FACTORIAL AMBITS WITH HIGH PHYTOCLIMATIC VIABILITY FOR CHESTNUT (CASTANEA SATIVA) IN SPAIN

J.M. García-López, C. Allué Camacho
Factorial ambits with high viability have been established for chestnut (Castanea sativa) formations in Spain. Preliminary phytoclimatic characterization was carried out on the basis of a survey of 898 sampling points from the Second National Forestry Inventory, where chestnut was the dominant species in forest formation. A modified version of the Allué-Andrade phytoclimatic system was used; this was applied to a factorial climatic model of regionalized climatic variables superimposed on a digital model of elevations of all peninsular Spain. This is a quantitative phytoclimatic system, meaning that it does not only allow inclusion of a station in a previously-defined phytoclimatic category in qualitative terms, but it also allows quantification of the extent to which the station fits into such a category or phytoclimatic type—and also into other types in the system—by using coordinates of position and phytoclimatic distances, as related to one another and with reference to factorial phytoclimatic ambits corresponding to the chief plant life strategies of forest covers. By requiring increasing values of the phytoclimatic suitability index, several factorial ambits of increasing phytoclimatic viability were derived for Spanish chestnuts. For the purposes of this research, phytoclimatic suitability means the extent (from 0 to 1) to which a site is suitable as a habitat for chestnut formations, always from the combined standpoints of durability (capacity for self-regeneration), ability to compete with other species and resistance to diseases. The paper stresses that the system of increasing degrees of phytoclimatic suitability is used to select, within the species’ own ecological ambit, chestnut stations presenting aridity (preferentially lasting between 1.5 and 3.5 months), higher limits of average annual and summer precipitation, lower and higher temperatures (practically zero duration of frosts and high average temperatures in the coldest month). A (duration of aridity) and T (average annual temperature) were the factors that correlated best with suitability of chestnut; a simple polynomial formula based on these two factors is presented for approximate evaluation of the index.
García-López, J.M. and Allué Camacho, C. (2008). FACTORIAL AMBITS WITH HIGH PHYTOCLIMATIC VIABILITY FOR CHESTNUT (CASTANEA SATIVA) IN SPAIN. Acta Hortic. 784, 113-118
DOI: 10.17660/ActaHortic.2008.784.16
https://doi.org/10.17660/ActaHortic.2008.784.16
phytoclimatology, chestnut, Castanea sativa, convex hull, suitability
English

Acta Horticulturae