Lode, Elve
- Department of Soil and Environment, Swedish University of Agricultural Sciences
- Tallinn University
Abstract
Analyses of 50-year (1962-2011) monthly air temperature and precipitation data indicated substantial climate change in the locations of two raised bogs (Linnusaare and Mannikjarve) in central-east Estonia. During recent years the cross-year winter air temperature increased by 1.7 degrees C, while the cold-season precipitation increased by 4 mm. The fluctuation amplitude of temperature and precipitation values decreased. Snow depth proved to be the most sensitive variable to winter warming, followed by groundwater levels together with mean and maximum soil frosts. Long-term groundwater levels on the domes of the bogs and in the forested/treed lagg areas were 0.3-0.4 m and 0.4-0.8 m below the soil surface, respectively. Warming caused changes in groundwater level amplitude of 3-22 cm in the bog domes and 3-14 cm in the forested lagg zones. The lowest groundwater levels in ridge-pool ecotopes at Mannikjarve rose by 6-10 cm (i.e. these ecotopes became wetter); but the incidence of low groundwater levels increased in most ecotopes, indicating a more general trend towards drier conditions in the bog.
Keywords
mire water level; peat frost; peatland; snow cover; winter warming
Published in
Mires and Peat
2017, volume: 19, article number: 15
Publisher: INT PEAT SOC
SLU Authors
Global goals (SDG)
SDG6 Clean water and sanitation
SDG13 Climate action
UKÄ Subject classification
Climate Science
Publication identifier
- DOI: https://doi.org/10.19189/MaP.2016.OMB.255
Permanent link to this page (URI)
https://res.slu.se/id/publ/93079