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Coupling atmospheric ammonia exchange process over a rice paddy field with a multi-layer atmosphere-soil-vegetation model

Katata, Genki; Hayashi, Kentaro*; Ono, Keisuke*; Nagai, Haruyasu  ; Miyata, Akira*; Mano, Masayoshi*

A multi-layer atmosphere-SOiL-VEGetation model (SOLVEG) was modified to calculate the NH$$_{3}$$ exchange fluxes over a paddy field. The heat transfer at the paddy water layer and the dry deposition of water-soluble gases such as NH$$_{3}$$ and SO$$_{2}$$ onto the wet canopy, as well as the emission potentials of NH$$_{3}$$ from the rice foliage and the surface of floodwater or soil were incorporated into the model. The modified model reproduced the observed surface and NH$$_{3}$$ fluxes, paddy water temperature, and soil temperature and moisture during both the fallow and cropping seasons. The "recaptured fraction" was defined as the ratio of the amount of volatilized NH$$_{3}$$ recaptured by the foliage to the total amount. Numerical experiments using the modified model with varying emission potentials of NH$$_{3}$$ showed that the recaptured fraction increased with an increase in the leaf area index (LAI) and saturated when LAI $$>$$ 1 because of the limitation of stomatal uptake.

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Category:Agronomy

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