tayebeh sohrabi; Abbas Ali Vali; Abolfazl Ranjbar Fordoei; sayed Hojat Mousavi
Abstract
Dust event is one of the secondary complications of ecosystem in arid and semi-arid areas. This phenomenon results from system feedback against multiple factors of pressure and destruction. One of the most important foundations of ecosystems is vegetation. Because the vegetation factor reflects many ...
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Dust event is one of the secondary complications of ecosystem in arid and semi-arid areas. This phenomenon results from system feedback against multiple factors of pressure and destruction. One of the most important foundations of ecosystems is vegetation. Because the vegetation factor reflects many factors in the ecosystem, therefore, the interaction of factors can be understood by studying the relationship between its changes and other factors such as dust phenomena. The aim of this study was to investigate the effect of vegetation and relationship with dust events in Esfahan province during 2000-2016 using Geographic information system and Normalized difference vegetation index. The data of dusty days in the region synoptic stations were provided from Meteorological Organization and the frequency of dusty days in different years were determined. Using the method of Normal Kriging in GIS; dusty days were zoned. Vegetation map was prepared based on NDVI in July for each year using MODIS image. The regression analysis of annual dust and vegetation index were also performed to quantitatively analyze the effect of vegetation cover on the occurrence of dust.The results showed. Vegetation cover has been the lowest during the study period in the east and center of the province. The NDVI was also the lowest in 2011-2012 and 2015, with a change from 0.69 to -0.19. The results showed significant correlation between the number of dust event and vegetation distribution
Hamid Reza Saeidi Goraghani; Ghodrat alah Heydari; Hossein Barani; Zakaria Alavi
Abstract
This study is trying to exploitations view point and permanent management problems of rangeland to evaluate in ranches Damavand Summer Rangeland in Amol County. Statistical Society are utilizations 15 ranch that with three methods, collective property, private property and council property from rangeland ...
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This study is trying to exploitations view point and permanent management problems of rangeland to evaluate in ranches Damavand Summer Rangeland in Amol County. Statistical Society are utilizations 15 ranch that with three methods, collective property, private property and council property from rangeland utilization and randomly from among their number 88 was selected. The research tool was a questionnaire that among exploitations through direct interviews have been completed. To assess problems permanent management of rangeland in the area with pivotal effect of the structure of exploitation methods, index nine selection and with spectrum from exploitations view point and were measured. The results showed different methods on among permanent management of rangeland effect means confidence level 99 percent. Duncan comparison test showed that permanent management problems private property exploitation methods are low from exploitation methods collective property and council property. So Friedman test results showed that with the rank category index of problems permanent management of rangeland time stop livestock mid excessive pasture with average 9.23 and the number of livestock over rangeland capacity in the region with average 8.01, respectively, the uttermost rank or impacts than the other indexes on rangeland permanent management in watershed land. So with use from Kruskal Wallis test evaluated and compared each one of rangeland permanent management indexes in exploitation different methods. Generally recommended to reduce problems in watershed areas of before Projects of reform and reducing, recognizing systems, common law and the demands of exploitation more attention and emphasis management and experts.
