摘要
通过盆栽试验研究了EDTA和低分子量有机酸对土壤溶液性质、土壤铜形态变化和印度芥菜生长及铜吸收的影响。结果表明 ,施用pH6.3的EDTA溶液 ( 3mmolkg- 1 )显著地增加了土壤溶液铜 ,特别是难解离态铜的含量 ,其消长规律与土壤溶液TOC的变化相一致 ,也显著地增加土壤NH4NO3提取态和NH4OAc提取态铜量 ,但对芥菜生长没有显著影响。EDTA的加入显著地增加芥菜各组织铜浓度和铜吸收量 ,从而增加了芥菜的铜总吸收量 ,提高了植物修复效率。施用 3mmolkg- 1 pH6.3的草酸。
Pot experiment was conducted t o study the effects of EDTA and organic acids with lower molecular weight on the properties of soil solution,the form distribution of Cu in the soil and Cu upta ke by Indian mustard( Brassica juncea ).Results showed that the total concentr ation of Cu and especially the nonlabile Cu in soil solution significantly incre ased after the addition of 3 mmol kg -1 of EDTA,it had a good relationship w ith the total organic carbon (TOC)in the soil solution.EDTA increased the conten ts of NH 4NO 3 extractable and NH 4OAc extractable in the soil solid phase. The addition of EDTA did not affect the growth of Indian mustard,but significant ly increased the concentrations of Cu in the leaves,stems and roots of the plant s.Therefore,the Cu uptake by Indian mustard was greatly enhanced and the remedia tion efficiency improved signficantly.The addition of 3 mmol kg -1 oxalic ac id,citric acid or malic acid had no effect on the Cu concentrations in different fractions in the aqueous and solid phase of soil,and on the plant growth and Cu uptake by Indian mustard.
出处
《土壤学报》
CAS
CSCD
北大核心
2002年第5期679-685,共7页
Acta Pedologica Sinica
基金
江苏省青年科技基金 (BQ980 5 0 )
国家自然科学基金 (4 983 1 0 7040 0 0 1 0 1 3 )
国家重点基础研究发展规划项目(G1 9990 1 1 80 7)资助
