共查询到20条相似文献,搜索用时 78 毫秒
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INTRODUCTIONAquiculturearearedtidesignalsoceanpollutionanddisaster.Althoughenvironmentscientistshaveconductedmanyin depthresearchesonthecauseandformationmechanismofredtide ,manyofitsaspectsarestillunknownbecauseredtideisacomplexphenomenonandtheecologic… 相似文献
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GEOCHEMICAL CHARACTERISTICS OF STABLE ISOTOPES FROM HYDROTHERMAL CHIMNEYS IN THE MARIANA TROUGH, WEST PACIFIC OCEAN 总被引:1,自引:0,他引:1
INTRODUCTIONResearchesonsea floorhydrothermalactivitiesandhydrothermalsulfidesyieldedthenewestknowledgeaboutmodernmarinegeologicalevolutionandmineralizationpatterns.Sincethe 1 980s,scientistshavebeenapplyingtheoxygenisotopemethodtorecoverthenotdirectlyde… 相似文献
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TRIPLOIDY INDUCTION WITH HEAT SHOCKS TO PENAEUS CHINENSIS AND THEIR EFFECTS ON GONAD DEVELOPMENT 总被引:3,自引:0,他引:3
INTRODUCTIONInrecentyears,scientistspaidincreasingattentiontopolyploidybreedingofaquaticanimals.Studiesontriploidybreedingoffishandmolluschavemadenoticeableprogress.Therearereportsoflargescalecommercialcultureoftriploidsinducedinsomespecies.Thereported… 相似文献
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A PRELIMINARY STUDY ON SUSPENDED SEDIMENT CONCENTRATION MEASUREMENTS USING AN ADCP MOUNTED ON A MOVING VESSEL 总被引:3,自引:0,他引:3
INTRODUCTIONSuspendedsedimenttransportplaysanimportantroleinthecoastalenvironmentevolution.Thus,theobservationofsuspendedsedimentsisofinteresttocoastalscientists,engineers,conservationistsandplanners,intheiractivitiesofharbourconstruction,landreclamatio… 相似文献
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林昱 《中国海洋湖沼学报》2000,(2)
INTRODUCTIONRedtidesoccurredinXiamenHarborin1986and1987.Thelocalmarinescientistscloselyobservedtheseredtidesandobtainedmuchusefuldata(Zhangetal.,1988;Du,1989;Zhuang,1991;Chengetal.,1993).Butsimultaneoustransientwatermovementalwaysmadeitdifficulttoinvestigatetheseredti… 相似文献
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INTRODUCTIONJohannes (1 965)firstshowedtheimportanceofprotozoaasremineralizersinmarineenvironments.Thesignificanceofprotozoainthefreshwaterfoodwebhasbeenknownforthepast2 0years.Protozoaisamainpredatorofplanktonicbacteriaandphytoplankton ,andalsoafoodsourceo… 相似文献
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DIMETHYLSULFIDE IN THE SOUTH CHINA SEA 总被引:1,自引:0,他引:1
INTRODUCTIONGreateffortsweredevotedrecentlytostudyingdimethylsulfide(DMS)distributioninseawater,asitaccountsforthemajorpartofthesulfurfluxfromtheoceanstotheatmosphere.Moreover,itsoxidationproductsintheatmospheremayinfluenceenvironmentalacidificationand… 相似文献
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1FRACTALTHEORYANDFLOODCALAMITIESThemostregulargeometricobjectswhichcouldbemeasuredbylengthsofspecificityaretheissueofclasica... 相似文献
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INTRODUCTIONTheSouthChinaSea (SCS)isauniquesemi encloseddeepoceanbasinlocatednearthewest ernperipheryofthePacificOcean .Spreadingfromtheequatorto 2 0°Nandspanningzonallyabout1 5°N ,theSCSliesbetweentheSouthChinacoastandthemaritimecontinent.TheSCSbottomtopogr… 相似文献
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ThewaterpollutionintheSecondSonghuaRiverhasbeenpaidmuchattentiontoforalongtime.Manyenvironmentalscientistshavedonealotofresearchworkonit,butmostofresearchcontentsweretofocusonheavymetalpollutionandorganicpollutioninwater,andlittleaboutnitrogen(Fuet… 相似文献
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NUMERICAL SIMULATION AND DYNAMIC STUDY OF THE WINTERTIME CIRCULATION OF THE BOHAI SEA 总被引:10,自引:2,他引:8
INTRODUCTIONTheBohaiSea,analmost closedshallowsea,liesnorthwesttotheYellowSea.Fig.1ashowsthege ometryoftheshorelineandthewaterdepthdistributionoftheBohaiSea,whichissmallandshallowcom paredwiththeYellowSeaortheEastChinaSea.Themeandepthislessthan 2 0meters.Be… 相似文献
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INTRODUCTIONTheSouthChinaSea(SCS)isapartly enclosedoceanbasinoverlaidbyapronouncedmonsoonsurfacewind .Paststudies (Chenetal.,1 991 ;DingandMurakami,1 994 ;Yan ,1 997;LiangBiqi,1 991 ;LiangJianyin ,1 991 )indicatethatahugewarmwaterpooljointlycontributedbythewesternPacific ,ea… 相似文献
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宁越敏 《中国地理科学(英文版)》1995,(3)
THERECENTECONOMICDEVELOPMENTOFCHINA'S'MILLION'CITIESNingYuemin(宁越敏)(TheInstituteofWestEuropeanandNorthAmericanGeography,EastC... 相似文献
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EFFECTS OF HARVEST STAGE ON THE TOTAL LIPID AND FATTY ACID COMPOSITION OF FOUR CYLINDROTHECA STRAINS
INTRODUCTIONPeopleshowedgreatinterestsinmicroalgaeduetotheirgoodcharacteristics,suchashigheffi ciencyofusingsolarenergy,smallsize ,nutritionalvalue ,rapidgrowthandmultiplicationrate .Mi croalgaehaveanimportantroleinmaricultureasfoodforlarvalstagesofcrusta… 相似文献
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INTRODUCTIONThelargeyellowcroakerPseudosciaenacroceaoncewasoneofthefourimportantmarinefish eryobjectsinChina (Hongetal.,1 983;HuangandCarl,1 983;ChenandGong ,1 983) .TheproductionofthewildP .croceain 1 974reached 1 971 78metrictons (MT)inChina (Li,1 998) .Becauseofoverfishing ,th… 相似文献
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INTRODUCTIONBillard ( 1 986)studiedthespermatozoonultrastructuresinteleostsandfounddistinctdifferencesa mongdifferentspecies.Studyonspermatozoonmorphologyandfunctionisachallengebecauseofthesperm’sspecialenvironment (Gageetal.,1 998;WangandZhang,1 999) .Sinceleft ey… 相似文献
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黄海军 《中国海洋湖沼学报》1999,17(1):41-48
INTRODUCTIONTheeffectsofhumanactivitiesonshorelineprocesseshavebeenconsiderable,particularlyoverthelastcentury.Themostsignificanteffectsarethosefromharbourconstructionandrivermouthtrainingwall.Inmanyinstances,majorinterruptionoflittoraldriftresultedfro… 相似文献
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Bai Zhang 《中国地理科学(英文版)》1994,4(4):322-332
(张柏)THESTRUCTUREANDDYNAMICSOFTHELANDRESOURCESSYSTEMINTHEFARMLANDSHELTERFORESTREGIONINTHENORTHEASTPLAIN¥ZhangBai(ChangchunInst... 相似文献
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INTRODUCTIONItisrecognizedthattherearetwoimportantprocessesthataffectthematerialfluxesintheEastChinaSea(ECS):oneisthematerialtransportprocessesrelatedtothefinematerial(modern)sedimentatthecenteroftheECSColdEddy,andtheotheristhesuspendedmatter(SM)fluxfrom… 相似文献
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1 ADVANCINGOFTHEQUESTIONANDCONSTRUCTIONBACKGROUNDOFSUZHOUINDUSTRYGARDENPerroxgavespecialattentiontotheeffectofimportantitemsandconstructionofinfrastructurewhenhediscussedtheproductionofgrowthpole(Li,1988).Lotsofdomesticscholarshavealsoprobedintothi… 相似文献