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

查看全文 作　　者：Jihong [1,2]Zhang;Wenguang [1]Wu;Yuchen [3]Li;Yi [1]Liu;Xinmeng [1]Wang 高影响力作者 机构地区：[1]Shandong Provincial Key Laboratory of Fishery Resources and Ecological Environment,Yellow Sea Fisheries Research Institute,Chinese Academy of Fishery Sciences,Qingdao 266071,China;[2]Function Laboratory for Marine Fisheries Science and Food Production Processes,Pilot National Laboratory for Marine Science and Technology(Qingdao),Qingdao 266237,China;[3]The University of North Carolina at Chapel Hill,Chapel Hill 27514,NC,USA高影响力机构 出　　处：《Acta Oceanologica Sinica》索引2022年第41卷第6期,共8页高影响力期刊 基　　金：The National Key R&D Program of China under contract No.2020YFA0607603;the Strategic Priority Research Program of the Chinese Academy of Sciences under contract No.XDA23050402;the National Natural Science Foundation of China under contract Nos 41776155 and U1906216;the Marine S&T Fund of Shandong Province for Pilot National Laboratory for Marine Science and Technology(Qingdao)under contract No.2018SDKJ0501-3。 摘　　要：Eutrophication in coastal area has become more and more serious and mariculture potential is a main cause.Although there are some quantitative research on nutrient loads in national and global perspective,the calculation method problems make the results controversial.In this paper,the farming activities are divided into fed culture types(include cage culture and pond culture)and extractive culture types(e.g.seaweed,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 estimated.The 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 C.Overall,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 stoichiometry.Pond 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 different.Among 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 harvest.We suggest decrease the amount of fed culture types and increase the amount of integrated culture with extractive culture types.This 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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