重庆缙云山典型林分林地土壤抗蚀性分析

对三峡库区重庆缙云山4种典型林分(针阔叶混交林，常绿阔叶林，楠竹林和灌木林)林地土壤的抗蚀性指标进行主成分分析，并以农地土壤作对照，研究表明，可将衡量土壤抗蚀性的13个指标压缩为7个最佳指标。用抗蚀性指标主成分分析综合指数表明4种林分林地土壤抗蚀性为：灌木林(45.51)>混交林(41.94)>阔叶林(32.65)>楠竹林(23.35)；重庆缙云山土壤从表层到底层抗蚀性能呈下降趋势（49.32,41.86,32.03,27.11）。通过模糊聚类分析可将重庆缙云山不同土地利用类型不同层次的19个土壤样本划分为抗蚀性强度不同的3类。

ANTI-ERODIBILITY ANALYSIS IN FOREST SOIL OF TYPICAL FORESTS IN JINYUN MOUNTAIN IN CHONGQING CITY

Principal component analysis (PCA) was used to study the anti erodibility of forest soil in 4 typical forests (mixed wood, broadleaf forest, bamboo forest and shrub forest), compared to arable land soil, in Jinyun mountain, Chongqing City, in Three Gorges Reservoir Areas. The result shows that the 13 anti erodibility indexes can be scaled down to the 7 optimal indexes. PCA comprehensive exponent of anti erodibility indexes shows that the order of anti erodibility: shrub forest (45.51) > mixed wood (41.94)>broadleaf forest (32.65)>bamboo forest (23.35), and that the anti erobility of soil in Jinyun mountain is in decreasing trend from topsoil to bottom soil (49.32, 41.86, 32.03, 27.11). The 19 soil samples in all soil layers in different land use types can be classified in to 3 sorts with different anti erodibility on the basis of fuzzy clustering analysis.