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研究报告

N₂O emission from pond and river in the agricultural watershed of Jurong reservoir, Jiangsu Province

基金项目：安徽省人保厅省高层次人才创新创业项目(No.2009Z069);安徽省教育厅重点项目(No.KJ2009A108);安徽省自然科学基金青年项目(No.10040606Q12)

摘要：在句容水库农业流域的水塘和河流中,用密闭箱法于2007年8、11月和2008年2、5月采集水体表面排放的N₂O气样,研究水塘和河流N₂O排放速率的季节变化及其影响因素.结果显示,水塘N₂O的排放速率范围在-0.42~16.76 μg · m^-2 · h^-1之间,河流N₂O排放速率在0.29~8.41 μg · m^-2 · h^-1之间.由于降雪后冻融过程的影响,水塘和河流N₂O排放速率在2月份达到最大值.流域内水塘和河流N₂O总排放速率为118.4 kg · a^-1,农业流域水塘和河流是N₂O的重要排放源.

Abstract：N₂O gas samples were collected from the pond and river water surface in the agricultural watershed of Jurong reservoir, Jiangsu Province during August 2007 and May 2008. The seasonal variations in N₂O flux emitting from these water bodies and their impact factors were analyzed. The results showed that N₂O emission fluxes ranged from -0.42 to 16.76 μg · m^-2 · h^-1 for ponds and from 0.29 to 8.41 μg · m^-2 · h^-1 for rivers. Ambient temperature affected N₂O emission significantly, with the largest emission in February due to the water freeze-thaw after snowing. The flux of total N₂O emission from ponds and rivers was 118.4 kg · a^-1, indicating that ponds and rivers were important sources of N₂O emission.