黔中喀斯特地区不同植被土壤抗蚀性研究

Soil Anti-erodibility of Different Vegetation in Karst Area in Central Part of Guizhou

对黔中喀斯特地区石灰岩上石灰土在不同植被下的抗蚀性进行研究,运用土壤有机质含量、>0.25mm干筛团聚体含量、水稳性团聚体含量、结构破坏率、团聚状况、团聚度、分散率、分散系数8个指标进行相关性分析。结果表明:3种植被下土壤表层和亚表层的抗蚀性排序为阔叶林地>灌木林地>草地;从土壤表层到亚表层有机质含量下降剧烈;3种植被中阔叶林对增加土壤有机质含量有显著作用。土壤有机质含量和水稳性团聚体含量是评价土壤抗蚀性强弱的最好指标;结构破坏率、团聚状况、团聚度、分散率次之,>0.25mm干筛团聚体含量,分散系数两指标则不如其它指标明显。

Conducts the study to the central part of Guizhou karst area limestone lithological character limestone loam under different vegetation corrosion resistance,passes to the organic matter content,〉0.25mm big aggregation comparison content,water stable aggregate content,the disarrangement of the structure rate,the aggregation condition,the aggregation degree,the dispersion rate,the dispersion coefficient carries on the multi-targets analysis, during various targets carries on the relevant analysis,finally indicated： 3 vegetation by under soil surface layer and the second layer corrosion resistant broad-leaf forest〉Bush forest land〉the herbaceous place,at the broad-leaf mixed forest is descend of from the soil surface layer to second surface layer the organic matter content descend violent,explain broad-leaved forest to hand over to increase an organic matter content of soil to have already shown a work to use.Simultaneously obtains in this area reunites the body content with the soil uimin and the water stability to be most obvious for the target expression soil corrosion resistance;the structure breaking rate, the aggregation condition,aggregation degree,the dispersion rate is next,〉0.25mm big aggregation comparison,the dispersion coefficient two targets was inferior to other targets obviously.