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1、中國(guó)環(huán)境科學(xué)2014,34(1):246-252ChinaEnvironmentalScience海岸帶表層沉積物中磷的地球化學(xué)特征曲瑛璇,盛彥清,丁超鋒,孫啟耀(中國(guó)科學(xué)院煙臺(tái)海岸帶研究所,山東省海岸帶環(huán)境工程技術(shù)研究中心,山東煙臺(tái)264003)摘要:通過連續(xù)提取法對(duì)萊州灣主要入海河流及近岸海域表層沉積物中5種形態(tài)磷進(jìn)行了定量分析黠果表明,近海沉積物自生鈣結(jié)合磷含量(45.6%)高于河流(37.3%),而鐵結(jié)合磷(Fe—P)含量(18.2%)卻低于河流(31.3%).在近海,可交換或弱結(jié)合磷含量和粉砂比例呈正相關(guān),表明該形態(tài)磷主要吸附于細(xì)粒粉砂.河流沉積物Fe—P與Fe濃度呈顯著正相關(guān)(P<
2、O.O1),表明河流沉積物Fe—P分布受沉積物活性鐵含量的控制.河口處Fe—P普遍低于相應(yīng)河流,這可能與海相泥沙輸入及河口厭氧區(qū)硫酸鹽還原或硫化物累積有關(guān).近海沉積物總可提取態(tài)磷平均濃度總體呈現(xiàn)出由海洋向河口方向遞減的趨勢(shì).關(guān)鍵詞:沉積物;磷形態(tài);萊州灣;分布特征;磷的連續(xù)提取法中圖分類號(hào):X142文獻(xiàn)標(biāo)識(shí)碼:A文章編號(hào):1000—6923(2014)01—0246—07Gochemistrycharacteristicofphosphorusincostalsurfacesediments.QUYing-xuan,SHENGYan-qing。,DINGChao-feng,SUNQi-yao(
3、ResearchCenterforCoastalEnvironmentEngineeringTechnologyofShandongProvince,YantaiInstituteofCoastalZoneResearch,ChineseAcademyofSciences,Yantai264003,China).ChinaEnvironmentalScience,2014,34(1):246-252Abstract:FivefractionsofphosphorusinmarineandfluvialsurfacesedimentsofLaizhouBaywereinvestigatedbya
4、sequentialextractionmethod.Theresultsindicatedthattheauthigeniccalcium-boundphosphorus(ACa-P)inmarinesediments(average45.6"/o)washigherthanthat(average37.3"/o)influvialsediments,butiron-boundphosphorus(Fe-P)inmarinesediments(average18-2%)Waslowerthanthatinfluvialsediments(average31-3%).Incoastalzone
5、,apos~iveco=elmionWasfoundbetweenexchangeableandlooselysorbedphosphorus(E&L-P)andsilt(grainsize),indicatingthatE&L-PWasmainlysorbedontofineparticles.AsignificantcorrelationfP<0.01)WasobservedbetweenFe-PandFeconcentrationsinfluvialsediments,whichindicatesthedistributionofFe-PinfluvialsedimentsWasdete
6、rminedbyFeconcentration.TheFe-PconcentrationinestuarysedimemsWaslowerthanthatincorrespondingriversediments.Thismaybeattributedtotheinputofmarinesedimentsandthereductionofsulfateortheaccumulationofsulfideunderanaerobicsection(Fefixedbysulfide).Themeanvaluesoftotalextractedphosphorusinsedimentspresent
7、sadecreasetrendfromofshoretoestuaries.Keywords:sediment;phosphorusforms;LaizhouBay;distributioncharacteristic;sequentialextractionmethodofphosphorus磷是重要的生源要素之一,也是導(dǎo)致水體富復(fù)雜.已有的研究表明,在渤海,通過沉積物一海營(yíng)養(yǎng)化的主要元素l1J