Phosphorus supply affects long-term carbon accumulation in mid-latitude ombrotrophic peatlands

Schillereff, Daniel; Chiverrell, Richard; Sjöström, Jenny K.; Kylander, Malin E.; Boyle, John; Davies, Jessica; Toberman, Hannah; Tipping, Edward

doi:10.31223/x5fw3j

2022

DOI: 10.31223/x5fw3j

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Phosphorus supply affects long-term carbon accumulation in mid-latitude ombrotrophic peatlands

Daniel Schillereff¹,

Richard Chiverrell²,

Jenny K. Sjöström³

et al.

Abstract: is a pre-print and has not been peer-reviewed. It has been submitted to a peer-reviewed journal but we are sharing this version on EarthArXiv in the interests of open research, non-commercial publishing and timely dissemination, recognising that peer review can be a protracted process (especially during the COVID-19 pandemic). Subsequent versions of this manuscript may differ due to the editorial and review process. Should it be accepted, a link to the publisher's version will be available via the 'Peer-review… Show more

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Carbon accumulation rates of Holocene peatlands in central–eastern Europe document the driving role of human impact over the past 4000 years

et al. 2021

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Abstract. Peatlands are one of the largest terrestrial carbon sinks on the planet, yet little is known about the carbon accumulation rates (CARs) of mountainous peatlands. The long-term variability in the size of the associated carbon sink and its drivers remain largely unconstrained, especially when the long-term anthropogenic impact is also considered. Here, we present a composite CAR record of nine peatlands from central–eastern Europe (Romania and Serbia) detailing variability in the rates of carbon accumulation during the Holocene. We show examples of extremely high long-term rates of carbon accumulation (LORCA>120 gCm-2yr-1), indicating that mountain peatlands constitute an efficient regional carbon sink at times. By comparing our data to modelled palaeoclimatic indices and to measures of anthropogenic impact we disentangle the drivers of peat carbon accumulation in the area. Variability in early- and mid-Holocene CARs is linked to hydroclimatic controls, with high CARs occurring during the early Holocene and lower CARs associated with the transition to cooler and moister mid-Holocene conditions. By contrast, after 4000 years (calibrated) before present (years BP), the trends in CARs indicate a divergence from hydroclimate proxies, suggesting that other processes became the dominant drivers of peat CARs. We propose that enhanced erosion following tree cover reduction as well as increased rates of long-distance atmospheric dust fallout might have played a role, as both processes would result in enhanced mineral and nutrient supply to bog surfaces, stimulating peatland productivity. Surprisingly though, for the last 1000 years, reconstructed temperature is significantly correlated with CARs, with rising temperatures linked to higher CARs. Under future climate conditions, which are predicted to be warmer in the region, we predict that peat growth may expand but that this is entirely dependent upon the scale of human impact directly affecting the sensitive hydrological budget of these peatlands.

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Carbon accumulation rates of Holocene peatlands in central–eastern Europe document the driving role of human impact over the past 4000 years

et al. 2021

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Phosphorus supply affects long-term carbon accumulation in mid-latitude ombrotrophic peatlands

Cited by 1 publication

References 68 publications

Carbon accumulation rates of Holocene peatlands in central–eastern Europe document the driving role of human impact over the past 4000 years

Carbon accumulation rates of Holocene peatlands in central–eastern Europe document the driving role of human impact over the past 4000 years

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