In:
Journal of Geophysical Research: Atmospheres, American Geophysical Union (AGU), Vol. 100, No. D4 ( 1995-04-20), p. 7283-7290
Abstract:
This paper presents the first micrometeorological‐based measurements of methane (CH 4 ) emissions from Asian rice paddies of which we are aware. The research features the tunable diode laser trace gas analyzer system (TGAS) recently developed at the University of Guelph. CH 4 fluxes were measured between March 9 and 24, 1992, from an irrigated rice paddy field at the International Rice Research Institute (IRRI), the Philippines. The daytime CH 4 flux averaged 6.0 μg m −2 s −1 . The CH 4 fluxes displayed a diurnal trend similar to daily soil temperature curves, with peak emissions of about 8 μg m −2 s −1 in the early afternoon. A tenfold increase in CH 4 emissions (to about 70μg m −2 s −1 ) during a brief weeding experiment resulted from soil disturbance. Up to 25 μg m −2 s −1 of CH 4 were released during a drying of the field, after which unsuitable soil redox potentials apparently suppressed methanogenesis. The CH 4 flux was also arrested when the field was flooded with oxygen‐rich water during a heavy rainstorm.
Type of Medium:
Online Resource
ISSN:
0148-0227
Language:
English
Publisher:
American Geophysical Union (AGU)
Publication Date:
1995
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