全球碳循环-Carbon-Sequestration-in-Agricultural-Soils--课件.ppt
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- 全球 碳循环 _Carbon Sequestration in Agricultural Soils 课件
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1、Lecture 9.Carbon Sequestration in Agricultural Soils1.The role of soil carbon sequestration 2.Soil C sequestration process 3.Soil carbon sequestration strategies and management practices 4.Methods of increasing soil carbon sequestration 5.Carbon sequestration potential in USThe role of soil sequestr
2、ation in reducing GHG emissions 1).Soil carbon is a major global carbon poolGlobal estimates of soil organic carbon(SOC)pool0-1 m(Pg)0-2 m(Pg)0-3 m(Pg)Jobbagy and Jackson(2000)150219932344(Source:Jobbagy and Jackson(2000),Ecol.App.10:423-436)Global estimates of soil inorganic carbon(SIC)poolReferenc
3、eSIC pool(Pg)Batjes(1996)695-748Eswaran et al.(2000)940Schlesinger(1982)780-9302)Direct link between soil and the atmospheric carbon pool-cultivation of virgin soils or conversion of natural to agriculturalecosystems leads to depletion of SOC with the emission of GHGs(CO2 and CH4)e.g.the reduction i
4、n SOC pool by 1Pg is equivalent to an atmospheric enrichment of CO2 by 0.47 ppm 3).Misuse agricultural soils can be a major sources of GHGse.g.From 1850 to 1998,global CO2 emissions are estimated to have been:from land use change:13655Pgfrom soil cultivations:78 17Pg During the 1990s,about 25%of glo
5、bal GHGs emissions came from land-use change and soil cultivation(IPCC,1996)The C Cycle in Agricultural EcosystemsCropped soils have been historically depleted in SOC,which can be regained with improved managementC Sequestration and ManagementErosionManage.WaterManage.NutrientManage.ConservationMana
6、ge.EcosystemrestorationWinter cover cropsRestorationof eroded soilsAdoption of recommended management practicesIdentification and implementation of appropriate policiesStrategies for enhancing C sequestration and reducing GHG emissionsin Agricultural SoilsPast Agricultural Practices:-Erosion-Intensi
7、ve tillage-Residue removal-Low productivityImproved Agricultural Practices:-Conservation buffers-Conservation tillage-Cover crops-Improved rotationCRPNo-till:excludes full-width primary,secondary,and subsurface tillage.Sundance system for incorporation on semi-permanent bedsShallow MT:refers to oper
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