研究报告
操庆,刘伟京,谢丽强,尤本胜,姜伟立,顾毓蓉,杨柳燕.土壤添加不同粘土矿物对微囊藻毒素在生菜中生物富集的影响[J].环境科学学报,2020,40(8):2986-2992
土壤添加不同粘土矿物对微囊藻毒素在生菜中生物富集的影响
- Effects of different kinds of clay mineral soil amendment on bioaccumulation of microcystins in lettuce
- 基金项目：国家自然科学基金青年基金资助项目（No.41907350）；中国博士后科学基金资助项目（No.2019M651753）
- 作者
- 单位
- 操庆
- 1. 南京大学环境学院, 污染控制与资源化研究国家重点实验室, 南京 210023;2. 中国科学院南京地理与湖泊研究所, 湖泊与环境国家重点实验室, 南京 210008;3. 江苏省环境科学研究院, 江苏省环境工程重点实验室, 南京 210036
- 刘伟京
- 江苏省环境科学研究院, 江苏省环境工程重点实验室, 南京 210036
- 谢丽强
- 中国科学院南京地理与湖泊研究所, 湖泊与环境国家重点实验室, 南京 210008
- 尤本胜
- 江苏省环境科学研究院, 江苏省环境工程重点实验室, 南京 210036
- 姜伟立
- 江苏省环境科学研究院, 江苏省环境工程重点实验室, 南京 210036
- 顾毓蓉
- 中国科学院南京地理与湖泊研究所, 湖泊与环境国家重点实验室, 南京 210008
- 杨柳燕
- 南京大学环境学院, 污染控制与资源化研究国家重点实验室, 南京 210023
- 摘要：土壤-作物系统中微囊藻毒素的生物富集会对人类健康造成潜在威胁.本研究通过生菜（Lactuca sativa L.var.ramosa Hort.）种植实验比较了土壤添加不同比例的3种粘土矿物（凹凸棒石、蒙脱石和沸石）对微囊藻毒素-LR（microcystin-LR，MC-LR）生物富集的影响，分析含10 μg·L-1 MC-LR溶液灌溉土壤50 d后，不同处理的MC-LR在生菜中累积量及土壤中的有效态含量和总含量.结果表明，3种粘土矿物能够不同程度有效减少MC-LR在生菜根系和叶片中的富集.5%的凹凸棒石和蒙脱石处理的生菜叶片中MC-LR含量分别较空白处理降低53.0%和52.3%，使得摄入量降低到WHO组织要求的日允许摄入限量范围.添加粘土矿物显著降低了土壤中MC-LR有效态含量.相关分析发现，生菜根系和叶片中MC-LR的含量与土壤MC-LR有效态含量均呈显著正相关.实验结果为蓝藻污染地区削减微囊藻毒素的作物富集提供了科学依据.
- Abstract：Bioaccumulation of microcystin in soils could pose a potential threat to human health. In order to investigate the effect of soil amendments on the microcystin-LR (MC-LR) bioaccumulation in crops, we conducted a lettuce (Lactuca sativa L. var. ramosa Hort.) cultivation experiment by different ratios of clay minerals (attapulgite, montmorillonite, and zeolite). After irrigation with 10 μg·L-1 MC-LR solution for 50 d, the MC-LR concentrations in the lettuce, as well as the total and bioavailable MC-LR concentrations in the soil were analyzed. The results showed that application of clay minerals could effectively reduce MC-LR bioaccumulation in lettuce roots and leaves. The content of MC-LR in the lettuce leaves treated with 5% attapulgite and montmorillonite decreased by 53.0% and 52.3%, compared with the controls, and the estimated daily intake values were much lower than the tolerable daily intake limit proposed by the WHO. The bioavailable MC-LR concentrations significantly decreased. The correlation analysis result showed that there was a positive correlation between the bioavailable MC-LR concentrations in the soil and the MC-LR content in the lettuce roots, as well as the leaves. Results from the present study provide scientific guidance for reducing microcystins bioaccumulation in crops in cyanobacteria-polluted areas.
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