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Lecture9.CarbonSequestrationinAgriculturalSoils1.Theroleofsoilcarbonsequestration

2.SoilCsequestrationprocess

3.Soilcarbonsequestration

strategiesandmanagementpractices

4.Methodsofincreasingsoilcarbonsequestration

5.CarbonsequestrationpotentialinUSTheroleofsoilsequestrationinreducingGHGemissions

1).Soilcarbonisamajorglobalcarbonpool

Globalestimatesofsoilorganiccarbon(SOC)pool 0-1m(Pg) 0-2m(Pg) 0-3m(Pg)JobbagyandJackson(2000) 1502 1993 2344(Source:JobbagyandJackson(2000),Ecol.App.10:423-436)

Globalestimatesofsoilinorganiccarbon(SIC)poolReference SICpool(Pg)Batjes(1996)

695-748Eswaranetal.(2000)

940Schlesinger(1982) 780-9302)Directlinkbetweensoilandtheatmosphericcarbonpool-cultivationofvirginsoilsorconversionofnaturaltoagriculturalecosystemsleadstodepletionofSOCwiththeemissionofGHGs(CO2andCH4)e.g.thereductioninSOCpoolby1PgisequivalenttoanatmosphericenrichmentofCO2by0.47ppm3).MisuseagriculturalsoilscanbeamajorsourcesofGHGse.g.From1850to1998,globalCO2emissionsareestimatedtohavebeen:fromlandusechange: 136±55Pgfromsoilcultivations: 78±17Pg

Duringthe1990s,about25%ofglobalGHGsemissionscamefromland-usechangeandsoilcultivation(IPCC,1996)TheCCycleinAgriculturalEcosystemsCroppedsoilshavebeenhistoricallydepletedinSOC,whichcanberegainedwithimprovedmanagementCSequestrationandManagementErosionManage.WaterManage.NutrientManage.ConservationManage.EcosystemrestorationWintercovercropsRestorationoferodedsoilsAdoptionofrecommendedmanagementpracticesIdentificationandimplementationofappropriatepoliciesStrategiesforenhancingCsequestrationandreducingGHGemissionsinAgriculturalSoilsPastAgriculturalPractices:-Erosion-Intensivetillage-Residueremoval-LowproductivityImprovedAgriculturalPractices:-Conservationbuffers-Conservationtillage-Covercrops-ImprovedrotationCRPNo-till:

excludesfull-widthprimary,secondary,andsubsurfacetillage.

Sundancesystemforincorporationonsemi-permanentbedsShallowMT:

referstooperatesuchasSundanceSystemthatusesdisksandlisterbottomtoincorporatecropresiduesandcultivatethetopsandsidesofthebedsinasinglepass.DeepMT:

isintendedtoreducesoilcompaction.CRP(ConservationReserveProgram):LandseligibleforinclusionwithCRPwerethosewithannualerosionrateof42.8MT/ha(19.1tons/acre),whichis3timesthenationalaverageratesoilerosion.About24%ofalluscroplandiseligibleforinclusioninCRP(currently14.75Mha)Objective:

toconverthighlyerodiblelandfromactivecropproductiontoPermanentvegetationcoverfora10-yearperiod.SoilOrganicMatterCa批se佳S拌tu符dy投:So孔u(yù)t喪h亦Da京ko亂ta扎C撒ar設(shè)bo哨n朗Se稼qu繡es兩tr御at逗io璃n構(gòu)Pr襖oj卡ec嚴(yán)tBa很dl孝an塘dsCu梅st秩er舅S立ta極te淚P照ar詠kSt己ur黨gi虹s客Ra伙ll淡yBl掏ac豈k爺Hi滴ll侮s淚Fo競(jìng)re銅st緩sMt天R呼us纏hm脖or隆eC-漏Lo儀ck光p蘇ro化je左ct戰(zhàn)g猶oa污lsTo社d灶ev寫(xiě)el朝op繩a譽(yù)n影in留te師rn蛾et協(xié)-b碗as浸ed牢r承eg枯is姻tr頭at靜io壺n望sy后st京em釀t興ha州t愚li牙nk掏s級(jí)to植a劃G就eo承g(shù)r旨ap穗hi甲c顫In框fo科rm術(shù)at良io中n斷Sy聲st石em戲(雪GI盾S)跑c茄ou私pl妄ed漿t疊o西so愈il江c殊ar恥bo牙nmo度de醋ls敗t市o中es小ti面ma只te己c礎(chǔ)ar威bo威n務(wù)se悲qu尋es扒tr六at斤io鵲n爐fo嗽r泳ag賊ri漸cu判l(wèi)t屯ur舊al如a江nd吧f劍or脫es譜t稱(chēng)la搶nd剩sTo局q咐ua泄nt桃if哄y員an概d彼ce尼rt耐if蟲(chóng)y扁Ca稼rb阻on緒E促mi等ss決io弄n央Re哈du羽ct柱io虹n贈(zèng)Cr題ed填it聾s啄(C狀ER巾C)th餓at頑c假an細(xì)b的e鹿ge宣ne拐ra闊te惰d澆an央d繡so作ld屢b壞y渾in典di炮vi與du耕al起p冊(cè)ro代du鋼ce春rs貍i咸n魯So鹿ut用h粉Da頸ko專(zhuān)ta貪.Th堂e禁So線(xiàn)ut俘h纏Da蓮ko者ta擴(kuò)C足ar把bo近n何Se序qu圣es接tr敲at邀io隱n枕Pr副oj典ec裂t

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