摘要
采用盆栽试验,初步研究了干旱区绿洲土壤—胡萝卜系统中镉、锌、镍3种重金属的形态变化特征及其生物有效性问题。结果表明:供试绿洲土壤原状土中,Cd、Zn、Ni均以稳定的残渣态形式存在,而处理土壤中重金属被钝化的量有限,Cd的存在形式主要以碳酸盐态为主,Zn、Ni则主要以铁锰氧化态为主;3种元素的活性大小依次为Cd>Ni>Zn。根据回归分析,元素Zn对胡萝卜块茎和茎叶吸收Zn量贡献最大的分别是Zn的碳酸盐结合态和铁锰氧化态;元素Ni对胡萝卜各部位吸收贡献最大的均为Ni的铁锰氧化态。
Using the Tessier A method, the three chemical forms of selected heavy metals were determined to investigate the speciation and bioavailability of selected heavy metals in arid oasis soil-plant system. The findings showed that the chemical form contents of metal Cd, Zn, and Ni mainly existed in residual fraction in untreated soils, while in treated oasis soils those about the exotic metal Cd, Zn, and Ni were found predominantly in carbon- ate forms to element Cd, and Fe-Mn oxides bound forms to metal Zn and Ni. The passivation of these heavy metals in oasis soil fluctuated smoothly and the activity order of selected heavy metals was Cd 〉 Ni 〉 Zn. According to the results of regression analysis, it was found that CAB-Zn and FMO-Zn made the significant contribution to the accumulation of metal Zn in the tuber and stem of Daucus Carota, and FMO-Ni to the accumulation of metal Ni in both tissues.
出处
《地球科学进展》
CAS
CSCD
北大核心
2008年第11期1194-1200,共7页
Advances in Earth Science
基金
国家自然科学基金项目"灌溉水pH与共存元素变化下干旱区绿洲土壤重金属纵向分异机理研究"(编号:40671167)
国家环境保护公益性项目"干旱区绿洲土壤重金属污染生态风险评估与管理技术规范"(编号:200809098)资助
