| 柠檬酸及刈割强化象草修复镉污染土壤的效应 |
| 摘要点击 1391 全文点击 432 投稿时间：2021-12-02 修订日期：2022-01-29 |
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| 中文关键词 象草 镉(Cd) 柠檬酸 刈割 修复 |
| 英文关键词 napier grass (Pennisetum purpureum Schum) cadmium(Cd) citric acid mowing phytoremediation |
| 作者 | 单位 | E-mail | | 唐棋 | 中南林业科技大学环境科学与工程学院, 长沙 410004 | TQ1633895@163.com | | 伍港繁 | 中南林业科技大学环境科学与工程学院, 长沙 410004 | | | 辜娇峰 | 中南林业科技大学环境科学与工程学院, 长沙 410004
稻米品质安全控制湖南省工程实验室, 长沙 410004 | gujiaofeng@163.com | | 周航 | 中南林业科技大学环境科学与工程学院, 长沙 410004
稻米品质安全控制湖南省工程实验室, 长沙 410004 | | | 曾鹏 | 中南林业科技大学环境科学与工程学院, 长沙 410004
稻米品质安全控制湖南省工程实验室, 长沙 410004 | | | 廖柏寒 | 中南林业科技大学环境科学与工程学院, 长沙 410004
稻米品质安全控制湖南省工程实验室, 长沙 410004 | |
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| 中文摘要 |
| 为研究低分子有机酸柠檬酸与农艺措施刈割强化象草修复镉（Cd）污染土壤的效应，开展象草盆栽种植试验.试验中柠檬酸设置单次1.25、2.5和5 mmol·kg-1施用水平；刈割设置0、1和2次.结果表明：①在柠檬酸施用量为1.25 mmol·kg-1且刈割1次时，象草地上部生物量增幅最大达39.11%，高剂量柠檬酸施用和多次刈割不利于生物量的增长；②柠檬酸施用和刈割均有增大象草茎和叶Cd含量的效应，刈割措施中最后一茬收获的象草茎Cd含量较大，且在mB（柠檬酸）5 mmol·kg-1施用下可将茎ω（Cd）增大到18.53 mg·kg-1，相比第一茬增大约6倍；③柠檬酸施用和刈割措施能够降低象草根际土壤pH和有机质，对土壤总Cd含量和Cd的TCLP含量也能分别最大幅度降低14.29%和10.17%；④在mB（柠檬酸）施用量为1.25 mmol·kg-1且刈割1次时，象草植物提取Cd的效果最佳，地上部位Cd提取量达到6.95 mg·株-1，占盆栽试供土壤Cd总量的9.38%.未来利用象草修复Cd污染土壤时，可考虑将1.25 mmol·kg-1柠檬酸施用和刈割1次相结合，以提高修复效率. |
| 英文摘要 |
| A pot experiment was conducted to investigate the effects of citric acid application and mowing frequency on the remediation of cadmium (Cd) contaminated soil by napier grass (Pennisetum purpureum Schum). Three levels of citric acid were divided into three applications of 1.25, 2.5, and 5 mmol·kg-1. The mowing frequency of the plants was divided into no mowing, one mowing, and two mowing treatments. The results showed that:① 1.25 mmol·kg-1 citric acid increased the biomass of the upper part of the plant by 39.11% with one mowing, and multiple mowing treatments and high citric acid application were not beneficial to the biomass increase. ② Both citric acid application and mowing had the effect of increasing the Cd content in stems and leaves, and Cd content in stems harvested in the last mown crop was larger and increased by approximately six times under the 5 mmol·kg-1 citric acid application. ③ Citric acid application and mowing reduced the rhizosphere soil pH and organic matter and also reduced the total soil Cd content and TCLP-Cd content by a maximum of 14.29% and 10.17%, respectively. ④ Under the 1.25 mmol·kg-1citric acid application and one mowing treatment (L1), the best Cd extraction by Napier grass was achieved with 6.95 mg·plant-1 of above-ground parts, accounting for 9.38% of the total Cd content in the potted test soil. Therefore, the L1 treatment can be considered to improve the remediation efficiency when using napier grass to remediate Cd-contaminated soil in the future. |
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