| SSD法对西南碳酸盐岩母质区稻田土壤镉污染类型划分研究 |
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| 引用本文： | 韩东锦,赵龙,张乃明,侯红,孙在金. SSD法对西南碳酸盐岩母质区稻田土壤镉污染类型划分研究[J]. 环境科学研究, 2021, 34(2): 409-418. DOI: 10.13198/j.issn.1001-6929.2020.07.07 |
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| 作者姓名： | 韩东锦 赵龙 张乃明 侯红 孙在金 |
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| 作者单位： | 中国环境科学研究院, 环境基准与风险评估国家重点实验室, 北京 100012;云南农业大学资源与环境学院, 云南 昆明 650201;云南省土壤培肥与污染修复工程实验室, 云南 昆明 650201;中国环境科学研究院, 环境基准与风险评估国家重点实验室, 北京 100012;云南农业大学资源与环境学院, 云南 昆明 650201;云南省土壤培肥与污染修复工程实验室, 云南 昆明 650201 |
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| 基金项目： | 国家重点研发计划项目（No.2017YFD0801101） |
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| 摘 要： | 在我国西南地区典型碳酸盐岩母质区域存在现行农用地土壤镉（Cd）污染风险管控标准值偏严的现象，表现为土壤中Cd含量超标而农产品中Cd无安全风险.针对该现实问题，在基于该地区稻米-土壤协同调查数据的基础上，充分考虑了土壤理化性质，通过分析样品中Cd的富集系数（BCF）并利用物种敏感性（SSD）分布模型，对Cd毒性剂量-效应关系进行拟合，最终反推出在不同pH下适用于典型碳酸盐岩类成土母质农用地土壤Cd污染的风险筛选值和管控值.结果表明:当土壤pH在5.5 < pH ≤ 6.5范围时，基于保护90%及10%的水稻品种安全所得的土壤Cd毒性阈值分别为HC10=0.34 mg/kg和HC90=2.00 mg/kg；在pH ≤ 5.5、6.5 < pH ≤ 7.5、pH > 7.5这3个pH条件下，HC10分别为0.22、0.68和0.80 mg/kg，HC90分别为1.64、4.80和9.20 mg/kg，当土壤中Cd含量低于HC10时，表明稻米安全风险较低；当土壤中Cd含量介于HC10~HC90之间时，表明稻米安全具有一定风险，应对稻田土壤采取安全利用措施；当土壤中Cd含量超过HC90时，表明稻米安全具有极高风险，应对稻田土壤采取严格管控措施.研究显示，我国西南地区典型碳酸盐岩母质区域农产品超标点位主要集中于5.5 < pH ≤ 6.5范围内，表明土壤pH对稻米Cd的富集效应有较大影响，在酸性条件下其富集效应更为显著.
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| 关 键 词： | 碳酸盐岩母质 镉(Cd) 富集系数 物种敏感性分布(SSD) |
| 收稿时间： | 2019-12-10 |
| 修稿时间： | 2020-04-27 |
Classification of Cd Contaminated Paddy Soils in Carbonate Parent Material Area of Southwest China by Species Sensitivity Distribution Method (SSD) |
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| HAN Dongjin,ZHAO Long,ZHANG Naiming,HOU Hong,SUN Zaijin. Classification of Cd Contaminated Paddy Soils in Carbonate Parent Material Area of Southwest China by Species Sensitivity Distribution Method (SSD)[J]. Research of Environmental Sciences, 2021, 34(2): 409-418. DOI: 10.13198/j.issn.1001-6929.2020.07.07 |
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| Authors: | HAN Dongjin ZHAO Long ZHANG Naiming HOU Hong SUN Zaijin |
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| Affiliation: | 1.State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China2.College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China3.Yunnan Soil Fertilizer and Pollution Remediation Engineering Laboratory, Kunming 650201, China |
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| Abstract: | There is a phenomenon that the risk control standard for cadmium (Cd) in agricultural land is too strict for the typical carbonate parent material areas in southwest China, which indicates that the Cd content in the soil exceeds the standard whereas there is no safety risk of Cd for agriculture products. In view of this practical problem, this study fully considered the physicochemical properties of the soil and its parent material on the basis of cooperative investigation data. Through the analysis of the Cd enrichment coefficient (BCF) in the samples, the species sensitivity distribution model was used to fit the Cd toxicity dose-effect relationship of rice, and finally the risk control screening value and control value of Cd in agricultural land that were suitable for typical carbonate parent materials were derived. The results showed that when the soil pH was in the range of 5.5 to 6.5, the soil threshold values were HC10=0.34 mg/kg and HC90=2.00 mg/kg for the protection of 90% and 10% rice varieties, respectively. The HC10 were 0.22, 0.68 and 0.80 mg/kg. The HC90 were 1.64, 4.80 and 9.20 mg/kg when pH ≤ 5.5, 6.5 < pH ≤ 7.5, and pH > 7.5. When the Cd content in soil is lower than HC10, the risk of rice safety is low. When the Cd content in the soil is between HC10 and HC90, there may be safety risk of rice, and some safety utilization measures should be taken for the paddy soil. When the Cd content in the soil is higher than HC90, the safety risk of rice is very high, and strict control measures should be taken for the paddy soil. The results indicate that the over standard sampling points of agricultural products are mainly concentrated between pH 5.5 and 6.5, which indicates that the soil pH significantly affects Cd enrichment of rice, especially under acid conditions. |
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| Keywords: | carbonate parent material cadmium (Cd) enrichment coefficient species sensitivity distribution (SSD) |
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