简介：于2003年8月28日对奥运帆船赛场海域海水水质要素进行了现场调查，并以无机态氮（DIN）、无机态磷（PO4-P）、化学耗氧量（COD）、溶解氧（DO）为化学指标参数，探讨了该海域的富营养化状况。结果表明，奥运会帆船赛场海域除石油烃外，大部分海域符合国家一类海水水质标准，石油烃平均含量超过国家二类水质标准。该海域调查海区PO4-P、DIN主要受陆源排放影响，特别是浮山湾至石老人沿岸海域含量较高。部分区域已经开始呈现轻微富营养化状态，富营养化状况主要受陆源排放等因素的影响。整体上奥运会帆船赛场海域水质良好，污染较轻。

简介：InordertoexaminetheseasonalandspatialdistributionsofbenthicanimalsintheintertidalmudflatofthesouthernYellowRiverDelta,fieldinvestigationswerecarriedoutin2007and2008andmultiplemethodswereapplied.Resultsshowedthat,thebiomassofmacrobenthosrangedat0.75-1151.00gwetm-2andaveragedat156.31gwetm-2,inwhichMactraveneriformisaccountedfor75.6%-93.4%ofthetotalmacrobenthicbiomass.Morethan90%ofmacrobenthosinhabitedinthemiddleandlowtidelines,andhigherbiomassoccurredinearlysummerandlowerinwinter.Statisticalanalysisshowedthat:1)M.veneriformisgrowthwasprimarilyfavoredathighertemperatureandlowersalinity;2)afterlongtimeinteraction,benthicbivalvegrazersledtopatchingdistributionsofChlorophylla(Chla);3)macrobenthicbiomasspositivelyrelatedwithChlawhentheconcentrationofChlawaslow,buttheywerenegativelyrelatedwhenChlaconcentrationwashigh;and4)furthermore,thebiomassofbenthicbivalvespeakedinthesedimentwithmediangrainsizeabout0.55mm,butdecreasedgraduallyincoarseorfinesediments.Thesecondaryproductivityrangedat0.37?283.68gm-2yr-1andaveragedat47.88gm-2yr-1,inwhich69.7%wascontributedbyM.veneriformisItwasestimatedthatprimaryproductionwastransformedtosecondaryproductionatarateof6.87%approximately,whichimpliesthatthereisalocalsustainabilityofhighbivalveproduction.