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Browsing by Author "Karhu, Kristiina"
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Heterotrophic soil respiration-Comparison of different models describing its temperature dependence
Tuomi, Mikko; Vanhala, Pekka; Karhu, Kristiina; Fritze, Hannu; Liski, Jari (2008-02-24)Several models are used to describe the temperature dependence of heterotrophic soil respiration. Six such models are examined here in detail against incubation measurements from different sources. These models are compared ... -
Impacts of organic amendments on carbon stocks of an agricultural soil - Comparison of model-simulations to measurements
Karhu, Kristiina; Gärdenäs, Annemieke I.; Heikkinen, Jaakko; Vanhala, Pekka; Tuomi, Mikko; Liski, Jari (2012-11-01)Organic amendments such as straw, green manure or farmyard manure are used to mitigate the soil carbon (C) losses from cultivated soils. We investigated the role of various organic amendments with different C quality for ... -
Old soil carbon is more temperature sensitive than the young in an agricultural field
Vanhala, Pekka; Karhu, Kristiina; Tuomi, Mikko; Sonninen, Eloni; Jungner, Högne; Fritze, Hannu; Liski, Jari (2007-11-01)Changes in the carbon stock of soil in response to climate change would significantly affect the atmospheric carbon dioxide concentration and consequently climate. The isotopes of carbon provide a means to study the ... -
Temperature sensitivity of soil carbon fractions in boreal forest soil
Karhu, Kristiina; Fritze, Hannu; Hämäläinen, Kai; Vanhala, Pekka; Jungner, Högne; Oinonen, Markku; Sonninen, Eloni; Tuomi, Mikko; Spetz, Peter; Kitunen, Veikko; Liski, Jari (2010-02-01)Feedback to climate warming from the carbon balance of terrestrial ecosystems depends critically on the temperature sensitivity of soil organic carbon (SOC) decomposition. Still, the temperature sensitivity is not known ... -
Temperature sensitivity of soil organic matter decomposition in southern and northern areas of the boreal forest zone
Vanhala, Pekka; Karhu, Kristiina; Tuomi, Mikko; Björklöf, Katarina; Fritze, Hannu; Liski, Jari (2008-07-01)Much effort has been made to improve understanding of factors controlling the temperature dependence of soil organic matter (SOM) decomposition. The question of how soils formed in different geographical locations and ... -
Transplantation of organic surface horizons of boreal soils into warmer regions alters microbiology but not the temperature sensitivity of decomposition
Vanhala, Pekka; Karhu, Kristiina; Tuomi, Mikko; Björklöf, Katarina; Fritze, Hannu; Hyvärinen, Hasse; Liski, Jari (2009-12-16)Changes in soil carbon, the largest terrestrial carbon pool, are critical for the global carbon cycle, atmospheric CO2 levels and climate. Climate warming is predicted to be most pronounced in the northern regions and ...