<?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%">Gallego Fernández, Juan B.</style></author><author><style face="normal" font="default" size="100%">Rosario García Mora, M.</style></author><author><style face="normal" font="default" size="100%">García Novo, Francisco</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Vegetation dynamics of Mediterranean shrublands in former cultural landscape at Grazalema Mountains, South Spain</style></title><secondary-title><style face="normal" font="default" size="100%">Plant Ecology (formerly Vegetatio)</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">Human disturbance</style></keyword><keyword><style  face="normal" font="default" size="100%">Land abandonment</style></keyword><keyword><style  face="normal" font="default" size="100%">Mediterranean vegetation</style></keyword><keyword><style  face="normal" font="default" size="100%">Regen- erative succession</style></keyword><keyword><style  face="normal" font="default" size="100%">Regenerative strategies</style></keyword><keyword><style  face="normal" font="default" size="100%">Secondary succession</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2004</style></year><pub-dates><date><style  face="normal" font="default" size="100%">2004///</style></date></pub-dates></dates><urls><web-urls><url><style face="normal" font="default" size="100%">http://www.springerlink.com/openurl.asp?id=doi:10.1023/B:VEGE.0000026039.00969.7a</style></url></web-urls></urls><volume><style face="normal" font="default" size="100%">172</style></volume><pages><style face="normal" font="default" size="100%">83 - 94</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">Plant community dynamics in Mediterranean basin ecosystems are mainly driven by an alternation of episodes of human intervention and land abandonment. As a result, a mosaic of plant communities has evolved following different stages of degradation and regeneration. Some authors has relate secondary succession to abandoned culture lands and regeneration to natural systems with abandonment of livestock or forestry exploitation. In this paper, the dynamics of shrublands in mid-mountain areas in the South of Spain after disturbance and land abandonment has been studied. The plant cover and 13 environmental variables of 137 selected sites on the Grazalema mountains was analysed to determine the vegetation pattern in relation to environmental factors and the succession types, either regenerative or secondary succession. The results show that today the Grazalema mountains have a heterogeneous vegetation pattern. Besides physical factors such as altitude or soil pH, human disturbance has modulated current vegetation patterns and dynamics. Two main types of vegetation dynamics can be distinguished in the study area. In areas affected by cutting, regeneration results in rich and dense shrub land, with resprouters as dominant species. In areas affected by recurrent wildﬁres or agriculture, secondary succession became dominant, resulting in less diverse shrubland, due to the dominance of seeders and decrease in resprouter species richness and cover.</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%">MARAÑÓN, T</style></author><author><style face="normal" font="default" size="100%">Figueroa, E</style></author><author><style face="normal" font="default" size="100%">Cota, H</style></author><author><style face="normal" font="default" size="100%">Doncel, J L</style></author><author><style face="normal" font="default" size="100%">García Novo, Francisco</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Estudio ecológico de los pastizales de dehesa en la provincia de Badajoz. Tipificación preliminar de la vegetación empleando el análisis de correspondencias</style></title><secondary-title><style face="normal" font="default" size="100%">Pastos</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">Dehesa</style></keyword><keyword><style  face="normal" font="default" size="100%">pastizales</style></keyword><keyword><style  face="normal" font="default" size="100%">suelo</style></keyword><keyword><style  face="normal" font="default" size="100%">vegetación (voyant)</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">1977</style></year></dates><volume><style face="normal" font="default" size="100%">7</style></volume><pages><style face="normal" font="default" size="100%">29-37</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">42 grasslands of Badajoz and Huelva provinces (Western Spain) were studied recording plant species frequencies with 10 quadrats (20 X 20 cm.) randomly distributed over 2 X 2 m. plots taken under the crown of Quercus rotundifolia trees. Soil samples collected on every plot were analysed for pH, orgainic matter, P, Ca, K and Na. Frequency matrix (80 plant species X 42 plots) was analysed by the method know as &quot;Analyse des Correspondences&quot; (BENZECRI, 1973). The two main components (accounting for about 20 % of the overall variation) sepárate plots into six recognizable groups (grassland types). A preliminary attempc to interpret those groups is made in terms of biotope (soil and substrate) differencies. The two main directions of variation found correspond to an eutrophization gradient (poor acidic versus rich basic soils) and to an erosión gradient (soil erosión versus pedogenesis). Secondary causes of variation are interpreted as due to lithology, climate and management. Further analysis of present data is currently under way.</style></abstract></record></records></xml>