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Estimating NOx removal capacity of urban trees using stable isotope method: A case study of Beijing, China
Gong, Cheng; Xian, Chaofan; Cui, Bowen; He, Guojin; Wei, Mingyue; Zhang, Zhaoming; Ouyang, Zhiyun
2021-10-01
Source PublicationENVIRONMENTAL POLLUTION
ISSN0147-6513
Volume224Pages:-
AbstractNew observations and updated models now suggest terrestrial ecosystems are net sink of atmospheric mercury (Hg), and the critical constrained process to identify the strengths of terrestrial sink is whether the large amount of Hg stored in vegetation originates from the soil as well as from the atmosphere. In this study, field open top chambers (OTCs) experiments reveal that rice plant can assimilate gaseous elemental mercury (GEM, Hg-0) from the atmosphere through stomata, and Hg concentrations in rice leaves, upper and bottom stalks and grains increased with Hg-0 levels in air, showing significantly quadratic linear relationships. Coupling field stable isotope soil amendment experiments, atmospheric source of Hg in rice plant is quantified with more than 90% of Hg accumulation in rice aboveground biomass from air and approximately 80% of rice root Hg from soil. Furthermore, elevated atmospheric carbon dioxide (CO2) exposure led to lower Hg concentration in rice tissues through reduction stomatal conductance of rice leaf, and subsequently impact the capacity of Hg storage in rice aboveground parts from the atmosphere. The findings from experiments provide a foundation for future quantification of atmospheric sink of crops in local and larger scales and comprehensive evaluation atmosphere terrestrial processes and exposure risks in the global Hg cycling.
Department城市与区域生态国家重点实验室
KeywordMercury Elevated carbon dioxide Rice tissues Field open top chambers (OTCs) Stable isotopic Hg soil amendment
Document Type期刊论文
Identifierhttps://ir.rcees.ac.cn/handle/311016/46728
Collection城市与区域生态国家重点实验室
Affiliation1.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Urban & Reg Ecol, Beijing 100085, Peoples R China
2.Chinese Acad Sci, Aerosp Informat Res Inst, Beijing 100094, Peoples R China
Recommended Citation
GB/T 7714
Gong, Cheng,Xian, Chaofan,Cui, Bowen,et al. Estimating NOx removal capacity of urban trees using stable isotope method: A case study of Beijing, China[J]. ENVIRONMENTAL POLLUTION,2021,224:-.
APA Gong, Cheng.,Xian, Chaofan.,Cui, Bowen.,He, Guojin.,Wei, Mingyue.,...&Ouyang, Zhiyun.(2021).Estimating NOx removal capacity of urban trees using stable isotope method: A case study of Beijing, China.ENVIRONMENTAL POLLUTION,224,-.
MLA Gong, Cheng,et al."Estimating NOx removal capacity of urban trees using stable isotope method: A case study of Beijing, China".ENVIRONMENTAL POLLUTION 224(2021):-.
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