Compounded chelating agent derived from fruit residue extracts effectively enhances Cd phytoextraction by Sedum alfredii  

作　　者：Jipeng Luo Jiabin Liang Yuchao Song Xinyu Guo Youzheng Ning Nanlin Liu Heping Zhao Tingqiang Li 

机构地区：[1]Ministry of Education Key Laboratory of Environmental Remediation and Ecological Health,College of Environmental and Resource Sciences,Zhejiang University,Hangzhou 310058,China [2]Zhejiang Provincial Key Laboratory of Agricultural Resources and Environment,Hangzhou 310058,China [3]National Demonstration Center for Experimental Environment and Resources Education,Zhejiang University,Hangzhou 310058,China [4]Department of Plant Sciences,University of Cambridge,Cambridge CB23EA,UK

出　　处：《Soil Ecology Letters》2021年第3期253-265,共13页土壤生态学快报（英文）

基　　金：the National Natural Science Foundation of China(41671315,41977107);National Postdoctoral Program for Innovative Talents(BX20200293);Zhejiang Provincial Natural Science Foundation of China(LZ18D010001);National Key Research and Development Project of China(2016YFD0800802);the Fundamental Research Funds for the Central Universities,China's Agriculture Research System(CARS-04);Fundamental Research Funds for the Central Universities(2020FZZX001-06).

摘　　要：Chelating agent is known as the enhancer for metal phytoextraction;however,there is still a lack of efficient and environmentally sustainable chelators.Here,lemon residue extraction(LRE),prepared from 11 kinds of fruit wastes,was combined with N,N-bis(carboxymethyl)glutamic acid(GLDA),and tea saponin(T.S.)for the compounded plant-derived chelator(CPC),and their influences on Cd phytoextraction by the hyperaccumulator Sedum alfredii was evaluated.Among these fruits,the lemon residue extracted the most significant amount of Cd from the soil.The most effective CPC was at the volume ratio of three agents being 15:4:1(LRE:GLDA:T.S.).Compared with the deionized water,the solubility of three Cd minerals was increased by 85–256 times,and Cd speciation was substantially altered after CPC application.In the pot experiment,CPC addition caused evident increases in plant shoot biomass,Cd phytoextraction efficiency,and organic matter content compared with EDTA and nitrilotriacetic acid(NTA)application.CPC induced fewer changes in bacterial community composition compared with EDTA and had no pronounced influence on microbial biomass carbon and bacterialα-diversity,suggesting CPC had a subtle impact on the microbiological environments.Our study provides a theoretical base for the reutilization of fruit wastes and the development of environmental-friendly chelator that assists Cd phytoextraction.

关 键 词：Compounded plant-derived chelator Fruit residue Cadmium PHYTOEXTRACTION Sedum alfredii 

分 类 号：X53[环境科学与工程—环境工程]