摘要
为探究己酸二乙氨基乙醇酯(胺鲜酯,DA-6)与谷氨酸二乙酸四钠(GLDA)联用对柳枝稷修复镉(Cd)污染土壤的影响,通过田间试验研究不同DA-6浓度(0和10μmol·L^-1)与不同GLDA施用方式(60 d内将600、1200和2400 kg·hm^-2依次分为1、2和4次施加,分施2和4次的单次间隔时间分别为30 d和15 d)联合对土壤p H及可溶性有机碳(DOC)、柳枝稷生物量及Cd含量、Cd提取量、土壤总Cd及有效态Cd(DTPA-Cd)的影响.结果表明:①DA-6与GLDA联用能提高土壤p H和DOC,且p H和DOC随着GLDA施用量增加而显著增加;②DA-6与GLDA联用能显著提高柳枝稷生物量及Cd含量,其中DA-6和GLDA的施用量与施用次数是影响生物量及Cd含量的最关键因素;③柳枝稷Cd提取量在DA-6浓度为10μmol·L^-1和分4次施加1200 kg·hm^-2GLDA时最高,为22.18 g·hm^-2,较CK(不施加DA-6和GLDA)及10D0(仅叶喷10μmol·L^-1DA-6)分别提高了1.93倍和1.23倍;④土壤总Cd在DA-6浓度为10μmol·L^-1和分2次施加2400 kg·hm^-2GLDA时最低,为0.529mg·kg^-1,较CK与10D0分别降低21.04%和18.23%.因此,DA-6与GLDA联用能进一步强化柳枝稷修复Cd污染农田.
To reveal the effects of diethyl aminoethyl hexanoate(DA-6)combined with L-Glutamic acid,N,N-diacetic acid(GLDA)on the remediation of Cd contaminated soils by Panicum virgatum L.,different GLDA application methods with total application doses of 600,1200,and 2400 kg·hm^-2 equally divided 1,2,and 4 times,respectively,were studied on the basis of DA-6 concentrations of 0 and 10μmol·L^-1,and application intervals(2 and 4 times)were 30 and 15 days,respectively,over 60 days.Soil p H,dissolved organic carbon(DOC),biomass and Cd contents,Cd extraction,total Cd,and available Cd(DTPA-Cd)were analyzed.The results showed that first,the combination of DA-6 and GLDA could improve soil p H and DOC,and the p H and DOC increased significantly with increased GLDA application.Secondly,the combination of DA-6 and GLDA could significantly improve the biomass and Cd contents of Panicum virgatum L.,and for DA-6,the amounts and times of GLDA application were the most important factors affecting the biomass and Cd contents.Third,the highest amount of Cd extracted was 22.18 g·hm^-2 at 1200 kg·hm^-2 GLDA applied 4 times and 10μmol·L^-1 DA-6,which was 1.93 times higher than CK(wherein no DA-6 and GLDA were applied)and 1.23 times higher than 10 D0(in which only DA-6 was applied).Finally,the lowest soil total Cd was 0.529 mg·kg^-1 at 2400 kg·hm^-2 GLDA applied2 times and 10μmol·L^-1 DA-6,which was 21.04%lower than CK and 18.23%lower than 10 D0.Therefore,the combination of DA-6 and GLDA can further strengthen the recovery of Cd contaminated farmlands via Panicum virgatum L..
作者
王正
孙兆军
Sameh Mohamed
王珍
何俊
韩磊
WANG Zheng;SUN Zhao-jun;Sameh Mohamed;WANG Zhen;HE Jun;HAN Lei(School of Civil and Hydraulic Engineering,Ningxia University,Yinchuan 750021,China;Xinhua College,Ningxia University,Yinchuan 750021,China;Institute of Environmental Engineering,Ningxia University,Yinchuan 750021,China;National Research Centre of Egypt,Cairo 11435,Egypt)
出处
《环境科学》
EI
CAS
CSCD
北大核心
2020年第12期5589-5599,共11页
Environmental Science
基金
宁夏重点研发计划项目(2018BFG02016,2018BEB04010)
国家自然科学基金项目(31660133,31460220)。
