| The restoration and reconstruction of degraded ecosystem has become one of the focused problems of modern ecology. However, the whole process lacked the systematic study about biology characteristic of soil quality during the southwest degraded Karst vegetation restoration. Therefore, this paper took the soil during degraded Karst vegetation restoration of Ecological Synthesis Control demonstrated area in Huajiang Karst plateau of Guizhou as research object. We studied some indexes of soil biology characteristic of different vegetation restoration stages and different layers. At the same time,soil quality evaluation index system was established on the basis of physical and chemical characteristic. This study not only enriched restoration ecology, but also provided scientific proof of soil microbiology for vegetation restoration and reconstruction of degraded ecosystem in south Karst mountain area. The main study results were as following:(1)The soil biology characteristic, including enzyme activity, microbial biomass and basal respiration, decreased from slope farmland to herbaceous community, and increased from herbaceous community to arboreal community. From shrubby community to arboreal community,all indices have no obvious changes. It was indicated that at the early stage of plant restoration, different plant types could affect soil biology characteristic significantly, after a restoration stage, this affects not obvious any more, all indices tended towards stability.(2)The research results of soil enzyme activity, microbial biomass and basal respiration indicators in the soil profile indicated that:These indices had the similar vertical change characteristic. They was weaken with the soil layer depth increasing, performing the vary characteristic of 0-1Ocm> 10-20cm.(3)In this study, the system of soil biological evaluating indicators that degraded Karst vegetation restoration affected on soil biological characteristics was based by applying method of statistical analysis. The result showed that the soil biology indicators, including the unease, phosphatase, catalase, microbial biomass P, played a very important role to evaluate soil biological fertility quality; But the effect of invertase, microbial biomass C,N and basal respiration on evaluating soil biological fertility quality was smaller.(4) The sequence of soil biological fertility quality of different recovery stages evaluated by soil synthesis fertility index value (IFI)from high to low was 0-10cm of arboreal community> 0-10cm of shrubby community> 0-10cm of slope farmland> 10-20cm shrubby community> 10-20cm of arboreal community> 10-20cm slope farmland> 0-10cm herbaceous community> 10-20cm herbaceous community. The result of this index appraisal system was the same as the actual situation. |
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