店埠河农业小流域水体溶解性有机质源解析与迁移转化研究

The dynamics of dissolved organic matter (DOM) in watershed are complex. Variations in DOM characteristics and sources in stream are believed to be mainly driven by both hydrology and associated runoff of terrestrial DOM in different Landscape element. However，Confirmation and quantification of different DOM sources and transition mechanism are still incomplete. This research program treats the Dianbu River watershed as the study area. Stable carbon isotope technique, three-dimensional fluorescence spectroscopy, parallel factor analysis, water chemical analysis and geographic information technology would be applied to analyze the concentration, fluorescence components and stable carbon isotopic signatures of DOM in different source and their transports and transition mechanism in the source-ditch-river system. Analyze the “quality” and “quantity” of terrestrial DOM along the riparian zone-river system, and reveals the biogeochemical process of DOM from terrestrial ecosystems to aquatic ecosystems under different hydrologic flowpaths. In the current research, fluorescence components and stable carbon isotopic signatures of DOM could also be analyzed to interpret and clarify the temporal and spatial variations, and then the relative contributions of different DOM sources could be traced. Applying landscape ecology theory, this research could provide a novel idea which could quantification of DOM sources and transition mechanism.

溶解性有机质（DOM）在流域范围内的动力学特征极其复杂，河流水文及不同景观格局下陆源DOM的地表径流被认为是水体DOM来源和特征变化的主要驱动力。然而，查清水体DOM的来源及其贡献率，明确DOM在不同景观格局间的迁移转化规律，是一个备受关注却未能解决的问题。本项目拟以店埠河农业小流域为研究区域，通过稳定碳同位素技术和三维荧光光谱技术，分析不同来源DOM的浓度、荧光组分及δ13C-DOM特征值，重点探究其在来源–沟渠–河道系统中与传输介质相互作用所表现的迁移转化特征；分析沿河岸带–河道方向陆源DOM的“质”和“量”，揭示不同水文路径条件下，DOM在不同景观要素下的迁移转化过程；解析店埠河流域DOM的来源及贡献率。结合景观生态学理论，本研究成果可为探索水体DOM来源与迁移转化机制开拓新的思路。

溶解性有机质（DOM）在流域范围内的动力学特征极其复杂，河流水文及不同景观格局下陆源DOM的地表径流被认为是水体DOM来源和特征变化的主要驱动力。然而，查清水体DOM的来源及其贡献率，明确DOM在不同景观格局间的迁移转化规律，是一个备受关注却未能解决的问题。本项目拟以店埠河农业小流域为研究区域，通过稳定碳同位素技术和三维荧光光谱技术，分析不同来源DOM的浓度、荧光组分及δ13C-DOM特征值，重点探究其在来源–沟渠–河道系统中与传输介质相互作用所表现的迁移转化特征；分析沿河岸带–河道方向陆源DOM的“质”和“量”，揭示不同水文路径条件下，DOM在不同景观要素下的迁移转化过程；解析店埠河流域DOM的来源及贡献率。结合景观生态学理论，本研究成果可为探索水体DOM来源与迁移转化机制开拓新的思路。