Artikkelit jotka sisältää sanan 'Mire development'
Talviaikainen hiilivuo boreaaliselta suosukkessiogradientilta seuraa kesäaikaisen hiilidynamiikan vaihtelua.
English title: Winter carbon losses from a boreal mire succession sequence follow summertime patterns in carbon dynamics.
Original keywords:
sukkessio;
suon kehitys;
primaarisoistuminen;
hiilidioksidi;
metaani;
lumikerros;
Siikajoki;
maankohoamisrannikko
English keywords:
Carbon dioxide;
methane;
Mire development;
land uplift coast;
mire succession;
primary paludification;
snow pack;
Siikajoki
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Tekijät
Although carbon (C) gas exchange during the summer largely determines the annual C balance of mires, the wintertime fluxes cannot be ignored. Decomposition continues as long as the soil is not frozen and a proportion of the gases produced during summer are also released during winter. We measured carbon dioxide (CO2) and methane (CH4) fluxes along a successional mire sequence during two winters following growing seasons with divergent weather conditions. We studied the successional trends in wintertime C release in boreal mires, and quantified the contribution of wintertime C fluxes to annual fluxes. Wintertime CO2 and CH4 fluxes from the successional mire sequence were related to the flux rates during the previous summer. Average winter CO2 release along the successional sequence varied between 19.5 and 44.9 g CO2-C m–2 winter–1(6-months), and accounted for 8–14% of the annual CO2 release. There was no clear successional trend in CO2 fluxes. Average winter CH4 release along the successional sequence varied between 0.20 and 7.29 CH4-C g m–2 winter–1(6-months).The winter CH4 fluxes accounted for up to 38% of the annual CH4 emissions. Occasional CH4 uptake was detected at the younger successional stages during winter following the dry summer, while after the wet summer all sites emitted CH4. In general, most of the winter C losses were composed of CO2.
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Leppälä,
Mirva Leppälä, Finnish Forest Research Institute, FIN-91500 Muhos, Finland. Current address: Metsähallitus, Natural Heritage Services Ostrobothnia, BOX 81, FI-90101 Oulu, Finland, email: mirva.leppala@metsa.fi
Sähköposti:
ei.tietoa@nn.oo
- Laine, Sähköposti: ei.tietoa@nn.oo
- Tuittila, Sähköposti: ei.tietoa@nn.oo
Latvian suot.
English title: Mires in Latvia.
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Both minerotrophic (fens and transitional mires) and ombrotrophic (raised bogs) mires
occur in Latvia. Distribution of mires and diversity of mire vegetation are determined
by geology of area, origin of mires and climatic differences between coastal and continental
parts of Latvia. Fens started to develop in the early Holocene in the Preboreal
10 000 years BP. Later, during the Atlantic many fens transformed into transitional
mires and gradually into raised bogs. Today Latvian mires are represented by all these
types and they cover 4.9% of the country. Mires are protected in the North Vidzeme
Biosphere Reserve, National Parks (Slitere, Kemeri and Gauja), Strict Nature Reserves
(TeiEi, Krustkalni and Gripi), Nature parks and 140 nature reserves, as well as in protected
landscape areas.
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Pakalne,
Department of Botany and Ecology, university of Latvia, Kronvalda Boulevard 4, LV-1586, Riga, Latvia
Sähköposti:
ei.tietoa@nn.oo
- Kalnina, Sähköposti: ei.tietoa@nn.oo
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