喀斯特退化生态系统不同恢复阶段土壤质量研究

Karst is one of the weakest kinds of ecological environments and one of the main factors that restricts economic development in south-west China.And restoring vegetation and improving soil quality is among urgent affairs of the region.It is very important to explore the effects of different succession stages on soil quality for the restoration and management of karst degraded mountain.In this study,three succession stages in karst degraded mountain were selected at the Baimiao Mountain in Beibei of Chongqing.The three succession stages are grass stage,brush stage and forest stage.The paper reported the responses of 15 indicators including the Shannon-Wiener index,soil physical and chemical properties to the three succession stages.In addition,the index of soil quality was analyzed.Results showed that: different succession stages led to significant differences in the Shannon-Wiener index and soil physico-chemical properties.The soil quality of the three succession stages was ranked as follows: brush stage>forest stage>grass stage,and the same rule to the Shannon-Wiener index.In brush stage, soil bulk density,soil water,water holding capacity,capillary porosity,soil porosity and air porosity were significantly lower than those of two others,and soil organic matter,nitrogen and phosphorus as well.