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| Soil anti-erodibility of plant communities on the removal lands in hilly-gully region of the Loess Plateau |
| Zhang Zhenguo1,2,Fan Bian'e3,Bai Wenjuan1,2,Jiao Juying1,4 |
| 1.Institute of Soil and Water Conservation,CAS & MWR,712100,Yangling,Shaanxi;2.Graduate School of the Chinese Academy of Sciences,100049,Beijing;3.Institute of Agriculture Science,Xi'an,710061,Xi'an;4.Institute of Soil and Water Conservation,Northwest Sci-tech University of Agriculture and Forestry,712100,Yangling,Shaanxi:China |
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Abstract The study result on soil anti-erodibility in Wuqi County,Shaanxi Province,a national experiment site for conversion from cropland,into forest land and grassland showed that all the 12 anti-erodibility indexes can be divided into 4 categories,i.e.inorganic clay,aggregate,inorganic colloid and water-stable aggregate,capable of reflecting 88.671% of the information of the eigenvalues,by means of PCA.All the plant communities in Wuqi County can be clustered into three kinds based on the four categories with the Hierachical Cluster Method.The first kind with good anti-erodibility mainly includes forest land and grassland from cropland with a long removal time,and the second kind with medium anti-erodibility is composed of Artemisia,where as the third with poor anti-erodibility is made up of newly forest land and grassland removed from cropland and the cropland.The anti-erodibility of artificial forests is getting stronger and stronger as the forest ages,approaching that of natural forests.
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Received: 07 August 2006
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