Tree carbon allocation explains forest drought-kill and recovery patterns

A. T. Trugman, M. Detto, M. K. Bartlett, D. Medvigy, W. R.L. Anderegg, Christopher R Schwalm, B. Schaffer, S. W. Pacala

Research output: Contribution to journalLetter

48 Scopus citations

Abstract

The mechanisms governing tree drought mortality and recovery remain a subject of inquiry and active debate given their role in the terrestrial carbon cycle and their concomitant impact on climate change. Counter-intuitively, many trees do not die during the drought itself. Indeed, observations globally have documented that trees often grow for several years after drought before mortality. A combination of meta-analysis and tree physiological models demonstrate that optimal carbon allocation after drought explains observed patterns of delayed tree mortality and provides a predictive recovery framework. Specifically, post-drought, trees attempt to repair water transport tissue and achieve positive carbon balance through regrowing drought-damaged xylem. Furthermore, the number of years of xylem regrowth required to recover function increases with tree size, explaining why drought mortality increases with size. These results indicate that tree resilience to drought-kill may increase in the future, provided that CO2 fertilisation facilitates more rapid xylem regrowth.

Original languageEnglish (US)
Pages (from-to)1552-1560
Number of pages9
JournalEcology Letters
Volume21
Issue number10
DOIs
StatePublished - Oct 1 2018

Keywords

  • Carbon metabolism
  • CO fertilisation
  • drought
  • hydraulic-carbon coupling
  • lagged mortality
  • optimality theory
  • plant hydraulics
  • stem respiration
  • vegetation model
  • xylem damage

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics

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  • Cite this

    Trugman, A. T., Detto, M., Bartlett, M. K., Medvigy, D., Anderegg, W. R. L., Schwalm, C. R., Schaffer, B., & Pacala, S. W. (2018). Tree carbon allocation explains forest drought-kill and recovery patterns. Ecology Letters, 21(10), 1552-1560. https://doi.org/10.1111/ele.13136