文献类型：期刊文献

英文题名：Dissolved organic carbon concentration and biodegradability across the global rivers: A meta-analysis

作者：Liu, Futing[] Wang, Dong[1]

第一作者：刘富庭

通信作者：Wang, D[1]

机构：[1]Chinese Acad Forestry, Inst Forest Ecol, Key Lab Forest Ecol & Environm Natl Forestry & Gra, Beijing 100091, Peoples R China; Chinese Acad Forestry, Res Inst Forestry, Key Lab Tree Breeding & Cultivat State Forestry &, Beijing 100091, Peoples R China

年份：2022

卷号：818

外文期刊名：SCIENCE OF THE TOTAL ENVIRONMENT

收录：;EI(收录号：20214811252461);Scopus(收录号：2-s2.0-85120040286);WOS:【SCI-EXPANDED(收录号:WOS:000789647500009)】；

基金：This work was supported by the Fundamental Research Foundation of Chinese Academy of Forestry (CAFYBB2020MA008) and the Special Foundation of Key Laboratory of Tree Breeding and Cultivation, Research Institute of Forestry, Chinese Academy of Forestry (ZDRIF201906).

语种：英文

外文关键词：Dissolved organic carbon; Biodegradability; Aquatic ecosystems; River; Stream; Meta-analysis

摘要：Riverine dissolved organic carbon (DOC) exerts a vital role in the global carbon cycle. Although substantial studies have explored DOC dynamics in aquatic ecosystems, it remains unknown about the patterns and drivers of riverine DOC concentration and biodegradability at the global scale. Here, by synthesizing 396 data points from 42 published literatures worldwide, we explored the spatial variations and controls of riverine DOC concentration and biodegradability. Our results revealed that the DOC concentration varied largely across the global rivers, with an average concentration of 10.4 mg L-1. The variations of DOC concentration were influenced by mean annual precipitation, vegetation type, soil type, permafrost degradation and river order. Furthermore, our results illustrated that the riverine DOC also had high biodegradability, showing an average of 16.4% loss within less than 90 days. The biodegradability of DOC was dominantly regulated by inorganic nutrients and DOC composition, but the controlling factors exhibited significant differences between small streams and large rivers. For small streams, DOC composition was the primary driver influencing DOC biodegradability, while for large rivers, nitrogen availability became the dominant factor affecting DOC biodegradability. This study highlights the high concentration and biodegradability of riverine DOC, which could exert an important role in the feedbacks between the global carbon cycle and climate warming.