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作 者 ：刘方,王世杰,刘元生,何腾兵,罗海波,龙健

期 刊 ：生态学报 2005年 25卷 3期 页码：639~644

关键词：喀斯特；石漠化；土壤质量；环境影响评价；

Keywords:karst, rocky desertification, soil quality, environmental impact evaluation.,

摘 要 ：通过对贵州中部喀斯特地区进行植被调查与土壤样品分析 ,探讨石漠化过程中土壤质量变化及其对生态环境的影响。结果表明 :喀斯特石漠化过程中随着植物群落退化度的提高 ,土壤出现粘质化 ,有机质含量急剧下降 ,植物可利用的养分含量减少 ,提高了石漠化对生态环境影响的潜能 ;随着植被覆盖率下降、土地垦殖率增加 ,引起土壤质量明显退化 ,加剧了石漠化发生的强度和速度。石漠化区土壤有机质、物理性粘粒、有效氮磷钾含量与植被覆盖率、土地复垦率有显著的相关性 ,以这些参数作为评价指标 ,初步将喀斯特石漠化过程中土壤质量变化对生态环境潜在影响的程度分为 3个等级。

Abstract:In the karst areas of southwestern China, carbonate rock covers about 336000 km~2. The geological environment is extremely fragile, the area is also overpopulated and the economy is backward. This has led to serious land degradation in the form of karst rocky desertification. Karst rocky desertification is a process of land degradation involving serious soil erosion, extensive exposure of basement rocks, drastic decrease in soil productivity, and the appearance of a desert-like landscape. It is caused by ir...

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