Leveraging Uncertainty in Terrestrial Ecosystem Carbon Stocks and Fluxes

Trugman, Anna T.; Quetin, Gregory R.

doi:10.1029/2022ef003322

Earth's Future

2023

DOI: 10.1029/2022ef003322

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Leveraging Uncertainty in Terrestrial Ecosystem Carbon Stocks and Fluxes

Anna T. Trugman

Gregory R. Quetin

Abstract: Forest health and C storage potential is evolving rapidly due to anthropogenic climate change and human land use activities (Le Quéré et al., 2018). Accelerating losses from forest mortality due to wildfires, increasing drought, and human harvesting have the potential to drastically decrease forest C storage by increasing C fluxes from terrestrial ecosystems to the atmosphere (

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2024

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Source vs sink limitations on tree growth: from physiological mechanisms to evolutionary constraints and terrestrial carbon cycle implications

Trugman,

Anderegg

2024

New Phytologist

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SummaryThe potential for widespread sink‐limited plant growth has received increasing attention in the literature in the past few years. Despite recent evidence for sink limitations to plant growth, there are reasons to be cautious about a sink‐limited world view. First, source‐limited vegetation models do a reasonable job at capturing geographic patterns in plant productivity and responses to resource limitations. Second, from an evolutionary perspective, it is nonadaptive for plants to invest in increasing carbon assimilation if growth is primarily sink‐limited. In this review, we synthesize the potential evidence for and underlying physiology of sink limitation across terrestrial ecosystems and contrast mechanisms of sink limitation with those of source‐limited productivity. We highlight evolutionary restrictions on the magnitude of sink limitation at the organismal level. We also detail where mechanisms regulating sink limitation at the organismal and ecosystem scale (e.g. the terrestrial carbon sink) diverge. Although we find that there is currently no direct evidence for widespread organismal sink limitation, we propose a series of follow‐up growth chamber manipulations, systematized measurements, and modeling experiments targeted at diagnosing nonadaptive buildup of excess nonstructural carbohydrates that will help illuminate the prevalence and magnitude of organismal sink limitation.

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Source vs sink limitations on tree growth: from physiological mechanisms to evolutionary constraints and terrestrial carbon cycle implications

Trugman,

Anderegg

2024

New Phytologist

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Leveraging Uncertainty in Terrestrial Ecosystem Carbon Stocks and Fluxes

Cited by 1 publication

References 38 publications

Source vs sink limitations on tree growth: from physiological mechanisms to evolutionary constraints and terrestrial carbon cycle implications

Source vs sink limitations on tree growth: from physiological mechanisms to evolutionary constraints and terrestrial carbon cycle implications

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