施用秸秆对淹水土壤镉、铜溶出的影响

生态学杂志

施用秸秆对淹水土壤镉、铜溶出的影响

单玉华;李昌贵;陈晨;王小治;封克

扬州大学环境科学与工程学院江苏省环境材料与环境工程重点实验室，江苏
扬州 225009

收稿日期:2007-11-01 修回日期:1900-01-01 出版日期:2008-08-10 发布日期:2008-08-10

Effects of straw incorporation on the solubility of cadmium and copper in flooded soil.

SHAN Yu-hua;LI Chang-gui;CHEN Chen;WANG Xiao-zhi;FENG Ke

Key Laboratory of Environmental Material and Engineering of Jiangsu Province, College of Environmental Sciences and Engineering, Yangzhou University, Yangzhou 225009, Jiangsu， China

Received:2007-11-01 Revised:1900-01-01 Online:2008-08-10 Published:2008-08-10

摘要/Abstract

摘要： 污染土壤中重金属的溶出直接关系到重金属在环境中的迁移及生物有效性。以小麦、水稻秸秆为材料，在淹水培养的条件下研究了添加秸秆对污染土壤Cu、Cd溶出的影响及其与溶解有机碳（DOC）的关系。结果表明：添加秸秆可显著促进Cu、Cd的溶出，促进效应随秸秆用量的增加而提高；与Cd相比，Cu的溶出对添加秸秆更为敏感，麦秸处理Cu、Cd的峰值浓度平均比稻秸处理分别提高98%和31%；麦秸处理DOC的峰值浓度平均比稻秸处理提高约40%；Cu、Cd的溶出与土壤溶液中DOC呈极显著正相关，相关系数分别为0.9072和0.8695；DOC对Cu溶出的促进效率是对Cd溶出促进效率的4倍。

关键词: 狼毒种群, 年龄结构, 根颈, 存活曲线, 种群更新

Abstract: The migration and bioavailability of heavy metals in polluted soil are dependent on their solubility, which could be affected by many factors including organic manure incorporation. With wheat and rice straw as materials, an incubation experiment was conducted under flooded soil condition to investigate the effects of straw incorporation on the solubility of Cu and Cd in soil, and the relationships between the solubility and soil dissolved organic carbon (DOC). The results showed that straw incorporation could significantly enhance the solubility of Cu and Cd in soil, and the concentrations of Cu and Cd in soil solution increased with the incorporation rate of straw. Compared with that of Cd, the solubility of Cu was more sensitive to straw incorporation. The peak concentrations of Cu and Cd in wheat straw treatment were 98% and 31% higher than those in rice straw treatment, respectively, while the peak concentration of soil DOC in wheat straw treatment was approximately 40% higher than that in rice straw treatment. A significant positive correlation was observed between the solubility of soil Cu and Cd and soil DOC. The solubility of Cu was more sensitive to soil DOC concentration, and the enhancing efficiency of soil DOC to Cu solubility was approximately 4 times of that to Cd solubility.

Key words: Stellera chamaejasme population, Age structure, Root crown, Survivorship curve, Population regeneration

单玉华;李昌贵;陈晨;王小治;封克 . 施用秸秆对淹水土壤镉、铜溶出的影响[J]. 生态学杂志.

SHAN Yu-hua;LI Chang-gui;CHEN Chen;WANG Xiao-zhi;FENG Ke . Effects of straw incorporation on the solubility of cadmium and copper in flooded soil. [J]. cje.

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