The Responses of the Biodegradation of Different Dissolved Organic Matter Components to Different
Xiaoqian Zhan 1, 2, Hongyan Bao 1, 2*
1. College of Ocean and Earth Sciences, Xiamen University, China
2. State Key Laboratory of Marine Environmental Science (Xiamen University)
*zhanxiaoqian@stu.xmu.edu.cn
River is one of the most important transport pathway for the dissolved organic matter (DOM) from land to the ocean. DOM played important roles in aquatic system, which could act as a food source for microbes, affect the availability of nutrients and trace metal and the air-sea CO2 flux. Nature DOM is a complex mixture and composed of tens of thousands of molecules. The cycling of different DOM, on one hand, depends on its intrinsic property, e.g., aliphatic organic matter are more easily to be biodegraded, while aromatics are relatively resistant to biodegradation, but prone to photo-bleaching. On the other hand, was affected by the environment, e.g., temperature, availability of nutrients and microbial community. Under the influence of global warming, both the molecular composition of riverine DOM and temperature will change. However, there are very limited studies have examined how the degradation of different DOM components would response to changes to temperature (Mao and Li, 2018). Here we took the Jiulong River Estuary as the research site. Dissolved organic Carbon (DOC), UV-vis spectrum, lignin, amino acids and ultra-high resolution mass spectrometry will be applied to characterize the changes in DOM compositions. Preliminary results show that the rise of temperature can promote the utilization of dissolved organic carbon (DOC) by organisms, reduce the transformation of chromophoric dissolved organic matter (CDOM) and change the properties of DOM.
Keywords: Dissolved Organic Matter, Biodegradation, Climate Warmin
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