【摘 要】
：
Much work has done on the mode of occurrence of heavy metals in soils,but few researchers pay attentions to the influence of plant growth on bioactivity of heavy metals in soil.To understand effect of
【机 构】
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College of Environment and Ecolodge,Xiamen University,Xiamen 361102,China
【出 处】
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The 17th International Conference on Heavy Metals in the Env
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Much work has done on the mode of occurrence of heavy metals in soils,but few researchers pay attentions to the influence of plant growth on bioactivity of heavy metals in soil.To understand effect of plant on the bioactivity of mercury in polluted soil,potting cultivation of Kandelia obovata was used.Chemical forms of Hg were determined with modified BCR method,contents of total Hg(HgT)in soil and in plant organs were also determined.The results showed as follows.(1)Before plantation,volatile Hg(HgVOL)and residual Hg(HgR)were the dominant forms of Hg in soil,the average proportion of different speciation of Hg decreased in a order of residual Hg > volatile Hg > B3-bounded Hg > B2-bounded Hg > B1-bounded Hg.After plantation,content of HgT in soil decreased,and the percentage of HgR reduced.It suggested that plants growth activate residual Hg.(2)Contents of HgT in plant roots and leaves increased with the time,while actual contents of HgT in soils decreased slightly.(3)It exists significantly positive correlation between HgVOL in soil and HgT in roots and leaves(p<0.01).The correlation of B1-bounded Hg content to HgT in roots and leaves is also conspicuous.There are positive correlation among B2-bounded Hg,HgR and HgT in roots and leaves(p<0.05).The roots of Kandelia obovata mainly absorbed B1-bounded Hg and volatile Hg.There are significantly positive correlation between HgT in roots and leaves and content of HgT in soil.
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