نتایج جستجو برای: zayandeh rood basin
تعداد نتایج: 57267 فیلتر نتایج به سال:
We investigate the evolutionary history of the wide-ranging Nearctic treefrog Hyla arenicolor through the integration of extensive range-wide sampling, phylogenetic analyses of multilocus genetic data, and divergence dating. Previous phylogeographic studies of this frog documented a potential signature of introgressive hybridization from an ecologically and morphologically divergent sister spec...
1- Introduction Watershed describes an area of land that contains a common set of streams and rivers, which all drain into a single large body of water. For sustainable management of watersheds, soil erosion is a major factor, which accelerates the rate of land degradation and hence influences agricultural productivity, run off movement and sometimes leads flood in the lower basin. Soil is one...
Determination of landscape evolution is useful to well understand the physical environment and it also enables us to conduct the soil related studies. The objective of this study was to establish the historic evolution of Zayandeh-rud Valley from late Tertiary to Quaternary. To achieve this objective, the spatial structure of a representative area of Zayandeh-rud Valley in three dimensions was ...
introduction there is a special competition among many metropolitansfor improving physical and semantic quality of urban landscape to upgrade their positions in global level and attract more tourists. based on such characteristics, one of the important goals of metropolitan management planners of the society is to develop open populated spaces and make leisure centers. urban spaces development ...
Optimum rice population densities and the response of rice yield and yield components to population densities and planting pattern are important factors helping rice producers and researchers to achieve maximum productivity. For this reason, a randomized complete block design experiment was conducted during the summer of 1995 at Isfahan University of Technology Research Farm located at Lavark, ...
s: 30–31.Richter, B.D., Mendelson, M.A. & Master, L.L. (1997a). Threats to imperiled freshwater fauna.Conservation Biology, 11: 1081–1093. Richter, B.D, Baumgartner, J.V., Wigington, R. & Braun, D.P. (1997b). How much water doesa river need? Freshwater Biology, 37: 231–249.Riley, A.L. (1998). Restoring Streams in Cities: a Guide for Planners, Policymakers, and Citizens. Washingt...
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