鄂南幾個紅壤在降雨過程中表土結(jié)構(gòu)變化及侵蝕響應(yīng).pdf

1、華中農(nóng)業(yè)大學(xué)碩士學(xué)位論文鄂南幾個紅壤在降雨過程中表土結(jié)構(gòu)變化及侵蝕響應(yīng)姓名：孫站成申請學(xué)位級別：碩士專業(yè)：土壤學(xué)指導(dǎo)教師：蔡崇法丁樹文20030601鄂南幾個紅壤在降雨過程中表結(jié)構(gòu)變化及侵蝕響應(yīng)AbstractTheprojectwascarriedouttostudythechangesoftopsoilsurfacestructureandtherelationshipbetweensoilsurfacestructuralchan

2、geandthesoilerosionundersimulatedrainfall，bymeasuringerosionparameterandobservingsoilsurfacemicromorphologyduringtheprocessofrainfallnleredseveralsoilssuchasHl、H2、H3、T1、T2、T3werederivedfromthreedifferentparentmaterialsin

3、hubeiprovinceWehopetoprovidethetheoryforthelossofsoilandwaterinsouthernhillinChina1ThetexturesofH1，H2，H3，T1，T2，T3wereclayloam，siltyclayloam，saltyloam，sandclaysandyloamsoil，sandloamsoilSoilerosionwouldchangesoilmechanicco

4、mpositionAsforH2andH3derivedfromquaternarydeposits，thetexturesofsoilswouldbecomeheavybecauseofsoilerosionwhereasT2andT3ofredsoilofgranitebecamesandificationThebreakdownofsoilaggregateswasthepremiseofsoilerosion，anddisper

5、sionratioexplainedthestabilizationofsoilaggregatesofsixexperimentalsoils，whichWaScalculatedbythecontentofmicroaggregatesTheDRofH1，H2，H3，T1，T2，T3wereO84，O68，O58，O62，087，O92，AndtheorderwasT3T2H1T1、H2H32Thephotosofsoilmicro

6、morphologyexplainedthedevelopmentofsoilsurfacestructureduringtheprocessofrainfallTheresultsshowedthattherewerethreephaSesincludingtheprecedingofrunoifprecedingofrunofftostabilityofrunoifstabilityofrunoffThethreephasesrev

7、ealedthedevelopmentofsoilstructure，whichwastheprocessfromloosentOtighten，fromunstabilitytostability3，SoilsplasherosioniSoneofthemostimportantparametersofsoilerosionTheresultsshowedthattheamountsofT2andT3werehighest，andth

8、eratesofsoilsplasherosionwerelowerduringtherainfallof20rainThectlrveofHlwasdescending，andtheotherssoilswereascendingduringprophaseofrainfall，descendingafter10minTheresultsofdifferentparticlesizeaggregatesshowedthat，thecn

9、rveofsplasherosionofaggregatesof025mm，thecurvewasaScendingduringprophaseofrainfall，thendescendingAccordingtoaggregatesofdifferentparticlesizes，thesplasherosionrateofO5～lmmaggregatesWAShighest，and2—3mmWaslowestTheeffectof

10、splasherosiononslopingsurfaceerosionisevidentAfterthesplasherosionwaseliminated，theerosionamountwasleSSthanhalfoftheamountwhenthesplasherosionexisted，Itindicatedthesplasherosioncontributedmorethan50％erosionamount，buttoth