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温室气体排放量因在连续米系统中引入全年地而改变

Zhenglin Zhang^1,2, Tommy L D Fenster^1,3, Bruce A Linquist¹

¹Department of Plant Sciences, University of California, Davis, California, USA.

Journal of environmental quality

|June 20, 2025

概括

在加利福尼亚州的单种植中引入休耕期显著减少了甲 (CH4) 排放. 该战略提供了一种有希望的方法来减轻大米生产中温室气体 (GHG) 的影响.

科学领域:

农业科学农业科学
环境科学环境科学
气候科学气候科学

背景情况:

加利福尼亚州的米生产通常涉及连续的单一作物,导致持续的温室气体 (GHG) 排放.
由于气候变化 (冬季干旱,春季降雨) 增加了休产频率,需要了解它们对温室气体排放的影响.

研究的目的:

量化和比较夏季和冬季温室气体排放量 (甲和氧化) 在连续大米,大米耕轮换和耕处理下.
评估引入为期一年的休期对大米种植的全球变暖潜力 (GWP) 的影响.

主要方法:

进行了为期3年的实地研究,使用了三种治疗方法:连续大米 (CR),大米后期 (FR) 和后期 (F).
温室气体排放,包括甲 (CH4) 和氧化 (N2O),在夏季和冬季测量.
分析了土壤有机碳分量 (颗粒和矿物相关),以了解影响排放的潜在机制.

主要成果:

夏季甲 (CH4) 排放量在与连续大米 (CR) 相比,在3年内,与大米 (FR) 处理相比,大米 (FR) 处理平均减少了33%.
在休 (F) 处理中观察到可以忽略的夏季CH4排放量.
夏季全球变暖潜力 (GWP) 占CR和FR年度GWP的96%以上,而冬季N2O排放在F处理中占主导地位.

结论:

在大米单一栽培中引入为期一年的休耕期有效地减少了整体温室气体排放,主要是通过减少甲释放.
这些发现为量化温室气体排放变化提供了关键数据,并为大米占主导地位的景观中的可持续农业实践提供了信息.
废物管理可能会影响休产期在减轻CH4排放方面的有效性,这需要进一步调查.

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