نتایج جستجو برای: land fragmentation
تعداد نتایج: 151571 فیلتر نتایج به سال:
The conversion of tropical forest ecosystems to agro-pastoral ecosystems and other land uses continues unabated in Latin America. The present document constitutes a comparative study in which the degree of forest fragmentation through a 23-year period (between 1973 and 1996) was evaluated in two areas located within the same ecological region, but in two different countries (Colombia and Ecuado...
Land use and land cover change is driven by multiple influential factors from environmental and social dimensions in a land system. Land use practices of human decision-makers modify the landscape of the land system, possibly leading to landscape fragmentation, biodiversity loss, or environmental pollution-severe environmental or ecological impacts. While landscape-level ecological risk assessm...
Land use change is certainly the most important factor that affects the conservation of natural ecosystems, resulting the conversion of natural lands such as forests and pastures into agricultural, industrial and urban areas. Despite numerous studies investigating landscape patterns due to land use change, the driving forces of landscape change has been less studied in Iran. In this study, Arti...
small farm landholdings couples with scattered plots have created a major challenge in agricultural development in iran. land fragmentation provides an appropriate strategy to overcome current problems in iranian farming systems. therefore, the purpose of this qualitative study was to shed light on development pathologies in terms of land rehabilitation, reconsolidation, and improvement in mian...
As a local environmental issue with global importance, land use/land cover change (LUCC) has always been one of the key issues in geography and environmental studies with the expansion of regional case studies. While most of LUCC studies in China have focused on urban land use change, meanwhile, compared with the rapid change of urban land use in the coastal areas of eastern China, slow but dis...
: بر اساس تحقیقات صورت گرفته، ترکیبات گیاهی دارای اثرات فارماکولوژی و دارویی فراوانی هستند. در این تحقیق، پودر ریشه گیاه prangos uloptera با دستگاه سوکسیله، توسط حلال های n-hexan، dichloromethan و methanol عصاره گیری شد. عصاره متانولی درفشارپایین ودردمای o45 سانتی گراد قرارگرفت تانهایتا یک ماده صمغی شکل مشاهده شد. بخشی از این ماده به وسیله کارتریج spe-c 18 و با استفاده از محلول هایی با غلطت ها...
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