池塘水力停留时间和氮素分层滞留能力分析

文雯; 张名瑶; 钟泳林; 高绣纺; 吕明权; 吴胜军

文章摘要

文雯,张名瑶,钟泳林,高绣纺,吕明权,吴胜军.池塘水力停留时间和氮素分层滞留能力分析[J].农业环境科学学报,2022,41(10):2277-2286.

池塘水力停留时间和氮素分层滞留能力分析

Analysis of pond water retention time and retention capacity of nitrogen stratification

投稿时间：2022-04-04 修订日期：2022-05-25

DOI：10.11654/jaes.2022-0329

中文关键词: 池塘水力滞留氮养分滞留停留时间分布（RTD） TASCC方法

英文关键词: pond hydraulic retention nitrogen retention residence time distribution（RTD） TASCC method

基金项目:国家自然科学基金项目(42071242);重庆市科技局项目(cstc2021jxj10091);中央引导地方科技发展专项资金项目(2021000069)

作者	单位	E-mail
文雯	长江大学, 武汉 430000 中国科学院重庆绿色智能技术研究院, 重庆 400714
张名瑶	长江大学, 武汉 430000 中国科学院重庆绿色智能技术研究院, 重庆 400714
钟泳林	中国科学院重庆绿色智能技术研究院, 重庆 400714
高绣纺	长江大学, 武汉 430000
吕明权	中国科学院重庆绿色智能技术研究院, 重庆 400714	lvmingquan@cigit.ac.cn
吴胜军	中国科学院重庆绿色智能技术研究院, 重庆 400714

摘要点击次数: 872

全文下载次数: 886

中文摘要:

为揭示池塘不同深度的水力滞留能力和氮素养分吸收滞留特征，在重庆市北碚区碑湾流域筛选一池塘作为试验塘，于冬季开展野外脉冲示踪试验。在此基础上，采用水力停留时间分布方法，对水力滞留能力进行评价分析，同时利用基于养分螺旋原理的TASCC方法，开展硝态氮滞留能力特征分析。结果表明：（1）池塘底层的营养盐浓度要高于上层，且底层的营养盐滞留能力强于上层，进入池塘的大部分氮素随水流从底层缓慢流经并聚积在塘底，少部分从上层快速流走，便于后续氮素去除；（2）池塘充分混匀后各层的NO₃^--N背景浓度吸收速率的变化范围为2.50~9.13 μg·m^-2·s^-1，NO₃^--N背景浓度吸收速度的变化范围为0.12~0.40m·s^-1，池塘的整个上覆水都对氮素进行吸收转化，滞留在底层的氮素在上覆水-沉积物间不断交换，进行硝化反硝化等作用，减少农业非点源氮素污染。

英文摘要:

To reveal the characteristics of water retention capacity and nitrogen retention at different pond depths, an experimental pond in Beibei District, Chongqing City was selected and the field pulse tracer experiment was carried out in winter. The residence time distribution was adopted to evaluate and analyze the hydraulic retention capacity. Characteristics of nitrate nitrogen retention capacity were analyzed by the additions of tracer additions TASCC method based on nutrient spiral principle . The concentration of nutrients in the bottom layer of the pond was higher than that in the upper layer, and the retention capacity of nutrients in the bottom layer was stronger than that in the upper layer. Most of the nitrogen entering the pond flowed slowly through the bottom and accumulated in the bottom of the pond with water flow. The remainder flowed away quickly from the upper layer, facilitating subsequent nitrogen removal. In the background concentration, the absorption rate of NO₃^--N background concentration of each layer depth varied from 2.50 to 9.13 μg·m^-2·s^-1, the absorption rate of NO₃^--N background concentration ranged from 0.12 to 0.40 m·s^-1, the entire overlying water of the pond absorbed and transformed nitrogen, and the nitrogen trapped in the bottom layer was constantly exchanged between the overlying water and sediment to perform nitrification and denitrification, and reduce nitrogen pollution from the agricultural non-point sources.

HTML 查看全文查看/发表评论下载PDF阅读器