In:
Journal of Geophysical Research: Atmospheres, American Geophysical Union (AGU), Vol. 101, No. D15 ( 1996-09-20), p. 21091-21097
Abstract:
Emission rates of CH 4 from paddy soil with and without rice straw applications were measured with pot experiments to estimate the contribution of rice straw to the total CH 4 emission during the growth period of rice plants. The CH 4 derived from rice straw was calculated to be 44% of the total emission. 13 CO 2 uptake experiments were also carried out four times from June 30 to September 13, 1994, to estimate the contribution of photosynthesized carbon to CH 4 emission. The contribution percentages of photosynthesized carbon to the total CH 4 emitted to the atmosphere were 3.8% around June 30, 31% around July 25, 30% around August 19, and 14% around September 13 in the treatment with rice straw applications, and 52% around July 25, 28% around August 19, and 15% around September 13 in the treatment without rice straw applications. They were calculated to be 22% and 29% for the entire growth period in the treatments with and without rice straw applications, respectively. The contribution percentages of photosynthesized carbon to the total CH 4 and inorganic carbon (Σ CO 2 ) dissolved in soil water were 1.3%, 30%, 29%, and 34% for dissolved CH 4 and 3.0%, 36%, 30% and 28% for dissolved inorganic carbon around June 30, July 25, August l9, and September 13, respectively, in the treatment with rice straw applications. They were 70%, 23%, and 32% for dissolved CH 4 and 31%, 16%, and 19% for dissolved inorganic carbon around July 25, August 19, and September 13, respectively, in the treatment without rice straw applications.
Type of Medium:
Online Resource
ISSN:
0148-0227
Language:
English
Publisher:
American Geophysical Union (AGU)
Publication Date:
1996
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