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Modelling C sequestration following afforestation/reforestation Preliminary simulations using GRC3 FORESTRY AND FOREST PRODUCTS Keryn Paul Phil Polglase Gary Richards NATIONAL CARBON ACCOUNTING SYSTEM
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Background CSIRO FFP Soil
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GRC3 structure
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Process
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Objective Preliminary testing of GRC3… 1.Development of model structure 2.Identify important pools for sequestration of C 3.Improved knowledge for: - Application of model (avoid misuse) -Management of plantations for C sequestration -Clarify expectations of the role of plantations and soil under a C trading system (set default values)
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Preliminary simulations 7 case studies in Australia Model calibrated to: –Growth –Above and/or below ground biomass –Litter fall –Litter layer mass Model run to generate unverified outputs for soil C
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Case studies Annual rainfall (mm) 4 sites 5 sites 29 sites 3 sites 14 sites 2 sites 3 sites
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Deriving allocation of NPP to stems ObservedPredicted
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Deriving allocation of NPP to roots
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Deriving allocation of NPP to foliage
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Deriving allocation of NPP to foliage & litter decomposition
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Pinus radiata, SA
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E. globulus, low rainfall WA
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E. globulus, SE Vic.
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C removed from atmosphere
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C removed in products
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Change in soil C ?
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?
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Importantprocesses
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NPP StemsBranchesBarkFoliageF. rootsC. roots 3-PG Tree Debris Soil Empirical litter decomp. submodel better?
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Importantprocesses
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NPP StemsBranchesBarkFoliageF. rootsC. roots DeRe Sol.Cel. Lig. 3-PG GENDEC Tree Debris Soil CO 2
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humification of plant cellulose and lignin pools Little available information on change in soil C following afforestation
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Further work… Development of models for decomposition and humification of litter Verification of soil C sub-models –Paired pasture/plantation sites –Soil fractionation
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Summary Potentially large influences of management and climate on C sequestration following afforestation Most C is sequestered by tree biomass Changes in soil C appear be relatively minor, but this needs to be tested
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E. grandis, Q’ld
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P. radiata, NSW
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E. nitens, Tas
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NPP StemsBranchesBarkFoliageF. rootsC. roots DeRe 3-PG Roth-C Tree Debris Soil De Re CO 2 RPMDPMHUM CO 2 ? ? ?
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