松嫩平原鹽漬土水鹽運移的節(jié)律性研究.pdf

1、東北師范大學碩士學位論文松嫩平原鹽漬土水鹽運移的節(jié)律性研究姓名：鄭冬梅申請學位級別：碩士專業(yè)：自然地理學指導教師：許林書20050501AbstractThispapertakesShisanlakeinChanglingdistrictJilinProvinceaSallexample，choosingrepresentativeperiodstoreserVeonthespot、conductcorrespondingtestsan

2、danalyzebycontrastingThentheauthoranalyzethethermodynamicsstructureandtheinfluenceinthefeatureoftransferenceofsoilwaterandsaltelemeutofthealkalizafionofSongnenplaininthepreeipRationperiod、droughtperiod、frozenperiodandtha

3、wingperiodrespectivelyItshowsthatalkalizafionsoilinfrozenseasoninresearchregionholdsthethermalstructure懿following：thefrozenlayerfrozenandtransitionlayerunfrozenlayer；howevertheinthawingseasonthethermodynamicsstructureist

4、hatthawinglayerthawingandtransitionlayerfrozenlayerfrozenandtransitionlayerunfrozenlayer；thethermodynamicsstrucRlreintheprecipitationperiodanddroughtperiodofsoilionarequiltsimplethatthefrozenlayerfadea嘲andthesoiltemperat

5、uregradrelievesgraduallyThetempexaturegradandthesoilwatergradconsistofthedriveoftheaccumulationofsoilwaterandsaltionforalkalizationsollinwinterThesoilsaltionfromthefrozenlayerinwinterhasbeenaccumulatinginthesoilsurfaceIn

6、frozenseason，thetemperaturegradandthesoilwatergradareformedwhenthetemperaturefalldowntothemeltingpointandabstractsoilwaterupwardtothesurfacethroughthesoilcapillaryAsthegradsbecomeseverethesoilwateristransportedtothetrans

7、itionlayerAttheinterfaceofthefrozenlayersolidandliquidwateraremixedtogetherwhichMngaboutsharpwatergradThe掣adsimulatesthepumpingeffecttodevelopfurtherandformthemechanismoftheaccumulationeffectThecapillarywaterprovestobeth

8、emaincarrierofsoilsaltionAsthesoilwaterenrichinthefrozenbeltthesoilsaltiOllaccumulatesinthefrozenlayerInthawingperiod，thefrozenlayerdwindlesfromboththeupperandthedeeptransitionlayerThesolidcrystalformedinwintertakephasec

9、hangepartofliquidwatertransporteddownbygravitytouppertransitionlayertoformthesolutionenrichmentAbovethebelttheevaporationbecomesstronger踮theforthcomingofspringandthesoilsaltionaccumulatesinn塘thawedlayerThesoilwaterinthed

10、eepun矗_o砌soillayerhasbeentransferringsilltothedeeptransitionlayerandtakingphasechangeTheundergroundwaterparticipatesdirectlytheoutsidewaterinfluenceonlywhenthetransitionlayervanishthoroughlyThethermodynamicsmechanismofth