2025-07-25 中国科学院（CAS）
Spatial pattern of global wetland carbon sequestration (Image by LI Junjie)
＜関連情報＞
- https://english.cas.cn/newsroom/research_news/earth/202507/t20250723_1048448.shtml
- https://www.nature.com/articles/s41559-025-02809-1
北半球の中高緯度地域における湿地における二酸化炭素吸収量の20年間にわたる増加は、熱帯地域と南半球における減少によって相殺されています Two decades of improved wetland carbon sequestration in northern mid-to-high latitudes are offset by tropical and southern declines
Junjie Li,Junji Yuan,Philippe Ciais,Hojeong Kang,Chris Freeman,Yuanyuan Huang,Yanhong Dong,Deyan Liu,Ye Li & Weixin Ding
Nature Ecology Evolution Published:22 July 2025
DOI:https://doi.org/10.1038/s41559-025-02809-1
Abstract
Terrestrial carbon (C) sink has long been recognized as trending upwards, yet its recent slowdown raises concerns about accelerating climate change. Variations in wetland C sequestration are hypothesized to play a key role in this shift. Here we mapped annual water levels in global wetlands from 2000 to 2020 using 2,295 field-based measurements and predicted the spatiotemporal pattern of wetland net ecosystem production (NEP) in conjunction with other environmental factors. By compiling 934 in situ observations, we estimated a global mean wetland NEP of 56.4 (44.0‒68.8) gC m−2 yr−1. Integrating the NEP dataset with environmental datasets and machine-learning models, we estimated the mean annual global wetland C sequestration between 2000 and 2020 to be 1,004 (961‒1,047) TgC, 70% of which originated from tropical wetlands. We observed a decline in global wetland C sinks until 2005, followed by an increase thereafter. Overall, wetland C sequestration was roughly stable during 2000‒2020, as gains in northern mid-to-high latitudes were fully overwhelmed by declines in the tropics and southern mid-to-high latitudes. Our findings highlight hydrological change as a dominant driver of increasing regional variability in wetland C sinks, while intensifying hydrological extremes under climate change may undermine the resilience of wetland C sinks and the ecosystem services they support.
