Ghosts of the past: how drought legacy effects shape forest functioning and carbon cycling

Ecology Letters
Steven A KannenbergW R L Anderegg

Abstract

Multi-year lags in tree drought recovery, termed 'drought legacy effects', are important for understanding the impacts of drought on forest ecosystems, including carbon (C) cycle feedbacks to climate change. Despite the ubiquity of lags in drought recovery, large uncertainties remain regarding the mechanistic basis of legacy effects and their importance for the C cycle. In this review, we identify the approaches used to study legacy effects, from tree rings to whole forests. We then discuss key knowledge gaps pertaining to the causes of legacy effects, and how the various mechanisms that may contribute these lags in drought recovery could have contrasting implications for the C cycle. Furthermore, we conduct a novel data synthesis and find that legacy effects differ drastically in both size and length across the US depending on if they are identified in tree rings versus gross primary productivity. Finally, we highlight promising approaches for future research to improve our capacity to model legacy effects and predict their impact on forest health. We emphasise that a holistic view of legacy effects - from tissues to whole forests - will advance our understanding of legacy effects and stimulate efforts to investigate drought r...Continue Reading

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Citations

Oct 16, 2020·The Science of the Total Environment·Chencheng ZhangMing'an Shao
Jan 27, 2021·The New Phytologist·Mingkai JiangBelinda E Medlyn
Apr 7, 2021·Tree Physiology·Kiyomi MorinoMalcolm K Hughes
Sep 14, 2021·Frontiers in Plant Science·Cristina ValerianoJ Julio Camarero

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