Thiosulphate-induced mercury accumulation by plants: metal uptake and transformation of mercury fractionation in soil - results from a field study
文献类型： 外文期刊
作者： Wang, Jianxu 1 ; Feng, Xinbin 1 ; Anderson, Christopher W. N. 3 ; Wang, Heng 1 ; Wang, Lulu 4 ;
作者机构： 1.Chinese Acad Sci, State Key Lab Environm Geochem, Inst Geochem, Guiyang 550002, Peoples R China
2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
3.Massey Univ, Inst Agr & Environm, Palmerston North 4442, New Zealand
4.Guizhou Acad Agr Sci, Oil Crops Inst, Guiyang 550006, Peoples R China
关键词： Phytoextraction;Mercury fractionation;Definition of bioavailable mercury;Environmental risk
期刊名称：PLANT AND SOIL （ 影响因子：4.192； 五年影响因子：4.712 ）
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收录情况： SCI
摘要： The thiosulphate induced accumulation of mercury by the three plants Brassica juncea var.LDZY, Brassica juncea var.ASKYC and Brassica napus var. ZYYC and the transformation of mercury fractionation in the rhizosphere of each plant was investigated in the field. Experimental farmland was divided into control and thiosulphate plots. Each plot was divided into three subplots with each planted with one of the plants. After harvesting, the mercury concentration in plants, mercury fractionation in rhizosphere soil before and after phytoextraction, and the vertical distribution of bioavailable mercury in bulk soil profiles was analyzed. The cultivar B. juncea var.LDZY accumulated a higher amount of mercury in shoots than the other two plants. Thiosulphate treatment promoted an increase in the concentration of metal in plants and a transformation of Fe/Mn oxide-bound and organic-bound mercury (potential bioavailable fractions) into soluble and exchangeable and specifically-sorbed fractions in the rhizosphere. The observed increase in bioavailable rhizosphere mercury concentration was restricted to the root zone; mercury did not move down the soil profile as a function of thiosulphate application to soil. Thiosulphate-induced phytoextraction has the potential to manage environmental risk of mercury in soil by decreasing the concentration of mercury associated with potential bioavailable fraction that can be accumulated by crop plants.
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