Warming response of peatland CO2 sink is sensitive to seasonality in warming trends

Helbig, Manuel; Živković, T.; Alekseychik, Pavel; Aurela, Mika; El-Madany, Tarek S.; Euskirchen, Eugénie; Flanagan, Lawrence B.; Griffis, T. J.; Hanson, Paul J.; Hattakka, J.; Helfter, Carole; Hirano, Takashi; Humphreys, Elyn; Kiely, Gérard; Kolka, Randall K.; Laurila, Tuomas; Lohila, Annalea; Mammarella, Ivan; Nilsson, Mats; Панов, А. В.; Parmentier, Frans‐Jan W.; Peichl, Matthias; Rinne, Janne; Roman, Daniel T.; Sonnentag, Oliver; Tuittila, Eeva‐Stiina; Ueyama, Masahito; Vesala, Timo; Vestin, Patrik; Weldon, Simon; Weslien, Per; Zaehle, Sönke

doi:10.1038/s41558-022-01428-z

Cited by 35 publications

(18 citation statements)

References 68 publications

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“…Future high-resolution studies are needed to test the generality of the responses detected here and their importance for peatland net CO 2 exchanges over time. Nevertheless, our findings are supported by recent findings on peatland net CO 2 exchanges from multiannual monitoring (Helbig et al, 2022), thus providing confidence in the mechanisms found here. Furthermore, we observed similar relationships between metabolic plasticity and GEP across five different species from different origins, suggesting that the relationship between the Sphagnum metabolite composition and GEP is consistent throughout the Sphagnum genus.…”

Section: Discussionsupporting

confidence: 91%

Linkages between Sphagnum metabolites and peatland CO₂ uptake are sensitive to seasonality in warming trends

et al. 2022

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Section: Discussionsupporting

confidence: 91%

Linkages between Sphagnum metabolites and peatland CO₂ uptake are sensitive to seasonality in warming trends

et al. 2022

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“…The lower sensitivity of jack pine to WT drawdown compared to other tree species and low relative cover in the flux footprint compared to open peatland suggests that it is likely that the large interannual variability in GPP we have observed is due to more than a tree drought stress response. While a seasonal dependence of CO 2 exchange sensitivity to WT has been demonstrated using multi‐annual data from 20 northern peatlands (Helbig et al., 2022), the nature of the response to WT may be threshold‐like, where sensitivity can differ between GPP and ER (e.g., Peichl et al., 2014). The response of ER and GPP to WTD between growing seasons at our study site follows the same pattern as the relationship for bogs (Sulman et al., 2010), where WTD in fens was shown to have the opposite effect compared to bogs due to substantially higher shrub and sedge biomass in the fens.…”

Section: Discussionmentioning

confidence: 99%

Reduced Net CO₂ Uptake During Dry Summers in a Boreal Shield Peatland

et al. 2023

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Northern peatlands are globally important ecosystems for long-term carbon storage (Blodau et al., 2004;Clymo, 1987), and have exerted a global climate cooling effect over millennia (Frolking et al., 2006). While only covering ∼3% of the global land area, peatlands store approximately one third of the global organic soil carbon pool (Gorham, 1991;Xu et al., 2018;Yu et al., 2010). This long-term accumulation of peat is generally facilitated by a water table (WT) level near the peatland surface, which limits peat decomposition rates (Benscoter et al., 2005;Clymo, 1984) and maintains high photosynthetic capacity for the key peat-forming Sphagnum mosses (

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“…The northern high latitudes (NHL, > 50°N) are experiencing dramatic changes in carbon cycling, evidenced by an increase in the annual terrestrial net CO 2 uptake and in the amplitude of the seasonal cycles of atmospheric CO 2 over the past five decades 1 – 3 , but the mechanisms underlying these changes remain highly uncertain. Net CO 2 uptake results from the imbalance between the much larger gross fluxes of plant photosynthesis and ecosystem respiration, which have asynchronous responses to seasonal climatic and environmental change 4 – 6 . For example, increased plant photosynthetic CO 2 fixation during the growing season 7 , 8 may be offset by enhanced respiratory CO 2 release in the fall and/or winter 9 , 10 .…”

Section: Introductionmentioning

confidence: 99%

Respiratory loss during late-growing season determines the net carbon dioxide sink in northern permafrost regions

et al. 2022

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Warming of northern high latitude regions (NHL, > 50 °N) has increased both photosynthesis and respiration which results in considerable uncertainty regarding the net carbon dioxide (CO2) balance of NHL ecosystems. Using estimates constrained from atmospheric observations from 1980 to 2017, we find that the increasing trends of net CO2 uptake in the early-growing season are of similar magnitude across the tree cover gradient in the NHL. However, the trend of respiratory CO2 loss during late-growing season increases significantly with increasing tree cover, offsetting a larger fraction of photosynthetic CO2 uptake, and thus resulting in a slower rate of increasing annual net CO2 uptake in areas with higher tree cover, especially in central and southern boreal forest regions. The magnitude of this seasonal compensation effect explains the difference in net CO2 uptake trends along the NHL vegetation- permafrost gradient. Such seasonal compensation dynamics are not captured by dynamic global vegetation models, which simulate weaker respiration control on carbon exchange during the late-growing season, and thus calls into question projections of increasing net CO2 uptake as high latitude ecosystems respond to warming climate conditions.

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Warming response of peatland CO2 sink is sensitive to seasonality in warming trends

Cited by 35 publications

References 68 publications

Linkages between Sphagnum metabolites and peatland CO₂ uptake are sensitive to seasonality in warming trends

Linkages between Sphagnum metabolites and peatland CO₂ uptake are sensitive to seasonality in warming trends

Reduced Net CO₂ Uptake During Dry Summers in a Boreal Shield Peatland

Respiratory loss during late-growing season determines the net carbon dioxide sink in northern permafrost regions

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Warming response of peatland CO2 sink is sensitive to seasonality in warming trends

Cited by 35 publications

References 68 publications

Linkages between Sphagnum metabolites and peatland CO2 uptake are sensitive to seasonality in warming trends

Linkages between Sphagnum metabolites and peatland CO2 uptake are sensitive to seasonality in warming trends

Reduced Net CO2 Uptake During Dry Summers in a Boreal Shield Peatland

Respiratory loss during late-growing season determines the net carbon dioxide sink in northern permafrost regions

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Product

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Linkages between Sphagnum metabolites and peatland CO₂ uptake are sensitive to seasonality in warming trends

Linkages between Sphagnum metabolites and peatland CO₂ uptake are sensitive to seasonality in warming trends

Reduced Net CO₂ Uptake During Dry Summers in a Boreal Shield Peatland