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Nitrogen Transport/Deposition from Paddy Ecosystem and Potential Pollution Risk Period in Southwest China

文献类型： 外文期刊

作者： Guo, Shufang 1 ; Yan, Tiezhu 1 ; Zhai, Limei 1 ; Yen, Haw 3 ; Liu, Jian 4 ; Li, Wenchao 1 ; Liu, Hongbin 1 ;

作者机构： 1.Chinese Acad Agr Sci, Key Lab Nonpoint Source Pollut Control, Minist Agr & Rural Affairs, Inst Agr Resources & Reg Planning, Beijing 100081, Peoples R China

2.Yunnan Acad Agr Sci, Inst Agr Environm & Resources, Kunming 650201, Yunnan, Peoples R China

3.Texas A&M Univ, Texas A&M Agrilife Res, Blackland Res & Extens Ctr, Temple, TX 76502 USA

4.Univ Saskatchewan, Global Inst Water Secur, Sch Environm & Sustainabil, Saskatoon, SK S7N 0X4, Canada

关键词： nonpoint source pollution; critical period; nitrogen deposition; NH3 emissions; surface runoff; paddy field

期刊名称：WATER （ 影响因子：3.53； 五年影响因子：3.628 ）

ISSN：

年卷期： 2022 年 14 卷 4 期

页码：

收录情况： SCI

摘要： Nitrogen (N) losses through runoff from cropland and atmospheric deposition contributed by agricultural NH3 volatilization are important contributors to lake eutrophication and receive wide attention. Studies on the N runoff and atmospheric N deposition from the paddy ecosystem and how the agriculture-derived N deposition was related to NH3 volatilization were conducted in the paddy ecosystem in the Erhai Lake Watershed in southwest China. The critical period (CP) with a relatively high total N (TN) and NH4+-N deposition occurred in the fertilization period and continued one week after the completion of fertilizer application, and the CP period for N loss through surface runoff was one week longer than that for deposition. Especially, the mean depositions of NH4+-N in the CP period were substantially higher than those in the subsequent period (p < 0.01). Moreover, agriculture-derived NH4+ contributed more than 54% of the total NH4+-N deposition in the CP period, being positively related to NH3 volatilization from cropland soil (p < 0.05). The N concentrations were higher in the outlet water of ditches and runoff in May than in other months due to fertilization and irrigation. Therefore, to reduce the agricultural N losses and improve lake water quality, it is important to both reduce agricultural NH4+-N deposition from NH3 volatilization and intercept water flow from the paddy fields into drainage ditches during the CP.

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