一个框架来估计美国当前和未来条件的便平衡和回收潜力
Yanyu Wang1,2, Xin Zhang3,4, Sheri Spiegal5
1Appalachian Laboratory, University of Maryland Center for Environmental Science, Frostburg, MD, USA.
Nature food
|March 10, 2026
概括
肥料回收可以减少肥料需求和污染. 优化营养管理和作物效率为改善平衡提供了巨大的潜力,但必须考虑限量.
科学领域:
- 农业科学 农业科学
- 环境科学 环境科学
- 土壤科学 土壤科学
背景情况:
- 糞便回收提供了一种可持续的方法来减轻污染,并减少对合成肥料的依赖.
- 估计可回收的肥营养素和作物营养需求的变化阻碍了对肥回收潜力的明确理解.
研究的目的:
- 制定一个框架来评估当前和未来的便回收潜力.
- 通过对现有方法的比较分析,量化连接美国的 (N) 余额.
- 评估技术进步和提高作物N效率对便回收的影响.
主要方法:
- 应用了六项先前研究的方法来估计肥N平衡 (可回收的肥N减去作物N需求).
- 开发了一个新的框架来评估当前和未来的便回收潜力.
- 在连接的美国境内,分析了国家和县级的N余额.
主要成果:
- 美国目前的平衡为-13.3 ± 1.1 TgN yr-1,表明由合成肥料弥补的大量赤字.
- 改进的肥料管理技术可以将这个赤字减少5% (目前) 到21% (未来).
- 为了防止 (P) 的过度应用,需要减少33-36%的新肥N应用,而提高作物N效率可以减少27%的赤字.
结论:
- 肥料回收提供了改善营养管理和减少环境影响的重要机会.
- 肥料管理的技术进步和提高作物N效率对于最大限度地利用回收潜力至关重要.
- 区域评估突出了人工肥料回收的可变机会,强调了本地化战略的必要性.
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