管理矿物应用与土壤残留再利用在加拿大
Jiaxin Wang1, Zhiming Qi1, Elena M Bennett2
1Department of Bioresource Engineering, McGill University, Sainte-Anne-de-Bellevue, Quebec, Canada.
Global change biology
|November 10, 2023
概括
在农业土壤中再利用剩余 (P) 可以显著减少加拿大的P需求和损失. 这种方法提高了作物P使用效率,并减轻了P流量造成的环境污染.
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:
- 有限的 (P) 供应和不断增长的需求需要有效的P管理.
- 排放会导致环境污染,这凸显了可持续实践的必要性.
- 农业土壤储存大量的残留P,这是一个潜在的资源.
研究的目的:
- 调查残留土壤P在加拿大维持作物产量的潜力.
- 通过利用残留土壤P.来评估减少P应用和损失的可行性.
- 模拟长期的土壤P动态及其对P管理的影响.
主要方法:
- 利用一个合的P循环和土壤P动态模型.
- 模拟了加拿大各省110年的土壤P动态.
- 分析了矿物P需求的潜在减少和P流失.
主要成果:
- 剩余的土壤P可以使加拿大每年的矿物P需求减少29% (132 Gg P yr-1).
- 加拿大的耕地P使用效率可以通过使用剩余土壤P提高21%.
- 预计大西洋省份和北克省的P流量损失将大大减少.
结论:
- 剩余土壤P是加拿大可持续农业的宝贵资源.
- 利用剩余的土壤P可以大大降低P的应用率和环境损失.
- 这种方法为减轻P污染和提高营养使用效率提供了一条途径.
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