Investigating Controls on the Benthic Flux of Nitrogen and Phosphorus from Lake Sediments: A Comparative Ecosystems Approach

这个项目将比较不同湖泊沉积物中底栖生物的氧、碳、硫、氮和磷的化学计量关系。研究人员将使用比较生态系统方法和基于过程的成岩模型来检查控制沉积物中氮和磷再生的因素。他们将研究湖泊中氮和磷的释放是如何在有机质沉积、水化学、沉积物化学和底水氧浓度的梯度中变化的。要检查的数据包括：来自哈伯德布鲁克、北部湖泊和北极LTER站点的湖泊多年数据集；来自约50个温带和北极湖泊的短期数据集；来自几个实验的数据，在完整的沉积物岩心中对沉积物和上覆水化学的碳输入进行了处理；还有两个全湖施肥实验的数据。研究人员将利用这些数据来改进控制淡水沉积物中养分释放的概念和数值模型。这些模型将为湖泊和河口的水质管理提供工具。

9416807 Giblin This project will compare the stoichiometric relationships among benthic fluxes of oxygen, carbon, sulfur, nitrogen and phosphorous from sediments in a variety of lakes. Investigators will use a comparative ecosystem approach and a process-based diagenetic model to examine the factors which control regeneration of nitrogen and phosphorus from sediments. They will examine how the release of nitrogen and phosphorus changes in lakes across gradients of organic matter deposition, water chemistry, sediment chemistry and bottom water oxygen concentration. The data to be examined include: multi-year data sets from Lakes in the Hubbard Brook, Northern Lakes and Arctic LTER sites; shorter term data sets from about 50 temperate and arctic lakes; data from several experiments where carbon inputs to the sediments and overlying water chemistry were manipulated in intact sediment cores; and data from two whole lake fertilization experiments. Investigators will use this data to generate improved conceptual and numerical models of the controls of nutrient release from freshwater sediments. These models will provide tools for the management of water quality in lakes and estuaries.