Rolland C., Schueller
J. (1996). Dendroclimatologie du Pin à crochets (Pinus uncinata
Mill. ex Mirb.) dans le Briançonnais et le Queyras en fonction des conditions
Schweizerische Zeitschrift für Forstwesen, May
1996, vol 147, n 5, 351-363.
- TITLE Dendroclimatology of the Mountain Pine
(Pinus uncinata Mill. ex Mirb.) in the Briançonnais and Queyras in
various growth conditions
- LANGUAGE French with English and German
- SUBJECT Ecology, Response to climate.
- KEY WORDS Dendroecology, Pinus uncinata,
French Alps, Climate, Response functions.
- SPECIES Pinus uncinata Mill. ex Mirb.
- SITES Blétonnet, Péméant, Granon,
Euseullières, Croix de Toulouse, Infernet, Jalavez, Queyras, Briançonnais,
South-East of France, Alps.
In the internal French Alps, 15 mountain pine forests (with Pinus uncinata
Mill. ex Mirb.) are studied using dendroclimatological methods. The sampled
sites are chosen at different altitudes, exposures and kinds of soil.The
influence of these three environmental factors on tree-ring and climate
relationships is studied by computing in all the forests the correlation
functions between tree-rings and monthly climate. Then the results are
compared with a factor analysis. All the sites show a positive influence of
the precipitation in August and September during the previous year (n-1),
before the ring formation, and at the same time a negative effect of high
temperatures. Rainfall in June (n) is also favourable to radial growth.
However, at lower altitudes the growing period begins earlier. Moreover, the
influence of the precipitation in August and September (n-1) is also stronger
there. On the contrary, the climatic response of the trees is reduced on
siliceous soils where the water reserve is higher. The limiting effect of the
high temperatures is enhanced by the exposure on South facing slopes, whereas
on northern slopes the growing period appears to be longer, until September