<?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%">Gomez Gutiérrez, J M</style></author><author><style face="normal" font="default" size="100%">BARRERA MELLADO, I</style></author><author><style face="normal" font="default" size="100%">FERNÁNDEZ SANTOS, B</style></author><author><style face="normal" font="default" size="100%">Guti, M E Z</style></author><author><style face="normal" font="default" size="100%">Mellado, Barrera</style></author><author><style face="normal" font="default" size="100%">Santos, Ndez</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Fitomasa subterránea en pastizales semiáridos de dehesa. Estudio comparativo de cuatro transecciones</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%">fitomasa subterránea</style></keyword><keyword><style  face="normal" font="default" size="100%">Grasslands</style></keyword><keyword><style  face="normal" font="default" size="100%">pastizales</style></keyword><keyword><style  face="normal" font="default" size="100%">raíces</style></keyword><keyword><style  face="normal" font="default" size="100%">roots</style></keyword><keyword><style  face="normal" font="default" size="100%">vaguada</style></keyword><keyword><style  face="normal" font="default" size="100%">water course</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">1988</style></year></dates><volume><style face="normal" font="default" size="100%">19</style></volume><pages><style face="normal" font="default" size="100%">95-107</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">A comparative study of the underground phytomass (roots) valúes obtained along four transverse sections of four water courses was made in some semiarid grasslands, that are representative of the Central- Western área of Spain (Provinces of Avila and Salamanca). In order to perform this study, the following item's were studied: a) the total phyto- mass valúes for each profile (30 cm depth, 9 cm diameter), b) the hori- zons or 5 cm horizontal transect, in each section, c) the samples in each profile. Very similar sequences were observed in all the transects, high- lighting the effect of relief on underground phytomass, wich is considered a synthesis and an expression of the edaphicclimatic and anthropozoogenic action that governs its development. Key</style></abstract></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%">GARCÍA CIUDAD, A.</style></author><author><style face="normal" font="default" size="100%">MORENO DOMÍNGUEZ, 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%">Variación estacional de la composición mineral en pastizales de dehesa</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%">composición mineral</style></keyword><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%">variación estacional (voyant)</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">1981</style></year><pub-dates><date><style  face="normal" font="default" size="100%">1981///</style></date></pub-dates></dates><urls><web-urls><url><style face="normal" font="default" size="100%">http://polired.upm.es/index.php/pastos/article/view/1575</style></url></web-urls></urls><volume><style face="normal" font="default" size="100%">11</style></volume><pages><style face="normal" font="default" size="100%">217 - 233</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">The seasonal variations in the concentrations of sahes, N, P, K, Ca, Mg, Na, Fe, Mn, Cu and Zn in the pasture lands of a dehesas in the Pro- vince of Salamanca are studied. The sampling was monthly and took place during the period from September 1978 to October 1979. In general, the contení of ashes, N, P and K evolves in a similar ma- nner, reaching highest valúes in spring and lowest valúes in summer. Ho- wever, the concentrations of Ca, Mg and Mn show sharp oscilations at zone or fasture-type level. Those of Na, Cu and Zn are totally different from eteach other, but while in the Na concentration there are scarce fluc- tuations throughout the seasons, there are marked variations in the other tvvo. The elements Mg and Na are outstanding due to their relatively low concentrations which lie between 0 03 and 0.15% and 0.02 and 0.14% for the former and the latter, respectively. In the pasture land of the dehesa studied, it is usual to find deficien- cies in the elements Na, Cu and Zn throughout the year, while it is only in spring that the concentrations of N, P, Ca and Mg rise above the cri- tical levéis of an adequate nutrition for rumiants.</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%">Calabuig, E L</style></author><author><style face="normal" font="default" size="100%">Navascués, I</style></author><author><style face="normal" font="default" size="100%">GÓMEZ, J M</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Análisis fenológico en pastizales de dehesa</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%">especies caracteristicas (voyant)</style></keyword><keyword><style  face="normal" font="default" size="100%">fenología</style></keyword><keyword><style  face="normal" font="default" size="100%">gradiente de oligotrofia</style></keyword><keyword><style  face="normal" font="default" size="100%">pastizales</style></keyword><keyword><style  face="normal" font="default" size="100%">Trifolium</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">1980</style></year></dates><volume><style face="normal" font="default" size="100%">10</style></volume><pages><style face="normal" font="default" size="100%">17-30</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">One oí the features of the dynamics of the grazing-lands is represented by its evolution during primary growth, when all phenological sings of the plants are seen. In the «dehesa» área in Salamanca, the prevernal, vernal and aestival periods are the most significant, and show the highest quantity of differentiatingpoints between one typegrazing-land and another. It was during these periods that regular observadons were made in 21 allotments, which belong to the most representative communities in the área, showing for each of the species its phenological state at any given moment. The information gathered has been simplified so as to offer a more general view of the phenological aspects of each type of grazing-land, summarizing the observations made per species for the group of pastures of similar taxonomic category. Likewise, the species which showed phisionomical character were selected, i.e.: those which contribute in highest proportion to the biomass of the community; in a word, those species which are dominant due to their hi^her absolute frecuency or their greater covering. To-complement this, the characteristic species are also considered. This study, descriptive in its essence, enables us on the one hand, to correlate the specific phenological observations with the general characteristics of the grazing-land to which they belong, and, in the other, to analyse the evolution of the same species in different pastures. The results obtained are given graphically, showing the differences between the definable types of pasture using the oligotrophy-eutrophy gradient</style></abstract></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%">González Bernáldez, F</style></author><author><style face="normal" font="default" size="100%">Díaz Pineda, F</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Bases para la tipificación integrada de los pastizales de dehesa</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%">geosistema (voyant)</style></keyword><keyword><style  face="normal" font="default" size="100%">ladera</style></keyword><keyword><style  face="normal" font="default" size="100%">pastizales</style></keyword><keyword><style  face="normal" font="default" size="100%">Sistema Central</style></keyword><keyword><style  face="normal" font="default" size="100%">tipificación integrada</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">1980</style></year></dates><volume><style face="normal" font="default" size="100%">10</style></volume><pages><style face="normal" font="default" size="100%">20-43</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">Rational use of seminatural rangeland requires integrated surveys and tipification. These rely upon a synthesis of characteristics of the geosystems underlying such natural complexes. Although there are different possible procedures, it is important that integrated typolo- gies reflect the most important geosystemic features, according to funcional, structural and genetic criteria. Homologies should clearly appear even when floristically unrelated áreas are considered (Mediterranean, California, Australia, etc.). Integration criteria specified by four dimensions or aspects are described. These have been rried by the authors in rangeland áreas of Center and the Southwest of the Iberian Península and are: Equipotenciality (zonality): related to position in gradients, altitudinal zones, northern and southern slopes, radiation patterns. Vectoriality: related to position in the dynamical system of interfluve and channel and slope dynamics. Mosaicity (azonality, cellularity): appartenence to roughly isodiametric patterns superposed to the forms and uncorrelated with them. Successional dinamicity: related to succesional changes normally conditioned by range management. Most of the differentiated features tend to recur within the landscape thus facüitating survey and mapping</style></abstract></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>