Soil c decomposition and temperature the way forward key issues from a modelling perspective
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Soil C decomposition and temperature The way forward Key issues from a modelling perspective. Göran Ågren Department of Ecology Swedish University of Agricultural Sciences. Litter input I ( q , t ). Respiration = (1/ e -1) P. DECOMPOSERS. NLOM. P / e. P ( q’ , t ). r C ( q , t ).

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Göran Ågren Department of Ecology Swedish University of Agricultural Sciences

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Soil C decomposition andtemperatureThe way forwardKey issues from a modellingperspective

GöranÅgren

Department of Ecology

Swedish University of Agricultural Sciences


Litter input

I(q,t)

Respiration = (1/e-1)P

DECOMPOSERS

NLOM

P/e

P(q’,t)

rC(q,t)

rB(q’,t)

D(q’,q)

q

Quality, q

Quality, q’

µ(q,t)rB(q,t)

  • P Decomposer growth rate

  • e Decomposer efficiency

  • D(q,q’) Dispersion

  • µ Decomposer mortality


Litter input

I(q,t)

Respiration = (1/e-1)P

DECOMPOSERS

NLOM

P/e

P(q’,t)

rC(q,t)

rB(q’,t)

  • P Decomposer growth rate

D(q’,q)

This is normally the only function that is assumed to depend on temperature

q

Quality, q

How rapidly can decomposers use substrate, Arrhenius?

Quality, q’

µ(q,t)rB(q,t)

Do they use different qualities with different rates depending on quality?

How rapidly is substrate becoming accessible?

Does this depend upon quality?


Thornley JHM, Cannell MGR. 2001. Soil carbon storage response to temperature:

an hypothesis. Annals of Botany 87:591-598.

Is mineral associated the same as protected?

Regulatory Gate Hypothesis, Kemmit et al. 2008


Litter input

I(q,t)

Respiration = (1/e-1)P

DECOMPOSERS

NLOM

P/e

P(q’,t)

rC(q,t)

rB(q’,t)

D(q’,q)

  • e Decomposer efficiency

q

Quality, q

Quality, q’

µ(q,t)rB(q,t)

Does it depend upon temperature?


Litter input

I(q,t)

Respiration = (1/e-1)P

DECOMPOSERS

NLOM

P/e

P(q’,t)

rC(q,t)

rB(q’,t)

D(q’,q)

  • D(q,q’) Dispersion

q

It is likely that decomposers’ chemical composition depends on temperature?

Differences in membrane structure

Differences in community composition

Quality, q

Quality, q’

µ(q,t)rB(q,t)

Time scale issue:

If temperature responses depend upon changes in species composition,

how rapidly does the composition respond?


Litter input

I(q,t)

Respiration = (1/e-1)P

DECOMPOSERS

NLOM

P/e

P(q’,t)

rC(q,t)

rB(q’,t)

  • µ Decomposer mortality

D(q’,q)

q

Probably of less importance as decomposer turnover anyhow is rapid

compared to that of NLOM

Quality, q

Quality, q’

µ(q,t)rB(q,t)


Does it matter?

  • P Decomposer growth rate (u0q0b, b)

  • e Decomposer efficiency (e0)

  • D(q,q’) Dispersion (h)

Steady state carbon as a function of parameter values

u0q0b

e0

h

b


Litter input

I(q,t)

What is measured

Respiration = (1/e-1)P

DECOMPOSERS

NLOM

P/e

P(q’,t)

rC(q,t)

rB(q’,t)

D(q’,q)

q

Quality, q

Quality, q’

µ(q,t)rB(q,t)

Mike: ”Are we even studying

the right universe?”

”Maybe, but we seem to only be

scratching the surface”


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