| 胺鲜酯与螯合剂GLDA联合强化柳枝稷吸收积累镉效果 |
| 摘要点击 1712 全文点击 562 投稿时间：2020-04-08 修订日期：2020-06-11 |
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| 中文关键词 植物修复 重金属 可生物降解螯合剂 柳枝稷 己酸二乙氨基乙醇酯(DA-6) 富集 |
| 英文关键词 phytoremediation heavy metals biodegradable chelate GLDA Panicum virgatum L. diethyl aminoethyl hexanoate (DA-6) accumulation |
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| 中文摘要 |
| 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pH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：① DA-6与GLDA联用能提高土壤pH和DOC，且pH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-1 DA-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. |
| 英文摘要 |
| 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-2equally divided 1, 2, and 4 times, respectively, were studied on the basis of DA-6 concentrations of 0 and 10 μmol·L-1, and application intervals (2 and 4 times) were 30 and 15 days, respectively, over 60 days. Soil pH, 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 pH and DOC, and the pH 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 22.18g·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 10D0 (in which only DA-6 was applied). Finally, the lowest soil total Cd was 0.529mg·kg-1 at 2400 kg·hm-2 GLDA applied 2 times and 10 μmol·L-1 DA-6, which was 21.04% lower than CK and 18.23% lower than 10D0. Therefore, the combination of DA-6 and GLDA can further strengthen the recovery of Cd contaminated farmlands via Panicum virgatum L.. |
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