土壤2013，Vol.45Issue(2)：233-238,6.
调控剂对锌镉污染土壤植物修复效率及后茬蔬菜重金属吸收的影响
Effect of Amendments on Phytoextraction Efficiency and Metal Uptake of Following Vegetable in Heavy Metal Contaminated Soil
摘要
Abstract
High amount of organic manure made from sewage sludge was applied continuously within 12 years which resulted in soil zinc (Zn) and cadmium (Cd) contamination.This kind of Zn and Cd contaminated soil was collected to conduct the pot experiment for phytoextraction using Zn and Cd hyperaccumulator,Sedum plumbizincicola.Organic chelates,such as iminodisuccinic acid sodium salt (IDS),ethylene diaminedisuccinic acid (EDDS) were applied,elemental sulphur (S) and calcium magnesium phosphate fertilizer (CaMgP) was also added to the soil in this experiment in order to find out a good enhanced remediation model that can enhance the extraction efficiency when growing hyperaccumulator and reduce the heavy metal concentrations in vegetables after phytoextraction.The results showed that compared to control or EDDS treatments,the shoot biomass of S.plumbizincicola was increased significantly by adding 120 mmol/kg sulphur,and the increase rates were 34.7％,47.9％,respectively.Cd concentration in S.plumbizincicola plant shoot decreased significantly in treatment of 3 mmol/kg IDS,the decrease rate was 35.5％ compared with the control.4 g/kg of CaMgP fertilizer could reduce heavy metals' bioavailability,then decreased Zn and Cd concentrations in following vegetable Amaranthus spinosus by 57％ and 63％,respectively.The soil ammonia acetate extractable Zn and Cd decreased by 66.1％ and 72.4％ respectively compared to control after application CaMgP fertilizer.Therefore,appropriate application of sulphur fertilizer could promote the growth of Sedum plumbizincicola and the addition of CaMgP fertilizer could reduce the concentration of the active heavy metals in the soil and the pollution risk of the later vegetables.关键词
调控剂/伴矿景天/苋菜/Zn/CdKey words
Amendments/ Sedum plumbizincicola/ Amaranthus spinosus/ Zinc/ Cadmium分类
资源环境引用本文复制引用
任婧,吴龙华,刘鸿雁,骆永明..调控剂对锌镉污染土壤植物修复效率及后茬蔬菜重金属吸收的影响[J].土壤,2013,45(2):233-238,6.基金项目
中国科学院知识创新工程重要方向项目(KSCX2-YW-G053)和教育部211重点学科建设项目(211kst200902)资助. （KSCX2-YW-G053）
