The effect of priming on soil carbon dynamics development and investigation with clm4 betr
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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

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
the microbe modulated CN system

Plants

Priming

Nutrient

N,P

Soil organic matter

Microbes


Clm4 betr biogeochemical transport reaction
CLM4-BeTR:Biogeochemical transport & Reaction


Clm4 betr implementation
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


Preliminary model results
Preliminary Model results

Single point simulation at Harvard forest


The microbial cn model
The microbial-cn model

DOM

microbes

PLTR

SOM

PSOM


Implement the generic microbial cn model
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


Test the priming effect
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


Doc n i punctuated doc experiment
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.


Change of cumulative heterotrophic respiration
change of cumulative heterotrophic respiration

Exp 1

Exp 2

Exp 3

Exp 4

Unit: mol CO2


Punctuated doc n i experiment
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


Doc movement experiment
Doc movement EXPERIMENT

Microbial activity: fraction of active microbes

Immobile: no vertical movement of DOC allowed

Mobile: DOC is free to move vertically


Summary
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!)



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