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| Independence and Dependence of Soil Environmental Quality Standard for Heavy Metals |
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| KeyWord:soil environmental quality; heavy metals; critical values; standard; management method by loading capacity |
| Author Name | Affiliation | | ZHOU Dong-mei | Key Lab of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Science, Nanjing 210008, China | | WANG Yu-jun | Key Lab of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Science, Nanjing 210008, China | | CHEN Huai-man | Key Lab of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Science, Nanjing 210008, China |
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| Abstract: |
| Soil environmental quality standards for heavy metals have both independence and dependence. Its independence refers to the assignment of absolute criteria values derived from soil background conditions based on natural soil protection or soil quality objectives, while the dependence means the assignment of relative limits based on soil resource management or health and ecological risks. This paper presented the principles and methodologies of developing soil environmental quality standards, and discussed the relationship between independence and dependence of assigning the standard values. When assigning soil environmental quality standards based on natural soil quality background values, the standards represent objective values for active protection of soil quality of the natural environment, which is independent of the ways of soil resource utilization. The national quality standards in forms of total amount of heavy metals may be developed according to soil classes. When assigning soil environmental quality standards based on the soil resource management, the standards or criteria are dependent on a large variety of factors. Therefore, it is difficult to give a unified national value, but to have different specified values depending on different industrial sectors and local administrations in forms of either total amount or extractable heavy metal contents. For agricultural sector, it is suggested to derive soil threshold values from the related food health standards. With overall consideration of the independence and dependence of soil environmental quality standards, a new soil management strategy is recommended that requires inclusion of pollutant loading capacity to better protect soil environmental quality. This new soil management strategy emphasizes the dynamic equilibrium of anthropogenic substances to effectively protect the sustainable use of soil resources and the national food security. |
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