岩溶山区植被破坏前后土壤团聚体稳定性研究

用C-D试剂浸提和浸泡振荡处理两种方法分析了岩溶地区不同土地利用方式和植被类型土壤的水稳性团聚体变化情况。利用方式和植被类型对土壤团聚体的形成有较大影响，不仅影响到土壤表层团聚体的组成和质量，而且对表层以下不同深度的土壤团聚体特征均有较大影响。土壤中游离氧化铁铝对提高土壤团聚体稳定性影响也表现显著，但浸泡振荡处理后水稳性团聚体含量的下降大于C-D试剂浸提处理。

The features of soil water-stable aggregate before and after vegetation destruction in karst mountains

The distribution and formation of soil water-stable aggregates under different vegetation types in Karst Mountains has been studied after two treatments with C-D reagent, drenching and vibrating in water for 30 minutes. Vegetation types and land-use time durations have a great influence on the formation of soil aggregates, they could influence not only the quality and quantity of aggregate composition in surface-layer soil, but also the characteristics of soil aggregates under the surface layer. Free Fe and Al oxides have a obvious influence on the water stability of soil aggregates, but the decreases of water-stable aggregate contents treating with drenching and vibrating are bigger than that treating with C-D reagent.