不同模拟方法对稻麦轮作系统温室气体估算差异-《江苏农业科学》

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Title:: Differences in greenhouse gas estimation of rice-wheat rotation system by different simulation methods

作者:: 杨雨茗; 河海大学环境学院，江苏南京 210098

Author(s):: Yang Yuming

关键词:: 稻麦轮作; DNDC模型; IPCC2006 Tier2; 温室气体

Keywords:: -

分类号:: S181；S344.1

DOI:: -

文献标志码:: A

摘要:: 温室气体排放导致的全球气候变化问题是社会关注的重要问题，如何较准确地估算各领域内的温室气体排放通量对制定减排策略具有重要意义。为分析研究区水稻—冬小麦轮作系统温室气体(CH₄、N₂O)排放水平，对比IPCC2006 Tier2及DNDC模型法估算研究区稻麦轮作系统的CH₄和N₂O排放通量估算差异，定量评估DNDC模型是否适用于轮作系统的温室气体排放估算。于2015—2018年进行稻麦轮作野外试验，利用静态箱-气相色谱分析法定期测定CH₄和N₂O排放通量，结合田间管理和气象数据开展IPCC2006 Tier2和DNDC模型模拟，利用DNDC模型模拟轮作和非轮作情景的稻麦温室气体排放通量。结果表明，DNDC模型可以较好地模拟出稻田CH₄、N₂O和麦田N₂O排放通量时序变化特征，估算误差分别为-4.8%、-11.6%、-10.8%，精度优于IPCC2006 Tier2；DNDC模型对稻麦轮作的GWP模拟精度高于IPCC2006 Tier2，稻田和麦田GWP模拟相对误差分别为-5.9%、-21.7%；除了冬小麦生育期CH₄排放通量，DNDC轮作模式对其他稻麦轮作温室气体排放通量的模拟相对误差均低于非轮作模式。进而为区域农业温室气体估算及制定减排方案提供科学依据。

Abstract:: -

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