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Continuous Measurements of Temporal and Vertical Variations in Atmospheric CO2 and Its delta C-13 in and above a Subtropical Plantation
Chen, Changhua1; Wen, Xuefa1,2,3; Wang, Jingyuan1; Guo, Qingjun1,2
2021-05-01
Source PublicationFORESTS
Volume12Issue:5Pages:14
Corresponding AuthorWang, Jingyuan(wangjy@igsnrr.ac.cn)
AbstractAtmospheric CO2 dynamics in forest ecosystems are dependent on interactions between photosynthesis, respiration, and turbulent mixing processes; however, the carbon isotopic composition of atmospheric CO2 (delta C-13) is not well established due to limited measurement reports. In this study, a seven-inlet profile system with a Picarro analyzer was developed to conduct continuous in situ measurements of CO2 and its delta C-13 in and above a subtropical plantation from 2015 to 2017. Results showed that ecosystem CO2 concentration was the lowest in the afternoon and reached its peak at dawn, which mirrored variations in its delta C-13 in and above the canopy. Inverse seasonal variations were apparent between CO2 and its delta C-13 in and above the canopy, and delta C-13 was positive during the peak growing season and negative at other times. Diel and seasonal variations in ecosystem CO2 and its delta C-13 were mainly affected by the vapor pressure deficit, followed by photosynthetic active radiation, temperature, and the enhanced vegetation index in and above the canopy; however, environmental and physiological factors had reverse or no effects near the forest floor. Nocturnal gradients of vertical variations in atmospheric CO2 and its delta C-13 were greater than diurnal variations due to weak turbulent mixing under more stable atmospheric conditions overnight. These results implicate that photosynthesis and respiration dominated CO2 dynamics above the canopy, while CO2 recycling by photosynthesis and turbulent mixing changed CO2 dynamics in the canopy.
Keywordstable carbon isotope CO2 climate– vegetation feedbacks atmospheric stability photosynthesis respiration forest carbon sink
DOI10.3390/f12050584
WOS KeywordCARBON-ISOTOPE DISCRIMINATION ; ECOSYSTEM RESPIRATION ; STABLE-ISOTOPE ; RESPIRED CO2 ; FOREST ; SOIL ; DYNAMICS ; EXCHANGE ; DIOXIDE ; RATIOS
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[31901133] ; National Natural Science Foundation of China[41830860] ; National Natural Science Foundation of China[42077302] ; China Postdoctoral Science Foundation[2019M660779]
Funding OrganizationNational Natural Science Foundation of China ; China Postdoctoral Science Foundation
WOS Research AreaForestry
WOS SubjectForestry
WOS IDWOS:000653923500001
PublisherMDPI
Citation statistics
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/162594
Collection中国科学院地理科学与资源研究所
Corresponding AuthorWang, Jingyuan
Affiliation1.Chinese Acad Sci, Ctr Environm Remediat, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modelling, Beijing 100101, Peoples R China
2.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100190, Peoples R China
3.Univ Chinese Acad Sci, Yanshan Earth Crit Zone & Surface Fluxes Res Stn, Beijing 101408, Peoples R China
Recommended Citation
GB/T 7714
Chen, Changhua,Wen, Xuefa,Wang, Jingyuan,et al. Continuous Measurements of Temporal and Vertical Variations in Atmospheric CO2 and Its delta C-13 in and above a Subtropical Plantation[J]. FORESTS,2021,12(5):14.
APA Chen, Changhua,Wen, Xuefa,Wang, Jingyuan,&Guo, Qingjun.(2021).Continuous Measurements of Temporal and Vertical Variations in Atmospheric CO2 and Its delta C-13 in and above a Subtropical Plantation.FORESTS,12(5),14.
MLA Chen, Changhua,et al."Continuous Measurements of Temporal and Vertical Variations in Atmospheric CO2 and Its delta C-13 in and above a Subtropical Plantation".FORESTS 12.5(2021):14.
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