Atles d’espècies llenyoses dels bosos de Catalunya.

Lloret F, Vayreda J, Terradas J (2010) Atles d’espècies llenyoses dels bosos de Catalunya. Notícies de la Institució Catalana d’Història Natural, gener-febrer: 1-2.

Embornals a: Segon informe sobre el canvi climàtic a Catalunya. J. Llebot.

C. Gracia, S Sabaté, J. Vayreda,T Sebastià, R Savé, M Alonso i Montse Vidal. (2010) Embornals a: Segon informe sobre el canvi climàtic a Catalunya. J. Llebot. Institut d'Estudis Catalans i Generalitat de Catalunya. 1152 pp. ISBN 978-84-9965-027-2.

Pilot study on harmonising national forest inventories in Europe.

Requardt A, Siwe R, Riedel T, Köhl M, Tröltzsch K, Varis S, Travaglini D, Corona P, Sanchez A, Vayreda J, Gracia C, Camia A, San Miguel J (2010) Pilot study on harmonising national forest inventories in Europe. European Commission. Joint Research Centre 136 pp.

Structural and climatic determinants of demographic rates of Scots pine forests across the Iberian Peninsula.

Vilà-Cabrera A, Martínez-Vilalta J, Vayreda J, Retana J (2010) Structural and climatic determinants of demographic rates of Scots pine forests across the Iberian Peninsula. Ecological Applications 21: 1162-1172, doi: 10.1890/10-0647.1.

Interspecific variation in functional traits, not climatic differences among species ranges, determines demographic rates across 44 temperate and Mediterranean tree species

Martínez-Vilalta J., Mencuccini M., Vayreda J., Retana J. (2010) Interspecific variation in functional traits, not climatic differences among species ranges, determines demographic rates across 44 temperate and Mediterranean tree species. Journal of Ecology. 98: 1462-1475.
Enllaç
Doi: 10.1111/j.1365-2745.2010.01718.x

Resum:

Surprisingly little is known about the relationship between functional traits and demographic rates of tree species under field conditions, particularly for non-tropical species. We studied the interspecific relationship between key functional traits (wood density (WD), maximum tree height, specific leaf area, nitrogen (N) content of leaves, leaf size and seed mass), demographic rates (relative growth rate (RGR) and mortality rate (MR)) and climatic niche for the 44 most abundant tree species in Spain. Demographic data were derived from the Spanish Forest Inventory, a repeated-measures scheme including c. 90 000 permanent plots spread over a territory of c. 500 000 km[TD-SUP-OPEN]2. Functional traits data came primarily from a more detailed forest inventory carried out in Catalonia, NE Spain. Our study region covers a wide range of climatic conditions and, not surprisingly, the studied species differed markedly in their climatic niche. Despite that fact, our results showed that the variability in demographic rates across species was much more related to differences in functional traits than to differences in the average climate among species. Maximum tree height and, particularly, WD, emerged as key functional traits, and were the best predictors of demographic rates in our study. These two variables also mediated the marginally significant relationship between RGR and MR, suggestive of a weak trade-off between growth and survival. The main aspects of our results were not altered by the explicit incorporation of phylogenetic effects, suggesting that the observed relationships are not due to divergences between a few major clades. Synthesis. Our study gives support to the notion that variation in functional traits across species allows them to perform largely independently of climatic conditions along environmental gradients. © 2010 The Authors. Journal compilation © 2010 British Ecological Society.

Llegeix més

Atles de les plantes llenyoses dels boscos de Catalunya.

Lloret F, A Soler, Vayreda J, Estevan H, Terradas J (2009) Atles de les plantes llenyoses dels boscos de Catalunya. Ed. Lynx, Barcelona, 192 pp. La información de l’Atles s’actualitza al web http://oslo.geodata.es/ftp/llenyoses/.

Inventario de bosques singulares de Catalunya.

Gracia M, Comas L, Vayreda J, Ibàñez JJ, Batlles C, Regalado I (2009) Inventario de bosques singulares de Catalunya. V congreso forestal Español.

Patterns of species impoverishment in managed forests of Catalonia (NE Spain)

Lioret F., Solé A., Pino J., Vayreda J., Font X., Terradas J. (2009) Patterns of species impoverishment in managed forests of Catalonia (NE Spain). Journal of Vegetation Science. 20: 675-685.
Enllaç
Doi: 10.1111/j.1654-1103.2009.01059.x

Resum:

Question: In managed forests, woody plant richness shows great variations in pattern. Herein we try to elucidate the role of major factors, such as successional status, to explain this variation. Assuming that less competitive or disturbance-sensitive species will be systematically more prone to disappear, we investigate the existence of nonrandom patterns of species impoverishment - i.e., the number of species unable to attain maximal richness and the ecological and successional status of species associated with impoverishment in relation to a regional climatic gradient. Methods: We explored species composition in approximately 7500 forest plots in Catalonia (NE Spain). We evaluated non-random patterns of species impoverishment by analyzing their nestedness. Multivariate analysis was used to relate environmental variables and impoverishment to species occurrence. Plot successional status and ecological range were also estimated from species composition, and species impoverishment was then correlated to these estimators. Results: Most forests show a non-random pattern of species loss: poor stands tend to retain the same species, and the species determining high richness tend to be the same. Late successional species tend to be more common in impoverished plots of drier and warmer forests, while species typical of open or disturbed habitats are more common in impoverished plots of moister and colder forests. Communities dominated by early or late successional species are mostly impoverished, while the richest stands are constituted by species of intermediate stages. Forests dominated by species with a narrow or wide ecological range showed high impoverishment levels, while the richest stands had species with an intermediate ecological range. Discussion: In warmer Mediterranean forests, impoverishment tends to be associated with late successional stages, while in moister and colder forests, species loss is more closely related to disturbance and exploitation. This study reveals the difficulties involved in using species richness as a simple descriptor of the degree of forest conservation. Identification of dominant species and species indicative of ecological processes would constitute an easily applicable practice that would consolidate assessment of forests status. © 2009 International Association for Vegetation Science.

Llegeix més

Impactos del cambio climático sobre los bosques mediterráneos analizados en el marco de distintos proyectos de investigación. V Congreso Forestal Español. Montes y Sociedad: Saber que hacer.

Sabaté S, Espelta JM,Gracia C, Claramunt B, Cotillas de la Torre M, Keenan T, Sánchez Humanes B, Vayreda J, Plà E (2009) Impactos del cambio climático sobre los bosques mediterráneos analizados en el marco de distintos proyectos de investigación. V Congreso Forestal Español. Montes y Sociedad: Saber que hacer. S.E.C.F-Junta de Castilla y León. ISBN: 978-84-936854-6-1.

Determinants of woody species richness in Scot pine and beech forests: climate, forest patch size and forest structure

Estevan H., Lloret F., Vayreda J., Terradas J. (2007) Determinants of woody species richness in Scot pine and beech forests: climate, forest patch size and forest structure. Acta Oecologica. 31: 325-331.
Enllaç
Doi: 10.1016/j.actao.2007.01.003

Resum:

We analysed patterns of woody species richness in Pinus sylvestris and Fagus sylvatica forests in Catalonia (NE Spain) from forestry inventory databank in relation to climate and landscape structure. Both types of forests are found within the same climatic range, although they have been managed following somewhat different goals. Overall, woody species richness significantly increased when conditions get closer to the Mediterranean ones, with milder temperatures. Differences between the two types of forests arose when comparing the relationship between richness and forest patch size. Woody species richness increased in pine forests with patch size, while the opposite trend was observed in beech forests. This pattern is explained by the different behaviour of structural canopy properties, since leaf area index and canopy cover showed a steeper increase with increasing forest patch size in Fagus forests than in Pinus ones. Accordingly, richness decreased with canopy cover in Fagus plots, but not in Pinus ones. We suggest that these differences would be related to management history, which may have enhanced the preservation of beech stands in larger forest landscape units. © 2007 Elsevier Masson SAS. All rights reserved.

Llegeix més

Pàgines