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- Title
Human activities aggravate nitrogen-deposition pollution to inland water over China.
- Authors
Gao, Yang; Zhou, Feng; Ciais, Philippe; Miao, Chiyuan; Yang, Tao; Jia, Yanlong; Zhou, Xudong; Klaus, Butterbach-Bahl; Yang, Tiantian; Yu, Guirui
- Abstract
In the past three decades, China has built more than 87 000 dams with a storage capacity of ≈6560 km3 and the total surface area of inland water has increased by 6672 km2. Leaching of N from fertilized soils to rivers is the main source of N pollution in China, but the exposure of a growing inland water area to direct atmospheric N deposition and N leaching caused by N deposition on the terrestrial ecosystem, together with increased N deposition and decreased N flow, also tends to raise N concentrations in most inland waters. The contribution of this previously ignored source of N deposition to freshwaters is estimated in this study, as well as mitigation strategies. The results show that the annual amounts of N depositions ranged from 4.9 to 16.6 kg · ha−1 · yr−1 in the 1990s to exceeding 20 kg · ha−1 · yr−1 in the 2010s over most of regions in China, so the total mass of ΔN (the net contribution of N deposition to the increase in N concentration) for lakes, rivers and reservoirs change from 122.26 Gg N · yr−1 in the 1990s to 237.75 Gg N · yr−1 in the 2010s. It is suggested that reducing the N deposition from various sources, shortening the water-retention time in dams and decreasing the degree of regulation for rivers are three main measures for preventing a continuous increase in the N-deposition pollution to inland water in China.
- Subjects
CHINA; WATER pollution; REGULATION of rivers; ATMOSPHERIC deposition; SURFACE area; DAMS
- Publication
National Science Review, 2020, Vol 7, Issue 2, p430
- ISSN
2095-5138
- Publication type
Article
- DOI
10.1093/nsr/nwz073