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

WATER RESEARCH

卷:142

Article

Liu, Xiaochen¹  Beusen, Arthur H. W.^1,2  Van Beek, Ludovicus P. H.³  Mogollon, Jose M.^1,4  Ran, Xiangbin^1,5  Bouwman, Alexander F.^1,2 

[1] Univ Utrecht, Dept Earth Sci, Fac Geosci, POB 80021, NL-3508 TA Utrecht, Netherlands

[2] PBL Netherlands Environm Assessment Agcy, POB 30314, NL-2500 GH The Hague, Netherlands

[3] Univ Utrecht, Dept Phys Geog, Fac Geosci, POB 80-115, NL-3508 TC Utrecht, Netherlands

[4] Leiden Univ, Inst Environm Sci CML, POB 9518, NL-2300 RA Leiden, Netherlands

[5] State Ocean Adm, Res Ctr Marine Ecol, Inst Oceanog 1, Qingdao 266061, Peoples R China

关键词: Nutrient delivery;    Mechanism model;    Nutrient export;    Nutrient retention;    The Yangtze River;    Source attribution;   

DOI  :  10.1016/j.watres.2018.06.006

来源: Elsevier

【 摘 要 】

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. (C) 2018 The Authors. Published by Elsevier Ltd.

【 授权许可】

Free