نتایج جستجو برای: physiographic factors

تعداد نتایج: 1078537  

Journal: :Tree physiology 2008
Songlin Fei Kim C Steiner

Relationships between advance regeneration of four tree species (red maple (Acer rubrum L.), white oak (Quercus alba L.), chestnut oak (Q. montana Willd.) and northern red oak (Q. rubra L.)) and biotic (non-tree vegetation and canopy composition) and abiotic (soil series and topographic variables) factors were investigated in 52, mature mixed-oak stands in the central Appalachians. Aggregate he...

پایان نامه :0 1370

all analytical methods are generally based on the measurement of a parameter or parameters which are somehow related to the concentration of the species.an ideal analytical method is one in which the concentration of a species can be measured to a high degree precision and accuracy and with a high sensitivity. unfortunately finding such a method is very difficult or sometimes even impossible.in...

The present study was performed to identify diversity indices of herb layer functional groups and its relation to physiographical factors in central Zagros forest, Lorestan. For this purpose, sampling of herbaceous plants was conducted randomly in plots of 2×2 m (n=50) in site. All plants were classified to functional groups including forbs, graminoids and legumes, also Raunkiaerchr('39')s life...

2007
L. N. BRAUN C. B. RENNER

In this analysis, a semi-distributed conceptual runoff model was applied in five basins varying in area between 43 and 195 km, lying in different physiographic regions of Switzerland (lowland, alpine, heavily glaciated high alpine basins) representing various runoff regimes. An objective, labour-intensive optimization procedure was developed and found suitable for deriving optimal parameter val...

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Gully erosion when it comes to positive processes in the most severe operating conditions and the most favorable conditions for the performance of other words is a positive process. One of the most important issues discussed gully erosion monitoring and evaluation of benchmarking is to extract and identify the type of erosion. In this paper the groove factor and drainage ditches, and selected a...

The effects of some environmental factors on distribution of Lonicera nummulariifolia were studied in Manesht-Ghalarang protected area in Ilam Province. Vegetation, physiographic characteristics and soil (texture, Ph, EC, SP, Cao, OC, P, N, K and bulk density, depth of 0-30 cm) was investigated in 125 plots. Totally, 166 plant species belong to 121 genus and 44 families were identified in this ...

Journal: :journal of rangeland science 0
vahid karimian young researchers and elite club, yasooj branch, islamic azad university, yasooj, iran. mohammad reza vahabi assistant professor, department of range and watershed, natural resources college, isfahan university of technology, isfahan, iran. javad roustakhiz member of research instructor, department of plant production, higher education complex of saravan, iran. negin nodehi phd student of range management, gorgan university of agricultural sciences and natural resources sciences, gorgan, iran

the effect of environmental factors on plant vegetation is different. therefore, it is necessary to evaluate role of these factors in medicinal plants growth, development and essential oil. this study was performed to investigate the effect of factors on qualitative and quantitative variations of the essential oil of verbascum songaricum in its habitats in central zagros mountains, iran in 2012...

پایان نامه :دانشگاه آزاد اسلامی - دانشگاه آزاد اسلامی واحد تهران مرکزی - دانشکده مدیریت 1391

one of the most important factors in study of project’s , is the study of environmental opportunities factors the permanent study of environmental opportunity factors . the study of permanent environmental changing and knowing golden threats’ cooperate with possible threats and at the result in structure forming and future skeleton of organization has a vital effects . the petrochemical industr...

Journal: :international journal of advanced biological and biomedical research 2013
yousef askari mohammad kazem parsapour zahra hosseni

to modeling of suitability iranian oak site to establish coppice regenerations, chahartagh forest reserve, ardal region, chaharmehal and bakhtiari province, southern zagros forest, and southwest iranian state was selected. to modeling suitability iranian oak used the physiographic element, soil depth, climatology and distance from village selected. to this study used the raster formats by pixel...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه شهید باهنر کرمان - دانشکده ادبیات و علوم انسانی 1389

abstract this research has been carried out with the purpose of investigating the conditions and related elements of the employment of the educational sciences graduates of hamedan province universities in 1382-1387 academic years. it has been a descriptive research of a correlation kind, and the population number has been 1180 grduates of payam- e noor universites in asad – abaad, kaboudaraha...

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