营养盐在胶州湾沉积物——海水界面上的交换速率和通量分析

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1、．重璺望堂查兰堡主堡皇h—●-——__——_——-___—_-———_，——__——-’_—___——___——、●__—_-__—_●_’—_-_—～—_-———-^——————————⋯AbstractAfunctionmethodofcalculatingthenutrientsexchangeratesatthesediment—waterinterfacewithdependenceofexchangeamountontimewasdevelopedbyconsideringtheinfluenceofincub

2、ationtimeandsamplingintervalsIntactsedimentcoresweresampledat16locationsinJiaozhouBayinJuly200IWiththelaboratoryincubationexperiments，benthicexchangeratesofSi03一Si，P04一P’NH4一N，N02一NandN01．Natthesediment—waterinterfaceweremeasuredAtthesametime，therelationshipsweres

3、tudiedbetweenthenutrientsexchangeratesandsedimentwatercontents，thenutrientsconcentrationsinporewategclaycontentsandgrainsizesTheexchangefluxesofdifferentnutrientsatthesediment—waterinterfacewereestimatedbyconsideringtheweightedpercentageofdifferentpatternsofsedime

4、nt．Themainexperimentalresultsareasfollows：1TheexchangeratesofSiOs—Si，P04-P，NH4-N，NOz-NandNOs-Natthesediment—waterinterfaceofJiaozhouBayTheSi03一SieffluxeswereobservedatallstationsandtheexchangeratesweregenerallyrangedfromO8to5lmmol‘m-2．d～．WhiletheeffluxesP04一P’NH4一

5、N，N02一NandN03一Nwereobservedatmostofstationsandtheirexchangeratesrangedfrom438tO395utool·m-2．d—forP04一P'from一0．5to16mmol-m-2．d～forNI-h-N，from一0052toO67mmol·m-2,d～forN02．Nandfrom一2to28mmol·m-2．d～forN03．Nrespectively2Therelationshipsbetweenthenutrientsexchangeratesat

6、thesediment—waterinterfaceinJiaozhouBayandsedimentwatercontents，thenutrientsconcentrationsinporewater,claycontentsandgrainsizeofsediments(1)ItwasshownthattheexchangeFatesofSi03一Siarepositivelyrelatedtothewaterandclaycontentsofthesediments．andtheSi03-Siconcentratio

7、nsinporewater．Furthermore，theexchangerateismainlydependentonthemeandiametersofthesedimentsastheWaterandclaycontentsofthesedimentswerealsodependentontheirdiametersTheexchangeprocessofSiOj—Siatthesediment—waterinterfacewasmainlydominatedbydissolutionofclayanddiffusi

8、onofSiOs·Sifromtheporewatertoseawater．However,thehighercontentoforganicmatterandbioturbationinthesedimentscanpromotetheexchangerategreatlg(2)Theexchange