Landscapes Forest and Global Change - ESA - Escola Superior ...

E. Fernández-Núñez et al. 2010. Eight years of development of a silvopastoral system: effects on floristic diversity
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was reduced when fertiliser was applicated (D or M). These treatments have favoured
the presence of Dactylis glomerata (80, 60, 39% under D, M and NF, respectively).
This gramineae is characterised by strong growth in height that limit the presence of
other species (Rodríguez et al. 2001). At low density, SR was reduced by D treatment
around 50% when compared with M y NF treatments in pine stands. Dactylis glomerata
and Rumex obtusifolius L. were the most abundant species in D. Some Polygonaceae
plants including Rumex spp. have been described as allelopathic and reduced the
germination of Lolium spp (Lutts et al. 1987) and inhibited some grasses and controlled
their spatial distribution (Carballeria et al. 1988). Regarding birch established at low
density, D and M treatments had lower biodiversity than NF in spite of being birch
smaller in those treatments compared with NF. Both D and M had an important
proportion of Dactylis glomerata, Agrostis capillaris L. and Holcus lanatus L. Tree
canopy develop also caused a reduction on evenness and therefore an increase of the dominance
of perennial species (Dactylis glomerata, Holcus lanatus and Agrostis capillaris), irrespective
of the overstorey tree species and density.
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