共查询到20条相似文献,搜索用时 15 毫秒
1.
王克林 《中国地理科学(英文版)》1998,(3)
I.INTRODUCTIONItisgeneralyacceptedthatthedegradationofrenewableresourcesandfragileenvironmentsindevelopingcountriesisbecomin... 相似文献
2.
INTRODUCTIONAccumulatedevidencessuggestedaclosecorrelationbetweenneoplasticdiseaseofaquaticor ganismsandtheincreasingreleaseofgenotoxinsbyanthropogenicactivitiesintoaquaticenvironment(Mix ,1 986;Gardneretal.,1 991 ;GESAMP ,1 991 ) .Ithas,therefore,becomenecessarytoe… 相似文献
3.
INTRODUCTIONInrecentyears,co culture (integratedculture )ofmarinespecies (algaeandanimals)hasreceivedgreatattention .Inco culturesystemthealgaeactivelyuptakeCO2 andthemetabolicwastes(suchasNH4 +,NO2 - ,NO3- etc)asnutrientsources,andreleaseO2 tothesurroundingenviron … 相似文献
4.
Ta Liu 《中国地理科学(英文版)》1994,4(3):219-231
刘塔URBANRENEWALANDDEVELOPMENTOFSHANGHAICITY¥LiuTa(NanjingInstituteofGeographyandLimnology,theChineseAcademyofsciences,Nanjing2... 相似文献
5.
INTRODUCTIONAxeniccultureofalgaeisrequiredformanyexperimentalstudiesandcellsuspensioncultures,andisessentialforgainingunderstandingoftherelationshipbetweenthealgaeandtheirepiphyticfloraandmicroorganisms,andforstudyingthegrowthanddevelopmentofalgae (Tat… 相似文献
6.
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
7.
唐森铭 《中国海洋湖沼学报》2002,(1)
INTRODUCTIONThemainpurposeofthisstudywastodeterminethemagnitudeandfrequencyofharmfuldiatomanddinoflagellateoutbreaksinHongKong’swesternandeasternwaters (e .g.LammaStraitsandPortShelterrespectively)fortheperiodJanuary 1 997toDecember1 999.Thiswasdoneinordertod… 相似文献
8.
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
9.
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
10.
1INTRODUCTIONNoonecandoubtthatoneofthemostexcitingsoundsinnineteenthcenturyAmericawasthewhistleofalocomotive.ThroughoutthewholecenturyespeciallyinthesecondhalfrailroadsplayedadramaticroleintransformingtheAmericanwestfromabarrenlandintoapopulatedone… 相似文献
11.
INTRODUCTIONTheHuangheRiverwellknownworldwideforitshighsedimentdischargeisChina’ssecondlargestriver,whoserunoffismainlysuppliedbyprecipitationovertheupperreaches.However,thematerialfromsoilerosionintheLoessPlateauinthemiddlereachesisamajorcontributort… 相似文献
12.
夏宜铮 《中国地理科学(英文版)》1994,4(1):8-18
THEEFFECTSOFTHETHREEGORGESPROJECTONECOLOGYANDENVIRONMENTXiaYicheng(夏宜铮)(InstituteofHydrobiology,theChineseAcademyofSciences,W... 相似文献
13.
I.INTRODUCTIONCitiesarethesymbolsofhuman’scivilization,thespatialcariersofeconomyandthesourcesofregionaleconomicactivities(Gu... 相似文献
14.
Elementscyclingandenergyflowaretheimportantresearchcontentsinecosystemfieldsandresiduade-compositionisthekeyprocessofnutrimentalelementscirculationSWIFTetal.1979.Theresiduade-compositionrateplaysanimportantroleindecidingtheproductivityandbiomassof… 相似文献
15.
INTRODUCTIONFromthe1990’s,thescallop,C.farreri,culturedinthenorthernChinaSea,deterioratedinsize,healthandoutputbecauseofhighstockingdensities,shortageofnaturalfoodanddiseases.Massmortalityof50%-90%occurredinJiaozhouBay,Qingdao,andSishiliwanBay,Yantai,fromJulyto… 相似文献
16.
INTRODUCTIONLimnodrilushoffmeisteri,aubiquitoustubificid ,isapredominantbenthicinvertebrateinmostshalloweutrophiclakesinChina (Liang,1 979) .Sofar,therearenodataonthesecondaryproduc tionofthiswormandfewdataonthatofotherzoobenthosreportedinChina .Withthefisher… 相似文献
17.
DEGRADATION OF NATURAL RESOURCES BY ENVIRONMENTAL POLLUTION——A Comparative Study Between Huizhou City and Zhaoqing City 总被引:2,自引:0,他引:2
1 INTRODUCTIONBothresourceandenvironmentarerelativeconceptions,whicharerelativetothesystemstheyreferto.Theenvironmentofacertainarea(oracertainbusiness)ispossiblytheresourcesofthesurroundingareas(oranotherbusiness).Theatmosphere,waterbodiesandsoilont… 相似文献
18.
1INTRODUCTIONAtpresent,theresearchofnaturaldisastershasgotadvancesintimesequence,butitdevelopsslowlyinspacesequence,especialy... 相似文献
19.
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
20.
1 IntroductionAlongwiththearrivalof2 3rdsolaractivepeakandthedevelopmentofthespacesci ence ,thescientistsaremoreandmoreinterestedintopicsofgeospaceeffectscausedbytheintensesolaractivities.Thegeospaceeffectsofseveralextremesolaractiveevents,suchasthe 1 993No… 相似文献