نتایج جستجو برای: diameter at breast height dbh

تعداد نتایج: 4020209  

Journal: :Ceylon Journal of Science 2023

Information on the diameter increment of tree species is important for developing a sustainable forest harvesting plan and reforestation. Fitting growth model can be utilized to get information. The objective this study was develop predictive annual multispecies stand in Sinharaja Rain Forest Sri Lanka. To fulfill objective, four linear mixedeffect models were fitted predict at breast height (d...

2015
Paulo Eduardo Telles dos Santos Estefano Paludzyszyn Lorenzo Teixeira de Melo da Silva Paula Burigo Vandresen

The aim of this study was to evaluate Eucalyptus badjensis concerning the genetic variation for growth traits and the potential of the species in supporting a breeding programme. The field trial was a provenance/progeny test established in Campina da Alegria, Santa Catarina, Brazil (latitude 26°52'05.1″ S, longitude 51°48'47.5″ W, altitude 1,015 m) in a soil classified as Latossolic Alumino-Fer...

Journal: :Sustainability 2021

Warmer and drier conditions in temperate regions are increasing the length of wildfire season. Given greater fire frequency extent burned areas under climate warming, focus has been placed on predicting post-fire tree mortality as a crucial component sustainable forest management. This study evaluates potential logistic regression models to predict Korean red pine (Pinus densiflora) stands, we ...

Journal: :Forests 2022

The Guazuma crinita Mart. is a dominant species of great economic importance for the inhabitants Peruvian Amazon, standing out its rapid growth and being harvested at an early age. Understanding vertical challenge that researchers have continued to study using different hypsometric modeling techniques. Currently, machine learning techniques, especially artificial neural networks, revolutionized...

Journal: :Pertanika journal of tropical agricultural science 2023

This article analysed the 25–30 years of growth dipterocarps forests that were logged under Selective Management System (SMS) at three sites in Peninsular Malaysia to understand how management regimes affected forest stem density and basal area. The (1) unlogged, (2) moderately all ≥ 65 cm diameter breast height (dbh) non-dipterocarps 60 dbh, (3) intensely 50 dbh 45 dbh. regime is similar SMS p...

Journal: :Forests 2022

Clustering data into similar characteristic groups is a commonly-used strategy in model development. However, the impact of grouping strategies on modeling stem taper has not been well quantified. The objective this study was to compare prediction accuracy different strategies. Specifically, population-level compared models fitted with grouped based taxonomic rank, tree form and size. A total 3...

One of the effective steps for the sustainable forest development is the recognition of habitat condition and silvicultural characteristics of the rare species. Accordingly, this study investigated the aut ecology of Sorbus lorestanica as a rare species of Zagros. For this purpose, the exclusive natural habitat of Sorbus lorestanica in Lorestan province (Gahar rood protected area) was selected ...

2018
Justine Ngoma Eddy Moors Bart Kruijt James H. Speer Royd Vinya Emmanuel N. Chidumayo Rik Leemans

This paper presents data on carbon stocks of tropical tree species along a rainfall gradient. The data was generated from the Sesheke, Namwala, and Kabompo sites in Zambia. Though above-ground data was generated for all these three sites, we uprooted trees to determine below-ground biomass from the Sesheke site only. The vegetation was assessed in all three sites. The data includes tree diamete...

Journal: :Environmental science and pollution research international 2015
Dan L Campbell Richard M Engeman James P Farley

We examined 4-year growth of 15-year-old damaged and undamaged Douglas fir (Pseudotsuga menzesii) after integrating temporary population reductions of mountain beaver (Aplodontia rufa) with thinning in a pre-commercial hand-planted plantation in western Washington. Five treatment combinations were considered: (1) trapping mountain beavers in an unthinned area, (2) trapping before thinning to 65...

Journal: :Ecological applications : a publication of the Ecological Society of America 2016
Alicia Ledo Thomas Cornulier Janine B Illian Yoshiko Iida Abdul Rahman Kassim David F R P Burslem

Accurate estimation of tree biomass is necessary to provide realistic values of the carbon stored in the terrestrial biosphere. A recognized source of errors in tree aboveground biomass (AGB) estimation is introduced when individual tree height values (H) are not directly measured but estimated from diameter at breast height (DBH) using allometric equations. In this paper, we evaluate the perfo...

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