采伐剩余物管理方式对二代杉木幼林生产力的影响-(8271)

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1、——一墨垡型叁塑篁堡查蒌翌三垡堑查垫整竺兰垄塑墅堕Threeyearsaftertreatment,atO-10cm，10-20Bmand20-40cmsoillayers，availableKincreased50．50％，21．25％and25．07％，respectively．Sixyearsaftertreatment，availableKsignificantlyreducedatallsoillayersthanthreeyearsaftertreatment．but5．34％higherat

2、O-10cmsoillayerthanpre-harvestlevel，anddecreasedat10-20cmand20-40cmsoillayersby8．16％and10．25％。respectively,thanpre-harvestlevels．Thereweresignific{mtchangesofavailableKatthedifferentsamplingtimes．Threeyearsaftertreatment，totalPandtotalKslightlyincreasedat

3、allsoillayersindifferentsamplingtimes，butslightlyreducedatsixyearsaftertreatment，butwerealsolittlehigherthanpre-harvestlevel．Butnosignificantdifferencewasfoundbeweenthetreatments，TheonlysoilpropertybeingsignificantlyaffectedbyvarioustreatmentsWaSthepHvalu

4、eat0—10cmsurfacesoillayer．Threeandsixyearsaftertreatment,soilpHvalueatO一10cmsoillayerofnoslashtreatment(BL0)weresignificantlowerthanthoseofdoubleslashtreatment(BL3)andstemandbarkharvestandslashburningtreatment(SB)．Retentionofslashfromthefirstrotationplant

5、ationcouldincreasesoilpHvalue，andreducesoilacidity．Threeandsixyearsaftertreatment，organicCandtotalNcontentwerethehighestindoubleslashbranchestreatment(BL3)，butnoslashtreatment(BLo)orstemandbarkharvestandslashburningtreatment(SB)werethelowest，butnosignific

6、antdifferenceswerefound．Threeandsixyearsaftertreatment，organicCandtotalNcontentslightlyincreasedordecreasedat0-10cmsoillayeronlyinstemandbarkharvesttreatment(Bk)anddoubleslashtreatment(BL3)'butdecreasedsignificantlyintherestoftheother3treatments．Threeyear

7、saftertreatment，hydrolysisNWasnosignificantdifferenceat0-10cmand10-20cmsoillayersbetweendifferenttreatments，butsixyearsaftertreatment，hydrolysisNofdoubleslashtreatment(BL3)Wassignificanthigherthanthoseofnoslashtreatment(BLo)．SoilavailableKWassignificantaf

8、fectedbydifferenttreatments．Threeyearsaftertreatment，soilavailableKat0-10cmand10-20cmsoillayersindoubleslashtreatment(BL3)weresignificantlyhigherthannoslashtreatmentfBLo)．SoiltotalPandtotalKwerelittleaffecedbydiffer