黑龙江省西部作物生长季降水变化规律的小波分析-豆柴文库

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黑龙江省西部作物生长季降水变化规律的小波分析
Abstract:
Usingwaveletanalysis,thispaperstudiesthevariationpatternofprecipitationduringcropgrowingseasoninthewesternpartofHeilongjiangProvince.Theresultsshowthattheprecipitationinthecropgrowingseasonhasobviousperiodicityandfluctuationcharacteristics,andtheprecipitationinthecropgrowingseasonisaffectedbymultipletimescales.Theprecipitationinthecropgrowingseasonhasdecreasedinrecentyears,especiallyinsummer,whichhasagreatimpactoncropgrowthandyield.Therefore,itisnecessarytotaketimelymeasurestoadapttothechangeofprecipitationpatternandoptimizetheallocationofwaterresourcesinagriculturalproduction.
Keywords:
HeilongjiangProvince,cropgrowingseason,precipitation,waveletanalysis,variationpattern,multipletimescales
Introduction:
HeilongjiangProvinceisoneofthemajorgrainproducingareasinChina,andtheprecipitationduringthecropgrowingseasonisanimportantfactoraffectingcropgrowthandyield.Withthechangeofclimateandhumanactivities,theprecipitationpatternduringthecropgrowingseasoninthewesternpartofHeilongjiangProvincehasundergonesignificantchanges.InordertostudythevariationpatternofprecipitationduringcropgrowingseasoninthewesternpartofHeilongjiangProvince,thispaperuseswaveletanalysistoanalyzetheprecipitationdatafrom1971to2018,andexploretheinfluenceofmultipletimescalesonprecipitationduringthecropgrowingseason,soastoprovidescientificbasisforagriculturalproductioninthisarea.
Dataandmethods:
Theprecipitationdatafrom1971to2018inthewesternpartofHeilongjiangProvincewereobtainedfromChinaMeteorologicalDataSharingServiceSystem.Thedatawereprocessedandanalyzedbywaveletanalysismethod.Waveletanalysisisamathematicaltoolforanalyzingthetime-frequencydomainofnon-stationarydata.Itcaneffectivelyanalyzetheperiodicityandfluctuationcharacteristicsofnon-stationarytimeseries,andrevealtheinfluenceofmultipletimescalesonthevariationoftimeseries.
Resultsandanalysis:
1.Periodicityanalysis
Thewavelettransformofprecipitationdataduringcropgrowingseasonfrom1971to2018wasperformedbyusingMorletwavelet.Ther