|
|
|
| Characteristics of vegetation with natural restoration in removal lands in loess hilly-gully region and the relationship between the characteristics and soil environment |
| Ma Xianghua 1,2,3 , Jiao Juying 1,2 |
| 1.Institute of Soil and Water Conservation,Chinese Academy of Sciences and Ministry of Water Resources; 2. Northwest Sci-tech University of Agriculture and Forestry: 712100, Yangling, Shaanxi; 3. Graduate School of Chinese Academy of Sciences, 100039, Beijing: China |
|
|
|
|
Abstract To supply vegetation restoration and reconstruction of removal lands in loess hilly-gully region with scientific basis, based on the data of Ansai in the typical loess hilly-gully region, the vegetation communities were analysed using hierarchical cluster analysis and step by step regression procedure to classify the stages of vegetation succession with natural restoration and quantitatively determine the relationship between the communities and soil environmental factors. The results showed that the stages of succession on removal lands as follows: Artemisia secoparia community-Leymus scalinus community-Stipa bungeana community Artemisia gmelinii community、 Lespedeza daurica community-Bothriochloa ischaemum community. Rich indexes of Gleason and Margalef and Pielou index decrease with removal time passing by at first and then increase, Simpson index is relatively bigger at the early and later balance stages, and the trend of ecological dominance of the communities is opposite to that of species rich index. The contents of soil organic matter, total N, available N and readily available K increase and that of readily available P and soil PH value decrease in the process of succession. Soil surface density decreases and soil porosity increases.There is very significantly positive correlation between the contents of total N, available N, soil pH value in the layer A and the contents of total N in the layer C and species richness, and there is very significantly negative correlation between the contents of soil organic matter in the layer A,C and the contents of soil readily available K in the layer B and species richness. There is very significant and positive correlation between the contents of soil readily available P in the layer B and ecological dominance of the community. There is very significant and positive correlation between the contents of soil readily available K in the layer A,B and vegetation coverage, and the relationship between the contents of soil readily available P in the layer B and vegetation coverage is on the contrary.
|
|
Received: 20 October 2004
|
|
|
|
|
|
|
