Schueller J. (1994). Relationships between Mountain Pine rings and climate
in the French Pyrenees (Font-Romeu) studied using the radiodensitometrical
method. Pirineos, Jaca, vol 143-144, pp 55-70.
- LANGUAGE English, with French and Spanish
- SUBJECT Ecology, Response to climate
- KEY WORDS Wood density, Pine, Climate
- SPECIES Pinus uncinata Ramond.
- SITES Font-Romeu, French Pyrenees, South-West
A radiodensitometrical study was carried out on 46 Pinus uncinata
(Ramond) in Font-Romeu (French Pyrenees). Correlation functions with monthly
climatic data were calculated using separately the ring-widths, the earlywood
and the latewood densities. The Mountain Pine shows narrow rings (1.5 mm) and
a high sensitivity to climate (MS = 0.221), but it does not seem to suffer
from drought despite the dryness of the climate (788 mm rainfall per year).
This species is more sensitive to temperature than to precipitation, since
temperature governs latewood formation. A hot spring and a mild autumn with
maximum temperatures above threshold levels will extend the growing period. A
warm autumn also increases the latewood density, whereas cold nights during
the previous year's autumn are unfavourable to growth because they may affect
the cambium and bud initiations.