Methane production and emission of paddy soils in Taiwan
- National Taiwan Univ., Taiperi (Taiwan, Province of China)
Flooded paddy soils are the important source to produce methane, through anaerobic microbial processes. Methane production and emission in the paddy soils with a pot study from the period of spring 1992 to winter 1993, and field study from summer 1994 to summer 1995 were investigated. In the pot study, the amount of methane production and emission at the first crop were about two to ten times higher than that at the second crop. While the phenomenon was reverse in the field study. Sandy loam from Tzawchyau had the highest methane production and emission, silty clay from Jiaushi was the next, while clay soil from Linkou was the lowest one. Organic fertilizer application increased soil pH, organic matter content, and methane emission, but reduced Eh value. High methane emission rate was at the strong tillering and flowering stages at the first crop, and at the early growth stage at the second crop in field study. The maximum methane emission rate of Tzawchyau sandy loam in pot study was between 167 to 176 mg m{sup -2} h{sup -1} at the first crop, and it was between 7.3 to 12.4 mg m{sup -2} h{sup -1} at the second crop. While the maximum methane emission rate in field study was 68 mg m{sup -2} h{sup -l} at the first crop, and it was 110 mg m{sup -2} h{sup -1} at the second crop. Most of methane was produced in the soils from 15 to 30 cm depth. Methane emission rate had the maximum value at 12 a.m. to 5 p.m., whereas it had the minimum value at 3 to 6 a.m. There is a positive correlation between the methane production and the amount of straw application in the range from 0 to 20%. The maximum methane production was at 30 to 37{degrees}C, and decreased as the temperature higher than 40{degrees}C or lower than 25{degrees}C.
- OSTI ID:
- 466097
- Report Number(s):
- CONF-9606185-; TRN: 96:005931-0046
- Resource Relation:
- Conference: 5. international conference on atmospheric sciences and applications to air quality, Seattle, WA (United States), 18-20 Jun 1996; Other Information: PBD: 1996; Related Information: Is Part Of The 5th international atmospheric sciences and applications to air quality conference; PB: 322 p.
- Country of Publication:
- United States
- Language:
- English
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