Wspólnotowy Serwis Informacyjny Badan i Rozwoju - CORDIS

Gene flow parameters of Fagus sylvatica

Mating system parameters have been estimated in different Fagus sylvatica stands. Paternity and parentage analysis were performed. These parameters are implemented in simulation models. Gene flow studies revealed that a high proportion of pollen is coming from outside the analysed stands. Pollen dispersal curves indicate different dispersal distances in the beech stands. Seed dispersal curves showed that a high frequency of seeds is dispersed to a distance up to 80-100 meters, with peaks at 30-40 meters. Few direct measurements of seed dispersal within populations have been performed so far. Therefore these results can be considered very innovative. Both pollen and seed dispersal curves represent important parameters to be implemented into simulation models. Analysis about the presence of spatial structure within stand was performed in 10 Fagus sylvatica populations characterized by different management intensity. Some positive spatial autocorrelation was observed in all unmanaged stands while no structure was observed in almost all managed stands. The presence of positive autocorrelation is an important aspect to be taken into consideration in the stand management. In particular, the collection of seeds to be used to produce seedlings for reforestation should be performed from trees at least 30-40 meters apart: this would avoid using seed lots having a too high proportion of inbreeds. Silvicultural treatments seem to play a role in reducing (or even cancelling) the spatial structure within stands. This information can be extremely useful for planning efficiently the managemnt of beech stands and for establish criteria for seed collection.

Reported by

National Research Counsel
Via Madonna del Piano, Edificio D
50019 Firenze
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