摘要：Reservoirs are well known as a far-reaching human modification on the functions of natural river networks. However, changes in the chemistry and reactivity of dissolved organic matter (DOM) responding to hydrological management for water retention structures, and its influence on the river carbon cycle, remain poorly understood. Here we show that hydrological management does shape the molecular composition of DOM in the world's largest Three Gorges Reservoir, as revealed by optical spectroscopy and ultrahigh-resolution mass spectrometry. Relatively higher terrestrial input, molecular complexity, isomeric complexity, and environmental stability of DOM were observed during the storage period, whereas the inverse occurred during the drainage period. The results demonstrate that the hydrodynamic processes, which are mainly controlled by water intrusion from mainstream to tributaries, are likely the underlying mechanism controlling DOM chemistry. Integrated with observations from worldwide river reservoirs, the DOM degradation experiments suggest that reservoir hydrological management would enhance DOM mineralization, thereby increase CO2 emission and change the river carbon cycle.
© 2020

ISSN号：0043-1354

卷、期、页：v 187,

发表日期：2020-12-15

收录情况：SCIE（科学引文索引网络版）,EI（工程索引）

发表期刊名称：Water Research

参与作者：何丁,Wang, Kai,Pang, Yu,Li, Penghui,Xiao, Shangbin,孙永革

通讯作者：何晨,Li, Yunyun

第一作者：史权

论文类型：期刊论文

论文概要：何丁,Wang, Kai,Pang, Yu,何晨,Li, Penghui,Li, Yunyun,Xiao, Shangbin,史权,孙永革，Hydrological management constraints on the chemistry of dissolved organic matter in the Three Gorges Reservoir，Water Research，2020，v 187,

论文题目：Hydrological management constraints on the chemistry of dissolved organic matter in the Three Gorges Reservoir