Distribution,sources,and burial flux of black carbon in sediment of Daye lake,central China  

作　　者：Changlin Zhan Yongming Han Jiaquan Zhang Shan Liu Hongxia Liu Wensheng Xiao Junji Cao 

机构地区：[1]School of Environmental Science and Engineering,Hubei Key Laboratory of Mine Environmental Pollution Control and Remediation,Hubei Polytechnic University,Huangshi,435003,China [2]Department of Agroecology,Aarhus University,Tjele,8830,Denmark [3]State Key Laboratory of Loess,Institute of Earth Environment,Chinese Academy of Sciences,Xi'an,710061,China [4]School of Human Settlements and Civil Engineering,Xi'an Jiaotong University,Xi'an,710049,China [5]National Observation and Research Station of Regional Ecological Environment Change and Comprehensive Management in the Guanzhong Plain,Xi'an,710061,China [6]Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing,100029,China

出　　处：《International Journal of Sediment Research》2024年第5期750-760,共11页国际泥沙研究（英文版）

基　　金：principally supported by the Natural Science Foundation of Hubei Province(Grant No.2023AFB1048);the Key Project of Hubei Polytechnic University(Grant No.19XJK01Z);the Provincial Natural Science Foundation Innovation and Development Joint Fund Project of Hubei(Grant No.2022CFD049);the National Natural Science Foundation of China(Grant Nos.41991250 and 42221003).

摘　　要：Black carbon(BC),primarily originating from fossil fuel and biomass combustion,holds significance for global carbon cycling,climate change,and human health.Despite a lake's role as a carbon sink,detailed information about BC sedimentary burial flux and sink in its sediment remains insufficiently explored.The current study investigates the distribution,sources,and burial flux of BC and its subtypes(char and soot)in the surface sediment of Daye Lake,the largest lake in Huangshi City,central China.BC concentrations in the sediment ranged from 0.10 to 3.60 mg/g,corresponding to 0.40%–17.02%of organic carbon(OC).Higher values of BC and BC/OC observed in the western region suggest direct terrestrial input via river discharge and surface runoff,influenced by anthropogenic activities.In contrast,variations in char/soot ratios reflect diverse combustion sources and hydrological dynamics in different regions.The indications from BC/OC and char/soot ratios imply that fossil fuel combustion is the predominant sources.The weak correlations between BC and OC suggest that they may come from different sources or undergo different processes that affect their distribution in the lake sediment.However,a stronger correlation was observed between BC and soot,as well as between char and soot,indicating potential similarities in their input pathways.The BC burial flux displays notable variations across the lake,ranging from 0.69 to 24.07 g/m^(2)/yr,with elevated values observed in the western region.The BC sink in the sediments of Daye Lake was estimated to be 0.635 Gg/yr.Though locally small,it significantly contributes to the broader picture of BC burial in Chinese lakes and the global distribution of BC in lake ecosystems.

关 键 词：Black carbon Sediment source Burial flux Daye lake 

分 类 号：TV141[水利工程—水力学及河流动力学]