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1 Introduction18Oinmarineenvironmentplaysanimportantroleinoceanographicalstudy .Asastableisotopeofoxygen ,18OtogetherwithhydrogenatomsconstituteswatermoleculeH218OandmoveswithalargeamountofH2 Omoleculesinseawater.Sothatδ18Obecomesanidealtracerforthemovemento… 相似文献
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INTRODUCTIONOceantidesplayaveryimportantroleinthedynamicsoftheEarthandhaveattractedmanypeople’sattentionsinceancienttimes.Beforethelate 1 970s,tidesweremeasuredmainlybycoastalgauges .Directmeasurementsaswellasnumericalsimulations,canprovidefairlyaccurateu… 相似文献
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INTRODUCTIONInrecentyears,co culture (integratedculture )ofmarinespecies (algaeandanimals)hasreceivedgreatattention .Inco culturesystemthealgaeactivelyuptakeCO2 andthemetabolicwastes(suchasNH4 +,NO2 - ,NO3- etc)asnutrientsources,andreleaseO2 tothesurroundingenviron … 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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INTRODUCTIONAtpresentgiantfreshwaterprawn (Macrobrachiumrosenbergii) ,Chineseshrimp (Penaeuschinensis)andgianttigerprawn (P .monodon)arethemainshrimpsforcultureinChina.Asweknow ,feedstuffcostisamajorexpenseiteminculturepractice.Overfeedingwillnotonlywastefee… 相似文献
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STUDY ON THE ISOTHERMS OF THE INTERACTION BETWEEN SUSPENDED PARTICLES AND Cu (Ⅱ) IN THE HUANGHE RIVER 总被引:1,自引:0,他引:1
INTRODUCTIONThevariousphysicalandchemicalreactionsthatoccurbetweenthesuspendedparticles,sediments,etc.andheavymetalsinanaturalaquaticsystemplayextremelyimportantpartsincontrollingthedistributionpattern,migrationandtransformationofheavymetalsthere.Since… 相似文献
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A coupled interannual oscillation system 总被引:4,自引:0,他引:4
INTRODUCTIONElNi no SouthernOscillation (ENSO)istheinterannualinteractionofocean atmosphereinthetropical(especiallyequatorial)Pacific .Itisalsorecognizedasbeingthedominantmechanismoftheearth’sinterannualclimatechange.Severalconceptual (simple)modelswereprop… 相似文献
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INTRODUCTIONPhosphorusisakeynutritiveelementforthegrowthofmarinephytoplankton .Recently ,be causeofenvironmentalpollution ,theeutrophicationproblemsincoastalandoceanicwatershavebe comemoreandmoreserious.Theenvironmentecologicalresponseinthelong termtothef… 相似文献
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1 INTRODUCTIONItisveryimportanttorealizethedistributionsofpollutantsbeforethepollutioncanbecontrolledsuc cessfully .Owingtothelackofsystematicalobserva tionsinabroadarea ,numericalsimulationhasbe comeapowerfultooltounderstandthedistributionsofpollutantsa… 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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INTRODUCTIONTheproductionofphytoplanktonisthefirsttacheintheproductionbymarineorganismsandinthemarinefoodchain .Knowledgeofprimaryproductioninmarinewatersisprerequisiteforexploitationandmanagementoftheocean’slivingresources.Theprimaryproductioninmarin… 相似文献
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陈惠莲 《中国海洋湖沼学报》2001,(4)
INTRODUCTIONRaninoidesfoundbyH .MilneEdwards,1 83 7,nowincludessixspeciesinIndo PacificOceans:R .personatusHenderson ,1 888,R .seratifronsHenderson,1 888,R .hendersoniChopra,1 93 1 ,R .barnardiiSakai,1 974 ,R .crosnieriRibes,1 989andR .intermediusDaietXu,1 993 .RecentlyreportedR .perso… 相似文献
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1 INTRODUCTIONAsanimportantcomponentoftheglobalterres trialecosystems ,forestlinkstheatmosphere ,soilandwatertogetherthroughitspowerfulecologicalfunc tion .Inrecentyears,owingtotheglobalwarmingandhumaninfluence ,forestfireoccurmuchmorefrequently .Theannualf… 相似文献
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VARIATIONS IN ISOTOPIC COMPOSITIONS OF CHLORINE IN EVAPORATION-CONTROLLED SALT
LAKE BRINES OF QAIDAM BASIN,CHINA 总被引:2,自引:0,他引:2
INTRODUCTIONChlorinehastwonaturallyoccuringstableisotopes, 35Cland 37Cl.Severalstudiesreportedthevariationsintheisotopiccompositionofchlorineinnature.However,intheearlyyearsOwenandSchaeffer(1955)reportednoobservabledifferenceinthe 37Cl35Clratiosintensamplesex… 相似文献
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1 IntroductionArcticclimateandenvironmentareveryimportantintheglobalchangesystems(WMO/UNEP 1 990 ;WMO 1 991 ) .Observationsandmodelingresultsindicatethattheglobalwarmingwillbeenhancedinthepolarregions ,especiallyintheNorthHemi sphere ,withapredictedwarmingofabout… 相似文献
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INTRODUCTIONBiogenicsulfideproducedbybacterialsulfatereductionisoneofthemostimportantindicatorsinanoxicmarineenvironments,particularlyinconfiningbays,pollutedestuariesandaquaculturear eas.Theincreaseofitsconcentrationusuallyindicatesworsenedconditions.… 相似文献
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INTRODUCTIONPollutionofmarineecosystemposesaseriousthreattomarineorganismsandultimatelytheentireecosystem.Inrecentyears,organophosphorous(OP)pesticideshavelargelyreplacedorganochlorinepesticidesbecauseoftheirrapidbreakdowninwaterandtheirlowenvironmenta… 相似文献
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INTRODUCTIONTheBohaiSeawaschosenasthesiteofthefirstphaseoftheChina GLOBEC (GlobalOceanEcosystemDynamics)programfrom 1 997to2 0 0 0 ,inwhichthedynamicsofzooplanktonpopulationswasoneofthefourprincipalfoci.Smallcopepodscompriseanimportantcomponentofzooplanktonesp… 相似文献
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INTRODUCTIONTraditionally,thecontinentalshelfcirculationisjudgedonthebasisofthewatersalinityandtemperaturedistribution,massanalysisandobservedcurrentvelocitybykinemometer.Limitedobservationaldatamakesitdifficulttodemonstratethecirculationmechanism.With… 相似文献
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INTRODUCTIONJohannes (1 965)firstshowedtheimportanceofprotozoaasremineralizersinmarineenvironments.Thesignificanceofprotozoainthefreshwaterfoodwebhasbeenknownforthepast2 0years.Protozoaisamainpredatorofplanktonicbacteriaandphytoplankton ,andalsoafoodsourceo… 相似文献