Climate change reduces the capacity of northern peatlands to absorb the atmospheric carbon dioxide: The different responses of bogs and fens

摘要: The carbon (C) storage of northern peatlands is equivalent to ~34–46% the ~795 T g C currently held in atmosphere as CO2. Most studies report that are a sink between 20 and 60 g CO2–C m−2 yr−1. Since peatland hydrology biogeochemistry very closely related climate, there concern whether will continue function sinks with climate change. We used coupled land surface scheme model, called CLASS3W-MWM, examine sensitivity Based on data available constrain our we simulated dynamics Mer Bleue (MB) bog eastern Canada Degero Stormyr (DS) poor fen Sweden for four Intergovernmental Panel Climate Change (IPCC) change scenarios, i.e., A1B, A2, B1, Commit, over time periods, present day, 2030, 2060, 2100. When future fluxes were compared baseline under conditions, found fens much more sensitive than bogs. Gross primary production (GPP) at MB significantly increased by 4–44% up 2100 all scenarios except Commit. GPP DS decreased 34–39% A1B slightly 6–10% B1 Total ecosystem respiration (TER) 7–57% 4–34% Net (NEP), therefore, decreased. bog, however, was still 2100, though reduced, but switched source A2 scenarios. Additional experiments where climatically transplanted study or forced vegetation changes when became too dry showed similar less dramatic results standard runs. Our indicate should be included C-coupled model fully understand response cycling terrestrial ecosystems reduce uncertainties projecting climate.