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| The vegetation series along slopes on the Hilly-gullied Region of Loess Plateau |
| Jia Yanfeng1,2,Wang Ning1,2,Han Luyan1,2,Jiao Juying1 |
| 1.Institute of Soil and Water Conservation,CAS & MWR,NWSUAF,712100,Yangling,Shaanxi;2.Graduate School of the Chinese Academy of Sciences,100049,Beijing: China |
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Abstract Vegetation series explains influence of micro-landform on the vegetation distribution.Two north-south sections,a short slope with deep gully section and a long slope with shallow gully section,in Guaigou of Zhifanggou watershed in Ansai county were investigated by line transection.Then,the characters of vegetation series,composition and diversity of vegetation were analyzed.The main results are as follows: there are more herbs on the long slope with shallow gully section,while,on the short slope with deep gully section,there are more shrubs and trees,which are the main species of later community.And on the same section,the communities of the shade and gully region are more complex.Species of Compositae,Leguminoseaea and Gramineae composite of all most species,perennial herbs is the dominant life-form,and xerophyte and mesoxerphyte are the main water ecotype.The α diversity of the shade slope and the short slope with deep gully section is higher,while the β diversity is higher at erosion front of gully.Based on all above,suggestions of vegetation restoration are given.
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Received: 25 January 2008
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