Sedimentary records of eutrophication in the Changjiang Estuary upwelling area over last 100 a-中国Betway体育网页登陆

摘要 TheupwellingareaintheChangjiangEstuarywasselectedtocollectthecore,wheretheredtideoccurredfrequentlyandhypoxicexisted.Thetotalorganiccarbon(TOC),totalnitrogen(TN),biogenicsilica(BSi)andstableorganiccarbonisotopicratios(δ13Corg)weredeterminedonthe210Pb-datedsedimentcore.TheconcentrationsofTOC,TN,BSiaswellastheirsedimentationfluxeshaveincreasedtosomeextentsincethe1970s.TOCandTNfluxesincreasedabout45%,36%respectively.Theaverageδ13Corgvalueinthecorewas-23.67×10-3whichremainednearlyconstantbeforethe20century.Theδ13Corgvaluesincreasedafterthe1900s,twomarkedincreaseswereobservedfromthe1950sandthe1970s.Asimpleδ13Corgmodelwasusedtoestimatethecontributionofterrigenousandmarineorganicmatterinputsforthesediment,whichindicatedtheincreaseinaccumulationsincethe1970shasbeenalmostexclusivelymarine.Theincreasingofmarineorganicmatteraccumulation(TOC,TNandBSi)wascorrespondingwiththeincreasingoffertilizerconsumptionandtheNO3-NbudgetsfromtheChangjiangRiver.Theriverinerunoffoffertilizersandnutrientsstimulatedthealgaeblooming.Enhancedprimaryproductionresultedinanenrichmentoforganicmatterinthesediment.ThesedatasupportthehypothesisthatanthropogenicnutrientloadinghasbeenasignificantfactorontheeutrophicationintheChangjiangEstuary.

1高抒;程鹏;汪亚平;曹奇源.Characteristics of Suspended Sediment Concentrations over the Areas Adjacent to Changjiang River Estuary, the Summer of 1998.海洋科学,2000-01.
2LU Wenhai;XIANG Xianquan;YANG Lu;XU Yan;LI Xiao;LIU Shuming.The temporal-spatial distribution and changes of dissolved oxygen in the Changjiang Estuary and its adjacent waters for the last 50 a.海洋科学,2017-05.
3.CLIMATIC RECORDS FROM ANNUAL LAYERS AND STABLE ISOTOPES OF A STALAGMITE IN BEIJING OVER THE LAST 2300 YEARS.自然地理学,1997-03.
4ZHANG De'er.Severe Drought Events as Revealed in the Climate Records of China and Their Temperature Situations over the Last 1000 Years.大气科学及气象学,2005-04.
5GAO Jianhua;WANG Yaping;PAN Shaoming;ZHANG Rui;LI Jun;BAI Fenglong.Distribution of organic carbon in sediments and its influences on adjacent sea area in the turbidity maximum of Changjiang Estuary in China.海洋科学,2008-04.
6ZHANG Weiyan;JIN Haiyan;YAO Xuying;JI Zhongqiang;ZHANG Xiaoyu;YU Xiaoguo;ZHANG Fuyuan;GAO Aigen.Grain size composition and transport of sedimentary organic carbon in the Changjiang River （Yangtze River） Estuary and Hangzhou Bay and their adjacent waters.海洋科学,2015-10.
7Basanta PAUDEL;ZHANG Yili;LI Shicheng;LIU Linshan.Spatiotemporal changes in agricultural land cover in Nepal over the last 100 years.自然地理学,2018-10.
8王保栋;屠建波.Biogeochemistry of Nutrient Elements in the Changjiang （Yangtze River） Estuary.海洋科学,2005-02.
9Sivaji Patra;Congqiang LIU;Siliang LI;Fushun WANG;Baoli WANG.Water chemical behavior at Yangtze （Changjiang） River estuary.地球化学,2006-02.
10JiufaLI;XinningWAN;MingYING;XiaohuaCHEN.FIELD OBSERVATIONS ON BED SEDIMENTS AND SANDWAVES IN CHANGJIANG ESTUARY.地球物理学,2005-02.

Sedimentary records of eutrophication in the Changjiang Estuary upwelling area over last 100 a

来源期刊

相关推荐

同分类资源更多

相关关键词