Impacts of Atmospheric Ammonia Volatilized from the Cattle Feedlot on Nitrogen Deposition onto Japanese Cypress Canopy

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  • 牛舎からのアンモニア揮散が近傍のヒノキ樹木への窒素沈着に及ぼす影響
  • ギュウシャ カラ ノ アンモニアキサン ガ キンボウ ノ ヒノキ ジュモク エ ノ チッソ チンチャク ニ オヨボス エイキョウ

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Abstract

<p>The dry deposition of atmospheric ammonia (NH3) volatilized from feedlots, one of major loads of nitrogen into the basin, has been rarely observed at the tree canopies close to the feedlot in Ibaraki, Japan. We made multi-point annual observations of the NH3 concentration using passive samplers within and surrounding the cattle feedlot in Ibaraki. The throughfall and wet deposition of ammonium-nitrogen (NH4+-N) was also measured by bulk samplers under Japanese cypress trees near the feedlot. The annual mean NH3 concentration measured inside the feedlot (322 ppbv) was lower than that expected from the cattle density, suggesting the requirement for monitoring the micrometeorological environment and management processes inside the feedlot. The results also indicated that the local-scale spatial distributions of the NH3 concentration may be influenced by not only horizontal wind directions but also air temperature and humidity, buildings, and trees. The annual throughfall deposition of NH4+-N (27.5 kgN/ha/yr) was clearly greater than those observed in the Japanese forests in past studies, suggesting the high impact of the dry deposition of NH3 volatilized from the feedlot. The deposition velocity of NH3 was estimated to be 3.4±2.5 cm/s, which was the highest range level of literature values for coniferous forests.</p>

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