干旱区绿洲土壤共存重金属Cd、Pb、Zn、Ni的吸收积累及形态分布实验研究  

Experiments on accumulation and chemical forms of Cd,Pb,Zn and Ni in arid oasis soils

作　　者：廖琴[1] 王胜利[1] 南忠仁[1] 武文飞[1] 周婷[1] 晋王强[1] 赵翠翠[1] 刘娇[1] 

机构地区：[1]兰州大学资源环境学院西部环境教育部重点实验室,甘肃兰州730000

出　　处：《干旱地区农业研究》2010年第5期108-114,共7页Agricultural Research in the Arid Areas

基　　金：国家环境保护公益性项目(NEPCP200809098);兰州大学中央高校基本科研业务费专项资金(lzujbky-2009-65)

摘　　要：通过盆栽试验和室内分析初步研究了共存重金属Cd、Pb、Zn、Ni在干旱区绿洲土壤-芹菜系统中的吸收积累和形态变化特征。结果表明:Cd、Pb、Zn、Ni四种共存重金属元素在芹菜不同部位的吸收量均为根部>地上部,累积率大小顺序依次为Cd>Zn>Ni>Pb;供试绿洲土壤原状土中Pb、Zn、Ni均以稳定的残渣态为主要存在形态,Cd以铁锰氧化态为主要存在形态,随着重金属元素添加量的增加,土壤中的Cd主要以碳酸盐态存在,Pb主要以碳酸盐态和铁锰氧化态存在,而Zn和Ni主要以铁锰氧化态存在;逐步回归分析表明,干旱区绿洲土壤中Cd的可交换态对芹菜地上部Cd含量的贡献最大,Ni的铁锰氧化态对芹菜根部Ni含量的贡献最大,而对芹菜地上部和根部吸收Pb和Zn量贡献最大的形态分别为Pb和Zn的可交换态。Pot experiment was conducted to study the absorption and accumulation characters of Cd,Pb,Zn and Ni on the growth of celery and the chemical forms of selected heavy metals in arid oasis soils.The results showed that the accumulation rate order of heavy metals from soil to the celery was CdZnNiPb,and the concentration of heavy metals in the root was higher than that in leaves.The chemical form contents of metal Pb,Zn and Ni mainly existed in residual fraction in untreated soils,while Cd mainly existed in Fe-Mn oxides bound form.With the increase of exotic heavy metals,the existence of Cd mainly was in the forms of carbonate,carbonate forms and Fe-Mn oxides bound forms to element Pb,and Fe-Mn oxides bound forms to metal Zn and Ni.According to the results of regression analysis,it was found that EX-Cd made significant contribution to the accumulation of Cd in the leaves of celery,EX-Pb and EX-Zn to the accumulation of Pb and Zn in both tissues,and FMO-Ni to the accumulation of Ni in the root of celery.

关 键 词：绿洲土壤 重金属 芹菜 吸收积累 形态 

分 类 号：X503.231[环境科学与工程—环境工程]