نتایج جستجو برای: Diameter at breast height (DBH)

تعداد نتایج: 4020209  

Journal: :Asian journal of forestry 2021

Abstract. Dey T, Ahmed S, Islam MA. 2021. Relationships of tree height-diameter at breast height (DBH) and crown diameter-DBH Acacia auriculiformis plantation. Asian J For 5: 71-75. Measuring the diameter in field is time-consuming needs more logistical efforts. Thus, this study, we have focused on evaluating relationship between with commonly less effortlessly measured parameters such as to re...

Journal: :global journal of environmental science and management 0
m. yousefpoor faculty of natural resources, department of forestry, university of guilan, somehsara, guilan, iran t. rostamie shahraji faculty of natural resources, department of forestry, university of guilan, somehsara, guilan, iran a. eslam bonyad faculty of natural resources, department of forestry, university of guilan, somehsara, guilan, iran m. salahi faculty of basic sciences. university of guilan, rasht, iran

in order to evaluate the possible correlation between the tree density and the human population density, the forested area in nav asalem district located in guilan province was selected. the descriptors of tree number and basal area per hectare as well as the stand density index were used to determine the tree density, which was conducted from a 2014 forest inventory including 62 cluster (558 p...

2016
Eric K. Zenner JeriLynn E. Peck Martina L. Hobi Brigitte Commarmot

Abbreviations TC = Tabaku classification; DBH = diameter at breast height; G/R = gap/regeneration phase; E = establishment phase; EO = early optimum phase; MO = mid optimum phase; LO = late optimum phase; T = terminal phase; D = decay phase; P = plenter phase; CPA = canopy projection area; MaxD =maximum DBH; DS = deadwood share; MeanD = mean DBH; NQD = normalized quartile DBH difference; PSH = ...

Projection of stand development over time relies on accurate height-diameter functions. In this study, we evaluated the capability of 43 nonlinear models to estimate hornbeam heights in a portion Rezaeian experimental forest in Gorgan, Golestan province. We applied a systematic random sampling method to collect field data within a 150×200 meter network (3.33% intensity). It resulted in 200 circ...

2013
Akihiro Sumida Tomiyasu Miyaura Hitoshi Torii

Stem diameter at breast height (DBH) and tree height (H) are commonly used measures of tree growth. We examined patterns of height growth and diameter growth along a stem using a 20-year record of an even-aged hinoki cypress (Chamaecyparis obtusa (Siebold & Zucc.) Endl.) stand. In the region of the stem below the crown (except for the butt swell), diameter growth rates (ΔD) at different heights...

2017
Mu Liu Zhongke Feng Zhixiang Zhang Chenghui Ma Mingming Wang Bo-Ling Lian Renjie Sun Li Zhang

Accurate tree height and diameter at breast height (dbh) are important input variables for growth and yield models. A total of 5503 Chinese Metasequoia trees were used in this study. We studied 53 fitted models, of which 7 were linear models and 46 were non-linear models. These models were divided into two groups of single models and multivariate models according to the number of independent va...

اعظمی, ایاد, حسینی, احمد,

This study was conducted in oak forests of Ilam province in order to evaluate the morphological characteristics of old trees including diameter at breast height, trunk height, whole tree height, minimum and maximum crown diameter, crown health, crown vitality, crown symmetry, health and form of the trunk, Was investigated. Selection of old trees was performed based on the criteria of DBH and wi...

Journal: :جنگل و فرآورده های چوب 0
سمیرا ساسانی فر دانشگاه ارومیه منوچهر نمیرانیان دانشگاه تهران نصرت الله ضرغام دانشگاه تهران

knowing and conducting studies on size characters of trees is essential for assessing the tree volumeand/or other statistical parameters and also forest management. the characteristics of 529 treesincluding diameter at breast height (dbh) and total height were measured in an even-aged fraxinusstand for two periods from 2005 to 2012 in chelir district, a part of experimental kheyrud forest.resul...

Journal: :Remote Sensing 2017
Martin Wieser Gottfried Mandlburger Markus Hollaus Johannes Otepka Philipp Glira Norbert Pfeifer

Diameter at breast height (DBH) is one of the most important parameter in forestry. With increasing use of terrestrial and airborne laser scanning in forestry, new exceeding possibilities to directly derive DBH emerge. In particular, high resolution point clouds from laser scanners on board unmanned aerial systems (UAS) are becoming available over forest areas. In this case study, DBH estimatio...

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید