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<p>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 (<i>τ</i><sub>AGB</sub>) across intact Amazonian forests by integrating satellite and field measurements. Our spatial analysis provides continent-scale evidence that <i>τ</i><sub>AGB</sub> exhibits strong nonlinear responses to climate. Convective storms, a common cause of tropical forest disturbances, are a major climatic driver of <i>τ</i><sub>AGB</sub> 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 <i>τ</i><sub>AGB</sub> 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.</p>

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Increasing atmospheric dryness and storms accelerates biomass turnover in Amazonian forests

  • 期刊论文

  • 发表日期：

    2026年5月13日

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  • 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

摘要

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 (τAGB) across intact Amazonian forests by integrating satellite and field measurements. Our spatial analysis provides continent-scale evidence that τAGB exhibits strong nonlinear responses to climate. Convective storms, a common cause of tropical forest disturbances, are a major climatic driver of τAGB 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 τAGB 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.