The Role of Dissolved CH₄ in Soil Solution in the CH₄ Emission from Water-Saving Irrigated Rice Fields

Abstract:

To examine how the dissolved CH₄ in soil solution would affect the CH₄ emission from rice field, fluxes of CH₄ emission were measured by using a manually closed static chamber-gas chromatography method, and the dissolved CH₄ in soil solution was obtained through shaking soil solutions, which were extracted from different paddy soil layers by a soil solution sampler with suction and pressure. The results show that the CH₄ fluxes from rice fields and the concentration of dissolved CH₄ in soil solution are both reduced significantly under the water-saving irrigation as compared to the traditional flooded irrigation. Under the water-saving irrigation, naturally receding water-layer during the early stage leads to an earlier peak of CH₄ flux, but dramatically reduces the concentration of dissolved CH₄ in soil solution. The maximum concentration is shifted to about 20-cm depth soil layers, and the relationship between CH₄ emissions and dissolved CH₄ in soil solution can be estimated using an exponential function of dissolved CH₄ in soil solution at the depth of about 20 cm (R2＝0.89, p4 in soil solution plays a more dominant role in CH₄ emission under the water-saving irrigation than that under continuously flooded irrigation.

• Periodical: Applied Mechanics and Materials (Volumes 148-149)
• Pages: 977-982
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.148-149.977
• Online since: December 2011
• Authors: Dao Xi Li
• Keywords: CH₄ Emissions, Dissolved CH₄, Rice Fields, Water-Saving Irrigation

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