Towards better assessments of nutrient constraints on soil carbon sequestration: including soil microbial and mineral mechanisms into the terrestrial biosphere models

Project Details

Description

Soils contain the largest carbon (C) pool in terrestrial ecosystems, and the capacity of soils to sequestrate C is thus important for climate mitigation. However, model uncertainties caused by inadequate process descriptions of carbon-nutrient interactions lead to high uncertainties in the future projections of terrestrial C sequestration. The aim of this project is to include soil microbial and mineral mechanisms into a terrestrial biosphere model (TBM), to improve the assessments of nutrient constraints on soil C sequestration. A combined approach of process-based modelling and soil measurements from four forest sites will be used in two sub-studies:
(1) improving the representations of carbon-nutrient interactions of a soil C model, which already contains microbial and mineral mechanisms, to be able to quantify the effects of microbial mechanisms on soil organic matter formation/turnover and
(2) coupling this soil C model with a TBM to investigate the nutrient constraints on soil C sequestration, and applying the improved TBM on 544 forest sites in a national database to investigate the effects of nutrient constraints on soil C sequestration across Sweden. The improved model will be capable of better predicting the effects of management strategies on C sequestration, to provide more robust decision support

This project is financed by the Strategic Research Area BECC.
StatusActive
Effective start/end date2020/04/192022/04/30