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- Title
Midsummer spatial variation in methane efflux from stands of littoral vegetation in a boreal meso-eutrophic lake.
- Authors
Kankaala, Paula; Mäkelä, Suvi; Bergström, Irina; Huitu, Eeva; Käki, Tiina; Ojala, Anne; Rantakari, Miitta; Kortelainen, Pirkko; Arvola, Lauri
- Abstract
Summary 1. Spatial variation of methane (CH[sub 4] ) efflux from the littoral zone of a meso-eutrophic boreal lake was studied with a closed-chamber technique for three summer days in 22 vegetation stands, consisting of three emergent and three floating-leaved species. 2. Between-species differences in CH[sub 4] emission were significant. The highest emissions were measured from the emergent Phragmites australis stands (0.5–1.7 mmol m[sup -2] h[sup -1] ), followed by Schoenoplectus lacustris > Equisetum fluviatile > Nuphar lutea > Sparganium gramineum > Potamogeton natans . Within-species differences between stands were not significant. 3. In P. australis stands, the stand-specific mean CH[sub 4] emission was significantly correlated with solar radiation, probably indicating the role of effective pressurised ventilation on CH[sub 4] fluxes. The proportion of net primary production emitted as CH[sub 4] was significantly higher in P. australis stands (7.4%) than in stands of S. lacustris and E. fluviatile (both 0.5%). 4. In N. lutea stands, CH[sub 4] efflux was negatively correlated with the mean fetch and positively with the percentage cover of leaves on the water surface. There were no differences in CH[sub 4] efflux between intact N. lutea leaves and those grazed by coleopteran Galerucella nymphaeae . In S. graminaeum and P. natans stands, CH[sub 4] effluxes were not related to any of the measured environmental variables. 5. For all vegetation stands, the biomass above water level explained about 60% of the observed spatial variation in CH[sub 4] emission, indicating the important role of plants as gas conduits and producers of substrates for methanogens in the anoxic sediment.
- Subjects
PHRAGMITES; TAIGAS; DESTRATIFICATION of lakes; METHANE
- Publication
Freshwater Biology, 2003, Vol 48, Issue 9, p1617
- ISSN
0046-5070
- Publication type
Article
- DOI
10.1046/j.1365-2427.2003.01113.x