Flux and source of dissolved inorganic carbon in a headwater stream in a subtropical plantation catchment

doi:10.1016/j.jhydrol.2021.126511

	Flux and source of dissolved inorganic carbon in a headwater stream in a subtropical plantation catchment
	Song Xianwei 1,2; Lyu Sidan 2; Sun Kun 2; Gao Yang 1,2; Wen Xuefa 1,2,3
刊名	JOURNAL OF HYDROLOGY
	2021-09-01
卷号	600 页码:10
关键词	Dissolved inorganic carbon Carbon source Headwater stream Soil CO2 Carbonate weathering
ISSN号	0022-1694
DOI	10.1016/j.jhydrol.2021.126511
通讯作者	Lyu Sidan(lvsidan@igsnrr.ac.cn) ; Wen Xuefa(wenxf@igsnrr.ac.cn)
英文摘要	Dissolved inorganic carbon (DIC) in headwater streams significantly contributes to the riverine CO2 emission to the atmosphere and oceans. However, understanding of the sources and mechanisms of DIC generation and mass balances of DIC flux in headwater streams at the scale of catchments remain poor and add to uncertainty in regional carbon estimates. In this study, the input and output of water fluxes and their chemical and isotopic compositions in a headwater stream were investigated from 2016 to 2019 in a subtropical plantation catchment. Our results showed that the headwater stream catchment experienced a net carbon loss of 262-4352 kg C km(-2) yr(-1) based on the water balance of annual precipitation, evapotranspiration, headwater stream and groundwater discharge, and change in soil water storage. The headwater stream exhibited comparable DIC flux (3561 +/- 933 kg C km(-2) yr(-1)) and higher DIC concentration (7.91 +/- 3.13 mg L-1) than precipitation (3662 +/- 682 kg C km(-2) yr(-1) and 2.63 +/- 1.22 mg L-1 , respectively). Differences in DIC concentration between precipitation and headwater stream were mainly controlled by soil CO2 dissolution, carbonate weathering, and their synergistic effects. Relative contributions to DIC fluxes in this headwater stream were 25.3 +/- 5.2% by precipitation, 47.3 +/- 6.2% by soil biological CO2 , and 27.4 +/- 7.3% by carbonate weathering. Our results indicated that the DIC-generating processes may result in an underestimation of soil biological CO2 efflux to the atmosphere. Further, soil carbonate weathering, and a net carbon loss at the scale of catchments may be overlooked in acid soils.
资助项目	National Natural Science Foundation of China[41830860] ; National Natural Science Foundation of China[41807167] ; National Natural Science Foundation of China[42077302]
WOS关键词	SOIL CARBON ; ISOTOPE FRACTIONATION ; CO2 CONSUMPTION ; GASEOUS CARBON ; ORGANIC-MATTER ; CRITICAL ZONE ; PRECIPITATION ; TERRESTRIAL ; WATER ; TRANSPORT
WOS研究方向	Engineering ; Geology ; Water Resources
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000685246900019
资助机构	National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/165317]
专题	中国科学院地理科学与资源研究所
通讯作者	Lyu Sidan; Wen Xuefa
作者单位	1.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 101408, Peoples R China 2.Chinese Acad Sci, Key Lab Ecosyst Network Observat & Modeling, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China 3.Univ Chinese Acad Sci, Yanshan Earth Crit Zone & Surface Fluxes Res Stn, Beijing 101408, Peoples R China
推荐引用方式 GB/T 7714	Song Xianwei,Lyu Sidan,Sun Kun,et al. Flux and source of dissolved inorganic carbon in a headwater stream in a subtropical plantation catchment[J]. JOURNAL OF HYDROLOGY,2021,600:10.
APA	Song Xianwei,Lyu Sidan,Sun Kun,Gao Yang,&Wen Xuefa.(2021).Flux and source of dissolved inorganic carbon in a headwater stream in a subtropical plantation catchment.JOURNAL OF HYDROLOGY,600,10.
MLA	Song Xianwei,et al."Flux and source of dissolved inorganic carbon in a headwater stream in a subtropical plantation catchment".JOURNAL OF HYDROLOGY 600(2021):10.