Ecosystemic and biospheric interactions with carbon cycle

Peñuelas J, Filella I, Estiarte M, Ogaya R, Llusià J, Sardans J, Jump A, Carnicer J, Rico L, Garbulsky M, Coll M, Díaz de Quijano M, Seco R, Rivas-Ubach A, Kefauver S, Barbeta A, Achoategui A, Mejía-Chang M, Gallardo A, Farre G, Fernández M, Terradas J (2012) Ecosystemic and biospheric interactions with carbon cycle. In Carbon dioxide budget: processes and tendencies symposium. Universitat Politècnica de Catalunya, May 23-25.

Mediterranean shrubland and forest responses to experimental drought. Drought and ohter extreme weather conditions in terrestrial ecosystems

Estiarte M, Peñuelas J, Ogaya R (2012) Mediterranean shrubland and forest responses to experimental drought. Drought and ohter extreme weather conditions in terrestrial ecosystems. CLIMMANI European Science foundation. Dubrovnic. June 6-8.

Experimental drought experiments in Garraf and Prades. Results of long-term field experiments.

Estiarte M, Peñuelas J, Ogaya R, Barbeta A (2012) Experimental drought experiments in Garraf and Prades. Results of long-term field experiments. In: Drought and other extreme weather conditions in terrestrial ecosystems, CLIMANI workshop. Dubrovnik, Croatia. June 6-8.

Summer season and long-term drought increase the richness of bacteria and fungi in the foliar phyllosphere of Quercus ilex in a mixed Mediterranean forest

Peñuelas J., Rico L., Ogaya R., Jump A.S., Terradas J. (2012) Summer season and long-term drought increase the richness of bacteria and fungi in the foliar phyllosphere of Quercus ilex in a mixed Mediterranean forest. Plant Biology. 14: 565-575.
Enllaç
Doi: 10.1111/j.1438-8677.2011.00532.x

Resum:

We explored the changes in richness, diversity and evenness of epiphytic (on the leaf surface) and endophytic (within leaf tissues) bacteria and fungi in the foliar phyllosphere of Quercus ilex, the dominant tree species of Mediterranean forests. Bacteria and fungi were assessed during ontogenic development of the leaves, from the wet spring to the dry summer season in control plots and in plots subjected to drought conditions mimicking those projected for future decades. Our aim was to monitor succession in microbiota during the colonisation of plant leaves and its response to climate change. Ontogeny and seasonality exerted a strong influence on richness and diversity of the microbial phyllosphere community, which decreased in summer in the whole leaf and increased in summer in the epiphytic phyllosphere. Drought precluded the decrease in whole leaf phyllosphere diversity and increased the rise in the epiphytic phyllosphere. Both whole leaf bacterial and fungal richness decreased with the decrease in physiological activity and productivity of the summer season in control trees. As expected, the richness of epiphytic bacteria and fungi increased in summer after increasing time of colonisation. Under summer dry conditions, there was a positive relationship between TRF (terminal restriction fragments) richness and drought, both for whole leaf and epiphytic phyllosphere, and especially for fungal communities. These results demonstrate that changes in climate are likely to significantly alter microbial abundance and composition of the phyllosphere. Given the diverse functions and large number of phyllospheric microbes, the potential functional implications of such community shifts warrant exploration. © 2012 German Botanical Society and The Royal Botanical Society of the Netherlands.

Llegeix més

Eleven years of experimental drought in Prades Holm Oak forest.

Ogaya R, Peñuelas J (2012) Eleven years of experimental drought in Prades Holm Oak forest. International workshop of MOTIVE project. Poblet (Catalonia, Spain). November, 8 and 9.

Urgent need for a common metric to make precipitation manipulation experiments comparable

Vicca S., Gilgen A.K., Camino Serrano M., Dreesen F.E., Dukes J.S., Estiarte M., Gray S.B., Guidolotti G., Hoeppner S.S., Leakey A.D.B., Ogaya R., Ort D.R., Ostrogovic M.Z., Rambal S., Sardans J., Schmitt M., Siebers M., van der Linden L., van Straaten O., Granier A. (2012) Urgent need for a common metric to make precipitation manipulation experiments comparable. New Phytologist. 195: 518-522.
Enllaç
Doi: 10.1111/j.1469-8137.2012.04224.x

Resum:

[No abstract available]

Llegeix més

Reduced tree health and seedling production in fragmented Fagus sylvatica forest patches in the Montseny Mountains (NE Spain)

Barbeta A., Peñuelas J., Ogaya R., Jump A.S. (2011) Reduced tree health and seedling production in fragmented Fagus sylvatica forest patches in the Montseny Mountains (NE Spain). Forest Ecology and Management. 261: 2029-2037.
Enllaç
Doi: 10.1016/j.foreco.2011.02.029

Resum:

Habitat fragmentation results in smaller and more isolated populations that may be at higher risk of extirpation or further decline in comparison with their more continuously distributed progenitors. Risks to fragmented populations have frequently been considered from the perspective of population genetics, however, disruption of normal plant demography may be an equal or greater threat to population persistence. We compared demographic performance and tree health in continuous and fragmented forest plots with similar tree size structure and local climatic and physiographic conditions in order to determine if fragments are characterized by poor health and reproduction. We found that beech forest fragments showed lower seedling density, more tree crown damage and also higher percentage of dead trees. However, mortality of juveniles in the youngest age class was substantially lower in fragments such that long-term population structure remained similar between the two forest types. If reduced mortality compensates for reduced seedling establishment, as our data suggest, then fragmented populations should show greater long-term persistence than would be predicted based on comparison of young age cohorts alone. However, despite such demographic compensation, the decreased health of adult trees may pose an increasing future threat to the fragmented populations. Our results demonstrate the importance of integrating demographic patterns over long time periods and not relying on single year or cohort comparisons and may partly explain population genetic differences previously reported for the same populations. © 2011 Elsevier B.V.

Llegeix més

The world's largest database on wild plants is published.

Sardans J, Peñuelas J, Estiarte M, Ogaya R, Llusià J (2011) The world's largest database on wild plants is published. UABdivulga 09/2011.

Llebot E. (ed). Impactes, vulnerabilitat i retroalimentacions climàtiques als ecosistemes terrestres catalans. Segon informe sobre el canvi climàtic a Catalunya.

Peñuelas J, Filella I, Estiarte M, Ogaya R, Llusià J, Sardans J, Jump A, Curiel J, Carnicer J, Rutishauser T, Rico L, Keenan T, Garbulsky M, Coll M, Diaz de Quijano M, Seco R, Rivas-Ubach A, Silva J, Boada M, Stefanescu C, Lloret F, Terradas J (2011) Llebot E. (ed). Impactes, vulnerabilitat i retroalimentacions climàtiques als ecosistemes terrestres catalans. Segon informe sobre el canvi climàtic a Catalunya. Institut d'Estudis Catalans i Generalitat de Catalunya. Barcelona, pp. 373-407.

L'increment de CO2 no ha fet augmentar el creixement dels arbres.

Peñuelas J, Cabadell J, Ogaya R (2011) L'increment de CO2 no ha fet augmentar el creixement dels arbres. UABdivulga 10/2011.

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