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Input-driven versus turnover-driven controls of simulated changes in soil carbon from land-use change

MPS-Authors
/persons/resource/persons198789

Nyawira,  Sarah-Sylvia
Emmy Noether Junior Research Group Forest Management in the Earth System, The Land in the Earth System, MPI for Meteorology, Max Planck Society;
IMPRS on Earth System Modelling, MPI for Meteorology, Max Planck Society;

/persons/resource/persons180452

Nabel,  Julia E. M. S.
Emmy Noether Junior Research Group Forest Management in the Earth System, The Land in the Earth System, MPI for Meteorology, Max Planck Society;
B 2 - Land Use and Land Cover Change, Research Area B: Climate Manifestations and Impacts, The CliSAP Cluster of Excellence, External Organizations;

/persons/resource/persons37113

Brovkin,  Victor
Climate-Biogeosphere Interaction, The Land in the Earth System, MPI for Meteorology, Max Planck Society;
B 2 - Land Use and Land Cover Change, Research Area B: Climate Manifestations and Impacts, The CliSAP Cluster of Excellence, External Organizations;

/persons/resource/persons37296

Pongratz,  Julia
Emmy Noether Junior Research Group Forest Management in the Earth System, The Land in the Earth System, MPI for Meteorology, Max Planck Society;
B 2 - Land Use and Land Cover Change, Research Area B: Climate Manifestations and Impacts, The CliSAP Cluster of Excellence, External Organizations;

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Supplementary Material (public)

ERL_12_8_084015_suppdata.pdf
(Supplementary material), 5MB

2017_ERL_paper_Sylvia_Nyawira.tar.gz
(Supplementary material), 13MB

Citation

Nyawira, S.-S., Nabel, J. E. M. S., Brovkin, V., & Pongratz, J. (2017). Input-driven versus turnover-driven controls of simulated changes in soil carbon from land-use change. Environmental Research Letters, 12(8): 084015. doi:10.1088/1748-9326/aa7ca9.


Cite as: http://hdl.handle.net/11858/00-001M-0000-002D-CD6E-D
Abstract
Historical changes in soil carbon associated with land-use change (LUC) result mainly from the changes in the quantity of litter inputs to the soil and the turnover of carbon in soils. We use a factor separation technique to assess how the input-driven and turnover-driven controls, as well as their synergies, have contributed to historical changes in soil carbon associated with LUC. We apply this approach to equilibrium simulations of present-day and pre-industrial land use performed using the dynamic global vegetation model JSBACH. Our results show that both the input-driven and turnover-driven changes generally contribute to a gain in soil carbon in afforested regions and a loss in deforested regions. However, in regions where grasslands have been converted to croplands, we find an input-driven loss that is partly offset by a turnover-driven gain, which stems from a decrease in the fire-related carbon losses. Omitting land management through crop and wood harvest substantially reduces the global losses through the input-driven changes. Our study thus suggests that the dominating control of soil carbon losses is via the input-driven changes, which are more directly accessible to human management than the turnover-driven ones.