Pervasive decreases in living vegetation carbon turnover time across forest climate zones

Kailiang Yu, William K. Smith, Anna T. Trugman, Richard Condit, Stephen P. Hubbell, Jordi Sardans, Changhui Peng, Kai Zhu, Josep Peñuelas, Maxime Cailleret, Tom Levanic, Arthur Gessler, Marcus Schaub, Marco Ferretti, William R.L. Anderegg

Research output: Contribution to journalArticlepeer-review

28 Scopus citations

Abstract

Forests play a major role in the global carbon cycle. Previous studies on the capacity of forests to sequester atmospheric CO2 have mostly focused on carbon uptake, but the roles of carbon turnover time and its spatiotemporal changes remain poorly understood. Here, we used long-term inventory data (1955 to 2018) from 695 mature forest plots to quantify temporal trends in living vegetation carbon turnover time across tropical, temperate, and cold climate zones, and compared plot data to 8 Earth system models (ESMs). Long-term plots consistently showed decreases in living vegetation carbon turnover time, likely driven by increased tree mortality across all major climate zones. Changes in living vegetation carbon turnover time were negatively correlated with CO2 enrichment in both forest plot data and ESM simulations. However, plot-based correlations between living vegetation carbon turnover time and climate drivers such as precipitation and temperature diverged from those of ESM simulations. Our analyses suggest that forest carbon sinks are likely to be constrained by a decrease in living vegetation carbon turnover time, and accurate projections of forest carbon sink dynamics will require an improved representation of tree mortality processes and their sensitivity to climate in ESMs.

Original languageEnglish (US)
Pages (from-to)24662-24667
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume116
Issue number49
DOIs
StatePublished - 2019

Keywords

  • Carbon cycle
  • Forest carbon stocks
  • Forest productivity
  • Tree mortality

ASJC Scopus subject areas

  • General

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