Leaf development and demography explain photosynthetic seasonality in Amazon evergreen forests

Science
Jin WuScott R Saleska

Abstract

In evergreen tropical forests, the extent, magnitude, and controls on photosynthetic seasonality are poorly resolved and inadequately represented in Earth system models. Combining camera observations with ecosystem carbon dioxide fluxes at forests across rainfall gradients in Amazônia, we show that aggregate canopy phenology, not seasonality of climate drivers, is the primary cause of photosynthetic seasonality in these forests. Specifically, synchronization of new leaf growth with dry season litterfall shifts canopy composition toward younger, more light-use efficient leaves, explaining large seasonal increases (~27%) in ecosystem photosynthesis. Coordinated leaf development and demography thus reconcile seemingly disparate observations at different scales and indicate that accounting for leaf-level phenology is critical for accurately simulating ecosystem-scale responses to climate change.

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Citations

Mar 18, 2016·Nature·Scott R SaleskaNatalia Restrepo-Coupe
Nov 29, 2016·The New Phytologist·Alistair RogersSönke Zaehle
Jul 15, 2017·PloS One·Fabien Hubert WagnerLuiz E O C Aragão
May 4, 2018·Global Change Biology·Victor Alexandre Hardt Ferreira Dos SantosScott Reid Saleska
May 26, 2016·American Journal of Botany·Erika J EdwardsMichael J Donoghue
Feb 17, 2018·The New Phytologist·Nate McDowellXiangtao Xu
Nov 15, 2018·Plant Biology·L A Cernusak
Jul 6, 2019·Global Change Biology·Kun Huang, Jianyang Xia
Jul 26, 2019·Global Change Biology·Loren P AlbertScott R Saleska
Jun 20, 2019·The New Phytologist·Maurizio MencucciniJordi Martínez-Vilalta
Dec 25, 2019·Ecological Applications : a Publication of the Ecological Society of America·Alexey N ShiklomanovMichael C Dietze
Sep 5, 2019·Global Change Biology·Jin WuAlistair Rogers
Jul 13, 2020·Global Change Biology·Chongya JiangTrevor F Keenan
May 31, 2020·The New Phytologist·Matteo Detto, Xiangtao Xu
Aug 31, 2019·American Journal of Botany·James R KellnerK C Cushman
Oct 16, 2019·Proceedings of the National Academy of Sciences of the United States of America·Russell DoughtyBerrien Moore
Feb 23, 2017·Proceedings of the National Academy of Sciences of the United States of America·Hao Tang, Ralph Dubayah

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