退化喀斯特植被恢复过程中的土壤抗蚀性变化

运用时空互代法，以喀斯特山区不同植被恢复阶段为研究对象，坡耕地与人工林为对照，通过室内分析，采用主成分分析方法，探讨了其土壤抗蚀性。结果表明：土壤中有机质、>0.25 mm水稳性团聚体含量、<0.05 mm粉黏粒含量、<0.001 mm黏粒含量和结构性颗粒指数可以作为评价土壤抗蚀性的最佳指标。各样地土壤抗蚀性综合指数大小排序为灌草丛>乔灌过渡林>灌木林>乔木疏林>人工林>草坡>坡耕地。喀斯特山区，坡耕地土壤抗蚀性能最差；植被恢复过程中，土壤的抗蚀性能先逐渐变好，后逐渐变差，转折点在灌草阶段。以灌草搭配的植被恢复模式可能比较适合喀斯特地区。

Variation of soil anti-erodibility during restoration of degraded karst vegetation

Karst areas at different vegetation restoration stages were studied with slope farmland and artificial forest as control using the approach of substituting the temporal serial with spatial serial. And further through lab analysis using the principle component analysis method, variation of soil anti-erodibility was explored. Results show that the contents of soil organic matter, <0.001 mm clay, >0.25 mm water-stable aggregates and <0.05 mm silty clay and the structural particle index were optimal indicators for evaluating soil anti-erodibility. In terms of comprehensive anti-erodibility index, the lands at different vegetation restoration stages mixture of frutex and meadow thicket > mixture of arbor and frutex > frutex > arbor > artificial Chinese Cryptomeria stand > meadow thicket > slope farmland. Slope farmland was the lowest in soil anti-erodibility in the karst region. During the process of vegetation restoration, soil anti-erodibility improved and then deteriorated with the stage of mixture of frutex and meadow thicket as turning point, suggesting that, the model of mixture of frutex and meadow thicket is appropriate to vegetation restoration in karst regions.