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评估来自多年料作物的融雪损失的可能性
Henry Wilson1, Jane Elliott2, Merrin Macrae3
1Agriculture and Agri-Food Canada, Science and Technology Branch, Brandon Research and Development Centre, Brandon, Manitoba, Canada.
Journal of environmental quality
|April 15, 2025
概括
(P) 损失与融雪流失并不是更高的从多年生料比一年生作物. 土壤的P含量和作物残留覆盖是关键因素,如果谨慎管理,可能会减少P出口.
科学领域:
- 环境科学 环境科学
- 土壤科学 土壤科学
- 农业科学 农业科学
背景情况:
- 与寒冷地区的一年作物相比,人们担心 (P) 通过从多年性料作物中融雪而流出的流失.
- 植被的冷-解周期可以影响P的调动和运输.
- 了解P损失驱动因素对于在寒冷气候下可持续的农业管理至关重要.
研究的目的:
- 为了评估 (P) 损失与融雪流水的驱动因素.
- 为了比较多年生料和一年生作物之间的P损失.
- 评估土地使用历史和管理实践对P.出口的影响.
主要方法:
- 在加拿大曼尼托巴省的小型流域进行实地规模研究.
- 收集了超过82个地点年的数据,包括年作物,多年料和耕作终止的料.
- 分析了总溶解P和总P的流量加权平均度和负载.
主要成果:
- 植被类型没有显著影响度或雪融流水中的P负载.
- 顶部0-5厘米的Olsen-P土壤是P度 (溶解和总量) 的最佳预测指标.
- 没有耕种的历史导致了土壤表层中较大的P分层,无论植被类型如何.
- 融雪的P负荷主要是由水产驱动的;多年生料的水产低于一年生作物.
结论:
- 将多年生植物添加到作物轮换中不会增加 P 损失与融雪流失,当土壤 P 经过仔细管理时.
- 多年性料可能通过对水文学的积极影响来减少整体P负荷.
- 对土壤P和作物残渣覆盖的管理对于在寒冷地区减轻P出口至关重要.
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