Статья

Exploring spatiotemporal changes of the Yangtze River (Changjiang) nitrogen and phosphorus sources, retention and export to the East China Sea and Yellow Sea

Xiaochen LiuDepartment of Earth Sciences, Faculty of Geosciences, Utrecht University, P.O. Box 80021, 3508 TA Utrecht, The Netherlands. Electronic address: [email protected]Arthur BeusenDepartment of Earth Sciences, Faculty of Geosciences, Utrecht University, P.O. Box 80021, 3508 TA Utrecht, The Netherlands; PBL Netherlands Environmental Assessment Agency, P.O. Box 30314, 2500 GH The Hague, The NetherlandsLudovicus P.H. Van BeekDepartment of Physical Geography, Faculty of Geosciences, Utrecht University, P.O. Box 80.115, 3508TC Utrecht, The NetherlandsJosé M. MogollónDepartment of Earth Sciences, Faculty of Geosciences, Utrecht University, P.O. Box 80021, 3508 TA Utrecht, The Netherlands; Institute of Environmental Sciences (CML), Leiden University, P.O. Box 9518, 2300 RA Leiden, The NetherlandsXiangbin RanDepartment of Earth Sciences, Faculty of Geosciences, Utrecht University, P.O. Box 80021, 3508 TA Utrecht, The Netherlands; Research Center for Marine Ecology, First Institute of Oceanography, State Oceanic Administration, 266061 Qingdao, PR ChinaLex BouwmanDepartment of Earth Sciences, Faculty of Geosciences, Utrecht University, P.O. Box 80021, 3508 TA Utrecht, The Netherlands; PBL Netherlands Environmental Assessment Agency, P.O. Box 30314, 2500 GH The Hague, The Netherlands

2018en

ABI

Аннотация

Nitrogen (N) and phosphorus (P) flows from land to sea in the Yangtze River basin were simulated for the period 1900–2010, by combining models for hydrology, nutrient input to surface water, and an in-stream retention. This study reveals that the basin-wide nutrient budget, delivery to surface water, and in-stream retention increased during this period. Since 2004, the Three Gorges Reservoir has contributed 5% and 7% of N and P basin-wide retention, respectively. With the dramatic rise in nutrient delivery, even this additional retention was insufficient to prevent an increase of riverine export from 337 Gg N yr−1 and 58 Gg P yr−1 (N:P molar ratio = 13) to 5896 Gg N yr−1 and 381 Gg P yr−1 (N:P molar ratio = 35) to the East China Sea and Yellow Sea (ECSYS). The midstream and upstream subbasins dominate the N and P exports to the ECSYS, respectively, due to various human activities along the river. Our spatially explicit nutrient source allocation can aid in the strategic targeting of nutrient reduction policies. We posit that these should focus on improving the agricultural fertilizer and manure use efficiency in the upstream and midstream and better urban wastewater management in the downstream subbasin.

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Идентификаторы

DOI: 10.1016/j.watres.2018.06.006

Цитирования и источники

Цитирований: 2Использованных источников: 0

Показатели — AkademScholar