湖甲基与CONUS上游的营养物质有关
Matthew Dietrich1,2, Heather E Golden2, Jay R Christensen2
1Oak Ridge Institute for Science and Education, Oak Ridge, Tennessee, 37830, USA.
概括
河流提供营养,增加了美国下游湖泊的藻类生物量 (Chlorophyll-a). 这项研究将河流中的和与湖联系起来,有助于预测有害的藻类繁殖.
科学领域:
- 环境科学 环境科学
- 生态生态学 生态生态学
- 水的质量 水的质量
背景情况:
- 叶绿素-a (Chl-a) 表示藻类生物质和表面水中的潜在有害藻类繁殖.
- 过多的和营养素往往会导致肥胖和增加Chl-a的产生.
- 关于河流营养物质与下游湖泊Chl-a关系的大型流域规模的研究有限.
研究的目的:
- 为了研究河流营养度和下游湖泊Chl-a度在整个美国 (CONUS) 之间的联系.
- 为了确定河流营养是否对连接下游湖泊的Chl-a水平在流域规模上有显著的影响.
- 使用关键环境变量开发营养和Chl-a度的预测模型.
主要方法:
- 分析了河流中总 (TN) 和总 (TP) 以及CONUS.254个流域下游湖泊中Chl-a之间的关系.
- 采用空间物流回归模型来预测河流TN,TP和湖泊Chl-a的高低度.
- 确定了影响这些营养-湖 Chl-a 联系的关键解释变量.
主要成果:
- 在上游河流TN和TP度和下游湖泊Chl-a度之间发现了显著的积极关系.
- 节的模型 (2-3个变量) 准确地预测了营养和Chl-a分类 (77%-86%的准确性,AUC = 0.83-0.91).
- 预测变量包括植被类型,排水,排水,温度和输入.
结论:
- 河流是重要的营养来源,可以提高下游湖泊中的Chl-a度.
- 空间模型有效地预测了CONUS流域范围内的营养素和Chl-a水平.
- 这些发现支持了河流营养供应驱动湖泊藻类生物质的假设.
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