Seasonal Variations in Vertical Distribution of Methanogenic Activity and Fe(II) Content and Relationship between Them in Wetland Rice Field Soil
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概要
- 論文の詳細を見る
Methanogenic activity and Fe(II) content in soil samples collected at different depths of the plow layer in a wetland rice field were determined over a period of 1 y. The methanogenic activity increased at first in the top layer of soil (0-1 cm in depth) during the continuous flooding period of the field and the activity decreased after the period of midseason drainage. In contrast, in the deeper soil layers, the increase in the activity persisted during the period of intermittent irrigation after midseason drainage and the period of the highest methanogenic activity at each depth in the year varied for about 1 month depending on the depth. The Fe(II) content in soil did not change appreciably during the continuous flooding period regardless of the soil depth. However, after midseason drainage, the content significantly varied with depth. Thus, until the midseason drainage, a sharp increase in the methanogenic activity preceded the increase in the Fe(II) content in the surface (0-1 cm) soil layer, while the opposite was observed in the deeper soil layers. Based on these data, the relationship between the methanogenic activity and Fe(II) content in soil was investigated by calculating the correlation coefficients between them and comparing the slopes and constants of regression lines obtained. It was found that although during the cropping season of rice the methanogenic activity depended mainly on the Fe(II) content in soil as a whole, the relationship between the two parameters was different before and after the period of midseason drainage. The relationship between them before the midseason drainage was distinctly different depending on the depth, while after the midseason drainage the relationship was almost the same irrespective of the depth. During the non-cropping season, no correlation was obtained between the two parameters. Most of the correlation coefficients between the methanogenic activity and the soil temperature were low for all the data sets examined except for the deepest soil layer (13-15 cm) during the cropping season. Correlation coefficients between the methanogenic activity and water content in soil were also low.
- 社団法人日本土壌肥料学会の論文
著者
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Fujii Hiroshi
Dep. Of Bioscience And Biotechnology Shinshu Univ.
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UEKI KATSUJI
Faculty of Agriculture, Yamagata University
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UEKI ATSUKO
Faculty of Agriculture, Yamagata University
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Ueki A
Faculty Of Agriculture Yamagata University
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Ueki K
Faculty Of Agriculture Yamagata University
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Fujii Hiroshi
Shonai Branch of Yamagata Agricultural Experimental Station
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Kainuma Yuki
Faculty of Agriculture, Yamagata University
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Ueki Katsuji
Faculty Of Agriculture Yamagata University
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Fujii H
Yamagata Agricultural Experimental Station Shounai Branch
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Kainuma Yuki
Faculty Of Agriculture Yamagata University
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Fujii Hiroshi
Interdisciplinary Graduate School Of Science And Technology Shinshu University
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Ueki Atsuko
Faculty Of Agriculture Yamagata University
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