<?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%">Carranca, C.</style></author><author><style face="normal" font="default" size="100%">Castro, I. V.</style></author><author><style face="normal" font="default" size="100%">Figueiredo, N.</style></author><author><style face="normal" font="default" size="100%">Redondo, R.</style></author><author><style face="normal" font="default" size="100%">Rodrigues, a R. F.</style></author><author><style face="normal" font="default" size="100%">Saraiva, I.</style></author><author><style face="normal" font="default" size="100%">Maricato, R.</style></author><author><style face="normal" font="default" size="100%">Madeira, M. a V.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Influence of tree canopy on N2 fixation by pasture legumes and soil rhizobial abundance in Mediterranean oak woodlands.</style></title><secondary-title><style face="normal" font="default" size="100%">The Science of the total environment</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">Above and belowground organ</style></keyword><keyword><style  face="normal" font="default" size="100%">Agro forestry system</style></keyword><keyword><style  face="normal" font="default" size="100%">Cutting frequency</style></keyword><keyword><style  face="normal" font="default" size="100%">light</style></keyword><keyword><style  face="normal" font="default" size="100%">Quercus Suber L</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2015</style></year><pub-dates><date><style  face="normal" font="default" size="100%">2015///</style></date></pub-dates></dates><urls><web-urls><url><style face="normal" font="default" size="100%">http://www.ncbi.nlm.nih.gov/pubmed/25460942</style></url></web-urls></urls><volume><style face="normal" font="default" size="100%">506-507</style></volume><pages><style face="normal" font="default" size="100%">86 - 94</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">Symbiotic N2 fixation is of primordial significance in sustainable agro-forestry management as it allows reducing the use of mineral N in the production of mixed stands and by protecting the soils from degradation. Thereby, on a 2-year basis, N2 fixation was evaluated in four oak woodlands under Mediterranean conditions using a split-plot design and three replicates. (15)N technique was used for determination of N2 fixation rate. Variations in environmental conditions (temperature, rainfall, radiation) by the cork tree canopy as well as the age of stands and pasture management can cause great differences in vegetation growth, legume N2 fixation, and soil rhizobial abundance. In the present study, non-legumes dominated the swards, in particular beneath the tree canopy, and legumes represented only 42% of total herbage. A 2-fold biomass reduction was observed in the oldest sown pasture in relation to the medium-age sward (6tDWha(-1)yr(-1)). Overall, competition of pasture growth for light was negligible, but soil rhizobial abundance and symbiotic N2 fixation capacity were highly favored by this environmental factor in the spring and outside the influence of tree canopy. Nitrogen derived from the atmosphere was moderate to high (54-72%) in unsown and sown swards. Inputs of fixed N2 increased from winter to spring due to more favorable climatic conditions (temperature and light intensity) for both rhizobia and vegetation growths. Assuming a constant fixation rate at each seasonal period, N2 fixation capacity increased from about 0.10kgNha(-1) per day in the autumn-winter period to 0.15kgNha(-1) per day in spring. Belowground plant material contributed to 11% of accumulated N in pasture legumes and was not affected by canopy. Size of soil fixing bacteria contributed little to explain pasture legumes N.</style></abstract><notes><style face="normal" font="default" size="100%">The following values have no corresponding Zotero field:&lt;br/&gt;publisher: Elsevier B.V.&lt;br/&gt;accession-num: 25460942</style></notes></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%">Rodríguez-Estévez, V.</style></author><author><style face="normal" font="default" size="100%">García, A.</style></author><author><style face="normal" font="default" size="100%">Perea, J.</style></author><author><style face="normal" font="default" size="100%">Mata, C.</style></author><author><style face="normal" font="default" size="100%">Gómez, A. G.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Producción de bellota en la dehesa: factores influyentes</style></title><secondary-title><style face="normal" font="default" size="100%">Arch. Zootec</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">Agro forestry system</style></keyword><keyword><style  face="normal" font="default" size="100%">evergreen oak</style></keyword><keyword><style  face="normal" font="default" size="100%">iberian pig</style></keyword><keyword><style  face="normal" font="default" size="100%">Mast-seeding</style></keyword><keyword><style  face="normal" font="default" size="100%">Montanera</style></keyword><keyword><style  face="normal" font="default" size="100%">Quercus</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2007</style></year><pub-dates><date><style  face="normal" font="default" size="100%">2007///</style></date></pub-dates></dates><urls><web-urls><url><style face="normal" font="default" size="100%">http://ibmblade10.uco.es/xmlui/handle/10396/2877</style></url></web-urls></urls><volume><style face="normal" font="default" size="100%">56</style></volume><pages><style face="normal" font="default" size="100%">25 - 43</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">This paper reviews the state-of-the- knowledge of acorn production in the South- Western Iberian dehesas. In the first part are briefly described the soil and climatic determining factors and phenology of most common trees of genus Quercus at the dehesa (Q. ilex, Q. suber and Q. faginea). In the second part, acorn production estimations are analyzed. Was established a mean acorn yield of 300 to 700 kg/ ha; with individual productions of 8-14 kg/tree for Q. ilex, 5-10 kg/tree for Q. suber and 1-11 kg/ tree for Q. faginea; with a highly variable production, both between and within years and individual trees. Finally we review the factors affecting acorn production, describing density of trees (estimated in 20-50 trees/ha), masting phenomenon (with cycles of 2-5,5 years and asynchrony between trees), individual cha- racteristics of trees (genetic potential, age, top surface, etc.), tree mass handling (with favourable effect of tilling, moderate pruning and sustainable grazing), meteorological conditions (mainly drought and meteorology during flowering) and sanitary status (Lymantria, Tortrix, Curculio, Cydia, Balaninus and Brenneria).</style></abstract></record></records></xml>