![The change of gaseous carbon fluxes following the switch of dominant producers from macrophytes to algae in a shallow subtropical lake of China [An article from: Atmospheric Environment]](https://www.ebooknetworking.net/books/B00/0PC/bigB000PC0A3U.jpg)
The change of gaseous carbon fluxes following the switch of dominant producers from macrophytes to algae in a shallow subtropical lake of China [An article from: Atmospheric Environment]
Book Details
PublisherElsevier
ISBN / ASINB000PC0A3U
ISBN-13978B000PC0A33
AvailabilityAvailable for download now
Sales Rank99,999,999
MarketplaceUnited States 🇺🇸
Description
This digital document is a journal article from Atmospheric Environment, published by Elsevier in 2006. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.
Description:
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 (CH"4) and carbon dioxide (CO"2)) across air-water interface in three sites with different vegetation covers and compositions were studied and compared. CH"4 emissions from three sites were 0.62+/-0.36, 0.70+/-0.36, and 1.31+/-0.57mgm^-^2h^-^1, respectively. Correlation analysis showed that macrophytes, rather than phytoplankton, directly positively affected CH"4 emission. CO"2 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+/-26.8mgm^-^2h^-^1, respectively. There were an evident trend that the larger macrophyte biomass, the lower CO"2 emissions. Correlation analysis showed that in different sites, dominant plant controlled CO"2 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.
Description:
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 (CH"4) and carbon dioxide (CO"2)) across air-water interface in three sites with different vegetation covers and compositions were studied and compared. CH"4 emissions from three sites were 0.62+/-0.36, 0.70+/-0.36, and 1.31+/-0.57mgm^-^2h^-^1, respectively. Correlation analysis showed that macrophytes, rather than phytoplankton, directly positively affected CH"4 emission. CO"2 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+/-26.8mgm^-^2h^-^1, respectively. There were an evident trend that the larger macrophyte biomass, the lower CO"2 emissions. Correlation analysis showed that in different sites, dominant plant controlled CO"2 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.
