共查询到20条相似文献,搜索用时 250 毫秒
1.
Aeropalynology,abranchofpalynologyspeciallydealingwithairbornesporopollencontentanditsvariations,iscloselyrelatedtomanydisciplineslikeplantgeography,bioclimatology,agronomy,andmedicalscienceforwhichalsoneeditsresearchresults.Numerousresearcheshavebeenca… 相似文献
2.
orthernShaanxiisoneoftheregionsexperiencingmostserioussoilerosioninChina.Substantialresearchesindicatedthatinadditiontophysicalfactorsthatplayadecisiveroleininducingsoilerosion,humanfactorsthataccelerateerosionprocesscannotbeignoredeither[1,2,4].NorthernS… 相似文献
3.
JournalofSaltLakeResearchisascientificperiodicalofnaturalsciencewhichisapprovedbytheNationalScienceCommittee,sponsoredbyQinghaiInstituteofSaltLakes.andpublishedbySciencepress.Ourtasksaretocoverandexchangetheresearchreports.scientificpapersandaccomplish… 相似文献
4.
YehuaWei DepartmentofGeography UniversityofCalifornia LosAngeles LosAngeles CA USA 《地理学报(英文版)》1997,(1)
Citysizedistributionofnationalurbansystemshasattractedconsiderableresearchinterest.Theissueisalsocriticaltogovernmentpolicyasitisassociatedwithpopulationdistribution,unevendevelopment,andgeopolitics.Previousresearchefforthasgreatlyenhancedourunderstand… 相似文献
5.
6.
Characteristics of change in the Antarctic sea ice area and its relation to SST in the tropical
Pacific 下载免费PDF全文
1IntroductionBeforethe1980s,Antarcticinvestigationsandtheirresearchdatawererelativelyfew.Sincethe1980s,alongwiththedevelopm... 相似文献
7.
1INTRODUCTIONInfluenceoflanddesertificationonregionalenvironmentalchangehasinthepastfewdecadesbecometheresearchfocusofmanysch... 相似文献
8.
9.
Wang YichengDept of Geography Ningbo Normal University Ningbo CHINAWu QiyanDept of Geography Liaoning Normal University Dalian CHINA 《地理学报(英文版)》1998,(1)
ResearchofthemorphologyofZhejiangcoastalportcitiesWangYichengDeptofGeography,NingboNormalUniversity,Ningbo315211,CHINAWuQiya... 相似文献
10.
11.
12.
A preliminary study on oxygen isotope of ice cores of Collins Ice Cap,King George Island,Antarctica 下载免费PDF全文
ApreliminarystudyonoxygenisotopeoficecoresofColinsIceCap,KingGeorgeIsland,AntarcticaYanMing(闫明)PolarResearchInstituteofChina... 相似文献
13.
Withanareaof1.2millionkm2,andanaltitudeof4000m,theTibetanAutonomousRegionconstitutesthemainpartoftheQinghaiTibetanPlateau,oneofthethreenaturalrealmsinChina.Itconsistsofaseriesofhighmountainsandhighlandswithmanywidevalleysandbasinssandwitchinginbetween.TheH… 相似文献
14.
Zhong Zhaozhan IREIS Institute of Geography CAS Beijing People''s Republic of China Li Kehuang Department of Geography Henan University Kaifeng People''s Republic of China 《地理学报(英文版)》1997,(2)
I.IntroductionTheconceptofecotonehadbeenproposedinecologyandtheecotoneproblemwasdefinitelyputintoresearchprogramgraduallyfromtheInternationalBiologicalProgramme(IBP)(1960s),theManandBiosphereProgramme(MBP)(1970s),totheInternationalGeosphereandBiosphereProgram… 相似文献
15.
THE CASE STUDY ON THE EFFECT OF CO_2 IN CAVE ATMOSPHERE ON STABILITY OF SPELEOTHEM SCENERY IN YAOLIN CAVE, ZHEJIANG PROVINCE, CHINA 总被引:1,自引:0,他引:1
Song Linhua Yang Jingrong Lin Junshu Group of Karstology Speleology Institute of Geography CAS Beijing People’s Republic of ChinaWang Laihong Administration of Yaolin Cave Tonglu County Zhejiang Province People’s Republic 《地理学报(英文版)》1997,(3)
ThevisitorsgivethecaveenvironmentagreatdealofCO2.AverageCO2contentofthevisitorsis13,00015,000ppminthebreedingandonevisitorbreeds40litreofCO2perhour.ThevisitorsstronglyinferencetheCO2contentinthecaveatmosphere.Inspring,CO2contentwas500-600ppminNo.1andNo.2chambersat8:008:… 相似文献
16.
Changes of the relationship between population and environment in the Yangtze River Valley in history 总被引:1,自引:0,他引:1
ZHANG Dixiang SUN PingThe Population Research Institute Wuhan Unviersity Wuchang CHINA 《地理学报(英文版)》1998,(2)
ChangesoftherelationshipbetwenpopulationandenvironmentintheYangtzeRiverValeyinhistoryZHANGDixiangSUNPingThePopulationResearch... 相似文献
17.
18.
Ithasbeenatendencytoconstructatouristdestinationintoatouristcommunityinrecenttourismdevelopment.Becauseofwideconnectionsintourismswithothersectors,itisdifficultfortourismoperatorstoguaranteeasmoothtravelonlybythemselves.Inordertomaketraveleasy,tourismo… 相似文献
19.
Lin Junshu Li Juzhang Fang Jinfu Institute of Geography CAS Beijing People''s Republic of China 《地理学报(英文版)》1997,(3)
IntroductionSolutionasakarstgeomorphologicalprocessinlandformdevelopmenthaslongbeenrecognized.Sincethekarstprocessesarealmostentirelysolution,thoughkarstlandformsarenotonlycausedbysolutionbutalsobyerosion,thecirculationandchemicalcompositionsofkarstun… 相似文献
20.
《地理学报(英文版)》1997,(1)
I.ProgressofUrbanizationinChinaExperiencedFourStages1.19491957activeurbanizationperiodWhenthePeople’sRepublicofChinawasfoundedin1949,therewereonly132citieswithatotalurbanpopulationof39,490,000throughtoutthecountry.Thelevelofurbanization(referringtoratiosofthetotalp… 相似文献