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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
韩东锦1, 赵龙2, 侯红2, 张乃明3
1.云南农业大学资源与环境学院;2.中国环境科学研究院;3.云南农业大学
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,本文在基于该地区稻米-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条件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毒性阈值为HC10=0.34 mg/kg、HC90=2.00 mg/kg;在其他3类(pH≤5.5、6.5<pH≤7.5、pH>7.5)pH条件下的HC10和HC90分别为0.22 mg/kg和1.64 mg/kg、0.68 mg/kg和4.80 mg/kg、0.80 mg/kg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. 研究结果表明,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.
关键词:  碳酸盐岩母质    富集系数  物种敏感性分布(SSD)
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基金项目:国家重点研发计划项目
Research on the Classification of Cd Contaminated Pollution Types in Paddy Soils in of Carbonate Parent Material Area of in Southwest China by Species Sensitivity Distribution Method (SSD)
ZHAO LONG,HOU HONG,et al
Abstract:
There is a phenomenon that the risk control standard of Cadmium (Cd) in agricultural land is too strict for the typical carbonate parent material areas of Southwest China, showing that the Cd contents in soil exceeding 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 soil and its parent material; on the basis of cooperative investigation data. Through analysis on the enrichment coefficient(BCF) of Cd in samples, fitted the Cd toxicity dose-effect relationship of rice by utilization of Species sensitivity distribution model, and finally deduced the risk control screening value and control value of Cd in agricultural land which were suitable for typical carbonate parent materials. The results showed that when the soil pH was in the range of (5.57.5). 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 exist safety risk of rice, and some safety utilization measures should be taken for the paddy soil; when the Cd content in soil is higher than HC90, the safety risk of rice is very high, and the strict control measures should be taken for the paddy soil. The results indicated that; the over standard sampling points of agricultural products were mainly concentrated on the range of 5.5< pH≤6.5, which indicated that the soil pH played a great influence on Cd enrichment effect of rice, especially on the acid conditions.
Key words:  Carbonate matrix  Cadmium  Enrichment coeffcient  species sensitivity distribution (SSD)