Phosphorus Release from Sediments in Aquatic Ecosystems: A Cross-System Study

水生生态系统沉积物中磷的释放：跨系统研究

• 批准号: 8917962
• 负责人: Jonathan Cole
• 金额: $ 24万
• 依托单位: Cary Institute of Ecosystem Studies, Inc.
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-04-01 至 1993-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8917962&HistoricalAwards=false
• 关键词: Phosphorus; Release; Sediments; Aquatic; Ecosystems

Lake sediments, by their ability to retain or release dissolved phosphorus, play a critical role in controlling p- lading to the water column. In the ocean P release can be predicted relatively accurately simply from a knowledge of how much decomposition occurred. Thus, in marine systems post- decompositional factors (sorption, mineral formation, microbial immobilization) are of minor importance in comparison to decomposition. In freshwaters, on the other hand, these post- decompositional factors are of major importance making sediment P release much more difficult to predict. Despite decades of research on sediment P release in freshwaters, and lists of factors that might influence this release in the laboratory, there is essentially no knowledge as to which of these factors are actually important in natural systems; consequently there is limited ability to predict P release. Cole, Caraco, and Likens propose to investigate the controls of P release in both hard and soft-water lakes over a very broad geographic range. They will use a straightforward, in situ, geochemical approach modified from oceanography, to investigate P release both empirically across a large number and range of lake types, and mechanistically in a of suite six lakes that differ dramatically in their P release responses. Preliminary results suggest that: 1) Contrary to standard limnological dogma, oxic versus anoxic conditions explains very little of the enormous natural variation in sediment P release among systems; 2) this variation is best explained by the sulfur content of the system. Cole, Caraco and Likens are very productive and innovative researchers who have provided a unique way to investigate nutrient fluxes. The Institutional support for this research is excellent. The investigators propose a feasible mechanism to explain phosphorus fluxes in freshwater systems. The tests proposed in this research should lead to important information that will impact water management policies.

湖泊沉积物，通过其保留或释放的能力 溶解磷，在控制磷- 把船拖下水 在海洋中， 简单地从知识上相对准确地预测， 发生了大量分解。 因此，在海洋系统中， 分解因素（吸附、矿物形成、微生物 固定化）与 分解 另一方面，在淡水中，这些后- 分解因素是使沉积物P 释放更难以预测。 尽管经过数十年的 淡水沉积物磷释放的研究， 在实验室中可能影响这种释放的因素， 基本上不知道这些因素中的哪一个 实际上在自然系统中很重要，因此， 预测磷释放的能力有限。 科尔，卡拉科，和李肯斯建议调查的控制P 在很宽的水域内， 地理范围。 他们将使用一个简单的，在原地， 海洋地球化学方法，调查P 经验上，在大量的湖泊中， 类型，并在一套六湖，不同的机械 在磷释放反应中的作用。 初步结果 表明：1）与标准湖沼学教条相反， 与缺氧条件的对比， 系统间沉积物磷释放的自然变化; 2）这 变化最好由系统的硫含量来解释。 科尔、卡拉科和利肯斯都非常富有成效和创新精神 研究人员提供了一种独特的方法来研究 养分通量 对这项研究的机构支持是 好极了 调查人员提出了一个可行的机制， 解释淡水系统中的磷通量。 测试 在这项研究中提出的建议应该导致重要的信息 这将影响水资源管理政策。