谷氨酸N,N-二乙酸及液体肥联合强化对东南景天修复重金属污染土壤的影响  

Effects of L-glutamic Acid N,N-diacetic Acid(GLDA)and Liquid Fertilizer on Phytoremediation of Heavy Metal Contaminated Soils by Sedum alfredii

作　　者：陈亦铎 曾非凡 林贤柯 梁源芳 陈杨梅[1] 邓兰生[1] 吴启堂[1] 卫泽斌[1] CHEN Yiduo;ZENG Feifan;LIN Xianke;LIANG Yuanfang;CHEN Yangmei;DENG Lansheng;WU Qitang;WEI Zebin(College of Natural Resources and Environment,South China Agricultural University,Guangzhou 510642)

机构地区：[1]华南农业大学资源环境学院,广州510642

出　　处：《水土保持学报》2021年第3期378-383,共6页Journal of Soil and Water Conservation

基　　金：广东特支项目本土创新团队项目(2019BT02L218);广东省科技计划项目(2018B030324003)。

摘　　要：化学强化可提高超富集植物对土壤重金属的提取效果。采用盆栽试验,研究了可生物降解螯合剂谷氨酸N,N-二乙酸(GLDA)、液体肥的不同用量及复配使用对超富集植物东南景天吸收土壤重金属Cd、Zn的影响,并探讨了其渗滤液对环境的风险。结果表明:单一使用GLDA或者液体肥均能提高东南景天对土壤Cd、Zn的提取效率,其中1.25 mmol/kg GLDA处理的Cd、Zn提取量分别是空白处理的1.36,1.46倍,0.5 g/kg液体肥处理的Cd、Zn提取量分别是空白处理的1.40,1.43倍,这2种低用量单独使用的处理对Cd提取效率最高,达到41%~42%,且对应的渗滤液重金属含量均比空白处理要低,其环境风险较小。GLDA与较高用量(2 g/kg土)液体肥复配时,其东南景天对土壤Cd、Zn的提取量与空白处理相比有所下降。结果表明,GLDA和液体肥在强化植物修复方面有明显潜力,而且以低剂量单独使用强化效果较佳,值得进一步的田间试验核实。Chemical enhancement can improve the heavy metal phytoextraction efficiency of hyperaccumulator from soil.A pot experiment was conducted to study the effects of different dosage and combinations of biodegradable chelating agents L-glutamic acid N,N-diacetic acid(GLDA)and liquid fertilizer on the absorption of Cd and Zn by hyperaccumulator Sedum alfredi,and evaluate the environmental risk of their leachate.The results showed that the single use of GLDA or liquid fertilizer both increased the extraction efficiency of Cd and Zn of Sedum alfredii.The phytoextraction of Cd and Zn in the treatment with 1.25 mmol/kg GLDA was 1.36 and 1.46 times as much as that of the control,respectively,and the treatment with 0.5 g/kg liquid fertilizer also increased phytoextraction of Cd and Zn by 1.40 and 1.43 times,respectively.The treatment with low dose of GLDA or liquid fertilizer resulted in highest Cd phytoextraction efficiency,which reached 41%to 42%.The concentration of heavy metal in the corresponding leachates of these two treatments were also lower than that of the control,indicating lower environmental risk.When the high dose of liquid fertilizer(2 g/kg)was combined with GLDA,the phytoextraction of Cd and Zn by S.alfredii was lower than that of the control.These results indicated that GLDA and liquid fertilizer had potential to enhance phytoremediation of S.alfredii,and it was better to use these two reagents separately and in low dosage.These preliminary conclusion needs further verification with field experiments.

关 键 词：植物提取 GLDA 液体肥 东南景天 重金属 

分 类 号：X53[环境科学与工程—环境工程] X173