Significant impacts of artificial regulation on nutrient concentrations and transport in Huanghe River  

作　　者：Fuxia YANG Zhigang YU Alexander Felix BOUWMAN Hongtao CHEN Mengfan WU Jing LIU Dandan LI Qingzhen YAO Yao GONG Xinyu LI Wenyan GU 

机构地区：[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,Qingdao 266100,China [2]Laboratory for Marine Ecology and Environmental Science,Qingdao 266071,China [3]College of Chemistry and Chemical Engineering,Ocean University of China,Qingdao 266100,China [4]Department of Earth Sciences,Faculty of Geosciences,Utrecht University,Utrecht 3584 CB,The Netherlands [5]PBL Netherlands Environmental Assessment Agency,Hague 30314,The Netherlands [6]Tianjin Marine Environmental Monitoring Central Station,State Oceanic Administration,Tianjin 300457,China [7]Yellow Sea Fisheries Research Institute,Chinese Academy of Fishery Sciences,Qingdao 266071,China

出　　处：《Journal of Oceanology and Limnology》2024年第6期1865-1879,共15页海洋湖沼学报（英文）

基　　金：Supported by the Joint Fund between NSFC and Shandong Province(No.U22A2058);the National Natural Science Foundation of China(Nos.41876116,42130410);the Natural Science Foundation of Shandong Province(No.ZR2019MD035)。

摘　　要：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.

关 键 词：water-sediment regulation scheme nutrient form nutrient flux ecological effect Huanghe(Yellow)River 

分 类 号：TV882.1[水利工程—水利水电工程] X143[环境科学与工程—环境科学] P342[天文地球—水文科学]