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1.
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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THE BIOGEOCHEMISTRY OF PHOTOSYNTHETIC PIGMENTS IN THE JIULONG RIVER ESTUARY AND WESTERN XIAMEN BAY 总被引:2,自引:0,他引:2
INTRODUCTIONKnowledgeofthedistributionandcompositionofthechlorophyllandcarotenoidpigmentsincoastalmarinewatersprovidesinformationonthephytoplanktonbiomassandalsoonitschemotaxon omy ,thecontributionofriverineinputs,andtheearlydegradationroutesoccurringi… 相似文献
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SEVERAL PROBLEMS ABOUT THE ECO ENVIRONMENTAL RESEARCH ON THE SOURCE REGIONS OF THE CHANGJIANG RIVER AND THE HUANGHE RIVER 总被引:1,自引:1,他引:0
1 INTRODUCTIONInrecentyearstheecoenvironmentoftheChangjiangRiverbasinsufferedfromseveredestruction,sedimentcontentintheriverwatergreatlyincreased,thedownstreamcoursewasseriouslysiltedupandfloodcontrolcapacitywasweakened.Thesimilarsituationalsooccu… 相似文献
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INTRODUCTIONMorethanadecadehaspassedsincebacteriawasrecognizedasquantitativelyimportantcon sumersoforganiccarboninmarinefoodwebsandmarineecosystems (Fuhrman ,1 992 ) .ThebasicinformationonthesignificanceofthemicrobialfoodwebwaspresentedbyPomeroy ( 1 974 ) ,whopie… 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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THE STEPS FORWARD OF GIS IN CHINA 总被引:2,自引:0,他引:2
1 HISTORICALSTEPS—ATEMPORALANA LYSISResearchesofGISinChinacandatebacktotheearly 1980s .Atthattime ,aremotesensingapplica tionprojectwascarriedoutinSouthwestChinausingGISmethodintegratedwithremotesensingdatatosolvetheareameasurementautomatically .Afterthefir… 相似文献
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INTRODUCTIONTheWesternPacificWarmPool (WP)isaseaareawhereseasurfacetemperature (SST)isthehighestintheglobaloceansandair seainteractionisthemostviolentinthePacific.Manyre centresearchesshowedthatvariationsinthethermalconditions (inSST ,especially)oftheWPplay… 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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THE SIMULATED STORAGE CAPACITY OF FLOOD AND WATERLOGGING IN THE TYPICAL AGRICULTURAL REGION IN JIANGHAN PLAIN 总被引:2,自引:0,他引:2
1INTRODUCTIONJianghanPlainisoneoftheimportantbasesofChina′sagriculturalproductivitylocatedinthemiddleChangjiangRivervalleyofcentralChina.TheJianghanplainapproximately6.6×104km2inareaandover30millioninpopulationistherenowned“countryoffishandrice"in… 相似文献
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INTRODUCTIONTheSouthChinaSea (SCS)isasemi enclosedoceanbasinlocatedataspecialgeographicpo sition ,oneoftheworld’spronouncedmonsoonregions,withnortheastwindsprevailinginwinterandsouthwestwindsinsummer,andisacrucialregionofintensiveair seainteractionofgreat… 相似文献
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1 CHANGESOFINDUSTRIALSTRUCTURE1.1 ChangesofStructureofThreeEconomicSectorsSincethereformofeconomicsystemandopeningtotheoutsideworldinthelate1970s,theindustrialstructureofGuangdongProvincehasbeenexperiencinganobviousprocessofnonagriculturalizationw… 相似文献
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1 Introduction18Oinmarineenvironmentplaysanimportantroleinoceanographicalstudy .Asastableisotopeofoxygen ,18OtogetherwithhydrogenatomsconstituteswatermoleculeH218OandmoveswithalargeamountofH2 Omoleculesinseawater.Sothatδ18Obecomesanidealtracerforthemovemento… 相似文献
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INTRODUCTIONMicrocystisaeruginosawasthemainbloom formingspeciesinDonghuLake;occurredonlysporadicallyinthe 1 950s,increasedrapidlyinnumberinthe 1 960s.Fromthemiddleofthe 1 970stothemiddleofthe 1 980s,thicklayerofitsbloomcoveredthelakesurfaceeverysummer,attract ingfo… 相似文献
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INTRODUCTIONPhosphorusisakeynutritiveelementforthegrowthofmarinephytoplankton .Recently ,be causeofenvironmentalpollution ,theeutrophicationproblemsincoastalandoceanicwatershavebe comemoreandmoreserious.Theenvironmentecologicalresponseinthelong termtothef… 相似文献
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1INTRODUCTIONTheremarkablesocialandeconomicchangeinthePearlRiverZhujiangDeltaPRDsincethelate1970shasmadeitafocalpointinreformeraacademiccircles.ManystudieshavebeendoneonthePRDitsregionaleconomicdevelopmentandrestructuringLIN1997LINetal.1995… 相似文献
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I.INTRODUCTIONTheglobalaveragesurfaceairtemperatureoftheearthhasincreasedbyabout0.5℃sincethemid19thcentury(Houghtonetal.,19... 相似文献
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INTRODUCTIONOceantidesplayaveryimportantroleinthedynamicsoftheEarthandhaveattractedmanypeople’sattentionsinceancienttimes.Beforethelate 1 970s,tidesweremeasuredmainlybycoastalgauges .Directmeasurementsaswellasnumericalsimulations,canprovidefairlyaccurateu… 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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INTRODUCTIONLimnodrilushoffmeisteri,aubiquitoustubificid ,isapredominantbenthicinvertebrateinmostshalloweutrophiclakesinChina (Liang,1 979) .Sofar,therearenodataonthesecondaryproduc tionofthiswormandfewdataonthatofotherzoobenthosreportedinChina .Withthefisher… 相似文献
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INTRODUCTIONEriochoirsinensisinChinaiscommonlycalledmittencrab .Itisanadromous,withindividualsmovingfromfreshtomarinewatertospawn .Therearetwocommercialpopulations:ChangjiangRiv er (CR)andLiaoheRiver (LR) .Thesetwopopulationsareverydifficulttoidentifyfromth… 相似文献