- Copyright © 2015, Environmental & Engineering Geoscience
Zoige County (China) represents a typical fragile subalpine rangeland eco-environment with a severe land desertification problem. This paper aims at detecting land desertification change in Zoige County between 15 years by quantified remote sensing techniques with multispectral imagery. Landsat images acquired in 1994 and 2009 were analyzed by this methodology: 1) image preprocessing 2) using Spectral Mixture Analysis (SMA) to obtain precise sub-pixel classification results of land cover; 3) then using Change Vector Analysis (CVA) to conduct a multi-temporal comparison process. Change detection results indicated the land desertification conditions and vegetation re-growing conditions which represent the spatial-temporal change pattern of land desertification at Zoige County. After dividing out ecological regions based on change detection results, analyzing the driving factors of both land desertification conditions and vegetation re-growing conditions, specific suggestions for each ecological region are proposed, which can assist the development of environmental restoration measures and environmental protection measures at Zoige County in an effective way.