释放气候适应性,通过探索改进的旋转与覆盖作物的减缓潜力来释放气候适应性
Ahmed Attia1, Prem Woli1, Charles R Long1
1Texas A&M AgriLife Research and Extension Center, Overton, TX, 75684, USA.
Journal of environmental management
|July 2, 2025
概括
在作物轮换中的覆盖作物 (CCs) 显著提高了土壤有机碳 (SOC) 和用水效率 (WUE),同时减少了温室气体 (GHG) 排放和农业的碳足迹. 这些发现支持半干旱地区的气候智能农业.
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:
- 保护农业实践,包括用覆盖作物 (CCs) 进行作物轮换,通过减少温室气体 (GHG) 排放和增强土壤有机碳 (SOC) 捕获,为缓解气候变化提供了帮助.
- 在SOC封存和氧化 (N2O) 排放之间存在潜在的权衡,需要对CC对SOC和度的长期影响评估.
研究的目的:
- 为了确定豆类和非豆类CCs在作物交替中的影响作物生产率,SOC封存,温室气体排放,用水效率 (WUE) 和直接农场碳足迹 (DCFP).
- 在德克萨斯高原 (THP) 预测气候条件下,使用DSSAT模型评估CCs的空间变化和长期影响.
主要方法:
- 在德克萨斯高原的历史和预测气候条件下,利用DSSAT模型模拟带有和没有遮盖作物 (CCs) 的作物旋转.
- 在不同的旋转场景中比较作物生产率 (谷物单位),土壤有机碳 (SOC) 封存,温室气体 (GHG) 排放,用水效率 (WUE) 和直接农场碳足迹 (DCFP).
主要成果:
- 包括CC在内的旋转显著提高了谷物单位 (GU) 的稳定性,与正常运营 (BAU) 相比,提高了SOC封存率13.4%,与BAU相比,DCFP减少了60%.
- CCs改善了WUE,达到超过10.5公斤ha-1mm-1,特别是在北部和东部地区,并减少了净温室气体排放.
- 使用CC的轮换显示,与没有CC的改进轮换相比,SOC封存率高出6.9%,这表明长期碳储存的潜力.
结论:
- 在作物轮换中集成的覆盖作物提供了大量的农业和环境效益,包括加强SOC封存和减少碳足迹,支持气候智能农业.
- 使用CC优化作物轮换和营养管理对于半干旱地区的可持续农业强化至关重要,提高水资源效率.
- 该研究强调了CC在农业系统中减轻气候变化影响方面的关键作用.
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