نتایج جستجو برای: 30 dead trees were selected
تعداد نتایج: 3924983 فیلتر نتایج به سال:
The aim of this study is to relate initial stand density and thinning intensity tree diameter, height, volume increment based on continuous 30-year observations in experimental stands Scots pine (Pinus sylvestris L.). experiments were established 1990 1992, the model each trial comprised five variants: control four plots with densities up 3.0–4.4, 2.0–2.4, 1.0–1.2, 0.5–0.6 thousand trees per he...
The quantification of biomass carbon pools is important for understanding carbon cycling in forest ecosystems. This study was designed to reveal the effects of stand age on biomass partitioning and carbon storage of Chinese fir plantation stands in Dabie Mountains of Anhui, East China. A total of six even-aged Chinese fir plantation stands along an age-sequence from 10 to 50 years were selected...
abstract the present study was conducted in order to investigate the impact of an integrated model of form-focused and task-based instruction on iranian efl learners vocabulary learning and retention.it also aimed to detect efl learners attitude towards the implementation of form-focused task-based vocabulary instruction in the classroom. in order to address the purposes of this study, a sampl...
(Tree population and community dynamics in a Brazilian tropical semideciduous forest). The dynamics of the tree community and 30 tree populations were examined in an area of tropical semideciduous forest located on the margin of the Rio Grande, SE Brazil, based on surveys done in 1990 and 1997 in three 0.18 ha plots. The main purpose was to assess whether variations in dynamics were related to ...
one of the most visible aspects of a forest stand structure is the spatial patterns of trees. competition affects on forest structure and its understanding is important, when the purpose of forest management is to imitate the dynamic of natural ecosystems. for this purpose, an unmanaged intact forest was selected with 26 hectares area. all chestnut leaf oak (quercus castaneifolia) trees with a ...
In this research, modeling tree height distributions of beech in natural forests of Masal that is located in Guilan province; was investigated. Inventory was carried out using systematic random sampling with network dimensions of 150×200 m and area sample plot of 0.1 ha. DBH and heights of 630 beech trees in 30 sample plots were measured. Beta, Gamma, Normal, Log-normal and Weibull prob...
Abstract The multifaceted role of deadwood in forest ecosystems has been widely recognized while it is regarded as an indicator sustainable management. Nevertheless, there are hardly any data on volume and structure managed forests Greece. study took place beech the Western Central part Rodopi Mountain Range. objective was to determine amount, variability quality compare with from well natural ...
current studies in second language (l2) learning have revealed the positive role of corrective feedback (cf) in both oral and written forms in different language features. the present study was an attempt to investigate the effect of both direct and indirect written corrective feedback (wcf) on the use of grammatical collocations in l2 writing. the study also sought to examine whether the effec...
Forest fragmentation results in a loss of forest interior and an increase in edge habitat. We studied how understorey bird community composition and habitat variables changed along an edge-to-interior gradient in a 1248-ha lowland rainforest patch in peninsular Malaysia. Birds and environmental variables such as vegetation structure and litter depth were detected within a 25-m radius of each of...
‘Payizeh Znouz’ apple trees have a high capacity for fruit bearing, leading to a small fruit size. Thinning of flowers and fruits can considerably increase the quality of the fruits in prunus trees by improving the size, color, and other features related to the quality of the fruit. An experiment was conducted to study the effects of ammonium thiosulphate (0.25%, 1% and 1.75%) at different stag...
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