Análisis fenológico en pastizales de dehesa

• Calabuig, E. Luis ^[1] ; Ignacio de Navascues y Gasca ; Gómez, J. M. ^[1]
  1. [1] Universidad de León

     Universidad de León

     León, España

     
• Localización: Pastos: Revista de la Sociedad Española para el Estudio de los Pastos, ISSN 0210-1270, Vol. 10, Nº. 2, 1980, págs. 17-30
• Idioma: español
• Títulos paralelos:
  • Phenological analysis in «dehesa» pastures
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• Resumen
  • español

    Se estudia la dinámica de los pastizales desde el punto de vista de las manifestaciones fenológicas en la zona de dehesas de la provincia de Salamanca, y a lo largo de los períodos prevernal, vernal, y estival. Dichos períodos pueden considerarse los más significativos y los que poseen mayor número de matices diferenciales entre los distintos tipos de pastizal. Se controlaron 21 parcelas pertenecientes a las comunidades más representativas de la zona.La información obtenida se ha simplificado, con objeto de ofrecer una visión más general de los aspectos fenológicos de cada tipo de pastizal, resumiendo las observaciones realizadas por especie para el conjunto de los pastizales de semejante categoría fenológica. Para este trabajo se han seleccionado las especies dominantes y las características. Los resultados de este estudio —fundamentalmente descriptivo— se representan gráficamente distinguiendo los tipos fundamentales de pastizal en función del gradiente oligotrofia eutrofia.

  • English

    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.