نتایج جستجو برای: ecological conditions
تعداد نتایج: 935412 فیلتر نتایج به سال:
Discusses the interaction between socio-economic systems and their natural environment, by examining the indicators of sustainable development. Areas covered by the operationalization of sustainable development indicators; Details on the global nature of environmental problems; Important strategy of the operationalization of sustainable development; Link between economic data and ecological ind...
Study on land ecological safety has become a forefront topic of regional sustainable development. The paper constructed an evaluation index system of land ecological safety. Then it discussed the ranges of indexes corresponding to each evaluation grade. Considering the illegibility and uncertainty in land ecological safety evaluation, the paper combined fuzzy matter-element and entropy method t...
the endocarp of celtis australis l. with hyrcanian forests of northern iran and arid mountains of northern africa ecotypes were studied considering macro and micro morphologic characteristics, using binocular and scanning electron microscope. the aim of this research was to evaluate the endocarp diversity in different ecological conditions. the results showed that celtis australis l. is bigger,...
Ecological conditions are expected to have an important influence on individuals' investment in cooperative care. However, the nature of their effects is unclear: both favorable and unfavorable conditions have been found to promote helping behavior. Recent studies provide a possible explanation for these conflicting results by suggesting that increased ecological variability, rather than change...
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