三峡库区典型林分林地土壤抗蚀抗冲性研究

通过对三峡库区重庆缙云山四种典型林分（针阔叶混交林，阔叶林，楠竹林和灌木林）林地土壤的抗蚀抗冲特征研究表明，林地土壤抗蚀指数为农地土壤的1.3~1.9倍。各林分林地土壤抗蚀指数的顺序为灌木林最大（78.4），阔叶林最小（53.3）。抗蚀指数随着土层的增加而减弱。林地土壤抗蚀指数与其相关因子毛管孔隙度，稳渗率，非毛管孔隙度，< 1 mm根长关系最密切。除楠竹林外，各林分林地土壤抗冲系数大于农地（1.2~1.9倍）。林地土壤抗冲性的强弱是其相关因子综合作用的结果。

Research on Forest Soil Anti-erosion and Anti-scour of Typical Forests in Three Gorges Reservoir Areas

The research on the forest anti-erosion and anti-scour characteristics of 4 typical forests(mixed wood,broadleaf forest,bamboo forest and shrub forest) in Jinyun mountain in Chongqing City in Three Gorges Reservoir areas shows that,the forest soil anti-erosion indexes is 1.3～1.9 times arable farmland,and the maximal is shrub forest(78.4) ,the minimal is broadleaf forest(53.3) .The anti-erosion index is lessening with the soil layer deepening.The anti-erosion indexes have close relations with soil capillary porosity,non-solid permeability,capillary porosity,length of 1 mm root.Except bamboo forest soil,other forest soil anti-scour coefficients are more than one of arable land(be 1.2～1.9 times) ,the anti-scour capacity is the result of mutual function of related factors.