湛水休耕田における炭素および窒素収支

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タイトル別名
  • Carbon and Nitrogen Budgets in a Flooded Fallow Paddy Field.
  • タンスイ キュウコウデン ニ オケル タンソ オヨビ チッソ シュウシ

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Due to the political regulation of rice production, the area of fallow paddy fieldsamounts to 6590 km2, which corresponds to 30% of the total paddy fields registered in Japan. Understanding the material flow is essential for making an appropriatemangement and use of this broad area. In this study, a fallow paddy field in Kanazawawas flooded, and the carbon and nitrogen budgets were quantitatively investigatedthrough two years. In the field studied, 400-580 gC/m2/yr was fixed by the aquaticplants as a net primary production, 170-210 gC/m2/yr accumulated in soil, 10-60 gC/m2/yr of dissolved organic carbon was released into the surrounding water, and 220gC/m2/yr of organic carbon was estimated to decompose. In the nitrogen budget, 9-20gN/m2/yr was removed from the surface water during passing through the field, 15-18 gN/m2/yr was absorbed by the aquatic plants, and 4-22 gN/m2/yr accumulated in soil. From the nitrogen budget calculation, 8 gN/m2/yr was estimated to be denitrifiedinto the air. The present study demonstrates that the flooded fallow paddy field acts as acarbon sink within an initial several years of flooding, but that it also acts as adissolved organic carbon source to the surrounding water. The area accumulatesnitrogen in soil and removes nitrate from surface runoff by denitrification as well asby plant uptake.

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  • 環境科学会誌

    環境科学会誌 11 (2), 123-130, 1998

    社団法人 環境科学会

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