A Dendroecological Analysis of Eastern Larch (Larix laricina) in subarctic Quebec

1990

S. 1312-1319

4 Abb., 3 Tab., 29 Lit. Ang.

Unselbständiges Werk

200088950

Two new dendrochronological series of eastern larch (Larix laricina (Du Roi) K. Koch) from subarctic Quebec extend from 1710 to 1987 (Whapmagoostui- Kuujjuarapik), eastern Hudson Bay) and from 1596 to 1978 (Riviere aux Feuilles, western Ungava). In both regions, the tree-ring series show similar long-term variations. Generally, conditions were more favorable for growth at the end of the 19th century and during the 20th century than before. A comparison of several larch and white spruce (Picea glauca (Moench) Voss) tree-ring series from northern Quebec indicates significant shared variance between regions and species. Larch chronologies show two important depressions during the 20th century, between 1905-1908 and 1940-1946, which are more obvious in the two series, from the southern forest-tundra than in the series from Ungava. These may be caused by outbreaks of the larch sawfly, Pristiphora erichsonii (Htg.).