Soil geochemical characteristics and influencing factors in Beijing Plain
LI Huan1(), HUANG Yong1, ZHANG Qin-Rui1, JIA San-Man1, XU Guo-Zhi2, YE Bei-Bei3, HAN Bing1
1. Beijing Institute of Geo-exploratin Technology,Beijing 100120,China 2. School of Gemology and Material Technology,Hebei GEO University,Shijiazhuang 050031,China 3. Nuclear No. 247 Party of Tianjin North China Geological Exploration Bureau,Tianjin 301800, China
This study was based on soil geochemical survey data obtained in Beijing plain. The methods of mathematical statistics, factor analysis, correlation analysis and regression analysis were used to study the horizontal and vertical distribution characteristics of soil elements, and the influencing factors were discussed. The result shows that the content of CaO, MgO, Na2O, Hg, Cd, Sr, Ba, and Sn in soil is high and that of Sb, As, Th, W, Br, U, I, Mo and organic matter is low. The result of R-type factor analysis shows that factor F1 reflects the characteristics of the original soil background, factor F2, factor F4 and factor F6 reflect the influence of human activities on the distribution characteristics of soil elements, factor F3 reflects the basic information of soil parent material, and factor F5 reflects the basic characteristics of soil parent rock. The vertical distribution characteristics of elements were modeled by regression analysis. The regression coefficient R2 is 0.542~0.960, and the effect is good. From the regional scale, it is preliminarily determined that the depth of human activities on Cu, Hg, Pb and Zn is 150~200 cm, and that on N, P, S, Se, and organic matter is 50~100 cm. In general, the content of 39 elements such as Se, Bi, Li, organic matter, Mo and W in cinnamon soil is higher than that in alluvial soil.The relationship between the values of 29 elements such as As, Cd, Cr, Ni, N and B in different soil textures are in order of sandy loam<sandy clay loam<clay loam<loamy clay. The content of Cd, N, P and organic matter in cultivated soil is significantly higher than that in forest land. The content of harmful metals and nutrients in the soil of the central urban area is higher than that in the suburban area.
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