Paper Keyword
drought monitor, Ts-NDVI space, vegetation cover, the Monglian Plateau, NDVI
Abstract
The vegetation degradation, drought and other environmental issues in the Mongolian Plateau have been as the hot spot in the study of the climate change and the ecological environment changes in Northeast Asia. However, it is lack of study focused on the extraction information of vegetation cover changes, building the stable drought monitoring model and their spatio-temporal differences between Mongolia and Inner Mongolia. Based on the NOAA AVHRR NDVI-PathFinder 10d remote sensing data of 1981-1999 and MODIS vegetation index and the surface temperature 16d data of 2000-2012, the study inverted Fractal Vegetation Cover (FVC) by the two sub-pixel model, and Temperature and Drought Vegetation Index (TVDI) by the Ts-NDVI general space, their spatio-temporal distribution and changes were studied. The main conclusions are as follows: (1) The inverted FVC and TVDI based on NOAA AVHRR NDVI-PathFinder and MODIS data, could explain the macro spatio-temporal distribution and changes of vegetation cover and drought. (2) The vegetation cover and drought in the Mongolian Plateau has obvious zonal distribution, and closely related with the Land Use/Land cover types. (3) Drought is common in the Mongolian Plateau, and it is severe drought in some years.(4) There is close relation between soil moisture and vegetation cover, Land use.(5) From 1981 to 2012, the vegetation cover showed unobvious decrease in the Mongolian Plateau, the decrease of vegetation cover in Mongolia is the main part. (6) There were differences between the changes of FVC and TVDI in different regions of different Land Use/Land Cover.
