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《Journal of Beijing Forestry University》 2007-01
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Distribution of biotic crusts and its influencing factors in the grain_for_green land of the loess region,northern Shaanxi Province.

JIAO Wen-jun~(1,2,3);ZHU Qing-ke~3;ZHANG Yu-qing~3;WU Xiu-qin~3;WANG Na~3.1 Institute of Geographic Sciences and Natural Resources Research,Chinese Academy of Sciences,Beijing,100101,P.R.China;2 Graduate University of Chinese Academy of Sciences,Beijing,100049,P.R.China;3 Key Laboratory of Soil and Water Conservation and Desertification Combating,Ministry of Education,Beijing Forestry University,100083,P.R.China.  
In order to scientifically evaluate the Grain_for_Green Project and its soil and water conservation benefit,as well as other ecological benefit in the loess region,a vegetation investigation was conducted from July to August,2005 in Wuqi County,Yan'an City,Shaanxi Province.By analyzing the data from 78 sample plots,we obtained the distribution laws of biotic crusts in the grain_for_green land of the loess region,and achieved some influencing factors,including disturbance degree,aspect,topographic position, slope degree,vegetation structure,vascular plants and microhabitat.Results showed that: 1) coverage of biotic crusts on slopes with a low disturbance degree is larger than that with a high one,larger on north_facing slopes than that on south_facing ones,and larger on gully_slopes than that on ridge_slopes;2) coverage of biotic crusts increases with the increase in coverage and species of vascular plants,but will decrease after a critical number of vascular plant species;and 3) coverage of biotic crusts in a herb_dominated vegetation structure is larger than that in a tree_dominated one,and that in a shrub_dominated one is the smallest.
【Fund】: “十五”国家科技攻关项目(2004BA510B01)
【CateGory Index】: S714
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