<?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%">Llusia, Joan</style></author><author><style face="normal" font="default" size="100%">Bermejo-Bermejo, Victoria</style></author><author><style face="normal" font="default" size="100%">Calvete-Sogo, Héctor</style></author><author><style face="normal" font="default" size="100%">Penuelas, Josep</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Decreased rates of terpene emissions in Ornithopus compressus L. and Trifolium striatum L. by ozone exposure and nitrogen fertilization.</style></title><secondary-title><style face="normal" font="default" size="100%">Environmental pollution (Barking, Essex : 1987)</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">Annual pastures</style></keyword><keyword><style  face="normal" font="default" size="100%">BVOCS</style></keyword><keyword><style  face="normal" font="default" size="100%">Emissions</style></keyword><keyword><style  face="normal" font="default" size="100%">Gas exchange</style></keyword><keyword><style  face="normal" font="default" size="100%">legumes</style></keyword><keyword><style  face="normal" font="default" size="100%">Nitrogen deposition</style></keyword><keyword><style  face="normal" font="default" size="100%">Ozone</style></keyword><keyword><style  face="normal" font="default" size="100%">terpenes</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2014</style></year></dates><volume><style face="normal" font="default" size="100%">194C</style></volume><pages><style face="normal" font="default" size="100%">69-77</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">Increasing tropospheric ozone (O3) and nitrogen soil availability (N) are two of the main drivers of global change. They both may affect gas exchange, including plant emission of volatiles such as terpenes. We conducted an experiment using open-top chambers to analyze these possible effects on two leguminous species of Mediterranean pastures that are known to have different O3 sensitivity, Ornithopus compressus and Trifolium striatum. O3 exposure and N fertilization did not affect the photosynthetic rates of O. compressus and T. striatum, although O3 tended to induce an increase in the stomatal conductance of both species, especially T. striatum, the most sensitive species. O3 and N soil availability reduced the emission of terpenes in O. compressus and T. striatum. If these responses are confirmed as a general pattern, O3 could affect the competitiveness of these species.</style></abstract><accession-num><style face="normal" font="default" size="100%">25094059</style></accession-num></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%">Gómez-Rey, Maria Xesús</style></author><author><style face="normal" font="default" size="100%">Garcês, Ana</style></author><author><style face="normal" font="default" size="100%">Madeira, Manuel</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Organic C distribution and N mineralization in soil of oak woodlands with improved pastures</style></title><secondary-title><style face="normal" font="default" size="100%">Revista de Ciências Agrárias</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">agroforestry systems</style></keyword><keyword><style  face="normal" font="default" size="100%">legumes</style></keyword><keyword><style  face="normal" font="default" size="100%">Mediterranean climate</style></keyword><keyword><style  face="normal" font="default" size="100%">soil quality.</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2011</style></year><pub-dates><date><style  face="normal" font="default" size="100%">2011///</style></date></pub-dates></dates><volume><style face="normal" font="default" size="100%">34</style></volume><pages><style face="normal" font="default" size="100%">80 - 92</style></pages><isbn><style face="normal" font="default" size="100%">0871-018X UL - http://www.scielo.gpeari.mctes.pt/scielo.php?script=sci_arttext&amp;pid=S0871-018X2011000100008&amp;nrm=iso</style></isbn><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">Cork oak woodlands in Portugal are a multipurpose agroforestry system occurring in areas mostly degraded by former cereal crops and overgrazing. The objective of this study was to evaluate the effect of scattered cork oak trees (Quercus suber L.) on soil quality, considering two land use systems: unmanaged pastures and improved pastures. Soil samples were collected in a square grid around scattered cork oak trees to evaluate the spatial variability of soil bulk density and chemical properties. In soil samples taken beneath tree canopy and in the open, net N mineralization was evaluated by aerobic incubations. Also, laboratory incubations were carried out to evaluate the effect of roots (tree or/and herbaceous) and water solutions (bulk precipitation, throughfall or stemflow) on net N mineralization.Contents of organic C, total N and extractable P were increased beneath the tree canopy, and gradually decreased with the increase of distance to the tree trunk. Improved pastures established 26 years ago increased organic C (0.76 kg m-2), total N (0.06 kg m-2) and extractable P (2.70 g m-2) amounts in the 0-10 cm soil layer beneath the tree canopy relatively to those of unmanaged pastures. Net N mineralization was significantly greater (about 2 times) in soils beneath the tree canopy than in those of open areas. N mineralization was unaffected by addition of throughfall or stemflow, while a significant reduction resulted from tree roots addition, this effect being stronger for herbaceous plant roots than for tree roots. Maintenance of tree cover combined with permanent improved pastures should be considered to improve soil quality in oak woodlands of Southern Portugal.</style></abstract><notes><style face="normal" font="default" size="100%">The following values have no corresponding Zotero field:&lt;br/&gt;publisher: scielopt</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%">Ruano-Ramos, A</style></author><author><style face="normal" font="default" size="100%">García-Criado, B</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Near infrared spectroscopy prediction of mineral content in botanical fractions from semi-arid grasslands</style></title><secondary-title><style face="normal" font="default" size="100%">Animal feed science and technology</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">forbs</style></keyword><keyword><style  face="normal" font="default" size="100%">Grasses</style></keyword><keyword><style  face="normal" font="default" size="100%">grassland samples</style></keyword><keyword><style  face="normal" font="default" size="100%">legumes</style></keyword><keyword><style  face="normal" font="default" size="100%">Mineral content</style></keyword><keyword><style  face="normal" font="default" size="100%">near infrared spectroscopy</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">1999</style></year></dates><volume><style face="normal" font="default" size="100%">77</style></volume><pages><style face="normal" font="default" size="100%">331-343</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">Near infrared reflectance spectroscopy (NIRS) was assessed for its capacity to estimate the mineral content of semi-arid grassland samples. NIRS calibrations were derived for P, K, Ca and Mg contents. Four populations of samples were used: total herbage, with a heterogeneous and complex botanical composition, and its botanical components (grasses, legumes and forbs). One set of samples from each population was selected to develop the specific calibration equations using three mathematical data treatments (log 1/R, first derivative, and second derivative). Reference values from the calibration sample set were regressed on the corresponding spectral data using stepwise multiple regression analysis. The equations were validated with samples from the same four populations that had not been included in the calibration. The NIRS method afforded acceptable accuracy in the prediction of P, K, Ca and Mg contents in the total herbage population and its botanical fractions. Botanical composition and mathematical treatment affected both the accuracy and precision of NIRS analyses; in this sense, the best fits were usually obtained using samples of simpler botanical composition (legumes and grasses), while the first derivative usually led to better results in the estimation of most parameters. # 1999 Elsevier Science B.V. All rights reserved.</style></abstract></record></records></xml>