南京紫金山灵谷寺不同林地土壤抗蚀性研究

为研究南京紫金山灵谷寺不同林分林下土壤的抗蚀性，对该区域内的4种植被（麻栎、枫香、白栎、桂花）林下土壤抗蚀性特征及其影响因素进行了研究。结果表明:不同林分土壤抗蚀性能存在明显差异，土壤抗蚀指数表现为桂花 > 枫香 > 麻栎 > 白栎。土层土壤抗蚀指数随深度增加而减小，有一定的规律性。发现本地区土壤抗蚀指数随浸水时间而减小，呈二次多项式函数关系，其通式为S=at²+bt+c。土壤中（> 0.25 mm）水稳性团聚体与土壤抗蚀指数在0.01水平上呈极显著正相关。对16个指标的主成分分析结果表明，总孔隙度、水稳性指数、团聚度、（> 0.25 mm）水稳性团聚体含量、有机质、全氮对土壤抗蚀性影响较强。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:桂花（0.24），枫香（0.08），麻栎（-0.13），白栎（-0.18）。

Study on Soil Anti-Erodibility in Different Forests in Spirit Valley of Mount Zijin in Nanjin

To study the soil anti-erodibility in spirit valley of Nanjing under different vegetation types, research the soil anti-erodibility and its impact factors under four vegetation types, such as Quercus acutissima Carr., Liquidambar formosana Hance, Osmanthus fragrans (Thunb.) Lour., Quercus fabri Hance in this area were examined. The results showed that there were significant differences in soil erodibility in different stands, the soil erodibility indexes decreased in the order:Osmanthus fragrans (Thunb.) Lour. > Liquidambar formosana Hance > Quercus acutissima Carr. > Quercus fabri Hance. The soil anti erodibility index decreased with increase of depth, and has certain regularity. It was found that soil erodibility index decreased with immersion time, showing two polynomial function relationship, the general formula is expressed as S=at²+bt+c. > 0.25 mm water stable aggregates in soil and soil anti erodibility index showed the significant positive correlation at the level of 0.01. The principal component analysis of the 16 indexes showed that total porosity, > 0.25 mm water stability index, aggregation degree, water stable aggregate content, organic matter and total nitrogen had strong effects on soil erodibility. The comprehensive index of soil erosion resistance was calculated, and the soil anti-erodibility of each forest land decreased in the order:Osmanthus fragrans (Thunb.) Lour(0.24) > Liquidambar formosana Hance(0.08) > Quercus acutissima Carr.(-0.13) > Quercus fabri Hance(-0.18).