岩溶山区不同土地利用方式对石灰土基本特性的影响

以重庆金佛山为例,针对岩溶山区不同土地利用系统,分析了土壤容重、孔隙度、质地、有机质、阳离子交换量等土壤基本特性对不同土地利用方式的响应.结果表明,由于土地利用强度不同,常绿阔叶林地土壤质量最优,耕地最差,退耕地的部分土壤特性得到恢复.土壤特性对不同土地利用方式的响应程度由高到低依次为有机质、阳离子交换量、黏粒含量、容重、孔隙度.有机质与阳离子交换量、机械组成的分形维数、容重和孔隙度均呈极显著相关,有机质是岩溶生态环境中石灰土壤质量演变的重要因子.

Responses of Basic Properties of Limestone Soil to Land Use in Karst Jinfo Mountain Area in Chongqing

Effects of land use on soil basic properties,such as soil bulk density,soil porosity,texture,organic matter,CEC,etc.,were studied with the Karst Jinfo Mountain Area in Chongqing as an example for case study.Results show that the effects varied with land use intensity.The soil quality of ever-green broad-leaf forestlands is the best,that of cultivated lands the worst,and that of farmlands yielded to afforestation improving.The responses of soil properties to land use displayed a decreasing order of soil organic matter>CEC>clay content>bulk density>soil porosity.Organic matter was found closely related to other soil properties and assumed to be an important factor affecting succession of soil quality of limestone soil in the Karst ecosystem.