Seasonal controls on the exchange of carbon and water in an Amazonian rain forest

Lucy R. Hutyra, J. William Munger, Scott Saleska, Elaine Gottlieb, Bruce C. Daube, Allison L. Dunn, Daniel F. Amaral, Plinio B. de Camargo, Steven C. Wofsy

Research output: Contribution to journalArticle

197 Citations (Scopus)

Abstract

The long-term resilience of Amazonian forests, to climate changes and the fate of their large stores of organic carbon depend on the ecosystem response to climate and weather. This study presents 4 years of eddy covariance data for CO2 and water fluxes in an evergreen, old-growth tropical rain forest examining the forest's response to seasonal variations and to short-term weather anomalies. Photosynthetic efficiency declined late in the wet season, before appreciable leaf litter fall, and increased after new leaf production midway through the dry season. Rates of evapotranspiration were inelastic and did not depend on dry season precipitation. However, ecosystem respiration was inhibited by moisture, limitations on heterotrophic respiration during the dry season. The annual carbon balance for this ecosystem was very close to neutral, with mean net loss of 890 ± 220 kg C ha-1 yr-1, and a range of -221 ± 453 (C uptake) to +2677 ± 488 (C loss) kg C ha-1 yr-1 over 4 years. The trend from large net carbon release in 2002 towards net carbon uptake in 2005 implies recovery from prior disturbance. The annual carbon balance was sensitive to weather anomalies, particularly the timing of the dry-to-wet season transition, reflecting modulation of light inputs and respiration processes. Canopy carbon uptake rates were largely controlled by phenology and light with virtually no indication of seasonal water limitation during the 5-month dry season, indicating ample supplies of plant-available-water and ecosystem adaptation for maximum light utilization.

Original languageEnglish (US)
Article numberG03008
JournalJournal of Geophysical Research: Space Physics
Volume112
Issue number3
DOIs
StatePublished - Sep 28 2007

Fingerprint

rain forests
Rain
dry season
Carbon
Ecosystems
ecosystems
respiration
Water
carbon
carbon balance
weather
wet season
water
ecosystem
cell respiration
anomaly
leaves
ecosystem response
litterfall
eddy covariance

ASJC Scopus subject areas

  • Soil Science
  • Forestry
  • Water Science and Technology
  • Palaeontology
  • Atmospheric Science
  • Aquatic Science
  • Ecology

Cite this

Hutyra, L. R., Munger, J. W., Saleska, S., Gottlieb, E., Daube, B. C., Dunn, A. L., ... Wofsy, S. C. (2007). Seasonal controls on the exchange of carbon and water in an Amazonian rain forest. Journal of Geophysical Research: Space Physics, 112(3), [G03008]. https://doi.org/10.1029/2006JG000365

Seasonal controls on the exchange of carbon and water in an Amazonian rain forest. / Hutyra, Lucy R.; Munger, J. William; Saleska, Scott; Gottlieb, Elaine; Daube, Bruce C.; Dunn, Allison L.; Amaral, Daniel F.; de Camargo, Plinio B.; Wofsy, Steven C.

In: Journal of Geophysical Research: Space Physics, Vol. 112, No. 3, G03008, 28.09.2007.

Research output: Contribution to journalArticle

Hutyra, LR, Munger, JW, Saleska, S, Gottlieb, E, Daube, BC, Dunn, AL, Amaral, DF, de Camargo, PB & Wofsy, SC 2007, 'Seasonal controls on the exchange of carbon and water in an Amazonian rain forest', Journal of Geophysical Research: Space Physics, vol. 112, no. 3, G03008. https://doi.org/10.1029/2006JG000365
Hutyra, Lucy R. ; Munger, J. William ; Saleska, Scott ; Gottlieb, Elaine ; Daube, Bruce C. ; Dunn, Allison L. ; Amaral, Daniel F. ; de Camargo, Plinio B. ; Wofsy, Steven C. / Seasonal controls on the exchange of carbon and water in an Amazonian rain forest. In: Journal of Geophysical Research: Space Physics. 2007 ; Vol. 112, No. 3.
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