Denitrification in Tidal River-Marsh Ecosystems

9630532 Kana 反硝化过程（硝酸盐生物转化为氮气）是去除水中溶解硝酸盐的主要机制。 地表和地下沃茨的硝酸盐污染是一个日益严重的世界性问题。 本计画利用高精度气体分析新技术，研究河流与河口沉积物中的反硝化作用。 由主要研究人员开发的新方法的优点包括准确和明确地测量脱氮的最终产物以及快速和廉价的样品分析。 本研究将探讨温度、营养盐浓度、沉积物结构等环境因子对反硝化过程的影响。 本项目将致力于更好地了解反硝化作用作为河流和河口氮营养物负荷去除机制的相对重要性。 该提案已提交给环境地球化学和生物地球化学征集NSF 96-2。 所描述的项目正在由地球科学，环境生物学和国际计划的部门联合支持。

9630532 Kana The process of denitrification (Biological conversion of nitrate to nitrogen gas) is a major mechanism for removing dissolved nitrate from water. Nitrate contamination of surface and ground waters is a growing problem worldwide. This project uses a new technique of high precision gas analysis to study denitrification in riverine and estuarine sediments. Advantages of the new method, developed by the principal investigators, include accurate and unambiguous measurement of the end product of denitrification and rapid and inexpensive analysis of samples. The research ill evaluate the effects of environmental factors including temperature, nutrient concentrations, and sediment structure on the denitrification process. This project will work towards a better understanding of the relative importance of denitrification as a removal mechanism for nitrogen nutrient loading in rivers and estuaries. This proposal was submitted to the Environmental Geochemistry and Biogeochemistry solicitation NSF 96-2. The project described is being jointly supported by the Divisions of Earth Sciences, Environmental Biology, and International Programs.