نتایج جستجو برای: shast kalate forest
تعداد نتایج: 106146 فیلتر نتایج به سال:
Karim Saei was born in 1910, in Mashhad, north eastern Iran, where he got his diploma. He left behind his homeland for Karaj city to study at the Faculty of Agriculture of Tehran University. He passed his course very successfully and received his B.Sc. degree in 1931 followed by a scholarship to study for 2 years at Agronomic Institute in Montpellier, France. He graduated M.Sc. with excellent g...
The carbon sequestaration by plants and soil is one of the easiest and the most econimical ways to reduce atmosphere carbon. This study was conducted on the planted land use of Fraxinus rotundifolia, Cupressus arizonica, obinia pseudoacacia L., Elaeagnus angustifolia, Cedrus libani, and Quercus brantii (persica) in the Arjan plain of Fars province. For each plantation land use, there were three...
Soil flora and fauna play an important role in nutrient cycle and ecosystem sustainability. With the aim of investigating the changes in the activity of these soil organisms as a result of the change of vegetation from forest to rangeland in the mountainous regions of the north of the country, the present study was considered. For this purpose, in the Kinj region of Nowshahr, a forest habitat d...
In order to study the effects of different land uses on soil development, a loess hillslope was selected in Agh-Su area, eastern Golestan Province. Six profiles in four land uses including pasture, Quercuse natural forest, Cupressus artificial forest and a cultivated land, were dug and studied. Samples from different horizons were collected for physico-chemical and microscopic analyses. Importa...
Random forests are one of the most successful ensemble methods which exhibits performance on the level of boosting and support vector machines. The method is fast, robust to noise, does not overfit and offers possibilities for explanation and visualization of its output. We investigate some possibilities to increase strength or decrease correlation of individual trees in the forest. Using sever...
land use change may influence many natural phenomena and ecological processes, including runoff, soil erosion, sedimentation and soil conditions. decreasing of forest area in the north of iran is one of the critical problems in recent years. the aims of this study are to detect land use changes between 1967 to 2002 using satellite images of land sat 7 etm+ (2002), aerial photos and digital topo...
It is shown that many properties of Lyα forest absorbers can be derived using simple physical arguments. Analytical expressions are derived for the density and the size of an absorber as a function of its neutral hydrogen column density, which agree well with both observations and hydrodynamical simulations. An expression is presented to compute ΩIGM from the observed column density distributio...
Important Note! It is not the intention of this writer to teach researchers and others how to climb into the forest canopy. This article is intended as a means of acquainting those who may already be exploring the forest canopy with the idea that there are available techniques for climbing of which they may be unaware, or of which they may be aware but not utilizing. Those wishing to climb into...
To investigate the degree of forest degradation and the effect of land use change on selected soil quality attributes in loess-derived landforms, samples were taken from different land uses including forest, rangeland, degradated rangeland and farmland in Pasang watershed located in the Galikesh area of Golestan province (37°16'N, 55°30'E). The annual average temperature and mean precipitation ...
Forest fires are one of the most important factors that threaten the ecological balance in the countries that are affected by the Mediterranean climate such as Turkey. Forests, that constitute 1⁄4 of the total area of our country, are in great danger of fire, especially during summer period. In 74,294 forest fires, we lost 1,630,000 hectares of forest area since 1937. This area is three times l...
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