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DISSERTATION RESEARCH Temperature and Nutrient Control of Cyanobacterial Nitrogen Fixation in Subalpine Drainages: a mesocosm Experiment

论文研究亚高山排水系统中蓝藻固氮的温度和养分控制：中生态实验

基本信息

批准号：
0412081
负责人：
Wayne Wurtsbaugh
金额：
$ 1.09万
依托单位：
Utah State University
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2004
资助国家：
美国
起止时间：
2004-06-15 至 2005-11-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=0412081&HistoricalAwards=false
关键词：
DISSERTATION RESEARCH Temperature Nutrient Control

项目摘要

Nitrogen is an essential nutrient for algae and other aquatic plants. Some algae, called cyanobacteria, can use nitrogen from the atmosphere in a process called nitrogen fixation. However, we know very little about where or even if nitrogen fixation occurs in undisturbed watersheds such as those found in wilderness areas of the Sawtooth Mountains (ID). In these watersheds, temperature and nutrient (nitrogen and phosphorus) concentrations may interact to control rates and location of nitrogen fixation. Understanding how these factors control nitrogen fixation is particularly important as global warming increases water temperatures and human disturbances create water pollution. During my first three years of research I focused on the location and nutrient control of nitrogen fixation in Sawtooth Mountain lakes and streams. I now propose to use stream-side experiments to test how temperature and nutrients influence nitrogen fixation rates. Cyanobacteria responses will be measured after 3, 21, and 42 days to examine both short-term and long-term responses to nutrient and temperature alterations. This experiment will provide insight into how global warming may affect nitrogen fixation in aquatic ecosystems. As part of this project, public presentations about the effects of temperature on aquatic ecosystems will be made at Forest Service campfire lectures and as an educational web-based poster directed at high-school students.

氮是藻类和其他水生植物的必需营养素。一些藻类，称为蓝藻，可以在一个称为固氮的过程中使用大气中的氮。然而，我们知道的很少，甚至如果固氮发生在未受干扰的流域，如那些发现在锯齿山（ID）的荒野地区。在这些流域中，温度和养分（氮和磷）浓度可能相互作用以控制固氮的速率和位置。了解这些因素如何控制固氮是特别重要的，因为全球变暖增加水温和人类干扰造成水污染。在我最初三年的研究中，我专注于锯齿山湖泊和溪流中固氮的位置和养分控制。我现在建议使用流侧实验来测试温度和养分如何影响固氮率。蓝藻的反应将在3天，21天和42天后进行测量，以检查对营养和温度变化的短期和长期反应。这项实验将提供深入了解全球变暖如何影响水生生态系统中的固氮作用。作为该项目的一部分，将在林务局篝火讲座上公开介绍温度对水生生态系统的影响，并作为面向高中生的教育性网络海报。