期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 762, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2020.144168
关键词
Hot spots; Hot moments; Nitrogen removal; Hyporheic zone; Riparian zone
资金
- National Natural Science Foundation of China [41702241]
- Visiting Scholar Project of Tongji University in 2020
This paper reviews the pathways of nitrogen removal from hyporheic and riparian zones, with an emphasis on hot spots and hot moments, and outlines some research needs in this field.
The Earth is experiencing excessive nitrogen (N) input to its various ecosystems due to human activities. How to effectively and efficiently remove N from ecosystems has been, is and will be at the center of attention in N research. Hyporheic and riparian zones are widely acknowledged for their buffering capacity to reduce contaminants (especially N) transport downstream. However, these zones are usually misunderstood that they can remove N at all spots and at any moments. Here pathways of N removal from hyporheic and riparian zones are reviewed and summarized with an emphasize on their hot spots and hot moments. N is biogeochemically removed by denitrification, anammox, nitrifier denitrification, denitrifying anaerobic methane oxidation, Feammox and Sulfammox. Hot moments of N removal are mainly triggered by precipitation, fire and snowmelt. Finally, some research needs are outlined and discussed, such as developing approaches for multiscale sampling and monitoring, quantifying the effects of hot spots and hot moments at hyporheic and riparian zones and evaluating the impacts of human activities on hot spots and hot moments, to inspire more research on hot spots and hot moments of N removal. By this review, we hope to bring awareness of the heterogeneity of hyporheic and riparian zones to catchment managers and policy makers when tackling N pollution problems. (C) 2020 Elsevier B.V. All rights reserved.
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