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The chestnut (Castanea sativa Miller) forests from Extremadura and Astur-Cantabrian regions have been studied and compared in ecological terms. Parameters which discriminate significantly chestnut forests from both areas have been researched too. The study has been carried out using different multivariate techniques (PCA, DA).

In a previous paper (Gandullo, 1974), a sunshine parameter, evaluating light intensity from hill slope and terrain aspect, was developed. This paper presents a new sunshine parameter development trying to assess sunny and shady aspects from the thermic point of view, considering that the maximum daily temperatures occur between two and three hours in the afternoon