苏南丘陵区主要林分类型土壤抗蚀性分析

以苏南丘陵区杉木、马尾松、麻栎、毛竹等4种林分土壤为研究对象,研究了该区域内不同林分类型土壤的抗蚀性。结果表明：不同林地土壤的抗蚀指数、抗冲指数、抗剪强度均表现出明显的规律性,即随着土壤深度的增加,呈减小的趋势;对不同林地土壤的抗蚀指数（S）随浸水时间（t）的变化过程进行拟合,发现本研究区内土壤的抗蚀指数与浸水时间呈二次多项式函数关系,其通式为S=at2＋bt＋c;选取土壤理化性质、土壤团聚体特征、抗冲、抗剪等17个指标,以主成分分析为基础,筛选出了土壤抗蚀性的最佳评价指标体系;计算各林地土壤的抗蚀性综合指数,得出各林地土壤抗蚀性由强到弱依次为：毛竹（1.33）,杉木（0.35）,麻栎（-0.75）,马尾松（-0.89）。

Analysis of soil anti-erodibility of main forest types in the south hilly region of Jiangsu province

This paper studies the anti-erodibility of four kinds of forest soil（Chinese fir（Cunninghamia lanceolata）,Masson pine（Pinus massoniana Lamb）,Quercus（Quercus acutissima） and Bamboo（Phyllostachys pubescens） in the South Hilly Region of Jiangsu Province.The results showed that the soil anti-erodibility index,impact index and shearing strength in different forest soil have significant regularity,that is,all the three indexes show a decreasing trend with the increscent soil depth.The relationship between the soil anti-erodibility index（S）in different forest soil and the immersion time（t） is a quadratic polynomial function,whose general formula is S=at2＋bt＋c.Based on Principal component analysis with 17 indicators including soil properties,soil aggregate characteristics,impact resistance and shear resistance,the best indicator system for evaluating the soil Anti-erodibility was reached;Calculating the soil Anti-erodibility index showed that the order of anti-erodibility of different forest soil is：Bamboo（Phyllostachys pubescens）（1.33）Chinese fir（Cunninghamia lanceolata）（0.35） Quercus（Quercusacutissima）（-0.75） Masson pine（Pinus massoniana Lamb）（-0.89）.