Clay and nutrient contents in sediment from the two shrub lands were higher than those from the bare lands(CK),and clay and nutrient contents from the Caragana korshinkii lands were higher than those from the Sophora viciifolia lands,which may be resulted from the influence of vegetation including above-ground and below-ground parts.

Based on the investigation of 40 sample plots of shrub community in August 2007,Badaling of Beijing and selecting 16 environmental factors,the shrub community could be divided into 10 types with the TWINSPAN(Two Way Indicator Species Analysis) method which was confirmed by DCCA(Detrended canonical correspondence analysis).