RCEES OpenIR  > 环境纳米技术与健康效应重点实验室
Dark Reduction of Mercury by Microalgae-Associated Aerobic Bacteria in Marine Environments
Zhang, Xiaoyan; Guo, Yingying; Liu, Guangliang; Liu, Yanwei; Song, Maoyong; Shi, Jianbo; Hu, Ligang; Li, Yanbin; Yin, Yongguang; Cai, Yong; Jiang, Guibin
2021-12-19
Source PublicationENVIRONMENTAL SCIENCE & TECHNOLOGY
ISSN1470-160X
Volume130Pages:-
AbstractHeadwater streams, as critical zones due to their proximity to terrestrial sources, emit large quantities of CO2 owing to their higher drainage density of catchments, substantial total areas, and stream lengths. Stream ecosystem metabolism (EM, i.e. photosynthesis and respiration) can significantly affect the in-stream carbon cycle. However, how stream CO2 emissions respond to ecosystem respiration (ER) is still not well known. Here we report in-situ daily observations of headwater stream gross primary production (GPP), ecosystem respiration (ER), isotopic composition of dissolved inorganic carbon (delta C-13(DIC)) and CO2 emissions conducted in five streams in two headwater catchments of the Changjiang River in Southeastern China. The results show that delta C-13(DIC), pCO(2), and CO2 emission rates have significant diel variations. Both the day and night delta C-13(DIC) values were more depleted than the theoretical values in the two catchments, but the nocturnal depletion was greater. The headwater streams have high EM, with an average ER of -1.99 +/- 0.82 g C m(-2) d(-1) and GPP of 1.52 +/- 0.84 g C m(-)(2 )d(-1) in the two catchments. ER increases with DOC concentration but decreases with water discharge. The nocturnal pCO(2) (3885 +/- 2959 mu atm) was significantly higher than in daytime (2525 +/- 2221 mu atm). The higher nocturnal CO2 emission rate (225 +/- 165 mg C m(-2 )h(-1)) was about 42 % higher than in daytime. DOC uptake velocity (V-f) was 0.46 +/- 0.14 m d(-1), and increased with lower water discharge and lower catchment-scale DOC yield. DOC loss rate (0 was 0.96 +/- 1.25 d(-1) and declined exponentially with higher water discharge and catchment-scale DOC yield. Moreover, the removal fraction of DOC via ER was about 0.32 +/- 0.14, contributing to 31 +/- 16 % of the CO2 flux in streams. The re-estimated annual CO2 flux was about 14.62 +/- 4.99 Tg C yr(-1 )from the Changjiang headwater streams network. This study emphasizes the necessity of incorporating the effects of EM into the river network's CO2 emissions and the importance of the headwater streams to river carbon cycling.
Department环境纳米技术与健康效应重点实验室
KeywordCO2 Ecosystem respiration Gross primary production Headwater streams In-stream DOC removal efficiency Uptake velocity
Document Type期刊论文
Identifierhttps://ir.rcees.ac.cn/handle/311016/46835
Collection环境纳米技术与健康效应重点实验室
Affiliation1.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, Lab Environm Nanotechnol & Hlth Effect, Beijing 100085, Peoples R China
2.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Environm Chem & Ecotoxicol, Beijing 100085, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
4.Florida Int Univ, Dept Chem & Biochem, Miami, FL 33199 USA
5.Ocean Univ China, Minist Educ, Key Lab Marine Chem Theory & Technol, Qingdao 266100, Peoples R China
6.[Li, Yanbin
7.Ocean Univ China, Coll Chem & Chem Engn, Qingdao 266100, Peoples R China
8.Chinese Acad Sci, Sch Environm, Hangzhou Inst Adv Study, UCAS, Hangzhou 310024, Peoples R China
Recommended Citation
GB/T 7714
Zhang, Xiaoyan,Guo, Yingying,Liu, Guangliang,et al. Dark Reduction of Mercury by Microalgae-Associated Aerobic Bacteria in Marine Environments[J]. ENVIRONMENTAL SCIENCE & TECHNOLOGY,2021,130:-.
APA Zhang, Xiaoyan.,Guo, Yingying.,Liu, Guangliang.,Liu, Yanwei.,Song, Maoyong.,...&Jiang, Guibin.(2021).Dark Reduction of Mercury by Microalgae-Associated Aerobic Bacteria in Marine Environments.ENVIRONMENTAL SCIENCE & TECHNOLOGY,130,-.
MLA Zhang, Xiaoyan,et al."Dark Reduction of Mercury by Microalgae-Associated Aerobic Bacteria in Marine Environments".ENVIRONMENTAL SCIENCE & TECHNOLOGY 130(2021):-.
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