文献类型：期刊文献

英文题名：Concentration and biodegradability of dissolved organic carbon derived from soils: A global perspective

作者：Liu, Futing[1,2] Wang, Dong[1,2] Zhang, Beibei[3] Huang, Jin[2]

第一作者：刘富庭

通信作者：Wang, D[1]

机构：[1]Chinese Acad Forestry, Res Inst Nat Protected Area, Beijing 100091, Peoples R China;[2]Chinese Acad Forestry, Res Inst Forestry, Key Lab Tree Breeding & Cultivat State Forestry &, Beijing 100091, Peoples R China;[3]Chinese Acad Forestry, Res Inst Forest Ecol Environm & Protect, Key Lab Forest Ecol & Environm State Forestry & G, Beijing 100091, Peoples R China

年份：2021

卷号：754

外文期刊名：SCIENCE OF THE TOTAL ENVIRONMENT

收录：;EI(收录号：20204009293117);Scopus(收录号：2-s2.0-85091782029);WOS:【SCI-EXPANDED(收录号:WOS:000593907600005)】；

基金：We gratefully acknowledge the editor and four anonymous reviewers for their insightful comments on this manuscript. We also thank Dan Kou and Jinzhi Ding who provided technical assistance and suggestion with data analysis. This work was supported by the National Non-profit Institute Research Grant of Chinese Academy of Forestry (CAFYBB2020MA008) and the Tree Breeding and Cultivation Special Fund of Key Laboratory, Research Institute of Forestry, Chinese Academy of Forestry (2019Q00239).

语种：英文

外文关键词：Dissolved organic carbon; Biodegradability; Soil; Leachate; Meta-analysis

摘要：Dissolved organic carbon (DOC), as active and mobile carbon, plays a critical role in terrestrial and aquatic ecosystems. However, it remains unclear how the concentration and biodegradability of soil-derived DOC (extracted from pore water or soil leachates) vary over a global scale and what determines the variations in DOC concentration and biodegradability. Here we addressed this issue by synthesizing the dataset involved in 121 sites from 39 literatures worldwide, and analyzed the patterns and drivers of DOC concentration and biodegradability. Our results showed that the DOC concentration in either pore water or soil leachates varied considerably, with mean values of 33.2 mg L-1 in pore water and 213.5 mg kg(-1) in soil leachates, respectively. Mean annual precipitation (MAP) was the dominant control on the variability in soil-derived DOC concentration. Our results also revealed that the biodegradability of DOC in pore water was significantly lower than that in soil leachates, with the means of 16.5% versus 28.7%, respectively. Specific UV absorbance (SUVA(254), a parameter used for evaluating dissolved aromatic carbon content) was the primary indicator predicting the spatial variation in DOC biodegradability, whereas MAP exerted limited effects on DOC biodegradability. These results demonstrate the high biodegradability of soil-derived DOC, highlighting its crucial role in the global carbon cycle under climate change. (C) 2020 Elsevier B.V. All rights reserved.