Gross ecosystem photosynthesis causes a diurnal pattern in methane emission from rice

Jaclyn A. Hatala; Matteo Detto; Dennis D. Baldocchi

doi:10.1029/2012GL051303

Gross ecosystem photosynthesis causes a diurnal pattern in methane emission from rice

Jaclyn A. Hatala, Matteo Detto, Dennis D. Baldocchi

Research output: Contribution to journal › Article › peer-review

108 Scopus citations

Abstract

Understanding the relative contribution of environmental and substrate controls on rice paddy methanogenesis is critical for developing mechanistic models of landscape-scale methane (CH₄) flux. A diurnal pattern in observed rice paddy CH₄ flux has been attributed to fluctuations in soil temperature physically driving diffusive CH₄ transport from the soil to atmosphere. Here we make direct landscape-scale measurements of carbon dioxide and CH₄ fluxes and show that gross ecosystem photosynthesis (GEP) is the dominant cause of the diurnal pattern in CH₄ flux, even after accounting for the effects of soil temperature. The time series of GEP and CH₄ flux show strong spectral coherency throughout the rice growing season at the diurnal timescale, where the peak in GEP leads that of CH ₄ flux by 1.3±0.08 hours. By applying the method of conditional Granger causality in the spectral domain, we demonstrated that the diurnal pattern in CH₄ flux is primarily caused by GEP.

Original language	English (US)
Article number	L06409
Journal	Geophysical Research Letters
Volume	39
Issue number	6
DOIs	https://doi.org/10.1029/2012GL051303
State	Published - Mar 28 2012
Externally published	Yes

All Science Journal Classification (ASJC) codes

Geophysics
General Earth and Planetary Sciences

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10.1029/2012GL051303

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title = "Gross ecosystem photosynthesis causes a diurnal pattern in methane emission from rice",

abstract = "Understanding the relative contribution of environmental and substrate controls on rice paddy methanogenesis is critical for developing mechanistic models of landscape-scale methane (CH4) flux. A diurnal pattern in observed rice paddy CH4 flux has been attributed to fluctuations in soil temperature physically driving diffusive CH4 transport from the soil to atmosphere. Here we make direct landscape-scale measurements of carbon dioxide and CH4 fluxes and show that gross ecosystem photosynthesis (GEP) is the dominant cause of the diurnal pattern in CH4 flux, even after accounting for the effects of soil temperature. The time series of GEP and CH4 flux show strong spectral coherency throughout the rice growing season at the diurnal timescale, where the peak in GEP leads that of CH 4 flux by 1.3±0.08 hours. By applying the method of conditional Granger causality in the spectral domain, we demonstrated that the diurnal pattern in CH4 flux is primarily caused by GEP.",

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T1 - Gross ecosystem photosynthesis causes a diurnal pattern in methane emission from rice

AU - Hatala, Jaclyn A.

AU - Detto, Matteo

AU - Baldocchi, Dennis D.

PY - 2012/3/28

Y1 - 2012/3/28

N2 - Understanding the relative contribution of environmental and substrate controls on rice paddy methanogenesis is critical for developing mechanistic models of landscape-scale methane (CH4) flux. A diurnal pattern in observed rice paddy CH4 flux has been attributed to fluctuations in soil temperature physically driving diffusive CH4 transport from the soil to atmosphere. Here we make direct landscape-scale measurements of carbon dioxide and CH4 fluxes and show that gross ecosystem photosynthesis (GEP) is the dominant cause of the diurnal pattern in CH4 flux, even after accounting for the effects of soil temperature. The time series of GEP and CH4 flux show strong spectral coherency throughout the rice growing season at the diurnal timescale, where the peak in GEP leads that of CH 4 flux by 1.3±0.08 hours. By applying the method of conditional Granger causality in the spectral domain, we demonstrated that the diurnal pattern in CH4 flux is primarily caused by GEP.

AB - Understanding the relative contribution of environmental and substrate controls on rice paddy methanogenesis is critical for developing mechanistic models of landscape-scale methane (CH4) flux. A diurnal pattern in observed rice paddy CH4 flux has been attributed to fluctuations in soil temperature physically driving diffusive CH4 transport from the soil to atmosphere. Here we make direct landscape-scale measurements of carbon dioxide and CH4 fluxes and show that gross ecosystem photosynthesis (GEP) is the dominant cause of the diurnal pattern in CH4 flux, even after accounting for the effects of soil temperature. The time series of GEP and CH4 flux show strong spectral coherency throughout the rice growing season at the diurnal timescale, where the peak in GEP leads that of CH 4 flux by 1.3±0.08 hours. By applying the method of conditional Granger causality in the spectral domain, we demonstrated that the diurnal pattern in CH4 flux is primarily caused by GEP.

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Gross ecosystem photosynthesis causes a diurnal pattern in methane emission from rice

Abstract

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