<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Coll, Lluís</style></author><author><style face="normal" font="default" size="100%">González-Olabarria, José Ramón</style></author><author><style face="normal" font="default" size="100%">Mola-Yudego, Blas</style></author><author><style face="normal" font="default" size="100%">Pukkala, Timo</style></author><author><style face="normal" font="default" size="100%">Messier, Christian</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Predicting understory maximum shrubs cover using altitude and overstory basal area in different Mediterranean forests</style></title><secondary-title><style face="normal" font="default" size="100%">European Journal of Forest Research</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">á altitude á</style></keyword><keyword><style  face="normal" font="default" size="100%">á fagaceae</style></keyword><keyword><style  face="normal" font="default" size="100%">Altitude</style></keyword><keyword><style  face="normal" font="default" size="100%">Basal area</style></keyword><keyword><style  face="normal" font="default" size="100%">e47</style></keyword><keyword><style  face="normal" font="default" size="100%">european network for forest</style></keyword><keyword><style  face="normal" font="default" size="100%">Fagaceae</style></keyword><keyword><style  face="normal" font="default" size="100%">Overstory</style></keyword><keyword><style  face="normal" font="default" size="100%">overstory á basal area</style></keyword><keyword><style  face="normal" font="default" size="100%">Pinaceae</style></keyword><keyword><style  face="normal" font="default" size="100%">Shrub cover</style></keyword><keyword><style  face="normal" font="default" size="100%">shrub cover á pinaceae</style></keyword><keyword><style  face="normal" font="default" size="100%">the cost action</style></keyword><keyword><style  face="normal" font="default" size="100%">the final conference of</style></keyword><keyword><style  face="normal" font="default" size="100%">this article originates from</style></keyword><keyword><style  face="normal" font="default" size="100%">vegetation management</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2010</style></year><pub-dates><date><style  face="normal" font="default" size="100%">2010///</style></date></pub-dates></dates><urls><web-urls><url><style face="normal" font="default" size="100%">http://www.springerlink.com/index/10.1007/s10342-010-0395-yhttp://link.springer.com/10.1007/s10342-010-0395-y</style></url></web-urls></urls><volume><style face="normal" font="default" size="100%">130</style></volume><pages><style face="normal" font="default" size="100%">55 - 65</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">In some areas of the Mediterranean basin where the understory stratum represents a critical ﬁre hazard, managing the canopy cover to control the understory shrubby vegetation is an ecological alternative to the current mechanical management techniques. In this study, we determine the relationship between the overstory basal area and the cover of the understory shrubby vegetation for different dominant canopy species (Pinaceae and Fagaceae species) along a wide altitudinal gradient in the province of Catalonia (Spain). Analyses were conducted using data from the Spanish National Forest Inventory. At the regional scale, when all stands are analysed together, a strong negative relationship between mean shrub cover and site elevation was found. Among the Pinaceae species, we found fairly good relationships between stand basal area and the maximum development of the shrub stratum for species located at intermediate elevations (Pinus nigra, Pinus sylvestris). However, at the extremes of the elevationclimatic gradient (Pinus halepensis and Pinus uncinata stands), stand basal area explained very little of the shrub cover variation probably because microsite and topographic factors override its effect. Among the Fagaceae species, a negative relationship between basal area and the maximum development of the shrub stratum was found in Quercus humilis and Fagus sylvatica dominated stands but not in Quercus ilex. This can be due to the particular canopy structure and management history of Q. ilex stands. In conclusion, our study revealed a marked effect of the tree layer composition and the environment on the relationship between the development of the understory and overstory tree structure. More ﬁne-grained studies are needed to provide forest managers with more detailed information about the relationship between these two forest strata.</style></abstract><issue><style face="normal" font="default" size="100%">1</style></issue></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Ramírez, José Alberto</style></author><author><style face="normal" font="default" size="100%">Díaz, Mario</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">The role of temporal shrub encroachment for the maintenance of Spanish holm oak Quercus ilex dehesas</style></title><secondary-title><style face="normal" font="default" size="100%">Forest Ecology and Management</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">Dehesa</style></keyword><keyword><style  face="normal" font="default" size="100%">Quercus ilex</style></keyword><keyword><style  face="normal" font="default" size="100%">Regeneration</style></keyword><keyword><style  face="normal" font="default" size="100%">rotational set-aside</style></keyword><keyword><style  face="normal" font="default" size="100%">Shrub cover</style></keyword><keyword><style  face="normal" font="default" size="100%">Sustainability</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2008</style></year><pub-dates><date><style  face="normal" font="default" size="100%">2008///</style></date></pub-dates></dates><urls><web-urls><url><style face="normal" font="default" size="100%">http://linkinghub.elsevier.com/retrieve/pii/S0378112707009590</style></url></web-urls></urls><volume><style face="normal" font="default" size="100%">255</style></volume><pages><style face="normal" font="default" size="100%">1976 - 1983</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">Dehesas are man-made systems composed by evergreen oaks (Quercus ilex and Quercus suber) scattered over a grassland understorey. They cover about 3.1 million ha in the southwest of the Iberian Peninsula and are to be preserved under the EU Habitats Directive due to the high levels of plant and animal diversity they maintain. The main current threat to long-term dehesa farming is a chronic absence of natural tree regeneration.We test whether dehesa abandonment would promote natural regeneration, how size structure of tree populations change after abandonment, and whether shrub encroachment would enhance seedling recruitment by measuring the size structure of mature tree populations, shrub cover and seedling density in 17 dehesa farms of known date of abandonment. Size structures were approximately bell-shaped in farms abandoned less than 16 years ago, progressively approaching afterwards the inverse J-shaped distribution typical from holm oak forests. Proportions of young mature trees changed with age of abandonment according to a logistic growth function. Proportions typical from forests (70–80%) were reached 30 years after abandonment, whereas balanced numbers of young and old trees were reached 20–25 years after abandonment. Short-term seedling recruitment was not related to age of abandonment or to covers of most dominant shrubs and was positively related to cover of mature trees and of Cytisus multiflorus, a nurse shrub for holm oak seedlings. Synthesis and applications: Conservation of dehesas and their associated biodiversity values should be based on financing temporal abandonment of productive dehesa farming for 20 years, keeping land in good agricultural condition by re-opening the encroached plots after tree recruitment (i.e. rotational set-aside). The proposed measure has the additional advantages of easy monitoring and straightforward evaluation of its effectiveness.</style></abstract><issue><style face="normal" font="default" size="100%">5-6</style></issue></record></records></xml>