Temporal and Spatial Dynamics of Normalized Difference Vegetation Index on the Southern Slope of Qilian Mountains from 2000 to 2015

Abstract

MOD13A1 data of 500 m resolution of 2000-2015 years annual growth season (5-9months) is utilized, and the cumulative average method, average method, trend line are put into use to analyze of the dynamic features of NDVI in southern slope Qilian Mountains, and the 16A maximum value and the growth rate of NDVI are simulated. The NDVI increases significantly in the southern slope of Qilian Mountains, the increased area was 3589 km2, an increase of 14.95%. The growth rate is 0.018/10a. The area of NDVI reduction is 1131 km2, which is reduced by 4.71%. The area of NDVI increased by more than 2458 km2, accounting for 52.07%. The spatial variation of NDVI in the growing season showed a trend of increasing from northwest to Southeast; the annual changes of NDVI in the growing season showed a single peak, and the interannual variation showed a fluctuating trend.