Intact and managed peatland soils as a source and sink of GHGs from 1850 to 2100

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Abstract

Land-use change disturbs the function of peatland as a natural carbon sink and triggers high GHG emissions1. Nevertheless, historical trends and future trajectories of GHG budgets from soil do not explicitly include peatlands2,3. Here, we provide an estimate of the past and future role of global peatlands as either a source or sink of GHGs based on scenario timelines of land conversion. Between 1850 and 2015, temperate and boreal regions lost 26.7 million ha, and tropical regions 24.7 million ha, of natural peatland. By 2100, peatland conversion in tropical regions might increase to 36.3 million ha. Cumulative emissions from drained sites reached 80 ± 20 PgCO2e in 2015 and will add up to 249 ± 38 Pg by 2100. At the same time, the number of intact sites accumulating peat will decline. In 1960 the global peatland biome turned from a net sink into a net source of soil-derived GHGs. Annual back-conversion of most of the drained area would render peatlands GHG neutral, whereas emissions from peatland may comprise 12–41% of the GHG emission budget for keeping global warming below +1.5 to +2 °C without rehabilitation.

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Fig. 1: Annual GHG fluxes from biological peat oxidation and peat formation from drained and intact organic soils 1850–2100 without and including peatland rehabilitation.
Fig. 2: Percentage of global CO2 budget required to maintain air temperature <1.5–2.0 °C consumed by drained peatlands 2020–2100 for a budget range of 400–1,600 PgCO2e.

Data availability

All figure source data files are available at https://issues.pangaea.de/browse/PDI-21686.

Code availability

The numerical codes for the Monte Carlo simulations that support the findings of this study are available from the corresponding author on reasonable request.

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Author information

J.L. designed the study and prepared the manuscript with contributions from C.W.-G. and S.P.

Correspondence to Jens Leifeld.

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The authors declare no competing interests.

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Peer review information Nature Climate Change thanks Kuno Kasak and Debjani Sihi for their contribution to the peer review of this work.

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Supplementary Information

Supplementary Figs. 1–8 and Table 1.

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Leifeld, J., Wüst-Galley, C. & Page, S. Intact and managed peatland soils as a source and sink of GHGs from 1850 to 2100. Nat. Clim. Chang. 9, 945–947 (2019) doi:10.1038/s41558-019-0615-5

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