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Ecological Environment Characteristics of the Soil around Qinghai Lake under the Influence of Human Activities

TIAN Yu-ming1,4,WU Feng2,ZHANG Ling3,LI Fu-chun3,CAO Jun-ji2(1.Central South Bureau of China Metallurgical Geology Bureau,Wuhan 430081,China;2.State Key Laboratory of Loess and Quaternary Geology,Institute of Earth Environment,Chinese Academy of Sciences,Xi'an 710075,China;3.College of Resources and Environmental Science,Nanjin Agricultural University,Nanjin 210095,China;4.Faculty of Earth Resource,China University of Geosciences, Wuhan 430074,China)  
By analyzing the physical properties(silt/clay ratios,bulk density and compaction),nutrients(N,P and K),organic matters and heavy metals(V,Cr,Mn,Co,Ni,Cu,Zn,As and Pb) of the soil samples collected from the surrounding area of Qinghai Lake,this paper reveals that current human activities have little effect on the physical properties of the soil in the area concerned;the total potassium content of the soil is stable,the phosphorus content increases with farming and grazing,and increasing human activities in the area lead to carbon loss;and the concentrations of heavy metals(Zn,As and Pb) in surface soil are greater compared with those of parent materials,and the difference among the enrichment factors of different types of soil is not obvious,which suggests that the enrichment of heavy metal is not the direct result of human activities in this area,but the increase of the background values of heave metals in the region.
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