汞、砷复合污染对水稻生长及吸收汞、砷的影响Effects of Combined Contaminations of Mercury and Arsenate on Growth,Hg and As Uptake of Rice(Oryza sativa L.)Seedlings in Solution Culture
杜心;朱永官;刘文菊;赵晓松;
摘要(Abstract)：
在温室条件下,采用水培方法研究汞、砷复合污染对水稻的生长及对汞、砷吸收的影响.实验结果表明:1)汞、砷复合污染可以显著地降低水稻生物量,汞、砷具有显著的交互作用.2)营养液中汞浓度大于0.5mg·L-1时,可显著降低水稻光合速率、二氧化碳气孔导度、蒸腾速率(p<0.001),而砷的影响不显著.3)随营养液中汞浓度的增加,水稻根部和地上部汞含量显著增加,砷对水稻吸收汞的影响不显著,二者无交互作用.随营养液中砷浓度的增加,砷在水稻根部和地上部的累积显著提高,营养液中的汞显著抑制了水稻根部对砷的吸收,二者表现为拮抗作用;而汞对砷在水稻地上部累积的影响则较复杂,随着汞浓度由0.5mg·L-1增加到1.5mg·L-1,水稻地上部砷含量表现出先降低再升高的趋势.
关键词(KeyWords)： 汞;砷;复合污染;水稻
基金项目(Foundation): 国家重点基础研究发展规划(973)项目(No.2002CB410808);; 国家自然科学基金资助项目(No.20477055)
作者(Author): 杜心;朱永官;刘文菊;赵晓松;
Email:
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