泥炭(成煤)沼泽古野火记录及碳循环效应OA

[Significance]Peat bogs play an important role in the global carbon cycle as a depositional carrier of paleo-wildfire events and paleoclimate information.By systematically sorting wildfires types in peat bogs and clarify-ing the academic terminology related to wildfire products such as charcoal,the carbon source and sink effects of wild-fires in peat bogs were discussed.This information is useful for the study of the carbon cycle in deep time.[Progress]Wildfire product charcoal,approximately equivalent to the inertinite in coal,is a relatively stable carbon store of plant-incomplete combustion residues,which can provide a record of wildfire activities in geological history,from millennia to billions of years.Changes in charcoal material composition(e.g.,polysaccharides and lignin)and micro-structure(e.g.,cell wall homogenization)can reflect the temperature range of paleo-wildfires.Wildfire types can be recovered and atmospheric oxygen content can be constrained using inertinite reflectance and content.The impacts of wildfires on the global carbon cycle include both short-term carbon source and long-term carbon sink effects.Wild-fires lead to direct large carbon emissions and carbon release from deep peat burning.However,wildfire-driven per-sistent changes in soil microorganisms,aggregates,and organic matter can directly offset certain carbon losses,and charcoal provides a stable carbon store.[Conclusions and Prospects]Based on the carbon cycle model of peatland under normal burial conditions,the influence factors of wildfire,soil aggregates,fungi,and bacteria were introduced to propose a post-fire peatland carbon cycle model.Using the inertinite wildfire genesis and greenhouse gas emission models,and taking the carbon emission and carbon storage of wildfires in Early Cretaceous peat(coal-forming)bogs in Northeast China as an example,the results show that the long-term(million-year time scale)carbon sinks of forest vegetation growth and peatland are fully capable of neutralizing the short-term(year time scale)carbon source effect brought by wildfires.In the future,when evaluating the deep-time carbon cycle response to wildfires,it is necessary to consider the length of the time period and wildfire intensity,improving our understanding of climate change and en-vironmental evolution caused by wildfire to promote the in-depth integration of deep-time and present-day climate change and carbon cycle research.