Rolland C. (1996).
Croissance du Pin à crochets (Pinus uncinata Mill. ex Mirb.) dans la
Réserve Naturelle des Hauts-Plateaux du Vercors. Revue Forestière
Française, XLVIII, 2, 144-151.
- TITLE Mountain pine growth (Pinus uncinata
Mill. ex Mirb.) in the Réserve Naturelle des Hauts-Plateaux du Vercors
- LANGUAGE French
- SUBJECT Ecology, Radial and height tree
- KEY WORDS
- SPECIES Pinus uncinata Mill. ex Mirb.
- SITES Hauts-Plateaux du Vercors, South-East
of France, Alps.
The growth of the mountain pine (Pinus uncinata Mill. ex Mirb.) is
studied in the Vercors mountains (France), between 1570 and 1700 meters on an
Eastern slope, on calcareous soil (dry lapiaz). 200 cores were taken on 100
dominant trees and 12 874 ring-widths were analysed. The mean tree height is
8.8 meters (10.3 m at 100 years), the average trunk diameter is 24.7 cm and
the mean sensitivity reaches MS=0.275. The average ring-width measures 2.66 mm
(with a mean tree age of 69 years). Results have shown that the mean area of
sapwood represents 69 % of the whole basal area, and the heartwood formation
begins near 20 years for this species. Radial growth curves as a function of
tree age were calculated in 10 sites after measuring all the ring-widths. It
reveals that the mean ring-width decreases rapidly with the age, since it
measures 2.68, 1.81, 1.34 and 0.94 mm at respectively 25, 50, 75 and 100