アマゾン森林で嵐と乾燥化がバイオマス循環を加速することを確認 （Storms, Dryness Speeding up Biomass Turnover in Amazon Forest: Study）

2026-05-25 中国科学院（CAS）

＜関連情報＞

• https://english.cas.cn/newsroom/cas-in-media/202605/t20260525_1159866.shtml
• https://www.nature.com/articles/s41558-026-02639-4

大気の乾燥化と嵐の増加は、アマゾンの森林におけるバイオマスの循環を加速させる Increasing atmospheric dryness and storms accelerates biomass turnover in Amazonian forests

Donghai Wu,Yongshi Zhou,Yanlei Feng,Evan M. Gora,Marcos Longo,Robinson I. Negrón-Juárez,Sassan S. Saatchi,Yanlan Liu,Yixin Ma,Douglas C. Morton,Nate G. McDowell,Yiqi Luo & Xiangtao Xu
Nature Climate Change  Published:13 May 2026
DOI:https://doi.org/10.1038/s41558-026-02639-4

Abstract

Tropical forest resilience to climate change depends on the rate of vegetation biomass turnover, a key determinant of forest biomass storage potential. However, the large-scale patterns of tropical biomass turnover and their environmental drivers remain poorly understood. Here we estimate kilometre-scale aboveground biomass turnover time (τ_AGB) across intact Amazonian forests by integrating satellite and field measurements. Our spatial analysis provides continent-scale evidence that τ_AGB exhibits strong nonlinear responses to climate. Convective storms, a common cause of tropical forest disturbances, are a major climatic driver of τ_AGB spatial variation, surpassing vapour pressure deficit and precipitation extremes. By the end of this century, projected increases in atmospheric dryness and storm activities are expected to reduce τ_AGB in the Amazon by ~3% (shared socioeconomic pathway SSP 126) to ~15% (SSP 585), thereby accelerating biomass turnover. These findings highlight that climatic sensitivities of biomass turnover critically shape tropical forest dynamics and carbon cycling.