Global variation in vegetation carbon use efficiency inferred from eddy covariance observations.

ABSTRACT: Terrestrial ecosystems have been serving as a strong carbon sink that offsets one-quarter of anthropogenic CO₂ emissions. Carbon use efficiency (CUE), the percentage of photosynthesized carbon that is available for biomass production and other secondary carbon products, is one factor determining the carbon sink size. The global variation in CUE remains unclear, however, as recent reports disagree over the responses of CUE to temperature, dryness, forest types and stand age, and there are limited direct observations to constrain the related uncertainty. Here, we propose to infer CUE from spatially distributed observations of land-atmosphere CO₂ exchange from global eddy covariance sites based on the degree of ecosystem respiration-photosynthesis coupling. Across 2,737

SUBMITTER: Luo X 

PROVIDER: S-EPMC12328238 | biostudies-literature | 2025 Aug

REPOSITORIES: biostudies-literature