张晓晴;韦东普;李波;李菊梅;陈世宝;马义兵;

• 1:湖北民族学院林学园艺学院
• 2:中国农业科学院农业资源与农业区划研究所国家土壤肥力与肥料效益监测站网
• 3:中国农业科学院农业资源与农业区划研究所 国家土壤肥力与肥料效益监测站网

摘要(Abstract)：

土壤中铜(Cu)重金属的生物毒性/有效性主要取决于它们在土壤液相中含量和土壤溶液的性质。探寻土壤有效态Cu的生物毒害效应,表征量化其与土壤溶液性质关系,可为土壤Cu的环境风险评价提供参考。选取17种典型农田土壤,探讨了有效态Cu(土壤孔隙水以及CaCl_2浸提态)对小白菜生长的毒性效应及其预测模型。结果表明:土壤孔隙水中Cu对小白菜生长10%抑制的毒性阈值值(EC_(10))和50%抑制的毒性阈值(EC_(50)),最大值与最小值相差为14.7和14.6倍;同样,对于CaCl_2提取态Cu的EC_(10)和EC_(50),最大值与最小值相差12.7和7.7倍,表明土壤溶液性质对水溶性Cu对小白菜的毒性阈值影响很大。建立了土壤溶液的重要因子(溶解性有机碳、土壤溶液pH值、电导率、全硫含量、Ca~(2+)、Mg~(2+)、K~+、Na~+)和水溶性Cu阈值之间的多元回归关系,结果显示,土壤溶液性质可以较好地预测水溶性Cu对小白菜的毒性阈值。同时,土壤溶液中Mg~(2+)、K~+和S的含量是控制孔隙水中Cu对小白菜生长毒性的最重要因子,单一的S能分别解释34%的EC_(10)变异,K~+解释26%的EC_(50)变化。本研究结果可为陆地环境中水溶性Cu的风险评价提供基础。

关键词(KeyWords)： 土壤;铜;毒害效应;小白菜

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金资助项目(40971262);; 公益性行业(农业科研)科研专项项目(200903015)

作者(Author): 张晓晴;韦东普;李波;李菊梅;陈世宝;马义兵;

Email:

DOI:

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