RPG: Carbohydrate Dynamics in Aquatic Systems: Sources and Biological Cycling

9408127白蛋白碳水化合物是天然水体中溶解有机碳的主要成分。预计研究的目的将是从生物地球化学和营养动力学(例如微生物环)的角度研究碳水化合物在水生系统中的动态。生物地球化学角度涉及比较不同来源物质(陆生和水生植物、大型藻类、浮游植物、浮游动物、细菌)的碳水化合物组成，以确定是否存在生物化学上一致的组成差异，这将是天然水域DOC来源的有用指标。到目前为止，在这个问题上只做了有限的工作，很大程度上是因为检测单个碳水化合物的分析难度很大。拟议的工作将寻求扩大以前对来源物质的碳水化合物组成的研究，并通过将碳水化合物特征信号作为地球化学示踪剂与现场样品中的测量结果进行比较，来测试使用碳水化合物信号作为地球化学示踪剂的效用。如果这种方法被证明是卓有成效的，它将提高对各种DOC来源对自然水域的相对贡献的理解。

9408127 Alber Carbohydrates are a major component of the dissolved organic carbon (DOC) in natural waters. The purpose of the projected research will be to examine carbohydrate dynamics in aquatic systems from both a biogeochemical and a trophodynamic (e.g., microbial loop) perspective. The biogeochemical perspective involves comparing the carbohydrate composition of various source materials (terrestrial and aquatic plants, macroalgae, phytoplankton, zooplankton, bacteria) to determine whether there are biochemically consistent compositional differences that would be useful indicators of sources of DOC in natural waters. There has been only a limited amount of work to date on this question, in large part because of the analytic difficulty of detecting individual carbohydrates. The proposed work will seek to extend previous studies on the carbohydrate composition of source material and to test the utility of using carbohydrate signatures as geochemical tracers by comparing them to measurements made in field samples. If this approach proves fruitful, it will improve understanding of the relative contribution of various sources of DOC to natural waters.