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| Classification methods for typical lead-contaminated rice production areas of the middle and lower Yangtze River in China |
| Received:July 03, 2018 |
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| KeyWord:classification of rice production area;lead;enrichment coefficient;species sensitivity distribution |
| Author Name | Affiliation | E-mail | | CHENG Jing-liang | School of Environmental & Safety Engineering, Changzhou University, Changzhou 213000, China
State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China | | | ZHAO Long | State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China | zhaolong1227@126.com | | YANG Yan | School of Environmental & Safety Engineering, Changzhou University, Changzhou 213000, China | yy129129@163.com | | HOU Hong | State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China | | | SUN Zai-jin | State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China | | | MA Jin | State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China | |
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| Abstract: |
| We selected the middle and lower reaches of the Yangtze River basin, a typical rice-producing area in China, as the research object. We considered the effects of rice varieties and soil physico-chemical properties, and we investigated the techniques for classifying rice-producing areas as "suitable yield" "restricted yield" and "forbidden yield" using the species sensitivity distribution(SSD) method. This decision was based upon the collection of collaborative survey data regarding lead contamination of 20 rice varieties and the corresponding soil. Furthermore, the soil lead content threshold for the three classification areas was derived to protect different proportions of rice variety. The results show that the soil pH of this typical rice-producing area negatively correlated to the lead enrichment coefficient of rice. The correlation coefficient was -0.46(P<0.05). The soil organic carbon was positively correlated to the lead enrichment coefficient of rice, and the correlation coefficient was 0.91(P<0.01). The regression model, derived from pH and soil organic carbon variables, can explain the 83.20% variation of rice enrichment factors. The sequence of rice variety sensitivity distribution in the four typical scenarios was consistent. The soil lead content in the middle and lower reaches of the Yangtze River basin was less than or equal to 14.81 mg·kg-1, 14.81~185.24 mg·kg-1 and greater than or equal to 185.24 mg·kg-1. Generally, this classification method shows good rationality, universality, and operability. Furthermore, it can be extended to the classification of rice-producing areas nationwide. It also provides important technical support opportunities for the risk management of agricultural land in China. |
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