TEMPORAL AND SPATIAL VARIATION IN METHANE EMISSIONS FROM A FLOODED TRANSGRESSION SHORE OF A BOREAL LAKE
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dc.contributor.author | Kankaala P. | |
dc.contributor.author | Ojala A. | |
dc.contributor.author | Kaki T. | |
dc.date.accessioned | 2022-07-17T00:41:46Z | |
dc.date.available | 2022-07-17T00:41:46Z | |
dc.date.issued | 2004 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=6618440 | |
dc.identifier.citation | Biogeochemistry, 2004, 68, 3, 297-311 | |
dc.identifier.issn | 0168-2563 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/38176 | |
dc.description.abstract | Variation of CH4 emissions over a three-year period was studied in a reed-dominated (Phragmites australis) littoral transect of a boreal lake undergoing shoreline displacement due to postglacial rebound. The seasonal variation in plant-mediated CH4 emissions during open-water periods was significantly correlated with sediment temperature. The highest plant-mediated emission rates (up to 2050 mg CH4 m-2 d-1) were found in the outermost reed zone, where culms of the previous growing seasons had accumulated and free-floating plants grew on the decomposing culms. In reed zones closer to the shoreline as well as in mixed stands of reed and cattail, the maximum daily rates were usually > 500 mg CH4 m-2 d-1. The total plant-mediated CH4 emission during the open-water period was significantly correlated with the seasonal maximum of green shoot biomass. This relationship was strongest in the continuously flooded (water depth > 25 cm) outermost zones. In this area, emissions through ebullition were of greatest importance and could exceed plant-mediated emissions. In general, total emissions of the open-water periods varied from ca. 20 to 50 g CH4 m-2 a-1, but in the outermost reed zone, the plant-mediated emissions could be as high as 123 g CH4 m-2 a-1; ebullition emissions from this zone reached > 100 g CH4 m-2 a-1. The proportion of CH4 released in winter was usually < 10% of annual emissions. Emissions of CH4 were higher in this flooded transgression shore the than those measured in boreal peatlands, but the role of ancient carbon stores as a substrate supply compared with recent anthropogenic eutrophication is unknown. | |
dc.subject | BOREAL LAKE | |
dc.subject | METHANE EMISSION | |
dc.subject | PHRAGMITES AUSTRALIS | |
dc.subject | TRANSGRESSION SHORE | |
dc.subject | TYPHA LATIFOLIA | |
dc.title | TEMPORAL AND SPATIAL VARIATION IN METHANE EMISSIONS FROM A FLOODED TRANSGRESSION SHORE OF A BOREAL LAKE | |
dc.type | Статья |
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