Methane emissions from five paddy fields with different amounts of rice straw application in central Hokkaido, Japan(Environment)
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概要
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Rice paddy fields are a major source of methane (CH_4) emissions, a potent greenhouse gas. We assessed CH_4 emissions from five existing paddy fields farmed in a snowy temperate region in central Hokkaido, Japan. All fields had continuous flooding and a paddy-fallow-paddy (rice) crop rotation system, but with different amounts of rice straw application. The rice straw application rate in the fields ranged from 0 to 219g dry matter m^<-2>. CH_4 emission increased with increasing amounts of rice straw. A peak in CH_4 emission at the end of the reproductive stage was observed in all fields receiving rice straw. When continuous flooding was interrupted by drainage for harvesting, emissions from all fields also dropped quickly. Total CH_4 emissions ranged from 4.04 to 40.8g CH_4-C m^<-2> per growing season. We found that CH_4 emissions (g CH_4-C m^<-2> per g dry matter) as per unit (dry matter) of rice straw applied in this study were significantly (P<0.05) higher than those of calculated reported values, presumably because of the retardation of straw decomposition rates during the winter fallow. There was a significant correlation between rice straw carbon application (SCA) rate and total CH_4 emission in continuously flooded fields (CH_4 emission [g C m^<-2> per growing period] = 0.486×SCA [g C m^<-2>]-1.644, r^2 = 0.884, P<0.05), and emissions were 2-10-fold greater than from fields with no rice straw. The results indicate that the presence of rice straw has a significant influence on CH_4 emissions from paddy fields.
- 社団法人日本土壌肥料学会の論文
著者
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HATANO Ryusuke
Laboratory of Soil Science, Graduate School of Agriculture, Hokkaido University
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Hatano Ryusuke
Laboratory Of Soil Science Graduate School Of Agriculture Hokkaido University
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Nagata Osamu
Lowland Soils Laboratory Bibai Branch National Agricultural Research Center For Hokkaido Region
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Naser Habib
Laboratory Of Soil Science Graduate School Of Agriculture Hokkaido University
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TAMURA Satsuki
Laboratory of Soil Science, Graduate School of Agriculture, Hokkaido University
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Tamura Satsuki
Laboratory Of Soil Science Graduate School Of Agriculture Hokkaido University
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Hatano Ryusuke
Laboratory Of Soil Science Faculty Of Agriculture Hokkaido University
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