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模拟酸雨与Cd复合污染对黑麦草镉积累及土壤镉形态的影响
李江遐,张军,曹海生,朱江
0
(安徽农业大学资源与环境学院,合肥 230036;安徽农业大学生命科学学院,合肥 230036)
摘要:
通过盆栽实验,研究短期模拟酸雨和Cd复合污染下的黑麦草生长状况和Cd积累情况,以及种植黑麦草后土壤镉形态的变化。结果表明,酸雨强度及土壤Cd浓度的增加对黑麦草的生长有抑制作用,同时促进黑麦草对的Cd积累;黑麦草根部对Cd的积累大于地上部分。随着酸雨pH值的降低,土壤中Cd的释放强度明显增大,土壤中Cd以交换态为主,生物可利用态明显增加。短期内模拟酸雨和Cd 污染对黑麦草都有致害作用, 但Cd 污染的效应大于模拟酸雨的效应。 模拟酸雨与Cd 复合污染环境效应大于这2 种污染物的单因素效应。
关键词:  模拟酸雨  Cd  黑麦草  镉形态
DOI:
基金项目:中国国家地质调查局项目(1212010511218)和安徽农业大学吸引及稳定人才基金共同资助。
Combined effects of cadmium and simulated acid rain on cadmium accumulation in ryegrass and Cd form in soil
LI Jiangxia,ZHANG Jun,CAO Haisheng,ZHU Jiang
(School of Resources and Environment Science, Anhui Agricultural University, Hefei 230036;School of Life Science, Anhui Agricultural University, Hefei 230036)
Abstract:
The release and form distribution, transformation of Cd in different Cd polluted soils affected by simulated acid rain were studied by pot experiment. The results showed that the growth of ryegrass was inhibited, and the total content of Cd increased obviously as increasing acidity of simulated acid rain and Cd concentration in soil. The content of Cd in root was higher than in overground parts. The quantity of active fraction of Cd in soils increased, and the active ability enhanced with the increase of rain acidy. Also, the main Cd was of exchange form in soil, and bioavailable form of Cd increased markedly. In a short time, simulated acid rain and Cd are all harmful to ryegrass, and the effect of Cd is more serious than simulated acid rain.The combined effects of Cd and simulated acid rain on environment are more harmful than Cd and simulated acid rain individual.
Key words:  simulated acid rain  cadmium (Cd)  ryegrass  Cd form

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