Net Anthropogenic Nitrogen Input and Its Relationship with Riverine Nitrogen Flux in a Typical Irrigated Area of China Based on an Improved NANI Budgeting Model
文献类型: 外文期刊
第一作者: Yan, Tiezhu
作者: Yan, Tiezhu;Yan, Tiezhu;Lei, Qiuliang;Du, Xinzhong;Zhai, Limei;Liu, Hongbin;Bai, Jianwen;Bao, Han
作者机构:
关键词: nitrogen; Ulansuhai Nur watershed; human activities; NANI; irrigated watershed
期刊名称:WATER ( 影响因子:3.4; 五年影响因子:3.5 )
ISSN:
年卷期: 2023 年 15 卷 2 期
页码:
收录情况: SCI
摘要: Excessive nitrogen (N) inputs from human activities in the watershed have resulted in water quality deterioration and other biological hazards. It is therefore critical to fully understand the anthropogenic N inputs and their potential impacts on regional water quality. In this study, a modified net anthropogenic nitrogen input (NANI) budgeting model considering the irrigation N input was developed and applied to investigate spatial-temporal variations of anthropogenic N inputs and their relationship with riverine N flux from 2005 to 2019 in a semi-arid irrigated watershed, Ulansuhai Nur watershed (UNW), China. The results showed that the annual average anthropogenic N inputs reached 14,048.0 kg N km(-2) yr(-1) without a significant temporal change trend. Chemical N fertilizer was the major contributor for watershed NANI and accounted for 75.3% of total NANI. Hotspots for N inputs were located in the central part of the watershed. In this study, watershed NANI does not have a significant regression relationship with riverine N export during the study period. Riverine N export showed an obvious decreased trend, which mainly was attributed to human activities. In addition, approximately 1.92% of NANI was delivered into the water body. Additionally, the N inputs into the watershed by the irrigation water accounted for 9.9% of total NANI. This study not only expands the application range of the NANI model in irrigated watersheds, but also provides useful information for watershed N management strategies.
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