Water Level Fluctuations and Internal Eutrophication in Lakes and Wetlands

湖泊和湿地的水位波动和内部富营养化

• 批准号: 0743402
• 负责人: Stephen Hamilton
• 金额: --
• 依托单位: Michigan State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-05-01 至 2011-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0743402&HistoricalAwards=false
• 关键词: Water; Level; Fluctuations; Internal; Eutrophication

Release of phosphorus (P) from aquatic sediments is critical in regulating the growth of algae and aquatic plants. Sediment release of P is referred to as internal eutrophication because of the pivotal role of P as a limiting nutrient. Recent research has suggested that internal eutrophication involves complex biogeochemical processes and is accelerated by moderate concentrations of sulfate, a pollutant on the increase in many areas. Yet interestingly, the effects of sulfate can be reversed if sediments are allowed to dry periodically. This research seeks to understand the biogeochemistry of sediment P release, with an emphasis on how it is affected by water level stabilization vs. fluctuation. New linkages between sediment P release, the forms of iron and sulfur in sediments, and the role of periodic desiccation will be explored, focusing on a lake system regulated by a weir.This research has broader impacts because internal eutrophication is fundamental to managing lakes and wetlands: it can cause eutrophication, stymie restoration efforts, and delay recovery after nutrient loading is reduced. Water level regimes are altered by a myriad of human actions including impoundments, augmentation wells, agricultural land drainage, water withdrawals, and climate change. It is important to understand how these changes in water level regimes impact eutrophication, and thus affect ecosystem services and values provided by lakes and wetlands.

水体沉积物中磷的释放是调节藻类和水生植物生长的关键。 沉积物中磷的释放被称为内部富营养化，因为磷作为一种限制性营养盐的关键作用。 最近的研究表明，内部富营养化涉及复杂的生物地球化学过程，并因中等浓度的硫酸盐而加速，硫酸盐是一种在许多地区不断增加的污染物。 然而，有趣的是，如果沉积物被允许定期干燥，硫酸盐的影响可以逆转。 本研究旨在了解沉积物磷释放的生态地球化学，重点是如何影响水位稳定与波动。 沉积物磷释放，沉积物中的铁和硫的形式，以及周期性干燥的作用之间的新的联系将被探索，重点是由weirs.This研究的湖泊系统具有更广泛的影响，因为内部富营养化是管理湖泊和湿地的基础：它可以导致富营养化，阻碍恢复工作，并延迟恢复后，营养负荷减少。 水位变化是由无数的人类活动，包括蓄水，增加威尔斯，农田排水，取水，气候变化。 重要的是要了解水位状况的这些变化如何影响富营养化，从而影响湖泊和湿地提供的生态系统服务和价值。