极端天气事件对来自大米-小麦旋转作物田的氧化排放的影响
Ye Xia1, Congsheng Fu1,2, Aimin Liao3
1Key Laboratory of Watershed Geographic Sciences, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China.
Plants (Basel, Switzerland)
|January 11, 2024
概括
极端天气显著影响中国的氧化 (N2O) 排放.
科学领域:
- 环境科学 环境科学
- 农业科学 农业科学
- 气候科学 气候科学
背景情况:
- 耕地生态系统是氧化 (N2O) 的主要来源,这是一个强大的温室气体.
- 关于极端天气事件如何影响农业系统中的N2O流量的研究有限.
- 了解这些影响对于减缓气候变化和农业管理至关重要.
研究的目的:
- 为了研究N2O流对在米-小麦旋转作物种植地的极端天气事件的反应.
- 在不同的天气场景下量化N2O排放,并预测未来的变化.
- 评估农田极端天气在长江中流和下流 (MLRYR) N2O排放中的作用.
主要方法:
- 在三年内对N2O流的综合现场观测.
- 模拟模型用于分析对极端高温,降雨和干旱的反应.
- 区域气候建模以预测未来的N2O排放趋势.
主要成果:
- 米-小麦耕地是净N2O来源,年排放量从190.4到261.8毫克Nm-2.
- 极端高温导致N2O排放增加了23-32%.
- 降水效应各不相同:在潮湿和干燥的极端条件下,灌米田的排放量较低,但在潮湿和平均条件下,雨小麦田的排放量较高.
结论:
- 极端天气事件显著改变了大米-小麦作物种植地的N2O排放.
- 未来的气候预测表明,MLRYR地区的N2O排放量将大幅增加.
- 需要进一步验证模型,以准确预测极端天气影响下的N2O动态.
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