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What drives the change of nitrogen and phosphorus loads in the Yellow River Basin during 2006-2017?

Journal of Environmental Sciences 2023年第4期126卷 17-28页

作者： Jiaqi Zheng Xianghui Cao Chunzi Ma Nanyan Weng Shouliang Huo State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental ScienceBeijing 100012China

The Yellow River Basin (YRB) plays a very important role in China’s economic and social development and ecological *** particular,the ecosystem of the YRB is sensitive to climate ***,the change of nutrient fluxes in this region during the past years and its main driving forces remain *** this study,a hydrologic model R System for Spatially Referenced Regressions on Watershed Attributes (RSPARROW) was employed to simulate the spatio-temporal variations in the fluxes of total nitrogen (TN) and total phosphorus (TP) during the period of *** results suggested that the TN and TP loads increased by 138%and 38%during 2006-2014,respectively,and decreased by 66%and 71%from 2015 to 2017,*** the period of 2006-2017,the annual mean fluxes of TN and TP in the YRB were in the range of 3.9 to 591.6 kg/km^(2)/year and 1.7 to 12.0 kg/km^(2)/year,*** flux was low in the upstream area of the Yellow River,and presented a high level in the middle and lower ***,the flux of TP in Gansu and Ningxia section was slightly higher than that in the lower reaches of the Yellow *** and point source are the key drivers for the inter-annual changes of TN loads in most regions of the *** the inter-annual variations of TP loads in the whole basin are mainly driven by the point *** study demonstrates the important impacts of climate change on nutrient loads in the ***,management measures should be taken to reduce pollution sources and thus provide solid basis for control of nitrogen and phosphorus in the YRB.

关键词： Yellow river basin nutrient loads Climate change Non-point source Point source

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Environmental effects of mariculture in China:An overall study of nitrogen and phosphorus loads

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Acta Oceanologica Sinica 2022年第6期41卷 4-11页

作者： Jihong Zhang Wenguang Wu Yuchen Li Yi Liu Xinmeng Wang Shandong Provincial Key Laboratory of Fishery Resources and Ecological Environment Yellow Sea Fisheries Research InstituteChinese Academy of Fishery SciencesQingdao 266071China Function Laboratory for Marine Fisheries Science and Food Production Processes Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China The University of North Carolina at Chapel Hill Chapel Hill 27514NCUSA

Eutrophication in coastal area has become more and more serious and mariculture potential is a main *** there are some quantitative research on nutrient loads in national and global perspective,the calculation method problems make the results *** this paper,the farming activities are divided into fed culture types(include cage culture and pond culture)and extractive culture types(***,filter-feeding shellfish culture).Based on the annual yield of China in 2019 and feed coefficient of fed culture types and carbon(C),nitrogen(N),and phosphorus(P)content of extractive culture types,the annual nutrient loads was *** results showed that to coastal region of China(1)annual nutrient released by fed culture types were about58451 t of N,9081 t of P,and annual nutrient removed by harvest of extractive culture types were 109245 t of N,11980 t of P and 1.86×10^(6)t of ***,the net amount of nutrient removed annually by mariculture industry were 50794 t of N and 2901 t of P.(2)The nutrient released from mariculture industry influenced nutrient *** farming and seaweed farming had the potential of increasing the molar concentration ratio of N and P(N:P),while cage farming and bivalve farming decreased the N:P.(3)Due to different mariculture types and layouts in the coastal regions in China,N and P loading were regional *** the coastal regions in China,net release of nutrient from mariculture occurred only in Hainan and Guangxi regions,while in the other regions,N and P were completely removed by *** suggest decrease the amount of fed culture types and increase the amount of integrated culture with extractive culture *** study will help to adjust mariculture structure and layout at the national level to reduce the environmental impact.

关键词： fed culture type extractive culture type nutrient loads nitrogen phosphorus

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