摘要
用室内土培试验方法,研究在采自田间的Pb、Cd、As、Zn和Cu复合污染土壤上种植大叶井口边草条件下,外源分别添加0、1.5、3、6、12 mmol/kg乙二胺二琥珀酸(EDDS)、氨三乙酸(NTA)和乙二胺四乙酸(EDTA)对大叶井口边草吸收Pb、Cd和As的影响。结果表明,3种螯合剂处理对大叶井口边草生物量没有显著影响,说明大叶井口边草对3种螯合剂耐性较强;6、12 mmol/kg EDTA处理能极显著提高土壤Pb有效态浓度,进而促进大叶井口边草对Pb的吸收。大叶井口边草地上部Pb吸收量最高达(47.4±1.7)mg/kg,是对照的3.66倍。6、12 mmol/kg EDTA处理能极显著地提高土壤中Cd的有效性,但未促进大井口边草地上部对Cd吸收。6 mmol/kg EDDS和3 mmol/kg NTA显著提高了土壤中As有效态浓度,进而提高大叶井口边草地上部对As的吸收,大叶井口边草地上部吸收As最高达(276±10)mg/kg。6 mmol/kg EDTA和6 mmol/kg EDDS处理下大叶井口边草提取的Pb、As量最大,分别为(317±53)μg/盆和(873±41)μg/盆,说明6 mmol/kg EDDS处理下大叶井口边草对复合污染土壤中As的修复具有较大的潜力。
Chemically enhanced phytoextraction has been proposed as an effective approach to remove heavy metals from contaminated soil. Pot experiments was conducted to evaluate the effects of ethylene diamine disuccinate（EDDS）,ethylene diamine tetraacetate（EDTA） and nitrilotriacetic acid（NTA） on the uptake of heavy metals（Pb,Cd and As） from multiple metal-contaminated field soils with Pteris crelica var. nervosa.Each chelant was applied to soil pots cultivated with P.crelica var.nervosa at the rates of 0,1.5,3,6,12 mmol/kg.The results showed that all tested Chelators induced no significant effects on biomass,which indicated that P.crelica var.nervosa was high tolerant to tested Chelators.The application of 6,12 mmol/kg EDTA significantly increased soil Pb bioavailability and the concentrations of Pb of P.crelica var.nervosa.The maximum Pb concentrations reached（47.4±1.7） mg/kg in shoot of P.crelica var.nervosa which was 3.66 times higher than that in CK with no chelators were applied.Additionally,the application of 6,12 mmol/kg EDTA also significantly increased soil Cd bioavailability but did not significantly affect Cd concentrations in shoots of tested plant.The application of 6 mmol/kg EDDS and 3 mmol/kg NTA significantly increased soil As bioavailability as well as the concentrations of As in shoots of tested plant.The maximum As concentrations reached（276±10） mg/kg in shoot of P.crelica var.nervosa.The uptakes of Pb and As in P.crelica var.nervosa respectively exposed to 6 mmol/kg EDTA and 6 mmol/kg EDDS reached （317±53） ug/pot and（873±41） ug/pot.
出处
《土壤》
CAS
CSCD
北大核心
2012年第2期282-289,共8页
Soils
基金
国家环境保护科技项目(E-2007-06)
云南省环境保护专项项目(2007[262])
云南省教育厅科学研究基金重点项目(09Z0019)资助
关键词
植物提取
大叶井口边草
重金属
螯合剂
Phytoextraction
Pteris cretica var nervosa
Heavy metal
Chelators
