2026-05-28 日本原子力研究開発機構,京都大学,パランカラヤ大学,北海道大学
図1 熱帯泥炭地の撹乱により「古代の炭素」が連鎖的に排出されることを定量的に解明
（炭素排出量［kg-C/m2］は排水開始から18年間の総量を表す）
＜関連情報＞
熱帯泥炭地の撹乱による長期蓄積炭素の段階的な放出 Progressive release of long-stored carbon from tropical peatland disturbances
Jun Koarashi,Masayuki Itoh,Mariko Atarashi-Andoh,Yoko Saito-Kokubu,Makoto Matsueda,Kitso Kusin,Adi Jaya,Salampak Dohong & Takashi Hirano
Nature Communications Published:27 May 2026
DOI:https://doi.org/10.1038/s41467-026-72890-y
Abstract
Tropical peatlands are globally important, millennia-old carbon sinks, yet unprecedented human-driven degradation is triggering alarming carbon emissions. Comprehensive quantification of carbon dynamics across the disturbance sequence—from peat swamp forests to drained and fire-impacted peatlands—remains a critical knowledge gap. Here we show that over 18 years (1996–2014), drainage and subsequent peat fires released approximately 30–41 kg C m−2 from peatlands in Central Kalimantan, Indonesia, using radiocarbon dating of peat profiles and groundwater dissolved organic carbon. Drainage contributed 5–11 kg C m−2, primarily from centuries- to millennium-old, previously waterlogged peat. Fires released 23–32 kg C m−2 from peat accumulated over the past 3,000 years, initiating progressive oxidative decomposition of older peat. Extrapolation to Indonesia’s disturbed peatlands suggests a release of 0.81–3.70 Gt C between 1996 and 2014, with ongoing decomposition releasing an additional 0.03–0.08 Gt C annually, accelerating the impact on the global carbon balance.
