|
|
Tree ring
research on conifers in the Alps |
|
| ||||||
|
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
stationnelles. Schweizerische Zeitschrift für Forstwesen, May 1996, vol 147, n 5, 351-363.
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 (n).
|
|
|
