A drained nutrient‐poor peatland forest in boreal Sweden constitutes a net carbon sink after integrating terrestrial and aquatic fluxes

作者：Cheuk Hei Marcus Tong, Koffi Dodji Noumonvi, Joshua L. Ratcliffe, Hjalmar Laudon, Järvi Järveoja, Andreas Drott, Mats B. Nilsson, Matthias Peichl · 发表于：Global Change Biology · 年份：2024 · DOI：10.1111/gcb.17246 · 被引用次数：18 · 研究领域：Peatlands and Wetlands Ecology、Coastal wetland ecosystem dynamics、Soil and Water Nutrient Dynamics

Abstract Northern peatlands provide a globally important carbon (C) store. Since the beginning of the 20th century, however, large areas of natural peatlands have been drained for biomass production across Fennoscandia. Today, drained peatland forests constitute a common feature of the managed boreal landscape, yet their ecosystem C balance and associated climate impact are not well understood, particularly within the nutrient‐poor boreal region. In this study, we estimated the net ecosystem carbon balance (NECB) from a nutrient‐poor drained peatland forest and an adjacent natural mire in northern Sweden by integrating terrestrial carbon dioxide (CO 2 ) and methane (CH 4 ) fluxes with aquatic losses of dissolved organic C (DOC) and inorganic C based on eddy covariance and stream discharge measurements, respectively, over two hydrological years. Since the forest included a dense spruce‐birch area and a sparse pine area, we were able to further evaluate the effect of contrasting forest structure on the NECB and component fluxes. We found that the drained peatland forest was a net C sink with a 2‐year mean NECB of −115 ± 5 g C m −2 year −1 while the adjacent mire was close to C neutral with 14.6 ± 1.7 g C m −2 year −1 . The NECB of the drained peatland forest was dominated by the net CO 2 exchange (net ecosystem exchange [NEE]), whereas NEE and DOC export fluxes contributed equally to the mire NECB. We further found that the C sink strength in the sparse pine forest area (−153 ±...