摘要：Dissolved organic matter (DOM) in glaciers is a highly complex organic mixture and potentially impacts downstream ecosystems and regional carbon cycling through glacier melting and transport. However, the mechanisms behind the temporal variation in the DOM molecular composition of glacier-derived DOM and its impact on downstream ecosystems remain unclear. Using ultra-high-resolution mass spectrometry, we analyzed the spatial and temporal molecular composition of DOM in ice, snow, and runoff from the Qiangyong Glacier on the Tibetan Plateau. Our results revealed that DOM composition in ice and snow was primarily influenced by in-situ microbial communities, with distinct communities driving DOM transformation in each environment. Co-occurrence network analysis identified autochthonous Cyanobacteria as the main contributors to DOM transformation in snow, whereas heterotrophic taxa, including Gammaproteobacteria, Actinobacteriota, and Bacteroidia, played critical roles in ice. In contrast, the DOM composition in glacier runoff was mainly affected by ice and snow. April-snow-derived DOM accounted for 82%–96% of the DOM molecules in the runoff from May to September. However, the contribution of July-ice-derived DOM increased between 50% and 65%, surpassing that of snow-derived DOM, which ranged from 25% to 45% from July to September. These findings reveal that glaciers act as natural filters, transforming DOM into more refractory molecules which are then exported to shape downstream ecological dynamics. This study underscores the critical role of glacial DOM and microbial processes in regional carbon cycles. ? 2024 Elsevier B.V.

ISSN号：0022-1694

卷、期、页：卷652

发表日期：2025-05-01

期刊分区（SCI为中科院分区）：一区

收录情况：SCI（科学引文索引印刷版）,EI（工程索引）,SCIE（科学引文索引网络版）

发表期刊名称：Journal of Hydrology

参与作者：郭泌汐,刘勇勤,刘鹏飞,蔡阮鸿,郑强

第一作者：史权,何晨

论文类型：期刊论文

论文概要：郭泌汐,刘勇勤,刘鹏飞,蔡阮鸿,郑强,史权,何晨，Glacial snow and ice Contribute Differentially to the dissolved organic matter in the runoff of Qiangyong Glacier, Tibetan Plateau，Journal of Hydrology，2025，卷652

论文题目：Glacial snow and ice Contribute Differentially to the dissolved organic matter in the runoff of Qiangyong Glacier, Tibetan Plateau