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《海岸带表层沉积物中磷的地球化学特征-论文.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、中国环境科学2014,34(1):246-252ChinaEnvironmentalScience海岸带表层沉积物中磷的地球化学特征曲瑛璇,盛彦清,丁超锋,孙启耀(中国科学院烟台海岸带研究所,山东省海岸带环境工程技术研究中心,山东烟台264003)摘要:通过连续提取法对莱州湾主要入海河流及近岸海域表层沉积物中5种形态磷进行了定量分析黠果表明,近海沉积物自生钙结合磷含量(45.6%)高于河流(37.3%),而铁结合磷(Fe—P)含量(18.2%)却低于河流(31.3%).在近海,可交换或弱结合磷含量和粉砂比例呈正相关,表明该形态磷主要吸附于细粒粉砂.河流沉积物Fe—P与Fe浓度呈显著正相关(P<
2、O.O1),表明河流沉积物Fe—P分布受沉积物活性铁含量的控制.河口处Fe—P普遍低于相应河流,这可能与海相泥沙输入及河口厌氧区硫酸盐还原或硫化物累积有关.近海沉积物总可提取态磷平均浓度总体呈现出由海洋向河口方向递减的趋势.关键词:沉积物;磷形态;莱州湾;分布特征;磷的连续提取法中图分类号:X142文献标识码:A文章编号: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,也是导致水体富复杂.已有的研究表明,在渤海,通过沉积物一海营养化的主要元素l1J
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