农业环境科学学报2011，Vol.30Issue(4)：666-676,11.
间作条件下螯合剂对龙葵和大叶井口边草吸收重金属的影响
Effects of Chelators on the Uptake of Heavy Metals by Solanum nigrum and Pteris cretica var. Nervosa Growing in an Intercropping System
摘要
Abstract
Enhancing phytoextraction of heavy metals has been proposed as an effective approach to remove heavy metals from contaminated soils. Plants with different metal-hyperaccumulative characteristics, namely Solanum nigrum and Pteris cretica var. nervosa, were monocropped or intercropped in multiple-metal contaminated field soils in this study. This line of study aims to investigate, compared with monocropping method, whether intercropping method could improve metal uptake by these two tested plants. The effects of ethylene diamine disuccinate (EDDS), ethylene diamine tetraacetate (EDTA) and nitrilotriacetic acid (NTA) on uptake of heavy metals (Pb, Cd and As) by plants growing in an intercropping system were also investigated using the same soil. Compared with monocropping method, intercropping method increased Cd concentration 1.3 times and As concentration 1.4 times in shoots of S.nigrum and P. cretica var. nervosa, respectively.This result indicated that intercropping method could significantly improve heavy metal uptake by hyperaccumulators. Much higher tolerance to chelators was observed in P. cretica var. nervosa than that in S. nigrum in the intercropping system. The application of 3, 6, 12 mmol· kg-1 EDTA to soil contaminated with heavy metals significantly increased soil Pb, Cd bioavailability and concentrations of Pb in two intercropped plants. The maximum Pb concentrations reached 27.58 mg ·kg-1 and 26.17 mg ·kg-1 in S. nigrum and P. cretica var. nervosa, respectively,which were 3.3 times and 3 times higher than that in the corresponding control plants to which no chelators were applied. Under the conditions of the intercropping system, the application of 3, 6, 12 mmol· kg-1 EDTA also significantly increased Cd concentration in the shoot of P.cretica var. nervosa. EDTA was more effective than NTA in increasing soil Pb, Cd bioavailability, but was less effective than NTA in increasing soil As bioavailability. The application of 1.5 mmol· kg-1 and 3 mmol· kg-1 NTA significantly increased soil As bioavailability as well as the concentrations of As in shoots of two tested plants.关键词
螯合剂/重金属/植物提取/龙葵/大叶井门边草/间作Key words
chelator/ heavy metal/ phytoextraction/ Pteris cretica var. nervosa/ Solanum nigrum L./ intercropping分类
资源环境引用本文复制引用
熊国焕,高建培,王宏镔,潘义宏,焦鹏..间作条件下螯合剂对龙葵和大叶井口边草吸收重金属的影响[J].农业环境科学学报,2011,30(4):666-676,11.基金项目
国家环境保护科技项目(E-2007-06) （E-2007-06）
云南省环境保护专项项目(2007[262]) （2007[262]）
云南省教育厅科学研究基金重点项目(09Z0019) （09Z0019）
