Soil Aggregate Stability(12)

土壤团聚体的经典文章

Research,Reviews,Practices,PolicyandTechnology93

lizebrokenaggregatesculantanddisaggregationagainstslakinghasandoccurred,disaggregation,theorganicbutmatteronceactstheseasbondsaareIneffectthis(Emerson,1983;Goldbergetal.,1990;andItamiandKyuma,defloc-1995).soilofsense,organicGoldbergmatteretonal.soil(1990)structureandNadlerisafunctionetal.(1996b)ofthesizesuggestscalethatofthetheoverparticlesaggregates,theparticleanalyzed.charge(GoldbergThus,inclay-sizedetaggregates,organicmatteracts(TisdallroaggregationandorganicOades,matter1982).actsThus,asaOMbindingal.,1990),wouldagent,whereashavethroughincoarsesand-sizeddifferentrootseffectsandonhyphaemac-Kretzschmaraggregates(changing(colloidaletthanal.(1993)onmicroaggregation.stability)foundHeilandSposito(1993b)andwasthatnottheeffectcausedofbyorganicmatterinclay-sizedconsistpolymers.oftheapproachThestericparticlecharge),butbystericmechanisms.electrostaticStericmechanismsmechanismspolymerrepulsioncoatingresultingactsasfromatheoverlapofadsorbedorganicreducingoftwocoatedparticlestotwicehardthethicknesssurface,andlimitstheclosestbetweentheeffectivenessofattractiveshort-rangevanofanderadsorbedWaalsforceslayer,al.,Othermineralmore1994),workssuggestinghaveparticlesfound(HeilthatsomenocorrelationandSposito,componentsbetween1993b).

oftheOMorganicandWSAcarbon(Carterpoolareet1990).activelyfractionRobersoninvolvedtotal(HF)soiletinstabilizingaggregatesthanothers(PerfectandKay,carbohydrateal.(1991)anicCandtotalcarbohydratewerenotsignificantlysoilstructure,correlatedwhilewithwere(1995)postulatedHot-waterbyextractableHaynesandcarbohydrates,Swift(1990)whichandhavemicrobialorigin,andtobeinvolvedinsoilaggregatestabilitization.GijsmanGolchinandetal.Thomas(1994)closelyPugetetal.(1995)indicatedthatthestabilityofsoilstructureismorecontent.

relatedtotheyoungandactiveSOMfractionthantototalSOMmacro-aggregationInsummary,theingandcontradictoryorganicmatterresultsarefoundduetointhecorrelationsamongaggregation,reasons:(1)further(2)onlytherepartisaofcontenttheorganicoforganicmatteroneormoreofthefollow-carbonisresponsibleabovewhichforwater-stablemajorincreaseinwater-stableaggregation,(3)organicmaterialstherearenotisthenoamountbindingofagents,and(4)itisthedispositionratherthanthetypeortransientThestabilizingorganicporarilyaggregatingeffectmattereffectofwhichorganicisimportantofpolysaccharidesmatterresults(TisdallandOades,1982).onfrommicro-aggregates,thecombinationtheoftem-thepersistantstabilizingSeveralworkseffecthaveofpolymerseffectofrootsandhyphaeonmacro-aggregates,andtheconfirmedandthesearomaticconclusionscompoundsstudyingonmicro-aggregates.thedistributionof

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