表土結(jié)皮形成過(guò)程特征以及與土壤濺蝕的關(guān)系.pdf

1、華中農(nóng)業(yè)大學(xué)碩士學(xué)位論文表土結(jié)皮形成過(guò)程特征以及與土壤濺蝕的關(guān)系姓名：胡霞申請(qǐng)學(xué)位級(jí)別：碩士專(zhuān)業(yè)：土壤學(xué)指導(dǎo)教師：蔡崇法蔡強(qiáng)國(guó)20030601襄土結(jié)皮鯽彤戰(zhàn)過(guò)程特征以投與土壤濺蝕的芙系A(chǔ)bstractThroughrainfallsimulatingunderlaboratoryandmakingsliceofsampling，theprojectresearched；nthesoilcrustdevelopment，andstudie

2、dthedynamicruleoferosion矗ctorswhichwererainingandsollerosionfactorsduringsotlCruStdevelopmentInthesametimetheresearchwastofindthecfiticalconditionofallfactorsintheprocessofsollcrustingandtofilterthecriticalfactorthatcoul

3、daffectsollsurfacecrustTheaimofthisresearchwastoconfirmtheruleofsoilcrustingandthefactorsaffectingtheprocessofsollcrusting，andtoanalyzetherelationshipbetweenthedevelopmentofsollcrustandrainfallsplasherosionfurthermoretos

4、tudytheeffectofsollcrustontheprocessoferosionWehopetoprovidescientificbasesforsotlerosion，KnowledgeandconelusionseducedfromthestudyarefoIlowing：Firstlyprimarydiffefenceb娃weendepositionalCrustandstructuralcrusthasbeendesc

5、ribedDuringrainfallprocessing，soilsurfacewouldbecomegranulated，andtherewouldbealayerofsollcrustwhichwasdominatedbydepositionalCrustAndthereweretwokindsofgranulatedlayerwhichwerealayercoveredwithstonesandalayercoveredwith

6、aggregatesWhereas，soilcrustdominatedbystructuralcrustwasdevelopedthroughraindropstrikingandsoilgrainrenewablyarrangementSecondlyessentiallawofSollcrustformationwasobtained：Whencoarsesandexceeded50％soilCrustdominatedbydep

7、ositionalcrustwouldbeformedWhensollclayexceeded30％andsoilaggregateddegreewaslessthan140％，soilsurfacetendedtoformsoicrustdominatedbystructuralcrustAndsoilcrustdominatedbydepositionalcrustwouldbedeveloped，ifsoilaggregatedd

8、egreeexceeded140％，furthermoresoilclayandsiltcontentwasgreatThirdlythedifierenceofsollsurfacecrustwasobtainedunderdifierentterrainTheresultsshowedthatsollstructurewouldbechangedandthestabilizationofsoilaggergateswouldbech

9、angedunderdifferentlandUSesotherewouldbedifferenceofsoilsurfacecrustdevelopmentFourthlytheeffectofPAMthatreducedsollcrustformationhasbeentakenTheresearchshowedthatPAMcouldimprovesollstructureandgreatlyincreasethestabiliz

10、ationofsoilaggregates、sosoilCrustdevelopmentwouldbedecreasedFifthlysotlgrainthatcontrolsrainfallsplasherosionwasobtained：theinfluenceofsoilclaywasverygreatduringinitialstagesofrainfallWithrainfallgoingonsoilcoarsesandand

11、finesandwouldcontrolthesplasherosionButwhensollcrustwascompleted，sollclayagainwaouldbecometheprimaryfactorSixlysollstructuralfactorsthatinfluenceratndropsplashgreatlyhavebeentakenTheresultsshowedthattheinfluenceofsollinf

12、iltrationcoefficientwasverygreatwhenrainfalltimewas5minuteWithcontinuingofrainfall，theinfluenceofsoil—aggregateddegreewasverygreatSeventhlymutualeffectbetweensollCrustandraindropsplashwasstudi《theresultshowedthatsplasher