Dissertation Research: Controls on Carbon Cycling in Freshwater Pelagic Ecosystems: New Insights Using Natural Abundance Oxygen Isotopes

DDIG：淡水浮游生态系统中碳循环的控制：使用天然丰度氧同位素的新见解虽然我们对生态系统净生产（光合作用减去呼吸作用）的理解是可靠的，但科学家们一直无法直接测量光合作用和呼吸作用的速率。 进行这项研究的研究人员已经开发出一种更准确地测量这些比率的方法。这项研究将采用围隔实验和湖泊调查，以检查光合作用，呼吸和碳循环在湖泊中的速率。特别是，研究人员将研究磷富集、光可用性和溶解有机碳供应在调节这些速率方面的相对重要性。 这项研究将提高我们对淡水浮游生态系统功能控制的理解，并为这些重要资源的未来管理提供见解。

DDIG: Controls on carbon cycling in freshwater pelagic ecosystems: New insights using natural abundance oxygen isotopesWhile our understanding of net ecosystem production (photosynthesis minus respiration) is robust, scientists have been unable to measure rates of photosynthesis and respiration directly. The investigators performing this research have developed a way to measure these rates more accurately. This research will employ a mesocosm experiment and a lake survey to examine rates of photosynthesis, respiration, and carbon cycling in lakes. In particular, the researchers will examine the relative importance of phosphorus enrichment, light availability, and dissolved organic carbon supply in regulating these rates. This research will improve our understanding of controls on the functioning of freshwater pelagic ecosystems as well as provide insight into the future management of these important resources.