نتایج جستجو برای: telar forests
تعداد نتایج: 39425 فیلتر نتایج به سال:
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...
Most studies on frugivorous bat assemblages in secondary forests have concentrated on differences among successional stages, and have disregarded the effect of forest management. Secondary forest management practices alter the vegetation structure and fruit availability, important factors associated with differences in frugivorous bat assemblage structure, and fruit consumption and can therefor...
PRIMARY TROPICAL FORESTS ARE POWERhouses of biodiversity (1) but are rapidly declining in extent and are threatened even within some protected areas (2). As a result, non-primary forests, especially those that have been selectively logged, are becoming more important to conservation efforts. In the tropics, logging is almost always selective, targeting only certain commercially valuable tree sp...
EuroAmerican land use and its legacies have transformed forest structure and composition across the United States (US). More accurate reconstructions of historical states are critical to understanding the processes governing past, current, and future forest dynamics. Gridded (8x8km) estimates of pre-settlement (1800s) forests from the upper Midwestern US (Minnesota, Wisconsin, and most of Michi...
The Evergreen forest type develops along the Valdivian and North-Patagonian phytogeographical regions of the south-central part of Chile (38° S–46° S). These evergreen forests have been scarcely studied south of 43° S, where there is still a large area made up of old-growth forests. Silvicultural proposals for the Evergreen forest type have been based on northern Evergreen forests, so that the ...
Urban and peri-urban forests determine different habitat services for biodiversity according to their characteristics. In this study, we relate ecological characteristics of urban and peri-urban forests to forest bird species richness and we assess whether their effect changed over time due to the urban sprawl within the urban region of Milan, Italy. We analyse two periods (1998–2002 and 2010–2...
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