确定在间歇性灌下减轻甲和氧化物排放的水品种
Sandra Loaiza1, Louis Verchot2, Drochss Valencia3
1International Center for Tropical Agriculture (CIAT), Cali, Colombia; Omicas Program, Pontificia Universidad Javeriana sede Cali, Calle 18 No. 118-250, Cali, C.P, 760031, Colombia; Department of Plant Sciences, University of California, Davis One Shields Avenue, Davis, CA, 95616, USA.
选择特定的水品种可以在间歇灌下显著减少温室气体 (GHG) 排放和全球变暖潜力 (GWP),这对于气候智能农业至关重要.
科学领域:
- 农业科学 农业科学
- 环境科学 环境科学
- 气候变化研究 气候变化研究
背景情况:
- 对温室气体 (GHG) 减缓的米种植研究中持续的洪水是常见的,但由于水资源短缺,全球间歇性灌正在增加.
- 间歇性灌实践可以改变甲 (CH4) 和氧化 (N2) 排放,影响整体全球变暖潜力 (GWP).
- 识别减少CH4和N2O排放的米品种,同时在间歇性灌下保持产量,对于气候智能米生产至关重要.
研究的目的:
- 评估哥伦比亚间歇灌下四种米品种的CH4和N2O排放量,谷物产量和GWP.
- 确定适合气候智能农业和缺水条件的米品种.
主要方法:
- 在2020年和2021年两个季节 (湿和干) 评估四种商用大米品种.
- 实地实验在哥伦比亚两个地区进行:托利马和卡萨纳雷.
- 测量CH4和N2O排放量,谷物产量,并计算GWP.
主要成果:
- 农作物生产率因季节和地点而异;由于水压力,一些品种在干旱季节产量减少.
- 由于经常排水,甲 (CH4) 排放量和GWP通常较低,但氧化 (N2O) 排放量对GWP有显著 (73%) 的贡献.
- 特定品种 (托利马的F67,卡萨纳雷的F-Itagua) 通过减少N2O排放而不是CH4,将GWP降低了32-61%.
结论:
- 米品种选择可以有效地减轻间歇性灌下的GWP,对谷物产量产生最小的影响.
- 通过战略品种选择减少N2O排放对于降低水资源短缺和气候变化适应的水系统的GWP至关重要.
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