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        Temperature sensitivity of soil carbon fractions in boreal forest soil

        Author
        Karhu, Kristiina
        Fritze, Hannu
        Hämäläinen, Kai
        Vanhala, Pekka
        Jungner, Högne
        Oinonen, Markku
        Sonninen, Eloni
        Tuomi, Mikko
        Spetz, Peter
        Kitunen, Veikko
        Liski, Jari
        Attention
        2299/17704
        Abstract
        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 for the majority of the SOC, which is tens or hundreds of years old. This old fraction is paradoxically concluded to be more, less, or equally sensitive compared to the younger fraction. Here, we present results that explain these inconsistencies. We show that the temperature sensitivity of decomposition increases remarkably from the youngest annually cycling fraction (Qio < 2) to a decadally cycling one (Qio = 4.2-6.9) but decreases again to a centennially cycling fraction (Qio = 2.4-2.8) in boreal forest soil. Compared to the method used for current global estimates (temperature sensitivity of all SOC equal to that of the total heterotrophic soil respiration), the soils studied will lose 30-45% more carbon in response to climate warming during the next few decades, if there is no change in carbon input. Carbon input, derivative of plant productivity, would have to increase by 100-120%, as compared to the earlier estimated 70-80%), in order to compensate for the accelerated decomposition.
        Publication date
        2010-02-01
        Published in
        Fungal Ecology
        Published version
        https://doi.org/10.1890/09-0478.1
        Other links
        http://hdl.handle.net/2299/17704
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