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The Effect of Priming on Soil Carbon Dynamics: Development and Investigation with CLM4-BeTR

The Effect of Priming on Soil Carbon Dynamics: Development and Investigation with CLM4-BeTR. Jinyun Tang, W. J. Riley, C. D. Koven , Z. Subin and M. Torn . Funded through CSSEF by DOE-BER. the microbe modulated CN system. Plants. Priming. Nutrient N,P. Soil organic matter. Microbes.

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The Effect of Priming on Soil Carbon Dynamics: Development and Investigation with CLM4-BeTR

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  1. The Effect of Priming on Soil Carbon Dynamics: Development and Investigation with CLM4-BeTR Jinyun Tang, W. J. Riley, C. D. Koven, Z. Subin and M. Torn Funded through CSSEF by DOE-BER

  2. the microbe modulated CN system Plants Priming Nutrient N,P Soil organic matter Microbes

  3. CLM4-BeTR:Biogeochemical transport & Reaction

  4. CLM4-BeTR Implementation • Multi-time stepping • Process adaptive • 1D generic tracer transport • Two-layer surface-plant-atmosphere coupling • Multiphase chemistry, fast equilibrium assumption • Explicit tracking of fluxes due to: run-off/on, ice/water phase change, precipitation, dry deposition, ebullition, diffusion s: solid phase g: gas phase w: aqueous phase

  5. Preliminary Model results Single point simulation at Harvard forest

  6. The microbial-cn model DOM microbes PLTR SOM PSOM

  7. Implement the generic microbial-CN model • Microbial groups with different specialties/competitions • Different electron acceptors, e.g. aerobic or anaerobic pathway • Dual status, active or dormant (microbial activity) • Multi-substrate feeding, DOC, DOM • With colonization capability • Step adaptive temporal integration • Fully coupled with plants and atmosphere

  8. Test the priming effect • Hypothesis: More carbon respired than input under favorable conditions Model dynamics: Two microbial communities, compete for DOC and inorganic N (NI), coupled with plants and full CN chemistry

  9. DOC/Ni Punctuated DOC experiment The input was done on Apr.1st, Jun. 1st, Aug. 1stand Oct. 1st in the first model year. All simulations start with identical initial conditions.

  10. change of cumulative heterotrophic respiration Exp 1 Exp 2 Exp 3 Exp 4 Unit: mol CO2

  11. Punctuated DOC/Niexperiment Exp 3 Exp 3 0 Exp 4 Exp 4 0 Changes in Microbial biomass Unit: mol C m-3 soil Changes in litter degradation Unit: mol C m-3 soil s-1

  12. Doc movement EXPERIMENT Microbial activity: fraction of active microbes Immobile: no vertical movement of DOC allowed Mobile: DOC is free to move vertically

  13. Summary • CLM4-BeTR is successfully developed for vertically resolved biogeochemistry modeling • Microbial dynamics is critical to improving the CN modeling • The priming effect depends on the dose of substrate/nutrient input • The vertical movement of DOC may provide a subtle way to increase the carbon sequestration • Measurements are need for serious model evaluations (let me know if someone has measurements, we are open for collaborations!)

  14. The end?

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