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The Spatial Distribution and Influencing Factors of Farmland Heavy Metals in the Cold Black Soil Region: A Case of HailunCounty

SONG Heng-fei;WU Ke-ning;LI Ting;SHI Wen-ya;LIU Hao-ran;School of Land Science and Technology, China University of Geosciences,Beijing;Key Laboratory of Land Consolidation and Rehabilitation, Ministry of Land and Resources;  
Heavy metal pollution of farmland soil has attracted a great attention for a long time. To scientifically reveal its spatial differentiation characteristics and influencing factors is an important part of arable land quality management.The spatial distribution characteristics of eight heavy metals were obtained with the method of IDW interpolation in Hailun City. Geographical detector was used to diagnose explanatory powers of natural, locational, production and living factors. The results showed that the variation degrees of Cr, Cu, Ni, Pb and Zn were greater than those of As, Hg and Cd. All of them had significant but different spatial gradient variations from northwest to southeast. Each factor had its unique mechanism that affected the spatial heterogeneity of heavy metals differently. The main influencing factors of Hg, Cd, Pb and Zn were location and nature, while those of As, Cr, Cu and Ni were location, production and living. In general, the influences of location factors were greater than those of production and living factors, and the influence of natural factors wasthe smallest. Affected by intense human disturbances, the inherent contents of soil heavy metals were shaped into a new spatial arrangement.
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