title: Assessing the pollution risk of soil Chromium based on loading capacity of paddy soil at a regional scale.
abstract: The accumulation of a trace metal in rice grain is not only affected by the total concentration of the soil trace metal, but also by crop variety and related soil properties, such as soil pH, soil organic matter (SOM) and so on. However, these factors were seldom considered in previous studies on mapping the pollution risk of trace metals in paddy soil at a regional scale. In this study, the spatial nonstationary relationships between rice-Cr and a set of perceived soil properties (soil-Cr, soil pH and SOM) were explored using geographically weighted regression; and the relationships were then used for calculating the critical threshold (CT) of soil-Cr concentration that may ensure the concentration of rice-Cr being below the permissible limit. The concept of "loading capacity" (LC) for Cr in paddy soil was then defined as the difference between the CT and the real concentration of Cr in paddy soil, so as to map the pollution risk of soil-Cr to rice grain and assess the risk areas in Jiaxing city, China. Compared with the information of the concentration of the total soil-Cr, such results are more valuable for spatial decision making in reducing the accumulation of rice-Cr at a regional scale.
authors.affiliation: Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, 210008 Nanjing, China.
authors.forename: Mingkai
authors.initials: M
authors.lastname: Qu
authors.affiliation: Department of Geography and Center for Environmental Sciences and Engineering, University of Connecticut, Storrs, Connecticut 06269.
authors.forename: Weidong
authors.initials: W
authors.lastname: Li
authors.affiliation: Department of Geography and Center for Environmental Sciences and Engineering, University of Connecticut, Storrs, Connecticut 06269.
authors.forename: Chuanrong
authors.initials: C
authors.lastname: Zhang
authors.affiliation: Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, 210008 Nanjing, China.
authors.forename: Biao
authors.initials: B
authors.lastname: Huang
authors.affiliation: Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, 210008 Nanjing, China.
authors.forename: Yongcun
authors.initials: Y
authors.lastname: Zhao
mesh_terms: D000465:Algorithms; D002681:China; D002857:Chromium / Q000032:analysis* / Q000633:toxicity; D018556:Crops, Agricultural / Q000737:chemistry / Q000187:drug effects / Q000254:growth & development; D004784:Environmental Monitoring / Q000379:methods; D004787:Environmental Pollution / Q000032:analysis*; D005506:Food Contamination / Q000032:analysis; D005843:Geography; D006863:Hydrogen-Ion Concentration; D008962:Models, Theoretical; D009930:Organic Chemicals / Q000032:analysis / Q000633:toxicity; D018570:Risk Assessment / Q000379:methods; D012307:Risk Factors; D012987:Soil / Q000737:chemistry*; D012989:Soil Pollutants / Q000032:analysis* / Q000633:toxicity
chemical_list: D009930:Organic Chemicals; D012987:Soil; D012989:Soil Pollutants; D002857:Chromium