Role of wind in forest openings in the southern portion of the spruce-lichen woodland, Québec, Canada
André ROBITAILLE
Université Laval, Saint-Laurent ile d'orléans, Québec Canada
This study presents the impacts of wind activity following forest fires over several
thousand square kilometres in the southern portion of the spruce lichens
woodlands in the province of Québec. This phenomenon had not been studied,
and compared to other regions of the Canadian boreal zone wind activity in this
area it is unique in its intensity and progression. Effects of wind, sand dunes and
blowouts, occur in many areas between the 51st and 53rd degree of northern
latitude, corresponding to the transition between the spruce-moss forest and
spruce-lichen woodlands. The study uncovered huge areas composed of waterdeficient
sandy soils. There are indications that increased wind activity triggered
by forest fires led to the development of aeolian erosion and sand dunes in this
region. This phenomenon leads to the loss and degradation of forest soil and most
likely contributes to opening up forest cover over a long period of time, notably by a
return to a primary stage of soil development. According to our observations, wind
effects increase following forest fires in this region. In addition, a hypothesis was
derived that the effect of the wind in winter can damage the forest regeneration
and maintains low density forests. For the Circum Boreal Vegetation Mapping
project we suggest to integrate into the legend a specific codification which would
allow indicating this type of natural disturbance when it affects vast territories.
It should be the same for regions with higher rates of fire recurrence and those
periodically affected by insect epidemics.
© 2012 Organizing Committee
| | |