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Cross-biome synthesis of source versus sink limits to tree growth

Citation

Cabon, Antoine et al. (2022), Cross-biome synthesis of source versus sink limits to tree growth, Dryad, Dataset, https://doi.org/10.5061/dryad.15dv41nzt

Abstract

Uncertainties surrounding tree carbon allocation to growth are a major limitation to projections of forest carbon sequestration and response to climate change. The prevalence and extent to which carbon assimilation (source) or cambial activity (sink) mediate wood production are fundamentally important and remain elusive. We quantified source-sink relations across biomes by combining eddy-covariance gross primary production with extensive on-site and regional tree ring observations. We found widespread temporal decoupling between carbon assimilation and tree growth, underpinned by contrasting climatic sensitivities of these two processes. Substantial differences in assimilation-growth decoupling between angiosperms and gymnosperms were determined, as well as stronger decoupling with canopy closure, aridity, and decreasing temperatures. Our results reveal pervasive sink control over tree growth that is likely to be increasingly prominent under global climate change.

Funding

National Institute of Food and Agriculture, Award: 2018-67019-27850

David and Lucille Packard Foundation and US National Science Foundation, Award: 1714972

National Science Foundation, Award: 1753845

U.S. Forest Service, Award: 19-05

U.S. Department of Energy, Award: DE-SC0022052

Arctic Challenge for Sustainability II, Award: JPMXD1420318865

National Institute of Food and Agriculture, Award: 2017‐67013‐26191

U.S. Department of Energy, Award: AmeriFlux

U.S. Department of Energy, Award: DE-SC0010611

NSF Directorate for Biological Sciences, Award: 1241851