喀斯特地区植物根系对土壤元素迁移的影响

Influence of Plant Roots on Migration of Soil Elements in Karst Area

采用土柱淋滤试验,研究了乔木、灌木和草本的根系对土壤中钾、氮、钙元素迁移强度的影响。结果表明,不同植物根系对钾、氮、钙元素的迁移都有一定的活化效力,灌木与乔木的根系对钾、氮、钙元素迁移的活化效力比较接近,而草本的活化效力较弱;不同植被根系在土层(H)0≤H<10 cm中活化效力较弱,在土层10 cm≤H<30 cm中活化效力较强。

An soil column-leaching test was conducted to study the influences of root systems of arbor,shrub and herb on the leaching of K,N and Ca from soil columns.Result shows that the root systems of different types of plants all exhibit definite activation efficacies on the migration of K,N and Ca.The activation efficacy of arbor roots on the element migration in soil profiles is the highest,followed by shrub roots and grass roots in order.And the roots in the 10-30cm soil layers are more effective in promoting the leaching of K,N and C than those in the 0-10cm soil layer.