晋西北河保偏矿区土地利用变化对土地退化风险的影响

 采用基于光谱混合分析(SMA)的地表覆盖指数对晋西北河保偏矿区1990—2006年土地退化风险进行评价,并结合土地利用类型分析土地利用动态变化对土地退化风险的影响。结果表明:研究期内矿区的土地退化风险总体上呈降低趋势,未利用地的开发利用和生态工程实施是导致区内土地退化风险降低的主要原因;煤矿开采虽然对土地退化有一定的影响,但矿区发展所引发的区内土地利用结构的改变以及退耕还林等一系列生态工程的实施很大程度上能抵消这种负面影响。

Impacts of land use change on land degradation risk in He-Bao-Pian mining area of northwestern Shanxi Province

Land degradation risk has a close relation to land use types,land-use change will inevitably have potential impacts on land degradation.Here a surface cover index based on spectral mix analysis（SMA） is used to evaluate potential land degradation risk in He-Bao-Pian mining area of northwestern Shanxi Province during 1990—2006,and the impacts of land-use change on land are analyzed.The results show that the overall trend of land degradation risk is decreasing during the study period,the main reasons may be wasteland development and implementation of related ecological construction projects such as Grain for Green project.Coal mining generally has negative impacts on land degradation,however they are mostly offset by the land-use change caused by the development of mining industry and a series of ecological construction project in the study area.