Results from free-air CO 2 enrichment (FACE) experiments in temperate climates indicate that the response of forest net primary productivity (NPP) to elevated CO 2 might be highly conserved across a broad range of productivities. In this study, we show that the LPJ-GUESS dynamic vegetation model reproduces the magnitude of the NPP enhancement at temperate forest FACE experiments. A global application of the model suggests that the response found in the experiments might also be representative of the average response of forests globally. However, the predicted NPP enhancement in tropical forests is more than twice as high as in boreal forests, suggesting that currently available FACE results are not applicable to these ecosystems. The modeled geographic pattern is to a large extent driven by the temperature dependence of the relative affinities of the primary assimilation enzyme (Rubisco) for CO 2 and O 2 .

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Impact of site-preparation on soil-surface CO 2 fluxes and litter decomposition in a clear-cut in Sweden Mjöfors K., Strömgren M., Nohrstedt H.-Ö., Gärdenäs A.I. (2015). Impact of site-preparation on soil-surface CO 2 fluxes and litter decomposition in a clear-cut in Sweden. Silva Fennica vol. 49 no. 5 article id 1403. 20 p. Highlights • Disturbances of the soil did not lead to higher CO 2 emissions from the soil. • Heavy mixing of the soil lead to lower CO 2 emissions from the soil. • Buried needles and coarse roots decomposed faster than those on the surface. • Abundance of δ 15 N decreased in needles and roots after site preparation.

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