Cd,Zn复合污染菜地土壤中重金属形态分布与植物有效性  

Form distribution and phytoavailability of heavy metals(Cd,Zn) in vegetable soil

作　　者：赵转军[1] 南忠仁[1] 王兆炜[1] 杨一鸣[1] 王胜利[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,兰州730000

出　　处：《兰州大学学报（自然科学版）》2010年第2期1-5,10,共6页Journal of Lanzhou University(Natural Sciences)

基　　金：国家自然科学基金项目(40671167;40671179);国家环境保护公益性项目(200809098);国家重点基础研究发展计划(973计划)项目(2008CB417212)

摘　　要：采用盆栽试验,研究了干旱区绿洲土壤-胡萝卜系统中Cd,Zn的形态变化特征及其植物有效性.结果表明:供试绿洲土壤原状土中,Cd,Zn均以稳定的残渣态形式存在,而处理土壤中两种重金属残渣态质量分数变化很小,Cd主要以碳酸盐结合态形式存在,Zn主要以铁锰氧化态形式存在.两种元素的活性大小为Cd>Zn.根据相关和回归分析,Zn对胡萝卜茎叶和总吸收Zn量贡献以碳酸盐结合态和铁锰氧化态为主,其中碳酸盐结合态贡献最大.Pot experiment was conducted to study the distribution of Cd, Zn chemical forms and their phytoavailability in arid oasis soil-carrot system. The findings show that the chemical form contents of metal Cd, Zn mainly existed in residual fraction in untreated soils, while in treated soils those of the exotic metal Cd, Zn were found predominantly in carbonate forms and Fe-Mn oxides bound forms, respectively. The passivation of these two heavy metals in oasis soil fluctuated smoothly and the phytoavailable order of selected heavy metals was Cd〉Zn. According to the results of the correlation and regression analysis, it was found that carbonate and Fe-Mn oxides bound forms made a significant contribution to the accumulation of metal Zn in the stem of Daucus Carota and for the total accumulation （the sum of accumulation of metal Zn in the stem and tuber）, carbonate Zn was the most important contributor.

关 键 词：CD ZN 形态分布 植物有效性 河西走廊 

分 类 号：P934[天文地球—自然地理学] X53[环境科学与工程—环境工程]