With the linkage between dissolved organic matter (DOM) and the characteristics of natural ecosystem assessed extensively, the properties of DOM in reservoirs, the typical human interrupted ecosystems, have been focused on in recent years, which is critical for the understanding of human impacts on watershed ecosystems and carbon cycling. This study aims to analyze the effect of hydrological management on the DOM chemistry and organic carbon burial in Daning River tributary of the world's largest Three Gorges Reservoir (TGR). Based on the application of a combined approach including bulk geochemical analyses, optical spectroscopy, and ultrahigh-resolution Fourier transform ion cyclotron resonance mass spectrometry, various sources of DOM (terrestrial, anthropogenic, and autochthonous sources) were revealed. An increasing trend of terrestrial and recalcitrant DOM was observed along the upstream to downstream transect of Daning River tributary, which was mainly caused by the water intrusion with a higher terrestrial and recalcitrant signature from mainstream to tributary resulted from hydrological management of TGR. Integrated with the analysis of sedimentary organic matter in Daning River tributary in the past decade (after the construction of TGR), our work suggests that organic carbon burial in the reservoir could be enhanced by hydrological management-induced variation in DOM chemistry. Further studies are needed to better constrain the effects of damming reservoirs on carbon cycling considering their booming all over the world.

随着溶解有机物（DOM）与自然生态系统特征之间的联系得到了广泛评估，近年来，人们关注的是典型人类间断生态系统-水库中DOM的特性，这对于理解人类对自然环境的影响至关重要。流域生态系统和碳循环。这项研究旨在分析水文管理对世界上最大的三峡水库（TGR）大宁河支流DOM化学和有机碳埋藏的影响。基于包括整体地球化学分析，光谱学和超高分辨率傅里叶变换离子回旋共振质谱的组合方法的应用，揭示了各种DOM来源（陆地，人为和自生来源）。沿大宁河支流上游到下游断面，陆，and难DOM呈增加趋势，这主要是由于TGR的水文管理使从主流到支流的陆，signature难签名较高。结合过去十年（TGR建成后）大宁河支流的沉积有机质分析，我们的工作表明，水文管理引起的DOM化学变化可以增强储层中的有机碳埋藏。考虑到全球范围内的兴旺发展，有必要进一步研究以更好地限制大坝储层对碳循环的影响。这主要是由于TGR的水文管理造成了从主流到支流的陆上和it难签名较高的水入侵。结合过去十年（TGR建成后）大宁河支流的沉积有机质分析，我们的工作表明，水文管理引起的DOM化学变化可以增强储层中的有机碳埋藏。考虑到全球范围内的兴旺发展，有必要进一步研究以更好地限制大坝储层对碳循环的影响。这主要是由于TGR的水文管理造成了从主流到支流的陆上和it难签名较高的水入侵。结合过去十年（TGR建成后）大宁河支流的沉积有机质分析，我们的工作表明，水文管理引起的DOM化学变化可以增强储层中的有机碳埋藏。考虑到全球范围内的兴旺发展，有必要进一步研究以更好地限制大坝储层对碳循环的影响。结合过去十年（TGR建成后）大宁河支流的沉积有机质分析，我们的工作表明，水文管理引起的DOM化学变化可以增强储层中的有机碳埋藏。考虑到全球范围内的兴旺发展，有必要进一步研究以更好地限制大坝储层对碳循环的影响。结合过去十年（TGR建成后）大宁河支流的沉积有机质分析，我们的工作表明，水文管理引起的DOM化学变化可以增强储层中的有机碳埋藏。考虑到全球范围内的兴旺发展，有必要进一步研究以更好地限制大坝储层对碳循环的影响。