Temperature sensitivity of soil carbon fractions in boreal forest soil
| Autor: | Mikko Tuomi, Eloni Sonninen, Peter Spetz, Högne Jungner, Pekka Vanhala, Kai Hämäläinen, Hannu Fritze, Kristiina Karhu, Markku Oinonen, Jari Liski, Veikko Kitunen |
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| Rok vydání: | 2010 |
| Předmět: |
010504 meteorology & atmospheric sciences
chemistry.chemical_element Soil science Models Biological 01 natural sciences Trees Carbon cycle Soil respiration Soil Ecology Evolution Behavior and Systematics 0105 earth and related environmental sciences Arctic Regions Ecology Soil organic matter Global warming Temperature Soil classification 04 agricultural and veterinary sciences Soil carbon 15. Life on land Carbon chemistry 13. Climate action Soil water 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Environmental science |
| Zdroj: | Ecology. 91:370-376 |
| ISSN: | 0012-9658 |
| DOI: | 10.1890/09-0478.1 |
| Popis: | 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 (Q10 < 2) to a decadally cycling one (Q10 = 4.2-6.9) but decreases again to a centennially cycling fraction (Q10 = 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. |
| Databáze: | OpenAIRE |
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