نتایج جستجو برای: hyrcanian plant
تعداد نتایج: 395293 فیلتر نتایج به سال:
forest types mapping, is one of the most necessary elements in the forest management and silviculture treatments. traditional methods such as field surveys are almost time-consuming and cost-intensive. improvements in remote sensing data sources and classification –estimation methods are preparing new opportunities for obtaining more accurate forest biophysical attributes maps. this research co...
Many pozzolans are waste products from industrial processes. Every year a huge amount of coal is gathered the washing plant in Hyrcanian forests Iran. These materials can be used for soil stabilization construction and maintenance projects forest roads. This paper aims to (a) investigate role (CW) as stabilizer (b) determine changes specification regarding environmental pollution different comb...
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...
the effects of initial spacing layout on some allometric characteristics of 12-year-old quercus castaneifolia trees grown in central mazandaran, north of iran were examined. trees were planted in 5 different layouts (1?1, 1.5?1.5, 2?2.5, 2?3 and 4?4 m). tree height, diameter at breast height, natural pruning height and the survival of trees were recorded in each sample plot. tree basal area and...
this research develops an allometric model for estimation of biomass based on the height and dbh of trees in the hyrcanian forests of iran. an accurate allometric model reduces the uncertainty of allometric equation in biomass estimation using radar images. in this study, 317 trees were selected randomly from the 4 different dominant tree species for the development of an allometric model cover...
Besides Quercus, Acer L. genus is the largest tree in Northern Hemisphere and consists of about 124–156 species. High morphological molecular variability has led to infra-specific complexity within most species this genus. In Iran, cappadocicum subsp. Gled. distributed eastern western parts Hyrcanian forests. study, three leaf-morphotypes A. were identified during sampling a forest located regi...
chestnut-leaved oak (quercus castaneifolia c. a. mey) is one of the most important native oaks of iran distributed in the hyrcanian forests. the pure and mixed stands of it cover about 6.5% of these forests. the species represents morphological variations which have resulted in the description of several infraspecific taxa by different authors. eight taxa were recognized as subspecies and varie...
the relocation of nutrients and water fluxes to the forest floor varies spatially due to partition of rainfall into throughfall and stemflow by tree canopies. in this study, nutrient concentrations of rainfall and stemflow were measured for seven rainfall events in chaboksar area in the hyrcanian ecozone of iran composed of juglans regia linn and cup. sempervirens l. var. fastigiata where such ...
carex humilis leyss. از تیره اویارسلام برای اولین بار از ایران و منطقه فلورا ایرانیکا گزارش می شود. این گیاه از جمله گیاهان مناطق مرتفع کوهستانی در گیلان است که در ارتباط با مطالعه اکولوژیکی این مناطق جمع آوری شده است. یادداشت های تاگزونومیکی و پراکنش این گونه ارائه شده است.
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