不同放牧方式对岩溶区土壤养分的影响——以广西桂林岩溶区实验基地为例

Influences of different grazing methods on soil nutrients in karst areas—A case study of the test base of the Guilin karst region,Guangxi,China

根据实验数据,探讨了不同放牧方式对岩溶区土壤的肥力、微量元素含量、水涵养性等的影响。结果表明,在正常放牧的情况下,能迅速提高牧草区土壤的养分和水的涵养性,减少水土流失,灌木种植初期不宜进行放牧;而在人为破坏和过度放牧的情况下,可在短期内导致岩溶区生态环境向着恶化的方向演替,土壤养分的各项指标下降到甚至低于未修复前的状态。

Influences of different grazing methods on the fertility of soils, content of trace elements and water nutrient conservation of soils in karst areas are studied on the basis of test data in the paper. The results show that： in the case of normal grazing, the nutrients and water nutrient conservation of soils in herbage districts can be improved rapidly and soil erosion can be reduced by using different grazing methods, but it is not advisable to graze in the primary stage of shrub planting; however, under the conditions of human disturbance and overgrazing, the ecological environment in karst areas may deteriorate in a short term and various indices of soil nutrients will fall even to the level lower than that of the beginning.