太行山主要植被类型根系分布及对土壤结构的影响

Root Distribution and Impact on Soil Structure of MajorVegetation Types in Taihang Mountain

对太行山五种主要植被类型的根系分布及其改善土壤孔隙状况的效果进行了调查，结果表明乔、灌、草７０％以上的根系分布在０ｃｍ～２０ｃｍ深的土层中，因而该土层土壤容重比荒坡降低１５．０４％～３６．１５％，且在土壤总孔隙度提高的基础上，土壤的非毛管孔隙度占总孔隙度的比例与荒坡相比平均提高４．５０％～６．３７％，深度大于２０ｃｍ的土层亦有所改善。植被对土壤孔隙状况的改良效果，阳坡以野皂荚为好，阴坡以虎榛子为好。

The root distribution of 5 major vegetation types in Taihang Mt.and its effects on improving soil porosity were investigated.The results are that over 70% of roots of trees,shrubs,and herbs distribute within 0cm to 20cm soil horizon,whose unit weight therefore reduces than that on barren slopes by 15.04% to 36.15%,and ratio of non-capillary porosity to total one also increases 450% to 637% on the basis of soil total porosity increasing.The structure of soil under the layer has improved to some extent.In the matter of vegetation's effect on improving soil porosity,the chinese honey locust is best in south slopes,and Ostryopis davidiana in north slopes.