Document Type : Research Paper

Authors

1 PhD Graduate in rangeland management, Sari Agricultural Sciences and Natural Resources University, Sari, Iran.

2 Associate Professor, Faculty of Natural Resources, Sari Agricultural Sciences and Natural Resources University, Sari, Iran.

3 Professor, Faculty of Natural Resources, University of Tehran, Karaj, Iran.

4 Assistant Professor, Faculty of Natural Resources, Sari Agricultural Sciences and Natural Resources University, Sari, Iran.

5 Associate Professor, Faculty of Natural Resources, University of Tehran, Karaj, Iran.

Abstract

Plain ecosystem is highly vulnerable to environmental changes, and drought is the most famous ecosystem change driver that is difficult to identify after its occurrence. In this research, to study the slope of vegetation changes against drought, the NDVI index of MODIS images and the SPI index from 2001 to 2016 were used and the map of vegetation changes against drought with five drought stress classes included very low classes, Low, moderate, high and very high, so that a suitable assessment of the drought can be made at specified time scales. The results of slope pattern of spatial change of vegetation against drought showed that across the plain vegetation changes have declined, and from east to west of Qazvin plain, the slope of vegetation changes and land susceptibility to drought have been reduced. So that the most percentage of area in a one-month drought related to the drought class is very low, but in droughts of 3, 6, 9, 12, 24 and 48 months, the highest percent of the area belonged to moderate and high drought classes. The results of this study, the determination of the level of vegetation changes in against drought in the past years and prediction of these changes in the future years, can be used in the planning and optimal use of resources, control changes in the future.

Keywords

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