EDTA辅助下地被石竹对铅污染土壤的修复潜力  

EDTA Assisted Phytoremediation Potential of Dianthus plumarius L. for Pb-contaminated Soil

作　　者：祁由菊[1] 崔德杰[1] 

机构地区：[1]莱阳农学院资源与环境学院,山东青岛266109

出　　处：《农业环境科学学报》2008年第1期165-169,共5页Journal of Agro-Environment Science

基　　金：山东省自然科学基金项目"重金属污染土壤植物修复机制及调控技术的研究"(Y2003E01)

摘　　要：采用盆栽试验,研究了铅(Pb)污染土壤添加乙二胺四乙酸(EDTA)对地被石竹生长及吸收Pb的影响。结果表明,未施用EDTA情况下,地被石竹的转运系数和生物富集系数分别为0.31～0.40,0.25～1.58,且植株含Pb量随土壤Pb浓度的提高而显著增加。施用EDTA情况下,转运系数为0.59～1.41,地上部含Pb量最高值可达1432.81mg·kg-1。125、250、500、1000mg·kg-1的Pb添加水平上,施用5mmol·kg-1EDTA的处理,Pb迁移总量分别是2234.61、2013.30、5600.84和2083.16μg·盆-1,转运量系数为0.71、0.74、0.80和0.90;10mmol·kg-1EDTA处理下,迁移总量分别是2275.26、4032.95、4578.92和1977.05μg·盆-1,转运量系数为0.80、0.84、0.90、0.91。因此,地被石竹对Pb有较强的耐性,在EDTA辅助下具有超富集Pb的潜力。A pot experiment was conducted in the green house to study the effect of EDTA on the phytoremediation of lead by Dianthus plumarius L. The results revealed that without the addition of EDTA, the ratio of Pb content in shoots to that in roots was 0.31 ～0.40, the bioaccumnlation coefficient was 0.25-1.58, and the uptake of Pb by the plant tended to increase with the increased concentration of lead in soils. With the addition of EDTA, the ratio of Pb content in shoots to that in roots was 0.59～1.41, and the maximum Pb content in shoots was 1 432.81 mg·kg^-1. When the concentrations of lead in soil were 125, 250, 500, 1 000 mg·kg^-1, with 5 mmol·kg^-1EDTA applied, the total lead translocation in plants was 2 234.61, 2 013.30, 5 600.84 and 2 083.16 μg·pot^-1, 71%, 74%, 80% and 90% of that in shoots, respectively; with 10 mmol·kg^-1EDTA addition, the total lead translocation was 2 275.26,4 032.95,4 578.92, 1 977.05 μg·pot^-1, and 80%, 84%,90%, 91% of that in shoots of Dianthus plumarius L., respectively. These indicated that Dianthus plumarius L. was tolerant to lead and had a great application potential in phytoremediation of Pb-contaminated soils with the aid of EDTA addition.

关 键 词：地被石竹 乙二胺四乙酸 含铅量 铅迁移量 

分 类 号：X53[环境科学与工程—环境工程]