生态沟-湿地系统对稻田排水中氮素的去除效果

doi:10.3969/j.issn.1674-8530.2012.05.023

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Abstract The change in nitrogen concentration and distribution feature of carbontonitrogen ratio in the agricultural ditch and wetland system were analyzed based on the observed data in fields to investigate the nitrogen removal effect from drainage water in the system under a controlled irrigation and drainage condition. Results showed that TN，NH+4-N and NO-3-N concentrations in drainage were peaking after fertilization and then were significantly reduced after agricultural ditches were made to store water, causing 63.9% 67.8% and 83.2% nitrogen removal efficiencies in TN, NH+4-N and NO-3-N, respectively. The nitrogen concentration was reduced further after the drainage water was purified in wetlands, resulting in 47.7%, 44.3% and 82.0% average removal efficiencies for TN, NH+4-N and NO-3-N. Since the influence of organic matters on water quality is little under the controlled irrigation and drainage condition, a low carbontonitrogen ratio was maintained in general. The agricultural ditch and wetland system are effective in removing nitrogen in paddy field drainage water. However, the influence of low carbontonitrogen ratio on the Nitrogen removal efficiency is little under a controlled irrigation and drainage condition.

Key words： ecoditch and wetland controlled irrigation and drainage paddy field drainage nitrogen carbontonitrogen ratio

Received: 17 April 2012 Published: 30 September 2012

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	Articles by authors
	HE Yu-Pu
	PENG Shi-Zhang
	XU Jun-Zeng
	ZHANG Jian-Gang
	JIAO Jian
	YU Jia-Hong

Cite this article:

HE Yu-Pu,PENG Shi-Zhang,XU Jun-Zeng等. Removal effect of eco ditch and wetland system on nitrogen in paddy field drainage water[J]. Journal of Drainage and Irrigation Machinery Engin, 2012, 30(5): 609-613.

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http://zzs.ujs.edu.cn/pgjx/EN/10.3969/j.issn.1674-8530.2012.05.023 OR http://zzs.ujs.edu.cn/pgjx/EN/Y2012/V30/I5/609

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