the effect of priming on soil carbon dynamics development and investigation with clm4 betr
Download
Skip this Video
Download Presentation
The Effect of Priming on Soil Carbon Dynamics: Development and Investigation with CLM4-BeTR

Loading in 2 Seconds...

play fullscreen
1 / 14

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


  • 115 Views
  • Uploaded on

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.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' The Effect of Priming on Soil Carbon Dynamics: Development and Investigation with CLM4-BeTR' - lewis


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
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 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!)
ad