Circadian rhythms constrain leaf and canopy gas exchange in an Amazonian forest

Details Circadian rhythms constrain leaf and canopy gas exchange in an Amazonian forest Circadian rhythms constrain leaf and canopy gas exchange in an Amazonian forest

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3315404d&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 15, CiteID L15404

Physics

Geophysics

4

Biogeosciences: Biogeochemical Cycles, Processes, And Modeling (0412, 0793, 1615, 4805, 4912), Biogeosciences: Biogeophysics, Biogeosciences: Diel, Seasonal, And Annual Cycles (4227), Biogeosciences: Plant Ecology (1851), Global Change: Land/Atmosphere Interactions (1218, 1843, 3322)

Scientific paper

We used a controlled-environment leaf gas-exchange system and the micrometeorological technique eddy covariance to determine whether circadian rhythms constrain the rates of leaf and canopy gas exchange in an Amazonian forest over a day. When exposed to continuous and constant light for 20 to 48 hours leaves of eleven of seventeen species reduced their photosynthetic rates and closed their stomata during the normally dark period and resumed active gas exchange during the normally light period. Similarly, the rate of whole-forest CO2 uptake at a predetermined irradiance declined during the late afternoon and early morning and increased during the middle of the day. We attribute these cycles to circadian rhythms that are analogous to ones that have been reported for herbaceous plants in the laboratory. The importance of endogenous gas exchange rhythms presents a previously unrecognized challenge for efforts to both interpret and model land-atmosphere energy and mass exchange.

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