1. Faculty of Geomatics, East China University of Technology, Nanchang 330013, China 2. Key Laboratory of Watershed Ecology and Geographical Environment Monitoring, National Administration of Surveying,Mapping and Geoinformation, Nanchang 330013, China 3. South Digital Technology Co., Ltd., Guangzhou 510665, China
Monitoring the spatial pattern and dynamic change of Karst rocky desertification has an important significance in Karst areas. In this study, the Karst rocky desertification evaluation model was established in Guizhou Province, which based on vegetation fractional coverage and degree of exposed bedrock using multi-temporal MODIS data, slope and population density as evaluation factors. The contribution of four factors was compared to accomplish the judgment matrix and calculate the weight by analytic hierarchy process. Karst rocky desertification evaluation model was established through consistency check. By this evaluation model, the spatial patterns of Karst rocky desertification and characteristics of conversion in different degree of desertification were acquired, the spatial-temporal evolution and dynamic change of Karst rocky desertification were analyzed in the period of 2007—2016. Some conclusions have been reached: ①Karst rocky desertification was improved dramatically from 2007 to 2016. The proportion of moderate rocky desertification and severe rocky desertification was 55.67% and 40.53% respectively in 2010 but was 79.71% and 17.35% in 2016. ②Moderate rocky desertification was the intermediary process of severe rocky desertification transform to light rocky desertification. It can firstly transform severe rocky desertification to moderate rocky desertification and then transform to light rocky desertification. ③Moderate rocky desertification and light rocky desertification were active, whereas severe rocky desertification was stable and the conversion rate was low.
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