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Spatial correlation of extreme temperatures and vegetation changes in the watersheds of Iran
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Javad Momeny damaneh    , Mohammad Tajbakhsh fakhrabadi * , Javad Chezgy , Ehsan Tamasoki |
| Associate Professor, Department, of Watershed Management, Natural Resources Faculty, University of Birjand, Birjand, Iran, Email: tajbakhsh.m@birjand.ac.ir |
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Abstract: (638 Views) |
| Changes in extreme climatic phenomena, such as long periods of hot days or heavy rains, have a much greater impact on human societies and the environment than changes in climatic averages. This study aims to investigate and analyze the risks of temperature threshold data and its relationship with changes in the vegetation index in Iran's six watersheds. In this research, the monthly rainfall data of 80 synoptic stations with at least 30 years of the statistical period from 1988 to 2017 were used, and the value of the standardized precipitation index (SPI) was calculated in eight months until the end of May. It was estimated in three-time intervals of ten years. The findings show that there is a significant spatial correlation between the vegetation cover index and the ground surface temperature values in Iran, which indicates the increasing trend of the vegetation cover index. The reports of Iran's Natural Resources and Watershed Management Organization indicate that in the last 30 years, we have increased the level of agriculture (rainfed and irrigated) in the country, along with the reduction and destruction of natural areas. This increase has neutralized the effect of the decreasing trend of pastures and forests in the spatial average of the vegetation cover index. The achievement of the upcoming research is worthy of consideration in the sense that it shows that the increase in the greenness of the country is a false result and can diminish the trend of natural areas (forests and pastures) in the analysis. Finally, if the land use change continues in the country, and droughts intensify with the decrease in rainfall and the increase in temperature extremes; The country will move towards increasing desert areas and land destruction. To prevent the wastage of water in the country's watersheds, the effect of drought should be reduced by implementing watershed measures and comprehensive management of watersheds. |
Article number: 3 |
| Keywords: Limit temperatures, vegetation index, standard precipitation index, watersheds |
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Full-Text [PDF 1695 kb]
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Type of Study: Research |
Subject:
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