首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献,搜索用时 15 毫秒
1.
I.INTRODUCTIONItisgeneralyacceptedthatthedegradationofrenewableresourcesandfragileenvironmentsindevelopingcountriesisbecomin...  相似文献   

2.
I.INTRODUCTIONUptothepresent,severaltheoreticalandimportantpracticalproblemshavebeensolvedinkarstgeomorphology.However,alongw...  相似文献   

3.
I.INTRODUCTIONAtpresent,globalclimatechangehavebeenwidelypaidatentiontointernationaly.Climaticandenvironmentalchangesfromloc...  相似文献   

4.
1 INTRODUCTIONBothresourceandenvironmentarerelativeconceptions,whicharerelativetothesystemstheyreferto.Theenvironmentofacertainarea(oracertainbusiness)ispossiblytheresourcesofthesurroundingareas(oranotherbusiness).Theatmosphere,waterbodiesandsoilont…  相似文献   

5.
1INTRODUCTIONNoonecandoubtthatoneofthemostexcitingsoundsinnineteenthcenturyAmericawasthewhistleofalocomotive.ThroughoutthewholecenturyespeciallyinthesecondhalfrailroadsplayedadramaticroleintransformingtheAmericanwestfromabarrenlandintoapopulatedone…  相似文献   

6.
I.INTRODUCTIONThereisaclosecorelationbetweenthelocationofalandparcelanditsvalue.Arealestateexpertoncestatedthatthefactorsdete...  相似文献   

7.
INTRODUCTIONRedtidesoccurredinXiamenHarborin1986and1987.Thelocalmarinescientistscloselyobservedtheseredtidesandobtainedmuchusefuldata(Zhangetal.,1988;Du,1989;Zhuang,1991;Chengetal.,1993).Butsimultaneoustransientwatermovementalwaysmadeitdifficulttoinvestigatetheseredti…  相似文献   

8.
I.INTRODUCTIONAcommonviewpointinthespatialinteractionliteratureisthatitisnecesarytoacknowledgespatialstructureefectsand/orde...  相似文献   

9.
INTRODUCTIONTheproxyofstableoxygenisotopeinlakecarbonateisidealforthereconstructionofpastcli mate (Gasseetal.,1 991 ;Wu ,1 996;Zhangetal.,1 994 ) .Asidefrombeingimpactedbylake watertemperature ,thevalueofδ18Oinlakecarbonateisalsocontrolledbythatofambientlakewa ter.High…  相似文献   

10.
I.INTRODUCTIONSoilrespirationisCO2evolutionprocessfromsoiltoatmosphere.Itismainlyproducedbyoxidizingorganicmaterbymicroorgan...  相似文献   

11.
Land-cover survey in northeast China using remote sensing and GIS   总被引:1,自引:0,他引:1  
I.INTRODUCTIONWiththerapiddevelopmentofnationaleconomyandthegrowthofthepopulationsincethe1990s,therecomesnewdemandsforexploit...  相似文献   

12.
Web GIS: Implementation issues   总被引:1,自引:0,他引:1  
1 INTRODUCTIONWiththerapidexpansionanddevelopmentofIn ternetandWWW (WorldWideWeborWeb) ,WebGIS (WebGeographicalInformationSystem )isbe comingevermorepopularandasaresultnumeroussiteshaveaddedGIScapabilityontheirWebsites(BOSTONetal .,1994 ;PUTZ ,1994 ;SHIFFER ,1995;SOVI…  相似文献   

13.
INTRODUCTIONItiswellestablishedthatinmammals,growthhormone (GH)elicitsitsgrowth promotingac tionindirectlythroughtheinsulin likegrowthfactor I(IGF I)producedmainlyintheliver.Asforteleostfishes,Inuietal.(1 985 )reportedstimulatinginvivoandinvitroeffectsofovineGH…  相似文献   

14.
I.INTRODUCTIONSince1980,NortheastAsiahasexperiencedarapidregionaleconomicunificationagainsteconomicglobalization.TheTumenRive...  相似文献   

15.
I.INTRODUCTIONMostvolcanoesaredistributedinnortheastofChina.Thevolcaniceruptionscanchangethegeneralmorphologicconfigurationof...  相似文献   

16.
1 ADVANCINGOFTHEQUESTIONANDCONSTRUCTIONBACKGROUNDOFSUZHOUINDUSTRYGARDENPerroxgavespecialattentiontotheeffectofimportantitemsandconstructionofinfrastructurewhenhediscussedtheproductionofgrowthpole(Li,1988).Lotsofdomesticscholarshavealsoprobedintothi…  相似文献   

17.
1INTRODUCTIONTheremarkablesocialandeconomicchangeinthePearlRiverZhujiangDeltaPRDsincethelate1970shasmadeitafocalpointinreformeraacademiccircles.ManystudieshavebeendoneonthePRDitsregionaleconomicdevelopmentandrestructuringLIN1997LINetal.1995…  相似文献   

18.
I.INTRODUCTION“Agenda21”recognizestheimportanceoflandbasedsourcepolutantstomarinepolution.Coastalwaterisofgreatsignificance...  相似文献   

19.
INTRODUCTIONKnowledgeofmarineCymothoidaeofChinesewatersispoor,exceptforthecontributionsofYu( 1 93 5)andShen ( 1 940 )intheearly 2 0thcenturyandYuandLi( 2 0 0 2 ) .AmongNerocilaisopodspecimensdepositedintheInstituteofOceanology,ChineseAcademyofSciences (IOCAS) ,wasaform (c…  相似文献   

20.
1INTRODUCTIONGeothermalanomalyisaphenomenonthatunder-groundtemperatureandgeothermalgradientincreasesmuchmoreintheareathanitssurroundingsXIA1979.Thisisanormalglobalphysicalphenomenonintheactiveandthelatentvolcanicarea.Duringthewarningsignperiodofan…  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号