Historical and physiographical determinants of tree species distribution in human-dominated boreal landscapes Yan Boucher, Pierre Grondin and Isabelle.

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Presentation transcript:

Historical and physiographical determinants of tree species distribution in human-dominated boreal landscapes Yan Boucher, Pierre Grondin and Isabelle Auger 97 th Annual meeting of the Ecological society of America June 10th 2012

Fire Credits: SOPFEU

Historical logging Credits: Archives Nationales du Québec

Landclearing Credits: Archives Nationales du Québec

Objectives (1) How has land-use history of the last 150 years have influenced stand-replacing disturbance dynamics in the southern boreal forest of Québec, Canada ? (2) How have stand-replacing disturbance dynamics and physiography controlled the present-day tree species composition ? (3) How could this information be used in a context of ecosystem-based management and CC adaptation ?

Study area

Study area Elevation (m) < 2 K people > 10 K people

Historical setting

Fire history: 1820-1899

Fire history: 1900-1924

Fire history: 1925-1949

Fire history: 1950-2005

Fire history reconstruction

Logged area over time

Logged area over time

Logged area over time

Disturbances regime The elevation gradient has dramatically influenced disturbance dynamics The fire regime has been considerably influenced by settlement Logging as extensively affected the study area

Present-day forest analysis Present-day forest composition Cover dominated by Balsam fir (A. balsamea) Black spruce (P. mariana) White birch (B. papyrifera) Trembling aspen (P. tremuloides) Transition matrix species vs environmental variables Logistic regression analysis

Species distribution and elevation

Composition vs. fire history

Composition vs. fire history

Composition vs. fire history

Composition vs. fire history

Composition vs. soil variables

Impact of logging Balsam fir (A. balsamea) (+) Black spruce (P. mariana) (-) White birch (B. papyrifera) (no effect) Trembling aspen (P. tremuloides) (-)

Take-home messages Historical ecology is key to understanding the present and anticipating the future Trembling aspen proliferation is related to fire history and physiography, rather than logging activities Anticipated change in the fire regime could favor trembling aspen and other fire-adapted species Long-term perspectives are needed about the impact of landuse and stand-replacing disturbances

Questions ? yan.boucher@mrnf.gouv.qc.ca