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排灌机械工程学报
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排灌机械工程学报  0, Vol. Issue (): 22-    DOI:
农业水土工程 最新目录 | 下期目录 | 过刊浏览 | 高级检索 Previous Articles  |  Next Articles  
生态农沟-湿地系统对稻田低碳氮比排水中氮素的去除效果
和玉璞
Nitrogen removal in eco-ditch and wetland system treating paddy field drainage with low carbon-to-nitrogen ratio
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摘要 为研究灌排调控下生态农沟-湿地系统对稻田排水中氮素的原位削减效果,探讨低碳氮比对于系统氮素去除效果的影响。依据大田试验观测资料,分析了控制灌排模式下生态农沟-湿地系统水体中氮素浓度变化规律和碳氮比分布特征。结果表明,控制灌排模式下生态农沟-湿地系统对稻田排水中氮素去除效果显著,施肥后排水中TN、NH4+-N和NO3-_N浓度出现峰值,在农沟拦蓄后浓度大幅下降,氮素平均去除率分别为63.9%、67.8%和83.2%。进入湿地再次净化后,氮素浓度进一步降低,平均去除率分别为47.7%、44.3%和82.0%。控制灌排模式下系统水体中有机质对水环境影响较小,水体碳氮比水平总体偏低。控制灌排模式下生态农沟-湿地系统很好的实现了对氮素的原位削减,低碳氮比对于系统氮素去除效果的影响不大。
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关键词生态农沟-湿地系统   灌排调控   稻田   排水   氮素   碳氮比     
Abstract: In order to investigate the nitrogen removal performance and how it response to low carbon-to-nitrogen in eco-ditch and wetland system under controlled irrigation and drainage. Based on field experiment data, the changes of nitrogen concentration and carbon-to-nitrogen in the eco-ditch and wetland system were monitored. Results showed that TN、NH4+-N and NO3-_N concentration in drainage were peaking after fertilization and then were significantly reduced after retaining in the eco-ditch. The eco-ditch obtained 63.9% TN, 67.8% NH4+-N and 83.2% NO3-_N removal. Nitrogen concentration reduced further after purification in wetland, with the average removal rate of 47.7%、44.3% and 82.0% for TN, NH4+-N and NO3-_N. The influence of organic matter in the system on water quality is little, the carbon-to-nitrogen ratio maintained low. The eco-ditch and wetland system under controlled irrigation and drainage are effective in removing nitrogen in paddy field drainage, and the influence of low carbon-to-nitrogen on nitrogen removal efficiencies is little.
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. 生态农沟-湿地系统对稻田低碳氮比排水中氮素的去除效果[J]. 排灌机械工程学报, 0, (): 22-.
. Nitrogen removal in eco-ditch and wetland system treating paddy field drainage with low carbon-to-nitrogen ratio[J]. Journal of Drainage and Irrigation Machinery Engin, 0, (): 22-.
 
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