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中国农田N2O排放通量原位观测研究的汇总分析

Keywords: 农田,N2O排放,原位观测,分布特征,作物类型

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Abstract:

通过对已有文献资料的调研和整理,分析了1990—2008年间有关中国农田N2O排放通量田间原位观测的分布特征。结果表明,1990—2008年间中国农田N2O排放通量原位观测研究呈不断发展趋势,2002年后进入快速增加期。通量原位观测位点的空间分布不平衡,主要集中在长江中下游、华北和西南地区,东北、西北、华南地区观测位点较少;农田N2O排放通量原位观测在作物类型间差异明显,对稻田的研究占到数据组总数的36%,其次为小麦和玉米田,分别占24%和21%,紫云英田仅为0.2%。针对农田N2O排放通量原位观测研究的现状,建议今后需进一步关注西北和东北典型农田生态系统N2O排放观测研究;在测定大宗作物系统N2O排放的基础上,重点加强典型菜地N2O通量的原位观测;强调温室气体CO2、CH4和N2O的同步观测与同位素示踪等技术相结合,以寻求农业增产、增效与温室气体减排的系统机制与实现途径。

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