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Göran Ågren Department of Ecology Swedish University of Agricultural Sciences

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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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soil c decomposition and temperature the way forward key issues from a modelling perspective

Soil C decomposition andtemperatureThe way forwardKey issues from a modellingperspective

GöranÅgren

Department of Ecology

Swedish University of Agricultural Sciences

slide2

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
slide3

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?

slide4

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

slide5

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?

slide6

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?

slide7

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)

slide8

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

slide9

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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