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The change of gaseous carbon fluxes following the switch of dominant producers from macrophytes to algae in a shallow subtropical lake of China

The change of gaseous carbon fluxes following the switch of dominant producers from macrophytes to algae in a shallow subtropical lake of China
The change of gaseous carbon fluxes following the switch of dominant producers from macrophytes to algae in a shallow subtropical lake of China
Successions of lake ecosystems from clear-water, macrophyte-rich conditions into turbid states with abundant phytoplankton have taken place in many shallow lakes in China. However, little is know about the change of carbon fluxes in lakes during such processes. We conducted a case study in Lake Biandantang to investigate the change of carbon fluxes during such a regime shift. Dissolved aquatic carbon and gaseous carbon (methane (CH4) and carbon dioxide (CO2)) across air–water interface in three sites with different vegetation covers and compositions were studied and compared. CH4 emissions from three sites were 0.62±0.36, 0.70±0.36, and 1.31±0.57 mg m?2 h?1, respectively. Correlation analysis showed that macrophytes, rather than phytoplankton, directly positively affected CH4 emission. CO2 fluxes of three sites in Lake Biandantang were significantly different, and the average values were 77.8±20.4, 52.2±14.1 and 3.6±26.8 mg m?2 h?1, respectively. There were an evident trend that the larger macrophyte biomass, the lower CO2 emissions. Correlation analysis showed that in different sites, dominant plant controlled CO2 flux across air–water interface. In a year cycle, the percents of gaseous carbon release from lake accounting for net primary production were significantly different (from 39.3% to 2.8%), indicating that with the decline of macrophytes and regime shift, the lake will be a larger carbon source to the atmosphere.
methane, carbon dioxide, macrophyte, phytoplankton
1352-2310
8034-8043
Xing, Yangping
ab1dc613-403f-4216-9f3e-fc7b06ac776f
Xie, Ping
bf059083-ccc2-464c-9f1f-83ace6e26e04
Yang, Hong
2ea2c94c-8d28-4555-98f9-59b615b0cee7
Wu, Aiping
85fefaee-9141-4d56-97a4-90dc9edeb69e
Ni, Leyi
51f18d39-bd71-41bd-8266-35e1e5e634cc
Xing, Yangping
ab1dc613-403f-4216-9f3e-fc7b06ac776f
Xie, Ping
bf059083-ccc2-464c-9f1f-83ace6e26e04
Yang, Hong
2ea2c94c-8d28-4555-98f9-59b615b0cee7
Wu, Aiping
85fefaee-9141-4d56-97a4-90dc9edeb69e
Ni, Leyi
51f18d39-bd71-41bd-8266-35e1e5e634cc

Xing, Yangping, Xie, Ping, Yang, Hong, Wu, Aiping and Ni, Leyi (2006) The change of gaseous carbon fluxes following the switch of dominant producers from macrophytes to algae in a shallow subtropical lake of China. Atmospheric Environment, 40 (40), 8034-8043. (doi:10.1016/j.atmosenv.2006.05.033).

Record type: Article

Abstract

Successions of lake ecosystems from clear-water, macrophyte-rich conditions into turbid states with abundant phytoplankton have taken place in many shallow lakes in China. However, little is know about the change of carbon fluxes in lakes during such processes. We conducted a case study in Lake Biandantang to investigate the change of carbon fluxes during such a regime shift. Dissolved aquatic carbon and gaseous carbon (methane (CH4) and carbon dioxide (CO2)) across air–water interface in three sites with different vegetation covers and compositions were studied and compared. CH4 emissions from three sites were 0.62±0.36, 0.70±0.36, and 1.31±0.57 mg m?2 h?1, respectively. Correlation analysis showed that macrophytes, rather than phytoplankton, directly positively affected CH4 emission. CO2 fluxes of three sites in Lake Biandantang were significantly different, and the average values were 77.8±20.4, 52.2±14.1 and 3.6±26.8 mg m?2 h?1, respectively. There were an evident trend that the larger macrophyte biomass, the lower CO2 emissions. Correlation analysis showed that in different sites, dominant plant controlled CO2 flux across air–water interface. In a year cycle, the percents of gaseous carbon release from lake accounting for net primary production were significantly different (from 39.3% to 2.8%), indicating that with the decline of macrophytes and regime shift, the lake will be a larger carbon source to the atmosphere.

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More information

Published date: December 2006
Keywords: methane, carbon dioxide, macrophyte, phytoplankton

Identifiers

Local EPrints ID: 153565
URI: http://eprints.soton.ac.uk/id/eprint/153565
ISSN: 1352-2310
PURE UUID: 01ce7165-e975-41e1-8dc2-4e3f0a27607d

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Date deposited: 18 May 2011 10:52
Last modified: 14 Mar 2024 01:30

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Contributors

Author: Yangping Xing
Author: Ping Xie
Author: Hong Yang
Author: Aiping Wu
Author: Leyi Ni

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