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Methane and carbon dioxide fluxes from a shallow hypereutrophic subtropical Lake in China

Methane and carbon dioxide fluxes from a shallow hypereutrophic subtropical Lake in China
Methane and carbon dioxide fluxes from a shallow hypereutrophic subtropical Lake in China
Up to now, there have been few studies in the annual fluxes of greenhouse gases in lakes of subtropical regions. The fluxes of methane (CH4) and carbon dioxide (CO2) across air–water interface were measured in a shallow, hypereutrophic, subtropical Lake Donghu (China) over a year cycle, using a static chamber technique. During the year, Lake Donghu emitted CH4 and CO2; the average flux of CH4 and CO2 was 23.3±18.6 and 332.3±160.1 mg m?2 d?1, respectively. The fluxes of CH4 and CO2 showed strong seasonal dynamics: CH4 emission rate was highest in summer, remaining low in other seasons, whereas CO2 was adsorbed from the atmosphere in spring and summer, but exhibited a large emission in winter. Annual carbon (C) budget across air–water interface in Lake Donghu was estimated to be 7.52±4.07×108 g. CH4 emission was correlated positively with net primary production (NPP) and temperature, whereas CO2 flux correlated negatively with NPP and temperature; however, there were no significant relationships between the fluxes of CH4 and CO2 and dissolved organic carbon, a significant difference from boreal lakes, indicating that phytoplankton rather than allochthonous matter regulated C dynamics across air–water interface of subtropical lake enriched nutrient content.

methane emission, carbon dioxide flux, npp, temperature, subtropical lake
1352-2310
5532-5540
Xing, Yangping
ab1dc613-403f-4216-9f3e-fc7b06ac776f
Xie, Ping
bf059083-ccc2-464c-9f1f-83ace6e26e04
Yang, Hong
2ea2c94c-8d28-4555-98f9-59b615b0cee7
Ni, Leyi
51f18d39-bd71-41bd-8266-35e1e5e634cc
Wang, Yuesi
ba67e2d6-e498-467d-8c51-854ed49c46d2
Rong, Kewen
efe0f096-3846-4781-8745-22193f0e61cd
Xing, Yangping
ab1dc613-403f-4216-9f3e-fc7b06ac776f
Xie, Ping
bf059083-ccc2-464c-9f1f-83ace6e26e04
Yang, Hong
2ea2c94c-8d28-4555-98f9-59b615b0cee7
Ni, Leyi
51f18d39-bd71-41bd-8266-35e1e5e634cc
Wang, Yuesi
ba67e2d6-e498-467d-8c51-854ed49c46d2
Rong, Kewen
efe0f096-3846-4781-8745-22193f0e61cd

Xing, Yangping, Xie, Ping, Yang, Hong, Ni, Leyi, Wang, Yuesi and Rong, Kewen (2005) Methane and carbon dioxide fluxes from a shallow hypereutrophic subtropical Lake in China. Atmospheric Environment, 39 (30), 5532-5540. (doi:10.1016/j.atmosenv.2005.06.010).

Record type: Article

Abstract

Up to now, there have been few studies in the annual fluxes of greenhouse gases in lakes of subtropical regions. The fluxes of methane (CH4) and carbon dioxide (CO2) across air–water interface were measured in a shallow, hypereutrophic, subtropical Lake Donghu (China) over a year cycle, using a static chamber technique. During the year, Lake Donghu emitted CH4 and CO2; the average flux of CH4 and CO2 was 23.3±18.6 and 332.3±160.1 mg m?2 d?1, respectively. The fluxes of CH4 and CO2 showed strong seasonal dynamics: CH4 emission rate was highest in summer, remaining low in other seasons, whereas CO2 was adsorbed from the atmosphere in spring and summer, but exhibited a large emission in winter. Annual carbon (C) budget across air–water interface in Lake Donghu was estimated to be 7.52±4.07×108 g. CH4 emission was correlated positively with net primary production (NPP) and temperature, whereas CO2 flux correlated negatively with NPP and temperature; however, there were no significant relationships between the fluxes of CH4 and CO2 and dissolved organic carbon, a significant difference from boreal lakes, indicating that phytoplankton rather than allochthonous matter regulated C dynamics across air–water interface of subtropical lake enriched nutrient content.

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More information

Published date: September 2005
Keywords: methane emission, carbon dioxide flux, npp, temperature, subtropical lake

Identifiers

Local EPrints ID: 153567
URI: http://eprints.soton.ac.uk/id/eprint/153567
ISSN: 1352-2310
PURE UUID: ac46b4ef-5fc7-4920-8f06-e0cc70118255

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Date deposited: 18 May 2011 12:55
Last modified: 14 Mar 2024 01:30

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Contributors

Author: Yangping Xing
Author: Ping Xie
Author: Hong Yang
Author: Leyi Ni
Author: Yuesi Wang
Author: Kewen Rong

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