نتایج جستجو برای: zagros forest
تعداد نتایج: 107317 فیلتر نتایج به سال:
Abstract Zagros forests have the greatest impact on soil and water protection in western Iran. Despite this, a significant part of these forests, especially Ilam province, suffered lot due to phenomenon oak decline. The first most fundamental thing person must know when combating this issue is distribution areas forests. Therefore, using parameters affecting decline province based fuzzy logic, ...
The magnitude and duration of ongoing global warming affects tree growth, especially in semi-arid forest landscapes, which are typically dominated by a few adapted species. We investigated the effect climatic control on growth Persian oak (Quercus brantii Lindl.), is dominant species Central Zagros Mountains western Iran. A total 48 stem discs was analyzed from trees at three sites, differing l...
Quercus brantii Lindl. and Pistacia atlantica Desf. are the most important tree species in Zagros forests, The abundant use of these trees by the inhabitants of the area has led to a reduction in the quality and quantity of these valuable species, as well as the creation of heterogeneous masses.Recognizing the spatial pattern and the interactions of trees can be a key to managerial interve...
چکیده ندارد.
Fire, as a natural ecological disturbance factor in forest, this study located in the Marivan region, Northern Zagros forest, and western Iranian state of Kurdistan. In each burned and unburned area 30 circle sample plot (1000 m2) were collected by randomized–systematic method in the 100×200 m net (in total 60 plots). In every sample plot the kind of species, number of tree, the heig...
To detection of suitable sampling method to study tree canopy cover in the northern Zagros forest, Baneeh region forest, Kurdistan province, and west of Iran was selected. 40 square sample plots one hectare (100×100 m) were selected and perfect inventoried. In every sample plot the position of tree, kind of species and two diameter of crown (m) were recorded. To study of canopy cover different ...
Collection of appropriate qualitative and quantitative data is necessary for proper management and planning. Used the suitable inventory methods is necessary and accuracy of sampling methods dependent the inventory net and number of sample point. Nearest neighbor sampling method is a one of distance methods and calculated by three equations (Byth and Riple, 1980; Cotam and Curtis, 1956 and Cota...
In order to achieve a sustainable management of land resources and to improve land quality, quantitative assessment of effective factors and soil quality indicators are required. The aim of this study was to evaluate variability of selected soil quality attributes in central Zagros affected by such factors as region, land use and management practices. Twelve sites were selected in three provinc...
In recent years, fundamental changes in the ecosystems of Zagros forest structure have occurred, including the decline of brant’s oak (Quercus bratii Lindl.) that is main species in this region. So this research intends to study trees decline in relation to sylviculture, topography, and soil characteristics. For this purpose, first, parts of forest that showed oak decline were identified by fie...
[1] We use the GEOS-Chem chemical transport model to interpret observations of tropospheric ozone from the Tropospheric Emission Spectrometer (TES) satellite instrument in summer 2005. Observations from TES reveal elevated ozone in the middle troposphere (500–400 hPa) across North Africa and the Middle East. Observed ozone abundances in the middle troposphere are at a maximum in summer and a mi...
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