<?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></contributors><titles><title><style face="normal" font="default" size="100%">Drought reduced monoterpene emissions from the evergreen Mediterranean oak Quercus ilex: results from a throughfall displacement experiment</style></title><secondary-title><style face="normal" font="default" size="100%">Biogeosciences</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">2009</style></year></dates><volume><style face="normal" font="default" size="100%">6</style></volume><pages><style face="normal" font="default" size="100%">1167-1180</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">The effects of water limitations on the emission of biogenic volatile organic compounds are not well understood. Experimental approaches studying drought effects in natural conditions are still missing. To address this question, a throughfall displacement experiment was set up in a natural forest of Quercus ilex, an evergreen Mediterranean oak emitting monoterpenes. Mature trees were exposed in 2005 and 2006 either to an additional drought, to irrigation or to natural drought (untreated control). In both years, absolute monoterpene emission rates as well as the respective standard factors of the trees exposed to normal and additional drought strongly declined during the drought periods. Monoterpene emissions were lower in year 2006 than in year 2005 (factor 2) due to a more pronounced summer drought period in this respective year. We observed a signiﬁcant difference between the irrigation and additional drought or control treatment: irrigated trees emitted 82% more monoterpenes during the drought period 2006 than the trees of the other treatments. However, no signiﬁcant effect on monoterpene emission was observed between normal and additional drought treatments, despite a signiﬁcant effect on leaf water potential and photochemical efﬁciency. During the development of drought, monoterpene emissions responded exponentially rather than linearly to decreasing leaf water potential. Emissions rapidly declined when the water potential dropped below −2 MPa and photosynthesis was persistently inhibited. Monoterpene synthase activities measured in vitro showed no clear reduction during the same period. From our results we conclude that drought signiﬁcantly reduces monoterpene ﬂuxes of Mediterranean Holm oak forest into the atmosphere due to a lack of primary substrates coming from photosynthetic processes</style></abstract></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors></contributors><titles><title><style face="normal" font="default" size="100%">Effects on natural regeneration of woodland in a dehesa system grazed by Avilena-Negra Iberica Breed</style></title><secondary-title><style face="normal" font="default" size="100%">Cahiers Options …</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">1999</style></year></dates><pages><style face="normal" font="default" size="100%">257-259</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">Effects on concentrated calving against continuous calving and different supplementation levels on cattle in a dehesa system have been studied. In these experimental conditions we considered it necessary to evaluate grazing effectso n natural regeneration of holm oaks (Quercus rotundifoliaa) nd cork oaks (Quercus suber).</style></abstract></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors></contributors><titles><title><style face="normal" font="default" size="100%">PARÁMETROS PRODUCTIVOS Y REPRODUCTIVOS EN UN REBAÑO DE OVINO TALAVERANO DURANTE LA TRANSFORMACIÓN EN PASTOS DE UN CULTIVO</style></title><secondary-title><style face="normal" font="default" size="100%">Pastos</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">1999</style></year></dates><volume><style face="normal" font="default" size="100%">29</style></volume><pages><style face="normal" font="default" size="100%">105-127</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">The aim of the present paper is to evalúate the effects of phosphate fertilization on animal performance in a trial of pasture regeneration on an abandoned oat culture in a dehesa system at NW of Toledo province (Spain), during four consecutive years. Fertility, prolificacy and other productive features (meat production, flock live weight evolution , stocking rate, etc.) were compared between an abandoned culture with or without fertilisation and a semi-natural pasture. Reproductive Índices were similar between treatments across experimental period. Live weight variations and body condition were affected by years through the different pasture production; the results of fertilized pastures were better than natural pasture, especially in wet springs. Although the stocking rate was higher in fertilised pasture than in natural pasture, meat production (kg lamb/ha) was similar for both treatments. If higher stocking rates had been established meat production (kg/ha) could have been increased according to the results of pasture production, live weight and body condition. The low number of weaned lambs per ewe at tupping and the difficulties to adjust the stocking rates, limited the positive effects of fertilization. Key</style></abstract></record></records></xml>