简介:TherestorationofforestlandscapehasdrawnmuchattentionsincethecatastrophicfiretookplaceonthenorthernslopeofGreatXing'anMountainsin1987.Forestcanopydensity,whichhascloserelationtoforestproductivity,wasselectedasakeyfactortofindhowmuchtheforestqualitywaschanged13yearsafterfire,andhowfireseverity,regenerationwayandterrainfactorsinfluencedtherestorationofforestcanopydensity,basedonforestinventorydatainChina,andusingKendallBivariateCorrelationAnalysis,andDistancesCorrelationAnalysis.Theresultsshowedthatfireseveritywhichwasinverselycorrelatedwithforestcanopydensitygradewasaninitialfactoramongallthatselected.Regenerationwaywhichdidnotremarkablyaffectforestcanopydensityrestorationinshortperiod,mayshortenthecycleofforestsuccessionandpromotetheforestproductivityofconophoriuminthefuture,Amongthethreeterrainfactors,theeffectofslopewasthestrongest,thepositiononslopewasthesecondandtheaspectwasthelast.
简介:BlueschistaccompaniedbypeliticschistexposealongtheXinlin-XiguitufaultintheToudaoqiaoarea,northeasternChina.Inthispaper,theblueschistissystematicallystudiedonthepetrographyandmineralchemistry.Theamphibolesintheblueschistarezonedfromwinchitecoretomagnesioriebeckite/glaucophanerimtowinchiteoutermostrim.Thepeakmetamorphicconditionsaredefinedbythemineralassemblageofmagnesioriebeckite/glaucophane,epidote,high-Siphengite(Si<7.1),chlorite,albite,hematiteandquartz,indicatinganepidote-blueschistfaciesmetamorphism.TheP-TconditionsareestimatedasT=350–400℃andP=10-12kbar.TheoccurrenceoftheblueschistalongtheXinlin-XiguitufaultstronglysuggeststhefaultisthesuturebetweentheErgunandtheXing'anblockssituatedintheeasternportionsoftheCentralAsiaOrogenicBelt(CAOB).
简介:Basedonthesurveyresearchofpovertycontrollingmodelof'ThreeDrives,FourJoints'inZhen’anCounty,itsformingmotives,implementingmechanism,andconstraintfactorshavebeenexploredtotestifyitsenlightenmentandapplicability,establishingapromotable,applicable,andeffectivepovertyalleviationmodel.'ThreeDrives,FourJoints'modelislinkedtothepoorwholacksabilityofself-development.Relyingonthedrivesfromkeyleadingcompanies,thecapableandtherich,acommunitywithsharedinterestsbythepoorandthesubjectsofthe'threedrives'couldbeformedthrough'JointProduction,JointResources,JointCommunityofStock,andJointOperation'.Thelinkedpovertyalleviationdevelopmentmodelof'theinfluentialandtherichbringalongthepoor'and'Arichhouseholdwouldhelptheothers'comeintobeing.Itisfoundoutthatthemodelof'ThreeDrives,FourJoints'isinessenceapovertyalleviationmethodfocusingontheincreaseoftheincomeanddiversifiedwaysofincreasingtheearnings.Problemsofpovertyalleviationcarrierandjointmechanismhavebeensolvedinthepovertyalleviationprocess.Themodelisinnovativeinactivatingtheresourceelements,helpingtomovethepooroutofpoverty.Areferential,copyable,andapplicablemodelisofferedtoadvancethepovertyalleviationinmountainousareasinChina.
简介:Basedondetailedgeologicstudy,theimportantroleofstructuringintheformationofgolddepositsintheareaisdiscussedwithspecialreferencetostructuralevolution,Syngeneticfaultingcontemporaneouswithtectonic-volcaniceventsisthoughttoberesponsibleforprovidingtheore-formingmaterialatdepth.ThelithofaciesformedbyhighlyalternatingdepositionofterrestrialandcarbonatedetritusischemicallycharacterizedbytheassemblageofAu-Sb-As,constituteingafavorablesourcebedfortheactivationandenrichmentofgold.Thisgoldsourcebedhasundergonefourmajorstagesofstructuraldeformation,accompaniedbymulti-stagedalterationandmineralization.