Landscape-scale effects of nitrogen on lake ecosystems: Accelerating a new paradigm for freshwater eutrophication.

氮对湖泊生态系统的景观尺度影响：加速淡水富营养化的新范例。

• 批准号: 155612-2013
• 负责人: Leavitt, Peter
• 金额: $ 4.37万
• 依托单位: University of Regina
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2014
• 资助国家: 加拿大
• 起止时间: 2014-01-01 至 2015-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=545712
• 关键词: Landscape; scale; effects; nitrogen; lake

We hypothesize that increases in agricultural fertilization needed to feed 3 billion more people by 2050 will saturate soils with phosphorus (P) and create conditions in which subsequent influx of nitrogen (N) regulates water quality in developed regions. However, unlike during the Green Revolution, future N fertilization will be conducted with urea. Rarely used prior to 1960, urea now accounts for >50% of global N fertilizer, is ubiquitous in lakes worldwide, and has potentially detrimental but poorly understood effects on aquatic ecosystems. Given that ~1 billion people currently lack clean water, we seek to develop a rigorous theoretical basis to understand the consequences of these global changes for humans and freshwaters.

我们假设，到2050年，为了养活30亿人口，需要增加农业施肥，这将使土壤中磷(P)饱和，并为随后流入的氮(N)调节发达地区的水质创造条件。然而，与绿色革命时期不同的是，未来的氮肥将使用尿素。尿素在1960年之前很少使用，现在占全球氮肥的50%，在世界各地的湖泊中无处不在，对水生生态系统有潜在的有害影响，但人们对其知之甚少。鉴于目前约有10亿人缺乏清洁水，我们寻求建立一个严谨的理论基础，以了解这些全球变化对人类和淡水的影响。