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融雪流量多年变化与土壤P吸收或对有机料作物施加 struvite 的多年变化

Henry Wilson¹, Kokulan Vivekananthan², Merrin Macrae³

¹Agriculture and Agri-Food Canada, Science and Technology Branch, Brandon Research and Development Centre, Brandon, Manitoba, Canada.

Journal of environmental quality

|October 23, 2025

概括

北大平原的有机管理表明,使用缓释斯特鲁维特肥料时, (P) 排水损失低于预期. 料产量的P限制发生在没有P修改的情况下.

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:

有机农业的做法旨在保持土壤的肥力,并尽量减少对环境的影响.
来自农田的 (P) 排放是肥胖化的主要原因.
像斯特鲁维特这样的缓释肥料在有机系统中提供了P管理的潜力.

研究的目的:

在北大平原七年内评估在有机管理下P流失的P流失.
将测量的P流量与区域模型的预测进行比较.
评估在多年料和一年粮系统中施用 struvite 后的 P 损失的风险.

主要方法:

在加拿大曼尼托巴省 (2017-2023) 进行的实地规模研究,使用了三个小型流域.
比较两年一次的 struvite 应用 (4 个站点年) 没有 P 修改 (drawdown, 8 个站点年).
测量了土壤P (奥尔森P),P负荷,以及雪融流量中的流量加权平均度 (FWMCs).
经过验证的区域模型使用Olsen P,水产和地表覆盖作为预测因素.

主要成果:

土壤奥尔森P与P平衡有很强的相关性 (输入/删除).
在吸收处理中观察到料产量的P限制.
斯特鲁维特应用后的P流失总是低于区域模型预测的.
较高的奥尔森P水平表明了较高的P损失风险.

结论:

斯特鲁维特的应用导致了比预测更低的P径流损失,这表明斯特鲁维特在径流中的溶解性较低.
使用斯特鲁维特的有机管理可以成为P管理的可行策略,降低了缩风险.
需要进一步的研究来完善缓释肥料的P损失预测模型.

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