Dissertation Research: Effects of Dissolved Organic Carbon on Nitrification Rates in Aquatic Ecosystems

98-01090兰伯蒂/施特劳斯：溶解有机碳对水生生态系统硝化速率的影响氮可以以多种形式存在于水生生态系统中，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。一种称为硝化作用的转化是一种细菌过程，在这个过程中，铵被转化为硝酸盐。硝化作用很重要，因为最终产物硝酸盐会造成湖泊和溪流的营养污染，导致水生植物过度生长。饮用水中高浓度的硝酸盐也与几个人类健康问题有关。我们的初步实验表明，有机碳在水中的溶解数量可能控制硝化速率。我们将利用硝化作用最严重的河流和湖泊沉积物进行几个实验，以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，因为其他细菌将竞争硝化细菌的铵。

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.