Bayesian calibration of the ICBM/3 soil organic carbon model constrained by data from long-term experiments and uncertainties of C inputs

Menichetti, Lorenzo (author): Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för ekologi,Department of Ecology

Kätterer, Thomas (author): Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för ekologi,Department of Ecology

Bolinder, Martin (author): Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för ekologi,Department of Ecology

(creator_code:org_t)

Related links:: https://pub.epsilon.... (primary) (Raw object) (free); show more...; https://res.slu.se/i...; https://doi.org/10.1...; show less...

Abstract Subject headings

Models with various complexity can asses soil C sequestration in agriculture. In this study, we updated the Introductory Carbon Balance Model (ICBM) with 28 years of additional data and included multiple long-term bare fallow experiments for old pool kinetics. We validated the model with data from a new long-term sister experiment. The new calibration included uncertainty in the estimation of below-ground C inputs to soil. The model now considers above- and belowground and external C inputs separately (ICBM/3). The underlying mathematical approach is the same, with two state variables and a climatic parameter, and such simple structure remained robust enough to describe soil organic C dynamics over six decades. We tested including an inert soil C pool in the model structure, but it did not decrease the observed variance. Similarly, an intercept in the functions for estimating belowground C input from crop yield was not useful. Results suggest that root C contributes more to the old organic C pool than aboveground C inputs. We also evaluated parameters interactions, in particular between C inputs and their transformation into more stable soil C interacted and decomposition kinetics. We also describe new functions for estimating the ICBM climatic parameter in a more user-friendly way.

By the author/editor: Menichetti, Lore ...; Kätterer, Thomas; Bolinder, Martin

About the subject

AGRICULTURAL SCIENCES: AGRICULTURAL SCI ...; and Other Agricultur ...; and Environmental Sc ...

AGRICULTURAL SCIENCES: AGRICULTURAL SCI ...; and Agriculture Fore ...; and Soil Science

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