Dissertation Research: Role of Ecological Stoichiometry in Plant-Herbivore Interactions: A Test in Stream Ecosystems

论文研究：生态化学计量在植物-草食动物相互作用中的作用：溪流生态系统的测试

• 批准号: 9801249
• 负责人: Gary Lamberti
• 金额: $ 0.45万
• 依托单位: University of Notre Dame
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-05-01 至 2000-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9801249&HistoricalAwards=false
• 关键词: Dissertation; Research; Role; Ecological; Stoichiometry

98-01090 Lamberti/Strauss DDIG: Effects of dissolved organic carbon on nitrification rates in aquatic ecosystems Nitrogen can be present in many forms in aquatic ecosystems and the health of these ecosystems is dependent, in part, on natural transformations between the different forms. One transformation, termed nitrification, is a bacterial process in which ammonium is converted to nitrate. Nitrification is important because the end product, nitrate, can cause nutrient pollution in lakes and streams leading to excessive growth of aquatic plants. High concentrations of nitrate in drinking water also have been linked to several human health problems. Our preliminary experiments suggest that the quantity of organic carbon dissolved in water may control nitrification rates. We will conduct several experiments using stream and lake sediments, the site of most nitrification, to investigate the influence of organic carbon on nitrification rates. Our basic hypothesis is that increasing quantity and quality of organic carbon will reduce nitrification because other bacteria will outcompete nitrifying bacteria for ammonium.

在水生生态系统中，氮可以以多种形式存在，而这些生态系统的健康在一定程度上取决于不同形式之间的自然转化。一种转化称为硝化作用，是一种将氨转化为硝酸盐的细菌过程。硝化作用很重要，因为最终产物硝酸盐会导致湖泊和溪流中的营养物污染，导致水生植物过度生长。饮用水中高浓度的硝酸盐也与若干人类健康问题有关。我们的初步实验表明，溶解在水中的有机碳的数量可能控制硝化速率。我们将以河流和湖泊沉积物为实验对象，研究有机碳对硝化速率的影响。我们的基本假设是，增加有机碳的数量和质量将减少硝化作用，因为其他细菌将比硝化细菌争夺铵。