资源描述：
《Depthwise Carbon Dioxide Production and Transport in a Rangeland Soil .-》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。
1、SoilPhysicsDepthwiseCarbonDioxideProductionandTransportinaRangelandSoilTheobjectiveofthisstudywastodeterminedepthwiseCO2productioninA.K.VermaasemiaridrangelandsoilnearLaramie,WY,andtoquantifythecontrolsDep.ofEcosystemScience&exertedbysoiltemperatureandmoisture.DepthwiseCOM
2、anagement2fluxandproductionwerecalculatedforthe1Nov.2010to31Oct.2011studyperiodDep.3354usingcontinuousmeasurementsofsoilCO1000E.UniversityAve.2concentration,temperature,andUniv.ofWyomingwatercontent.CalculatedsoileffluxusingtwodifferenttortuositymodelsLaramie,WY82071wascom
3、paredwithecosystemrespiration(Reco)asmeasuredbyasurfacefluxchamber.TheeffluxwasmostlylowerthantheRcurrentlyatecovalues,aswouldbeexpected.CalculatedCODep.ofSoil,Water,and2productionforthegrowingseasonwasdominatedbythe7.5-to15-cmdepth(43gCm−2),comparedwiththe0-to7.5-cmEnviro
4、nmentalSciencedepth(17gCm−2)andthe15-to25-cmdepth(9gCm−2).TherelativelyShantzBuilding#38Univ.ofArizonahighproductionatthe7.5-to15-cmdepthwasattributedtothefine-Tucson,AZ85721texturedsoilatthisdepth,resultinginhighersurfacearea,highersoilwaterretention,andpossiblymorefavora
5、bleconditionsforbiologicalactivity.T.J.Kelleners*ThesoilCO2productionincreasedwithsoiltemperature,asexpected,withDep.ofEcosystemScience&temperaturequotient(Q10)valuesof2.98and3.03forthe0-to7.5-andManagement7.5-to15-cmdepths,respectively.Temperature-normalizedCO2productionD
6、ep.3354wasfoundtobeafunctionofsoilwatercontent(θw)atalldepths.Maximum1000E.UniversityAve.productionwasobservedatθ3m−3(0–7.5-cmdepth),θw=0.20to0.21mwUniv.ofWyoming=0.17to0.23m3m−3(7.5–15-cmdepth),andθ3m−3Laramie,WY82071w=0.19to0.22m(15–25-cmdepth).Therangeofwatercontentsfor
7、whichsoilrespirationisatitspeakshouldbeconfirmedforotherrangelands.oilsplayanimportantroleintheglobalCcyclebecausetheycontainsignifi-cantamountsoforganicandinorganicC,andtheemissionofCO2fromtheSsoil(CO2effluxorsoilrespiration)isamajorfluxofCintotheatmosphere(Schlesingerand
8、Andrews,2000).SoilCO2effluxismainlyduetotwoprocesses:(i)productionofCO2duetomicrobial(het
