Soil Aggregate Stability(4)

土壤团聚体的经典文章

Research,Reviews,Practices,PolicyandTechnology85

lizinghascro-aggregatesbeenmechanismssuggestedinthatthedisintegrationsoilareslaking,ofclaythesoildispersionmacro-aggregatesandclayswelling.Itsion,isthefirststepinthelossofsoilstructure,whileintomi-1987;atime-dependentchemicalprocess,isthesecondstep(Abu-Shararclaydisper-etal.,1989,Quirkgatescalesstability1990;andSoMurray,1991;Shainbergetal.,1992a;LeBissonnais,1988,canandbeAylmore,performed1993).atThedeterminationoffieldsoilaggre-surementtheencesatmethodologythesamescale,isdifferent.differenttheremayEvenbeimportantamongscalesmethods(smallorlarge).Atthesedifferences.ofstabilityThesediffer-mea-tionsmayberelatedtooneormoreofthefollowingaspects:(1)thethetreatmenttest,ofparticularlysamplecollection,(2)thecharacteristicsofthesamplesubjectedcondi-toting,differenttimeappliedofshakingtoitsthestructure,aggregatesize,andmoisturecontent;(3)thethesample,sample,suchasthewettingtechnique,rateofwet-disaggregationdegreesofdisruptiveenergyraindropapplied;impact(4)energytheetc.,whichpresenttheetertreatment,andand(5)dispersion,theexpressionwhichofistheoftenresult,notthatclearlymeasurementis,thedistinguishedofstabilityparam-fromthecomplicatesTheused.

calculationliterature.thecomparisonandexpressionamongofaggregateaggregatestabilitystabilityindifferentwaysaggregateItalsomakesdifficulttoobtainaconsistentdatacorrelationpresentedinthetheresionsareapparentstabilityandsoilerodibilityorcrustingpotential.Inthisbetweensense,datamineareaboutmadethewithoutcorrelationcontradictionsintheliterature,duetothefactthatconclu-consideringbetweentheaggregatedifferentstabilitymethodologiesdataandusederodibilitymethodologybothparameters.Consequently,itisimportanttopayattentiontodeter-totheastandardizationusedofwhenthemethodologycomparingstabilityresults.Toavoidtheseproblemsconfusion;Ontheotherhand,thetermsusedwouldinthebenecessary.

literaturecanleadmacro-aggregatesomeusereferstabilitytheterm‘‘aggregatestability’’toreferindistinctlytosometodetermineitonlytomacro-aggregateand/ormicro-aggregatestability.Forexample,stability,thewhereasothersityusuallytests,’’stabilitywhileofmacro-aggregatesareusuallycalled‘‘aggregatetestsusedstabil-toarecalled‘‘dispersionthetestsusedtests.’’todetermineWater-stablestabilityandofmicro-aggregatesareusedcommonlyAggregates,’’parameterusedtermstorefertomacro-aggregatewet-aggregatestability.ThestabilitymostcludethisstabilityWSA.todescribeofmacro-Wethink,macro-aggregateandmicro-aggregates;however,thatstability‘‘aggregateisthe‘‘WaterStableso,inthisstability’’paperwemayin-ingtermasasynonymofsoilstructuralstabilityorsoilaggregation,willinclud-useandthemicro-aggregatestabilityofallstability.

aggregates,andwewilldiscriminatebetweenmacro-Downloaded by [Research Center of Eco-Environmental Sciences] at 04:22 02 December 2011