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研究论文

摘要：采用针对农业土壤痕量气体排放估算开发的、基于N₂O的产生、传输和消耗机理的反硝化分解模型(DNDC模型), 在建立的有关中国气候、农业土壤和农业生产的分县数据库基础上, 估计了我国目前农业土壤N₂O的排放量, 并分析了气候变化和农业耕作措施对全国N₂O排放的影响.结果表明, 中国农田土壤的N₂O排放总量为0.31(0.18—0.44)Tg(N)·a^-1, 化肥使用量的变化对N₂O排放量的影响最大.

Abstract：In conjunction with a database containing climate, agricultural soil and cultivating measures at county scale in China, a process based decomposition and denitrification (DNDC) model was deployed to estimate N₂O emissions from agricultural soils in China. In addition, impacts of changes in climate and cultivating measures on N₂O emissions were also evaluated. The results showed that the total N₂O of 0.31(0.18—0.44) Tg(N)·a^-1 was released from agricultural soil in China, and the amount of applied fertilizer is the most important factor influencing soil N₂O emission.