Evidence for strong seasonality in the carbon storage and carbon use efficiency of an Amazonian forest

Lucy Rowland*, Timothy Charles Hill, Clement Stahl, Lukas Siebicke, Benoit Burban, Joana Zaragoza-Castells, Stephane Ponton, Damien Bonal, Patrick Meir, Mathew Williams

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The relative contribution of gross primary production and ecosystem respiration to seasonal changes in the net carbon flux of tropical forests remains poorly quantified by both modelling and field studies. We use data assimilation to combine nine ecological time series from an eastern Amazonian forest, with mass balance constraints from an ecosystem carbon cycle model. The resulting analysis quantifies, with uncertainty estimates, the seasonal changes in the net carbon flux of a tropical rainforest which experiences a pronounced dry season. We show that the carbon accumulation in this forest was four times greater in the dry season than in the wet season and that this was accompanied by a 5% increase in the carbon use efficiency. This seasonal response was caused by a dry season increase in gross primary productivity, in response to radiation and a similar magnitude decrease in heterotrophic respiration, in response to drying soils. The analysis also predicts increased carbon allocation to leaves and wood in the wet season, and greater allocation to fine roots in the dry season. This study demonstrates implementation of seasonal variations in parameters better enables models to simulate observed patterns in data. In particular we highlight the necessity to simulate the seasonal patterns of heterotrophic respiration to accurately simulate the net carbon flux seasonal tropical forest. This article is protected by copyright. All rights reserved.
Original languageEnglish
Pages (from-to)979-991
Number of pages13
JournalGlobal Change Biology
Volume20
Issue number3
Early online date20 Jan 2014
DOIs
Publication statusPublished - 2014

Keywords

  • carbon use efficiency
  • DALEC
  • data assimilation
  • ecosystem respiration
  • French Guiana
  • seasonal carbon fluxes

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