摘要
AnaggregatestabilitytestandasimulatedrainfalltestwereconductedonfourrepresentativeUltisolsfromsoutheasternChina.Thesoilsselected,withclaycontentsrangingbetween117and580gkg-1,werederivedfromshaleandQuaternaryredclay.Thestabilityofaggregates(2–5mmindiameter)obtainedfromthesoilsamplesweredeterminedbytheLeBissonnaismethod.Fordeterminationofinfiltration,runoff,anderosion,thesoilsampleswerepackedin30cm×60cmtrays,wettedatratesof2,10,and60mmh-1,andthenexposedtosimulatedrainfallat60mmh-1for1h.Theresultsindicatedthatbothaggregatestabilityandslakingcausedbyfastwettingincreasedwithincreasingclaycontent.Theeffectofwettingrate(WR)oninfiltrationandsealformationvariedwithclaycontents.Inthesoilwithlowclaycontent(sandyloam),theinfiltrationratewasaffectedslightlybyWRduetolowaggregatestabilityandslaking.Inthesoilswithmediumclaycontent(siltclayloamandclay),WRaffectedinfiltrationsignificantlyduetothehighaggregateslakingforce.Inthesoilwithhighclaycontent,theeffectofWRoninfiltrationwassignificant,butnotasevidentasinthesoilswithmediumclaycontent,whichmayberelatedtohighaggregatestabilitybywettingpartiallycompensatingforslakingforce.TheeffectofWRonsoillosswassimilartothatofrunoff,butmorepronounced.ThefindingsfromthisstudyindicatedthattherelationshipbetweenwettingrateandclaycontentshouldbeconsideredwhenpredictinginterrillerosioninUltisols.
出版日期
2010年01月11日（中国Betway体育网页登陆平台首次上网日期，不代表论文的发表时间）
