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Freiburg, Germany

Ruiz-Benito P.,Forest Research Center Instituto Nacional Of Investigacion cnologia Agraria imentaria Cifor Inia | Ruiz-Benito P.,University of Alcala | Ruiz-Benito P.,University of Stirling | Madrigal-Gonzalez J.,University of Alcala | And 7 more authors.
Ecosystems | Year: 2014

European forests have a prominent role in the global carbon cycle and an increase in carbon storage has been consistently reported during the twentieth century. Any further increase in forest carbon storage, however, could be hampered by increases in aridity and extreme climatic events. Here, we use forest inventory data to identify the relative importance of stand structure (stand basal area and mean d.b.h.), mean climate (water availability), and recent climate change (temperature and precipitation anomalies) on forest basal area change during the late twentieth century in three major European biomes. Using linear mixed-effects models we observed that stand structure, mean climate, and recent climatic change strongly interact to modulate basal area change. Although we observed a net increment in stand basal area during the late twentieth century, we found the highest basal area increments in forests with medium stand basal areas and small to medium-sized trees. Stand basal area increases correlated positively with water availability and were enhanced in warmer areas. Recent climatic warming caused an increase in stand basal area, but this increase was offset by water availability. Based on recent trends in basal area change, we conclude that the potential rate of aboveground carbon accumulation in European forests strongly depends on both stand structure and concomitant climate warming, adding weight to suggestions that European carbon stocks may saturate in the near future. © 2014 Springer Science+Business Media New York. Source

Zolciak A.,The Forest Research Institute | Sierota Z.,The Forest Research Institute | Malecka M.,The Forest Research Institute
Biocontrol Science and Technology | Year: 2012

The activity of cellulase, peroxidase, phosphatase and dehydrogenase enzymes, together with the content of protocatechuic and vanillic acids, in samples of Norway spruce wood inoculated with 17 different isolates of Phlebiopsis gigantea was measured. The same isolates were used to compare decay activity in samples of Norway spruce wood after incubation for 3 and 6 months. Significant differences in enzyme activity and phenol production were found between aerial mycelium overgrowing the wood sample and the underlying wood. These differences indicated that the nature of the fungal mycelium appears to change depending on whether it is in contact with wood. After 6 months, highly extensive decomposition of the wood was shown by two British isolates. The results confirm a large difference in P. gigantea inoculum among isolates in natural conditions and reinforce the need for constant evaluation of the most active isolates to use in preparations for biocontrol: a problem for both users and registration bodies. © 2012 Copyright Taylor and Francis Group, LLC. Source

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