نتایج جستجو برای: dbh of trees
تعداد نتایج: 21171343 فیلتر نتایج به سال:
Quantifying forest growth and determination of its affective factors are fundamental for forest management. This study examines the effects of biotic and abiotic factors on the diameter increment of oriental beech (Fagus orientalis Lipsky) in a high-elevation forest in northern Iran using permanent sample plots. The aim of this study was identification and quantifying environmental factors such...
Better information regarding the spatial variability of height, Diameter at Breast Height (DBH) and stocking could improve inventory estimates at the operational Planning Unit since these parameters are used extensively in allometric equations, including stem volume, biomass and carbon calculations. In this study, the influence of stand stocking on height and DBH of two even aged radiata pine (...
The effect of management was studied on the variation of some crucial forest stand features in the district nine of Shafaroud Gilan during a 20-year period. The survey was conducted in the regeneration affectation on 1985 and 2007. The measurement were done with a similar design (systematic randomized sampling in a 150×200m grid and 0.1 ha circular field plots) in 1985 and 2007, respectively. A...
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...
Lack of roost habitat (trees -40 cm diameter breast height [dbh] and _18 m2/ha basal area) can limit populations of Merriam's turkeys (Meleagris gallopavo merriami). The Black Hills region has relatively large populations of Merriam's turkeys, yet trees _40 cm dbh are uncommon. Consequently, I studied roosting habitat of this subspecies in a hierarchical manner to quantify roost habitat require...
This research was conducted to measure quantitative and qualitative characteristics of trees and to determine amount of annual increment for poplar and plane, specially their volume and wood production beside Zayanderud dam. Two plantation areas with 3×3 meters spacing were selected for sampling after field survey. A 30-years-old poplar and a 30-years-old plane stand. In each stand, five tree l...
Amazonian forests play a key role in the global carbon cycle, but there is much uncertainty about the quantity and distribution of carbon stored in these forests. We quantified total aboveground dry biomass (TAGB) in undisturbed central Amazonian rainforests, based on detailed estimates of all live and dead plant material within 20 1 ha plots spanning an extensive (ca. 1000 km) study area. TAGB...
The eastern red bat (Lasiurus borealis) is a common, widespread species that occurs throughout eastern North America; however, information on potential differences in roost selection between sexes is limited. We studied summer diurnal roosting of adult red bats in a diverse forested landscape to: (1) characterize roosts of adult males and females, (2) determine habitat relationships for both se...
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...
Investigation of the ecological characteristics of wildlife species and determination of habitat suitability for them is one of the main pillars for wildlife management and protection. In this study, the winter and spring habitat suitability of black woodpecker (Dryocopusmartius) was studied in ShastKalateh forest. Habitat characteristics, including forest vegetationtype, structural character...
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