Sources, fate and influencing factors of nitrate in farmland drainage ditches of the irrigation area
文献类型： 外文期刊
作者： Zhang, Tianpeng 1 ; Xu, Qiyu 1 ; Liu, Xiaotong 2 ; Lei, Qiuliang 1 ; Luo, Jiafa 3 ; An, Miaoying 1 ; Du, Xinzhong 1 ; Qiu, Weiwen 4 ; Zhang, Xuejun 2 ; Wang, Fengzhi 5 ; Liu, Hongbin 1 ;
作者机构： 1.Chinese Acad Agr Sci, Inst Agr Resources & Reg Planning, Minist Agr & Rural Affairs, Key Lab Nonpoint Source Pollut Control,State Key L, Beijing 100081, Peoples R China
2.Ningxia Acad Agr & Forestry Sci, Inst Agr Resources & Environm, Yinchuan 750002, Peoples R China
3.AgRes Ruakura, Hamilton 3240, New Zealand
4.New Zealand Inst Plant & Food Res Ltd, Private Bag 3230, Hamilton 3240, New Zealand
5.North Minzu Univ, Anal & Testing Ctr Ningxia, Yinchuan 750021, Peoples R China
关键词： Nitrate tracing; Nitrogen and oxygen isotopes; Seasons; Irrigated areas
期刊名称：JOURNAL OF ENVIRONMENTAL MANAGEMENT （ 影响因子：8.0； 五年影响因子：7.9 ）
ISSN： 0301-4797
年卷期： 2024 年 367 卷
页码：
收录情况： SCI
摘要： Global irrigation areas face the contradictory challenges of controlling nitrate inputs and ensuring food-safe production. To prevent and control nitrate pollution in irrigation areas, the study using the Yellow River basin (Ningxia section) of China as a case study, employed nitrogen and oxygen dual isotope tracing and extensive field investigations to analyze the sources, fate, and influencing factors of nitrate in agricultural drainage ditches. The results of source tracing of nitrate showed that annual proportions of nitrate sources entering the Yellow River in the ditches are as follows: for manure & sewage, fertilizer, and natural sources, the ratios are 33%, 35%, and 32% overall. The results of nitrate fate showed that nitrates derived from nitrate fertilizer exhibit a lower residual rate in drainage ditches (ecological ditches) compared to ammonium fertilizer, which can undergo self-ecological restoration within one year. The results of influencing factors showed that crops with high water and nutrient requirements, such as vegetables, the nitrate pollution and environmental harm resulting from "exploitative cultivation" are five times more than normal cultivation practices in dryland and paddy fields, especially winter irrigation without crop interception exacerbates the leaching of nitrate from the soil. Therefore, nitrate management in irrigation areas should focus on preventing and controlling "exploitative cultivation" and losses during winter irrigation, while appropriately adjusting the application ratio of ammonium nitrogen fertilizers. The results of the study can guide strategies to mitigate nitrate pollution in irrigated areas such as livestock farming, fertilizer application, irrigation management, ditch optimization, and crop cultivation.
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