نتایج جستجو برای: zagross forests
تعداد نتایج: 39428 فیلتر نتایج به سال:
to evaluate the genetic diversity of native populations of crown imperial (fritillaria imperialis l.) in zagross region, issr molecular along with 32 morphological traits were employed. a number of 160 samples corresponding to eight zagross populations distributed in six provinces were collected and assessed. using six primers, 57 bands were totally produced from which 49 were polymorphic. mean...
background & aim: by increasing resistance of fish pathogens to chemical drugs, using herbal plants with antimicrobial properties is necessary.in this study, the composition of the essential oil and antimicrobial activity of aerial parts of achillea wilhelmsii c.koch growing wild in zagross mountain (southwest of iran) was analyzed against common bacterial and fungal pathogens of fish. expe...
the assessment of the quantitative and qualitative changes, the result of the impacts imposed by natural factors, and human interventions during specific sampling periods has a substantial influence on nature, management method and tending operation of every region’s forests. the present research was carried out in golestan province forests (iran) over an 11- year period and the obtained statis...
conclusions the crude extract of streptomyces sp. acs52 had high antibacterial activity against a wide spectrum of bacteria and could be of interest due to its features such as ability to grow at low temperatures and alkaline ph levels. results streptomyces sp. acs52 is a cold-resistant alkalophilic bacterium strain with antibacterial activity against a broad spectrum of pathogenic bacteria. th...
orography plays a substantial role in the formation and evolution of many atmospheric phenomena. observations indicate that two mountain ranges to the southwest of the red sea and west of iran (zagross mountain range) play a crucial role in the formation, evolution and activities of synoptic weather systems over iran. observations also, indicate that there are considerable differences between t...
The assessment of the quantitative and qualitative changes, the result of the impacts imposed by natural factors, and human interventions during specific sampling periods has a substantial influence on nature, management method and tending operation of every region’s forests. The present research was carried out in Golestan province forests (Iran) over an 11- year period and the obtained statis...
in order to investigate the effects of management models on the diversity of wooden species, forests of third series of shiler, the first division mehrbanrud watershed and third and fourth series of eight division of behshahr – neka townships were studied with participatory and governmental management respectively. the diversity of the wooden species have been evaluated by diversity parametric...
در این مطالعه، تعداد زیادی نمونه درختی از رویشگاه های مختلف و نمونه های هرباریومی مورد مطالعه قرار گرفت. مشکلات تاکسونومیک فراوانی در رابطه با شناسایی گونه های جنس نمدار در ایران وجود دارد، نتایج مطالعات تعدادی از گیاه شناسان بر روی این جنس، تنها نمایانگر حضور گونه tilia platyphyllos و در مطالعات برخی گونه tilia dasystyla و در تعدادی هم گونه tilia rubra در ایران است. در واقع نتایج مطالعات اکث...
Mapping of forest extent is a prerequisite to acquire quantitative and qualitative information about forests and to formulate management and conservation strategies. forest canopy density (FCD) model is one of the useful RS methods for forest mapping using satellite images. One of the most serious challenges in FCD model is the weakness in the calculation of canopy density in low density forest...
Trees with sufficient nutrition are known to allocate carbon preferentially to aboveground plant parts. Our global study of 49 forests revealed an even more fundamental carbon allocation response to nutrient availability: forests with high-nutrient availability use 58 ± 3% (mean ± SE; 17 forests) of their photosynthates for plant biomass production (BP), while forests with low-nutrient availabi...
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