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Human activities aggravate nitrogen-deposition pollution to inland water over China.

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.

SUBMITTER: Gao Y

PROVIDER: S-EPMC8288964 | biostudies-literature | 2020 Feb

REPOSITORIES: biostudies-literature

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Human activities aggravate nitrogen-deposition pollution to inland water over China.

Gao Yang Y Zhou Feng F Ciais Philippe P Miao Chiyuan C Yang Tao T Jia Yanlong Y Zhou Xudong X Klaus Butterbach-Bahl BB Yang Tiantian T Yu Guirui G

National science review 20190625 2

In the past three decades, China has built more than 87 000 dams with a storage capacity of ≈6560 km<sup>3</sup> and the total surface area of inland water has increased by 6672 km<sup>2</sup>. 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 t ...[more]

PMID: 34692058

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Human activities aggravate nitrogen-deposition pollution to inland water over China.

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Human activities aggravate nitrogen-deposition pollution to inland water over China.

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