Studies On The Species Diversity Of Community Among Various Vegetation Restoration For Purple Soil Hilly Area In Heng-yang

The problem of soil erosion and difficulty of plant recovery was more and more serious in purple soil area.For the purpose of ecological restoration and from the standpoint of biological diversity,in this study, effect on biological diversity of different vegetation has been discussed, then find the best restoration of vegetation types.It was valuable to provide advisory for plant recovery in the hilly areas in hunan province.The results of this study as follows:1. As the pioneer species to binata, combined with a variety of mixed planting of trees and shrubs of vegetation, the tree layer diversity index increased to more than 15%, the number of species increased13%, the number of individual plants increased to nearly 12%, after years practice.We can see that such a recovery mode has a good effect to improving biological diversity.2. Vegetation increased soil microbial diversity significantly. Five vegetation recovery patterns increase the number of microbes in soil, biomass and enzyme activity in different levels. The number of microbes were hoisted by 51.9 times at the highst level and 1.9 times at the lowest level, Soil microbial biomass were enhanced by 6 times at the highst level and 1 time at the lowest level, activites of enzyme were enhanced by 64.1 times at the highst level and 2.3 time at the lowest level, land reform effect is obvious.3. Correlation between Plant diversity, soil microbial diversity and enzyme is obvious. Positive correlation index between the three are up to 0.9, is very obvious. It is easy to see that plant diversity can hoist the level of microbial diversity and enzyme activity, microbial diversity and activity increasing, can promote the improvement of plant species diversity in turn, thus forming a virtuous circle of land,it has a deeply inflence in plant recovery in purple soil area.4.The vegetation of binata and shrubs has a better effect in enhancing diversity and microbial diversity than pure meadow vegetation recovery pattern and compound shrubs and herb vegetation.