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- Title
Anthropogenic point and non-point nitrogen inputs into Huai River Basin and their impacts on riverine ammonia-nitrogen flux.
- Authors
Zhang, W. S.; Swaney, D. P.; Li, Y. X.; Hong, B.; Howarth, R. W.; Ding, S. H.
- Abstract
This study provides a new approach to estimate both anthropogenic non-point and point nitrogen (N) inputs to the landscape, and determines their impacts on riverine ammonia-nitrogen (AN) flux, providing a foundation for further exploration of anthropogenic effects on N pollution. Our study site is Huai River Basin of China, a watershed with one of the highest levels of N input in the world. Multi-year average (2003-2010) inputs of N to the watershed are 27 200 ± 1100 kgNkm-2 yr-1. Non-point sources comprised about 98% of total N input and only 2% of inputs are directly added to the aquatic ecosystem as point sources. Fertilizer application was the largest non-point source of new N to the Huai River Basin (69% of net anthropogenic N inputs), followed by atmospheric deposition (20%), N fixation in croplands (7%), and N content of imported food and feed (2%). High N inputs showed impacts on riverine AN flux: fertilizer application, point N input and atmospheric N deposition were proved as more direct sources to riverine AN flux. Modes of N delivery and losses associated with biological denitrification in rivers, water consumption, interception by dams influenced the extent of export of riverine AN flux from N sources. Our findings highlight the importance of anthropogenic N inputs from point and non-point sources in heavily polluted watersheds, and provide some implications for AN prediction and management.
- Subjects
HUAI River (China); NITROGEN; POINT sources (Pollution); RIVER pollution; AMMONIA; LANDSCAPES; AQUATIC ecology
- Publication
Biogeosciences Discussions, 2015, Vol 12, Issue 4, p3577
- ISSN
1810-6277
- Publication type
Article
- DOI
10.5194/bgd-12-3577-2015