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简介：Landresourceisthematerialfoundationofhumansurvivalandeconomicdevelopment,andthecultivatedlandistheessenceoflandresources.Thispapertakesthecountyscale,byusingthemethodofGISspatialanalysisandstatisticalanalysisunifies,toexplorethequalityofcultivatedlandinBinchuanCountyusinglevel,andexplaintheutilizationlevelofcountycultivatedlandqualityspatialdifferentiationcharacteristics.Theresultsshowedthat:(1)inthequantityofcultivatedlandqualityandutilizationlevel,theaverageutilizationofpaddylandwasgreaterthanthatofdryland,andthecomprehensiveutilizationofcultivatedlandandsoon.Amongthem,thepaddylandrangedfromgrade6to15,theaverageutilizationwasgrade11.6;drylandrangedfromgrade2to11,theaverageutilizationwasgrade5.9;comprehensiverangeofcultivatedlandisgrade2to15,theaverageutilizationwasgrade8.1;(2)thequalityofcultivatedlandutilizationspatialdifferentiation.Paddyfield,drylandandcultivatedlandandlargevaluedistributioninthecentralandsouthern,invertedVshapedistribution;thesmallerthevaluedistributionintheEastandWest,adumbbellshapeddistribution.Amongthem,theydon’tusealargervalueofpaddylanddistributedinthecentral,Southandsouthwest,themaximumvalueis14.3,thesmallerthevaluedistributionintheWestandEast,theminimumvalueisgrade7;thelargerthevaluedistributionbythedrylandintheSouthandWest,themaximumvalueisgrade10.2,thesmallerthevaluedistributionintheWestandEast.Theminimumvalueisgrade2.3;thecomprehensiveutilizationofcultivatedlanddon’tdistributedlargervalueinthecentral,Southandsouth-west,themaximumvalueisgrade12.7,thesmallerthevaluedistributionintheWestandEast,theminimumvalueisgrade3.5.Thispapercanprovidescientificbasisforthedynamicmonitoringofcultivatedlandquality,thetransformationoflowyieldfarmlandandtheearlywarningofcul

简介：Morletwavelettransformationisusedinthispapertoanalyzethemultitimescalecharacteristicsofprecipitationdataseriesfrom1957to2005inGuyuanregion.Theresultsshowedthat(1)theannualprecipitationevolutionprocesshadobviousmultitimescalevariationcharacteristicsof1525years,712yearsand36years,anddifferenttimescaleshaddifferentoscillationenergydensities;(2)theperiodsatsmallertimescaleschangedmorefrequently,whichoftennestedinabiggishquasiperiodicoscillations,sotheconcretetimedomainshouldbeanalyzedifnecessary;(3)theprecipitationhadthreemainperiods(22year,9yearand4year)andthe22yearperiodwasespeciallyoutstanding,andtheanalysisofthismainperiodrevealsthattheprecipitationwouldbeinarelativehighwaterperioduntilabout2012.

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