基于RS和GIS的喀斯特石漠化驱动机制分析——以广西都安瑶族自治县为例

Diving Mechanism Diagnosis of Karst Rocky Desertification in Du'an Yao Autonomous County of Guangxi based on RS and GIS

喀斯特石漠化 (KarstRockyDesertification ,KRD)是指喀斯特区地表出现类似荒漠景观的土地退化过程。采用RS和GIS技术 ,对都安喀斯特石漠化程度分级状况与驱动因素进行全面调查 ,建立全县 1∶ 10万喀斯特石漠化数据库。利用相关分析、因子分析和回归分析等方法 ,分析导致石漠化的影响因子 ,即喀斯特石漠化的重要驱动力 ,建立了喀斯特石漠化动力指数模型 ,算出了各因子对石漠化的贡献值 ,指出石漠化产生的主导原因是不合理的人为活动。所建的动力指数模型输出结果与遥感调查有相对一致性 ,表明石漠化动力指数能较好地反映该地区石漠化过程 。

Karst Rocky Desertification (KRD) means the land degradation similar to landscape desertification in the karst area. Based on GIS and RS technique, the spatial distribution of KRD and driving factors is studied, and the 1∶100 000 map is made. The relationships between KRD and each factor are discussed, and then the system of influential factors indexes is built. Making use of the methods including correlation analysis, factor analysis and regression analysis,we have affecting factors of KRD,established index system,found the force index model.calculation of contribution of various factors for shows that the most important factor of is irrational human activity. The coinciderce between the model and RS survey that rocky Synthetic driving exponent can reflect rocky desertification procession of the studied area and provide theoretical foundation for rocky desertification regulation