摘要
Themethaneconcentrationprofilefrom-1.5mdepthinsoilto32mheightinairwasmeasuredinalpinesteppelo-catedinthepermafrostarea.Methaneconcentrationsshowedwidelyvariationsbothinairandinsoilduringthestudyperiod.Themeanconcentrationsinatmospherewereallhigherthanthoseinsoil,andthehighestmethaneconcentrationwasfoundinairattheheightof16mwiththelowestconcentrationoccur-ringatthedepthof1.5minsoil.Thevariationsofatmosphericmethaneconcentrationsdidnotshowanyclearpatternbothtemporallyandspatially,althoughtheyexhibitedamoresteady-stablestatethanthoseinsoil.Duringtheseasonalvariations,themethaneconcentrationsatdifferentdepthsinsoilweresig-nificantlycorrelated(R2>0.6)witheachothercomparingtotheweakcorrelations(R2<0.2)betweentheatmosphericconcentra-tionsatdifferentheights.Meanmethaneconcentrationsinsoilsignificantlydecreasedwithdepth.Thiswasthecompositiveinfluenceofthedecreasingproductionratesandtheincreasingmethaneoxidationrates,whichwascausedbythedescentsoilmoisturewithdepth.Althoughthemethaneconcentrationsatalldepthsvariedwidelyduringthegrowingseason,theyshowedverydistincttemporalvariationsinthenon-growingseason.Itwasindicatedfromtheliteraturesthatmethaneoxidationrateswerepositivelycorrelatedwithsoiltemperature.Thehighermethaneconcentrationsinsoilduringthewinterweredeter-minedbythelowermethaneoxidationrateswithdecreasingsoiltemperatures,whereasmethaneproductionrateshadnoreactiontothelowertemperature.Relationsbetweenmethanecontributionandotherenvironmentalfactorswerenotdiscussedinthispaperforlackingofdata,whichimpulseustocarryoutfurtherandmoredetailedstudiesinthisuniquearea.
出版日期
2009年01月11日（中国期刊网平台首次上网日期，不代表论文的发表时间）
