Runoff generation and phosphorus mobilization in agricultural landscapes

农业景观中径流的产生和磷的动员

• 批准号: RGPIN-2015-04816
• 负责人: Macrae, Merrin
• 金额: $ 1.6万
• 依托单位: University of Waterloo
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2017
• 资助国家: 加拿大
• 起止时间: 2017-01-01 至 2018-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=634168
• 关键词: Runoff; generation; phosphorus; mobilization; agricultural

Phosphorus (P) export from non-point sources in agriculture-dominated catchments is a global issue, and a priority area for many regions in Canada, where Harmful Algal Blooms (HABs) have been observed in large lakes with increasing frequency. Despite the implementation of Beneficial Management Practices (BMPs) to reduce P loss, P loads are not decreasing and in fact are increasing in some regions. Existing models for P export and management strategies largely target rainfall event-driven surface runoff and do not effectively address winter processes and the snowmelt period. This period represents a significant gap in our scientific understanding of P mobilization in agricultural regions. In many midlatitude regions globally, the winter period is the dominant annual flux for both runoff and P. Thus, an understanding of the drivers of P loss in winter and early spring is needed.

以农业为主的流域非点源磷（P）出口是一个全球性问题，也是加拿大许多地区的优先领域，尽管实施了这些措施，但在这些地区大型湖泊中发现有害藻华（HAB）的现象越来越频繁。为减少磷损失而实施的有益管理实践（BMP），磷负荷并未减少，事实上，在一些地区，现有的磷输出和管理策略模型主要针对降雨事件驱动的地表径流，而不是减少。有效地解决冬季过程和融雪期。这一时期代表了我们对农业地区磷动员的科学认识上的重大差距。在全球许多中纬度地区，冬季是径流和磷的主要年度通量。需要了解冬季和早春磷流失的驱动因素。