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首页> 外文期刊>The Science of the Total Environment >Geochemical cadmium anomaly and bioaccumulation of cadmium and lead by rapeseed (Brassica napus L.) from noncalcareous soils in the Guizhou Plateau
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Geochemical cadmium anomaly and bioaccumulation of cadmium and lead by rapeseed (Brassica napus L.) from noncalcareous soils in the Guizhou Plateau

机译：贵州高原非钙质土壤油菜的地球化学镉异常及油菜中铅和镉的生物富集

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摘要

The cruciferous crop, oil rapeseed (Brassica napus L.), may bioaccumulate excessive cadmium(Cd) and lead (Pb) as well, from Cd-enriched noncalcareous soils in Guizhou province of southwestern China. Field paired soil-rapeseed sampling and greenhouse experiment were performed to characterize the Cd anomaly in rapeseed-planting soils and to predict the bioaccumulation of Cd and Pb in raw seeds using soil variables. The results indicated that total soil-Cd concentrations averaged 0.43 mg kg(-1) (range 0.11-1.41 mg kg(-1)) from field investigation; and a soil type dependent Cd anomaly was observed. Besides, cumulative frequency of total soil-Cd was plotted to be helpful in delimitation of regional Cd anomalies. Rapeseeds readily bioaccumulated Cd from soils as validated by greenhouse experiment and field data. Contrary results were observed in relation to rapeseed Pb levels measured from greenhouse experiment (very low) and field (very high) which was likely due to soil particle contamination as indicated by the considerably higher ratio of Pb to Cd level in seeds harvested from fields. Based on multiple stepwise regression analysis, reliable Cd soil-rapeseed relationships, but less reliable for Pb, were derived using either total or (bio) available metal concentrations and were further inversely used to derive local soil Cd criteria (e.g., total soil-Cd based, 2.5 mg kg(-1)) based on Hygienic Standard for Feeds (GB13082-2001). Although seed Cd levels (feed standard) observed in field data indicated a least human dietary risk, however, high (bio) availability of Cd, but not Pb, in Cd-enriched acid soil still poses high environmental risks and may threaten food safety of other crops. (C) 2018 Elsevier B.V. All rights reserved.
机译：十字花科作物油菜籽（Brassica napus L.）也可能从西南的贵州省富含镉的非钙质土壤中生物积累过量的镉（Cd）和铅（Pb）。进行田间配对油菜采样和温室试验，以表征油菜种植土壤中的镉异常，并利用土壤变量预测生种子中镉和铅的生物积累。结果表明，根据现场调查，土壤中Cd的总浓度平均为0.43 mg kg（-1）（范围为0.11-1.41 mg kg（-1））。并观察到土壤类型的镉异常。此外，绘制了土壤中Cd的累积频率，有助于划定区域Cd异常。通过温室试验和田间数据验证，油菜容易从土壤中生物富集镉。从温室实验（非常低）和田间（非常高）测得的油菜籽Pb水平观察到相反的结果，这很可能是由于土壤颗粒污染所致，从田间收获的种子中Pb与Cd的比例要高得多。基于多重逐步回归分析，使用总或（生物）有效金属浓度推导了可靠的Cd土壤-油菜籽关系，但对Pb的可靠性较低，并进一步反演以得出当地土壤Cd标准（例如，总土壤-Cd基于饲料卫生标准（GB13082-2001）的2.5 mg kg（-1））。尽管在田间数据中观察到的种子Cd水平（<饲料标准）表明人类的饮食风险最低，但是，在富含Cd的酸性土壤中，Cd的高（生物）利用率而不是Pb仍然构成高环境风险，并可能威胁食品安全其他农作物（C）2018 Elsevier B.V.保留所有权利。

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