复合螯合剂对籽粒苋修复镉污染农田的影响  

Effect of Compound Chelating Agent on Remediation of Cadmium Contaminated Farmland by Amaranthus hypochondriacus L.

作　　者：周峻宇 谷雨[1] 唐珍琦[2] 吴海勇[1] 刘琼峰[1] 李明德[1] ZHOU Junyu;GU Yu;TANG Zhenqi;WU Haiyong;LIU Qiongfeng;LI Mingde(Hunan Soil and Fertilizer Institute,Changsha 410125,China;Hunan Soil and Fertilizer Station,Changsha 410006,China)

机构地区：[1]湖南省土壤肥料研究所,长沙410125 [2]湖南省土壤肥料工作站,长沙410006

出　　处：《中国农业科技导报》2023年第12期186-194,共9页Journal of Agricultural Science and Technology

基　　金：湖南省土壤肥料研究所所长基金项目(2020tfs203);湖南省自然科学基金项目(2020JJ5320);湖南省农业科技创新资金项目(2019LS03-4);湖南重金属污染耕地治理式休耕试点区耕地质量监测项目(湘财农指[2017]153号,湘财农指[2018]83号)。

摘　　要：为提高籽粒苋对农田土壤重金属富集的提取效率,基于田间原位试验,研究了谷氨酸二乙酸四钠([N,N]-bis glutamic acid,GLDA)和次氮基三乙酸(nitrilotriacetic acid,NTA)及其组合(GLDA-NTA)对籽粒苋修复轻中度镉(Cd)污染农田土壤的影响。结果表明,施用GLDA、NTA及GLDA-NTA处理对籽粒苋地上部生物量、Cd富集系数与转运系数、地上部Cd提取量及根际土Cd形态分布等影响不一。与不施螯合剂相比,施用螯合剂处理籽粒苋地上部生物量均无显著变化;3种螯合剂处理对籽粒苋Cd富集系数与转运系数及地上部Cd提取量产生了不同程度的影响,其中GLDA-NTA处理效果最为明显,富集系数、转运系数及地上部Cd提取量显著提高40.83%、15.00%及179.67%。此外,施用GLDA、NTA及GLDA-NTA处理对根际土Cd形态分布影响程度不一,其中以GLDA-NTA处理最为明显,水溶态、酸溶态、可还原态、可氧化态及残渣态占比变化率分别为3.28%、22.09%、-26.28%、-1.33%及2.24%。因此,复合螯合剂联合籽粒苋植物修复可高效活化重金属,提升植株对农田土壤Cd的提取效率,是一种具有前景性、绿色性及可借鉴性的Cd污染联合修复方法,对轻中度Cd污染农田治理具有重要的参考价值和指导意义。In order to enhance the enrichment and extraction efficiency of Amaranthus hypochondriacus L.for heavy metals in farmland soil,the effects of[N,N]-bis glutamic acid(GLDA),nitrilotriacetic acid(NTA)and their combinations(GLDA-NTA)on the remediation of the low to moderate cadmium(Cd)contaminated farmland soil by Amaranthus hypochondriacus L.were studied based on field in situ experiment.The results showed that the application of GLDA,NTA and GLDA-NTA treatments had different influences on the above-ground biomass,Cd bioconcentration and translocation factor,above-ground Cd extract quantity and Cd morphology distribution in rhizosphere soil.Compared with no chelating agent treatment,there were no significant changes in above-ground biomass of Amaranthus hypochondriacus L.treated with chelating agents.The 3 kinds of chelating agent treatments had different degrees of influences on Cd bioconcentration and translocation factor,the Cd extract quantity from the above ground,of which the effect of GLDA-NTA treatment was the most obvious,the bioconcentration factor,translocation factor and above-ground Cd extract quantity were significantly increased by 40.83%,15.00%and 179.67%.In addition,the application of GLDA,NTA and GLDA-NTA treatments had different degrees of influence on the Cd activity of rhizosphere soil,of which GLDA-NTA treatment was the most obvious,the changes in proportion of water-soluble,acid-soluble,reducible,oxidizable and residual state accounted for 3.28%,22.09%,-26.28%,-1.33%and 2.24%,respectively.Therefore,complex chelating agents combined with plant remediation by Amaranthus hypochondriacus L.could effectively activate heavy metals and improve the plant extraction efficiency of Cd in farmland soil,it was a promising,greenness and reference of combined remediation method for Cd pollution,which had important reference value and guiding significance for the treatment of low to moderate Cd polluted farmland.

关 键 词：复合螯合剂 籽粒苋 土壤修复 镉污染农田 

分 类 号：S156[农业科学—土壤学] X53[农业科学—农业基础科学]