

FOLLOWUS
1.Frontiers Science Center for Deep Ocean Multispheres and Earth System, and Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao266100, China
2.Laboratory for Marine Ecology and Environmental Science, Qingdao266071, China
3.College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao266100, China
4.Department of Earth Sciences, Faculty of Geosciences, Utrecht University, Utrecht3584 CB, The Netherlands
5.PBL Netherlands Environmental Assessment Agency, Hague30314, The Netherlands
6.Tianjin Marine Environmental Monitoring Central Station, State Oceanic Administration, Tianjin300457, China
7.Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao266071, China
qzhyao@ouc.edu.cn
Received:03 November 2023,
Published:01 November 2024
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YANG Fuxia,YU Zhigang,BOUWMAN Alexander Felix,et al.Research PaperSignificant impacts of artificial regulation on nutrient concentrations and transport in Huanghe River[J].Journal of Oceanology and Limnology,2024,42(06):1865-1879.
YANG Fuxia,YU Zhigang,BOUWMAN Alexander Felix,et al.Research PaperSignificant impacts of artificial regulation on nutrient concentrations and transport in Huanghe River[J].Journal of Oceanology and Limnology,2024,42(06):1865-1879. DOI: 10.1007/s00343-024-3234-6.
Human perturbations such as dam regulation have led to significant changes in nutrient flux
structure
and spatiotemporal distribution through rivers and have greatly influenced coastal and estuarine ecological environments. Based on the data from 2001–2019
the impacts of the water-sediment regulation scheme (WSRS) in the Huanghe (Yellow) River on nutrient concentrations
forms
fluxes
and potential ecological effects on the Huanghe River estuary and Bohai Sea were analyzed. Nutrient concentrations and forms were significantly influenced by the different regulatory modes and were associated with hydrological and biogeochemical processes. The concentrations and forms of nutrients were strongly influenced by the riparian floodplains and scouring process of the downstream riverbed at the water draining stage
while they were influenced mainly by the mixing process in the Xiaolangdi Reservoir at the sediment desilting stage. Compared with those in non-WSRS years
the seasonal distributions of water discharge and nutrient fluxes in WSRS years significantly changed
with peaks occurring at least one month earlier than those in non-WSRS years. Nitrate (NO
3
-N)
phosphate (PO
4
-P)
and silicate (SiO
3
-Si) fluxes during the WSRS
which were strongly controlled by water discharge at Lijin (the nearest hydrological station to the river mouth)
accounted for more than 20% of the annual fluxes; these fluxes were more than 5–9 times greater than those during the same period in non-WSRS years. WSRS exacerbated nutrient imbalances and increased Pyrrophyta/Bacillariophyta ratios by 231% in the Huanghe River estuary
resulting in chlorophyll-
a
peaks in the Bohai Sea shifting from spring to autumn in the 20
th
century to spring-summer in the 21
st
century.
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