutting strategy since 1954. Because a majority of the trees predate current management practices, the existing stand structure is a function of not only the current silvicultural system and the dynamics of this ecosystem but also the initial stand conditions. To determine age structure and evaluate the relationship of diameter and age, a random sample of 600 oaks [Formula: see text]4 cm DBH were collected from t

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Koszykowska, Marlena, Jarosław Całka, Aleksandra Nidzgorska, and Barbara Jana. "Exogenous long-term treatment with 17?-oestradiol alters the innervation pattern in pig ovary." Reproduction, Fertility and Development 25, no. 4 (2013): 661. http://dx.doi.org/10.1071/rd11271.

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The aim of the present study was to determine the effect of long-term 17β-oestradiol (E2) exposure, a simulation of pathological states that occur with oestrogen overproduction, on the innervation patterns of ovaries in adult gilts. The intraovarian distribution and density of nerve fibres immunoreactive (IR) to protein gene product (PGP) 9.5 and containing dopamine-β-hydroxylase (DBH), neuropeptide Y (NPY), somatostatin (SOM) and galanin (GAL) were determined. From Day 4 of the first oestrous cycle to Day 20 of the second cycle studied, experimental gilts were injected with E2 (1000 μg every

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