Abstract:

In order to analyze the soil physiochemical and vegetation phytocoenological characteristic of sloping-land with purple soils in Hengyang. Firstly, by using the space series to replace time courses, 3 typical sample plots standing for 3 different successive stages were chosen and then field surveys and experimental analysis were used to detect the relationship between spatial changes of vegetation roots and soil environmental factors under different succession process of the main plant communities in natural restoration succession process in sloping-land with purple soils in Hengyang. The results showed that: (1) the soil physiochemical characteristic were that the north-facing slope was better than the south-facing slope, the down-slope was the best, the middle-slope was the better and the upper-slope was the worst; (2) There was a different plant community type in each position, such as the upper-slope, middle-slope and down-slope of the north-facing slope and south-facing slope and the sequence of the coverage degree and the bio-diversity indexes were: the down-slope on north-facing slope＞the down-slope on south-facing slope＞the middle-slope on north-facing slope＞the middle-slope on south-facing slope＞the upper-slope on north-facing slope＞the upper-slope on south-facing slope; (3) The relation between the each environmental condition and the vegetation coverage degree corresponded to the equality: Y=10.234X-4.5867(R2=0.8932); (4) The relation among the richness(S), Simpson index(D) and Shannon-wiener index(H) in each environmental condition corresponded to the equality: S=-0.0579+0.2367D+0.3579H, r=0.9147(P＜0.01); (5) The likeness index of different plant communities fluctuated up and down, and the trend of change matched the equality: Y=0.1268X+0.087(R2=0.8699). This study will to some degree enrich and broaden the vegetation ecology and restoration ecology of this area and provide theoretical basis for the vegetation recovery and reconstruction of ecosystem in sloping-land with purple soils in Hengyang.