关键词: 光毒性, 光毒性

Abstract:

In order to analyze the change of the vegetation roots and soil physical and chemical characteristic of main plant communities in natural restoration succession process in sloping-land with purple soils in Hengyang by the quantitative analysis method. 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 pattern 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) there were corresponding changes in the ecological characteristics of plant communities and the soil physical and chemical characteristics with the succession process, in the succession initial stage, the succession middle stage, the succession end stage the ratio root to soil of 0-15 cm soil layer was 0.18, 0.15 and 0.12, respectively; (2) The spatial distribution pattern of roots changed with the succession process, the order of the soil quantity attached to roots was: the succession initial stage＜the succession middle stage＜the succession end stage, and the order of the ratio of root to soil of 0-15 cm was: the succession initial stage＞the succession middle stage＞the succession end stage; (3) There were corresponding changes in the spatial distribution pattern of plant roots (0-60 cm), the ratio of the roots to soil attached to them, the soil bulk density, the soil water contents with the succession process, and there was a certain corresponding relationship with the N content in soil.