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- Title
Methane release from stands of water horsetail (Equisetum fluviatile) in a boreal lake.
- Authors
Hyvönen, T.; Ojala, A.; Kankaala, P.; Martikainen, P. J.
- Abstract
Summary 1. Annual and diel variations in methane (CH4) release in stands of Equisetum fluviatile were measured from June to November in Lake Pääjärvi, southern Finland, where E. fluviatile is the dominant emergent macrophyte. An estimate of total annual release of CH4 from stands of E. fluviatile in this lake was also made. Diel variation was measured twice (June and August), whereas measurements for annual variation were performed monthly. The hypothesis that a relationship exists between the productivity of stands and CH4 release was also tested, whereupon net ecosystem exchange (NEE) of CO2 as well as standing stock of E. fluviatile were determined, in addition to simultaneous recordings of air temperature and solar radiation. 2. Seasonal variations in CH4 release were pronounced, with the highest release rate of 813 mg m–2 day–1 measured in July and the lowest 6.5 mg m–2 day–1 in November, when the shoreline was already frozen. 3. Methane release rates were strongly correlated with mean air temperature in the measuring chambers and with total solar radiation. There was no significant correlation between the instantaneous radiation and CH4 release rates. 4. The seasonal patterns of CH4 release and NEE of CO2 resembled each other, except in July when NEE suddenly dropped. The decrease in NEE coincided with the highest CH4 release rate measured and the highest temperature during the measuring period, i.e. 32 °C outside and 37 °C inside the chamber. Excluding this date, daily CH4 release was strongly correlated with NEE (r2 = 0.971). 5. No diel changes in CH4 release rates were detected. In June and August the maximum release rates were 11.4 and 16.8 mg CH4 m–2 h–1, respectively. 6. The...
- Subjects
FINLAND; EQUISETUM; METHANE; PLANT physiology; CIRCADIAN rhythms; CONTROLLED release technology; PHYSIOLOGY
- Publication
Freshwater Biology, 1998, Vol 40, Issue 2, p275
- ISSN
0046-5070
- Publication type
Article
- DOI
10.1046/j.1365-2427.1998.00351.x