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Abstract
The effect of water percolation on CH4 emission from rice paddies was investigated using a lysimeter experiment for 4 years. Water percolation rates of the lysimeters were adjusted to one of three values, about 0, 5, or 20 mm day-1, during the cultivation periods of the first 3 years by periodically opening water stopping valves installed at the bottom of the lysimeters. In the 4th year, water was drained by pumps at a rate of 0, 7.7, or 25 mm day-1, respectively. CH4 emission rates significantly decreased with an increase in the percolation rates. Total emission during a cultivation period ranged from 5.7 to 13.8, 0.6 to 4.8, and 0.1 to 0.3 g m-2 in the no-, moderate-, and high-percolation plots, respectively. The decrease in soil Eh during the cultivation periods was markedly retarded by water percolation. The critical initiation soil Eh of CH4 emission observed was around −30 mV at 5 cm depth. CH4 emissions during the fallow periods (from September to May) were equivalent to 14–18% of those during the previous cultivation period if the paddies were continuously flooded all the year round. Low soil temperature during the fallow periods was a major limiting factor for CH4 emission during these periods in the case of continuously flooded treatment.
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Japan International Research Center for Agricultural Sciences, Tsukuba, 305, Japan
Kazuyuki Yagi
National Institute of Agro-Environmental Sciences, Tsukuba, 305, Japan
Katsuyuki Minami
Agricultural Research Institute, Ibaraki Agricultural Center, Mito, 311–42, Japan
Yoshio Ogawa
- Kazuyuki Yagi
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Yagi, K., Minami, K. & Ogawa, Y. Effects of water percolation on methane emission from rice paddies: a lysimeter experiment.Plant and Soil198, 193–200 (1998). https://doi.org/10.1023/A:1004379914540
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