PRESSURE OF WATER SHORTAGE ON AGRICULTURE IN ARID REGION OF CHINA

1INTRODUCTIONWiththedevelopmentoftheworld,waterdemandisincreasing,especiallywiththegrowthofpopulationinthelast50years,waterdemandforirrigationhasgreatlyincreasedforfoodproduction.Inthearidandsemi-aridareas,watershortagebecomesaheavierproblemtorestrictfoodproduction,localeconomyandenvironmentalprotection.China,with22%ofthetotalpopulationintheworld,hasonly8%offreshwaterintheglobe;watershortagehasaffectedagricultureandresident'slifeinthenorthernChina.SomescientistsindicatedthatChina'swaters…     

Regional Innovation System: Theoretical Approach and Empirical Study of China

1INTRODUCTIONCOOKEetal.(1996)conductedadetailedsurveyontheconceptsofregionalinnovationsystem(RIS)aftertherevolutionarystudyofFREEMAN(1987)andLUNDVALL(1992)onthenationalinnovationsys-tem.COOKEpointedoutthatRISisagroupofgeo-graphicallyadjacententerprises,R&Dinstitutesanduniversities,whichsupportsandproducesinnovation.WIIGandWOOD(1999)arguedthatthebroadsenseofRISshouldalsoincludethelocalgovernmentsandlocalservicessuchasfinancialbusinessinstitutes.BasedonthereviewofRISconcept…     

INFLUENCE OF SERIES OF SQUARE GRIDS ON FRACTAL DIMENSIONS-A Case Study of Mountains of China's Mainland

The fractal theory has been applied to a wide variety of fields after it was produced. The use of fractal anal-ysis to geographical research has increased (MAN-DELBROT,1967;XU etal.,1993;NINA and DE,1993;ANDRLE,1996;GAO and XIA,1996;ZHU and YANG,2000;WILSON,2001;CHRISTENSENetal.,2002) , but large number of geographical phe-nomena still need to be studied,and many problems still remain unsolved. Although fractal dimensions of lots of phenomena were calculated by the box-cou…     

ANALYSIS OF HABITAT PATTERN CHANGE OF RED—CROWNED CRANES IN THE LIAOHE DELTA USING SPATIAL DIVERSITY INDEX

1INTRODUCTIONThewildlifehabitatlossandfragmentationhavebeenlinkeddirectlytointensivehumandisturbance.Manyecologistshavefocusedonanalysisofwildlifehabitatpatternchangeandconservationofsuitablehabitat.Ingeneral,landscapepatterniscloselylinkedtoecologi-calfunction,andnumerouspatternindiceshavebeencitedtodescribehabitatpatternandsuitability(FRANKLINandFORMAN,1987;HANSENandURBAN,1992;SCHUMAKER,1996;RIITTERSetal.,1997;PEARSONetal.,1999;CHENetal.,1999).WiththeapplicationofG…     

DISPLACEMENT TIME SERIS AT FIDUCIAL STATIONS OBTAINED FROM GPS OBSERVATIONS IN CRUSTAL MOVEMENT OBSEREVATION NETWORK OF CHINA

1　GPSobservationanddataprocessingGPSobservationwasmadeforthefirsttimefromAugust 2 6toSeptember 6in 1 998at 2 5fidu cialstationsoftheCrustalMovementObservationNetworkofChina (markedwithcodesinFig .1andtherearestationnametranslationsinTab .1 ) .SincelateMarch 1 999theobservationhasbeenmadecon tinuouslyatasamplingintervalof 30sec .Duringa3 yearperiodofcontinuousGPSobservation ,therewereproblemsintheobservationdatacausedbyrainwaterleakageintheantennasandotherprob lemsatfiducialstationsTAI…     

PRESENT-DAY CRUSTAL MOVEMENT OF NORTH-EASTERN QINGHAI-TIBET PLATEAU

1　IntroductionEnclosedbyBayankalablockatsouth ,Alashanblockatnorth ,Tarimblockatwest,OrdosatnortheastandSouthChinablocksateast,thenorth easternQinghai Tibetanplateau ,geologicallynamedasQilianblockanditsadjacentarea ,isanidealre gionforstudyingcontinentaldynamics,suchascrustalthickening ,extrusionandblockinteraction(Fig .1 ) .ThetectonicmovementsofnortheasternQinghai Tibetanplateau ,thestrongnappe (thrust ing)movementofnorthernQilianmountainandtheextensiveleft lateralslipalongQilian Hai…     

MULTI-SCALE DECOMPOSITION OF BOUGUER GRAVITY ANOMALY AND SEISMIC ACTIVITY IN NORTH CHINA

1　IntroductionThecrustalstructureofNorthChinahasbeenstudiedalotwithgravitymethod[1 ,2 ] .Theresultsareundoubtedlyofgreatsignificancetoabetterun derstandingofthecrustalstructureofthisregion .Butsofar,neithervertical/lateraldistributionscalesnorcharacteristicsofanomalousdensitybodiesofrockmediaintheregionhavebeenrevealedsystem aticallyintermsofrockdensity .Assurfacegravityanomalyreflectstheoveralleffectofgravityanoma liesofsubsurfaceanomalousgeologicalbodiesatdif ferentdepths,ondifferentscales…     

灵丘小彦-枪头岭岩体地质特征

山西灵丘小彦-枪头岭岩体,多年来一起被认为是单一的花岗斑岩.在近年的区域地质调查中,运用花岗岩基段、超单元、单元填图法,将其定为由A、B、C三个单元岩体组成的超单元岩体.A单元为黑云母辉石闪长岩,并具两期涌动;B单元为斑状黑云母花岗闪长岩,斑状结构,具明显的交代作用;C单元为超浅成酸性侵入岩、角砾熔岩.三单元岩体各具特征,也具有深化的继承性,为一典型的超单元复合岩体.该岩浆源的多期活动,对多金属矿成矿有利,尤以C单元岩体的边部成矿较好.     

INFLUENTIAL FACTORS COMBINATION AND COMPETITIVE ADVANTAGES IN STAGES OF URBAN COMPETITIVENESS——Case Study of Suzhou in China

Comparison of various definitions or discusses of ur-ban competitiveness (UC) reveals that these arguments from different scholars usually start from the following aspects: 1) the capacity of attracting, capturing, pos-sessing, controlling and transforming resources; 2) the life quality level; 3) the capacity of value or wealth creation; 4) the capacity of urban sustainable develop-ment. Actually, among these four aspects there exists a delicate logistic relation. The perspectives of urban sus…     

DISTRIBUTION OF MERCURY IN TYPICAL WETLAND PLANTS IN THE SANJIANG PLAIN

1INTRODUCTIONPlant canaccumulatemercuryfromair,soilandwa-ter.Theconcentrationofmercuryinplantisaffectedbythesource,form ofmercury andthephysiology ofplant.Theconcentrationsofinorganicmercuryandor-ganicmercuryinvariousplantsaredifferent,sotheenvironmentalexposureofmercuryandthebiotopeofplantscanbereflected bytheconcentrationofmer-curyinplants.Wetlandplaysanimportantroleinthetransportandcycleofmercury(DRISCOLLetal.,1994),andisanimportantsourceofmethylmercury ofsomelakesandrivers(STLOUI…