5种水生植物对模拟菜地径流中总氮和硝氮净化效果

邵凯迪; 段婧婧; 薛利红; 薛利祥; 周贝贝; 徐德福

doi:10.12153/j.issn.1674-991X.20190160

5种水生植物对模拟菜地径流中总氮和硝氮净化效果

doi: 10.12153/j.issn.1674-991X.20190160

^1. 南京信息工程大学环境科学与工程学院
^2. 农业部长江下游平原农业环境重点实验室,江苏省农业科学院农业资源与环境研究所

详细信息

作者简介:
邵凯迪(1994—),男,硕士研究生,研究方向为水污染治理,kdShao@163.com

通讯作者:
薛利红 E-mail: njxuelihong@gmail.com

中图分类号: X524
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出版历程
- 收稿日期: 2019-09-12
- 刊出日期: 2020-05-20

Purification effect of five kinds of hydrophytes on total nitrogen and nitrate in simulated vegetable field runoff water

^1. School of Environmental Science and Engineering, Nanjing University of Information Science & Technology
^2. Key Laboratory of Agro-Environment in Downstream of Yangtze Plain, Ministry of Agriculture, Institute of Resources and Environment, Jiangsu Academy of Agriculture Science

More Information

Corresponding author: XUE Lihong E-mail: njxuelihong@gmail.com

摘要

摘要: 近年来,太湖地区蔬菜大棚种植面积日益增加,高施肥量造成菜地土壤硝氮( $NO 3 -$ -N)积累严重,夏季揭棚期菜地在降雨初期会产生高浓度 $NO 3 -$ -N(富硝)的地表径流。为净化菜地富硝地表径流,选取苦草、伊乐藻、黄花水龙、狐尾藻和铜钱草5种常见水生植物,开展了模拟富硝地表径流的箱内净化试验。结果表明:在模拟径流总氮(TN)浓度为6.32~6.80 mg/L、 $NO 3 -$ -N浓度为4.76~5.09 mg/L时,5种水生植物在试验初期(第1周)均表现出较好的氮去除效果,TN和 $NO 3 -$ -N去除率分别超过80%和90%,试验后期(第3、4周)苦草、伊乐藻和铜钱草对TN、 $NO 3 -$ -N的去除率明显下降,而黄花水龙和狐尾藻仍保持较高的 $NO 3 -$ -N去除率(90%以上);在模拟径流TN浓度为15.62~18.00 mg/L, $NO 3 -$ -N浓度为13.19~13.96 mg/L时,5种水生植物的生长均受到不同程度的胁迫,但黄花水龙和狐尾藻对氮去除能力显著高于其他植物;黄花水龙和狐尾藻具有较大的生物量,使其具有良好的氮去除能力,2种植物通过反硝化等途径去除的氮在不同处理间无显著差异,黄花水龙和狐尾藻较适宜净化富硝地表径流。
- 水生植物 /
- 硝态氮 /
- 菜地径流 /
- 黄花水龙 /
- 狐尾藻
Abstract: In recent years, the planting area of vegetable greenhouse in Taihu Lake region had been increasing, and the high amount of fertilization had resulted in serious nitrate ( $N O 3 -$ -N) accumulation in vegetable soils. Nitrate was abundant in surface runoff at the beginning of rainfall during the opening of greenhouse in summer. In order to purify the surface runoff of vegetable field rich in $N O 3 -$ -N, a static simulated experiment with five common kinds of hydrophyte of Vallisneria natans, Elodea nuttallii, Ludwigia peploides, Myriophyllum verticillatum L. and Hydrocotyle chinensis in a tank containing simulated nitrate-rich runoff water was carried out. Results showed that at low $N O 3 -$ -N concentration with TN of 6.32-6.80 mg/L and $N O 3 -$ -N of 4.76-5.09 mg/L, all the five hydrophytes showed good removal effects in the early stage (the first week) with the removal rates of TN and $NO 3 -$ -N over 80% and 90%, respectively. But in the late stage (the third and fourth week), the removal rate of TN and $NO 3 -$ -N by Vallisneria natans, Elodea nuttallii and Hydrocotyle chinensis decreased obviously, while Ludwigia peploides and Myriophyllum verticillatum L. still maintained high $NO 3 -$ -N removal rate (over 90%). At high $NO 3 -$ -N concentration with TN of 15.62-18.00 mg/L and $N O 3 -$ -N of 13.19-13.96 mg/L, the growth of five hydrophytes all showed different degrees of stress. However, Ludwigia peploides and Myriophyllum verticillatum L. still maintained higher nitrogen removal capacity, which was mainly attributed to the large biomass and nitrogen uptake. There was no significant difference in nitrogen removal by denitrification between different treatments, therefore, Ludwigia peploides and Myriophyllum verticillatum L. were more suitable to purify the runoff water with high nitrate concentration.
- hydrophyte /
- nitrate nitrogen /
- vegetable fields runoff /
- Ludwigia peploides /
- Myriophyllum verticillatum L.

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