Dendroclimatology of Pinus resinosaat Lac Hébécourt, NW Québec

Ana, Eddie, Holly, Pam, Rita, Tiffanywith lots of help from Dave and Matt

OBJECTIVES

• Establish a chronology of earlywood, latewood, andtotal ring width in Pinus resinosa

• Compare ring width chronology from Lac Hébécourtwith 2 chronologies from Ontario

• Examine relationships between climatic variables and our ring width chronologies

SITE DESCRIPTION

Lac HébécourtIslands 12, 14, and15 (SW portion of lake)

TopographySteep--> gentle

SoilsThin over bedrock

Island vegetationSpruce, fir, red pine, cedar, and paper birch

METHODS

2 cores/tree x 30 trees from three islands (#12, 14, 15)

Cores sanded and crossdated

COFECHA

ARSTAN

Correlation Analysis

0

1

2

1850 1900 1950 2000Year

Sta

nd

ard

ized

Ch

ron

olo

gie

s

EW

LW

TRW

0

1

2

0 0.5 1 1.5 2TRW

EW

0

1

2

0 1 2TRW

LW

0

1

2

0 1 2EW

LW

Inter-ring relationshipsr=0.97

r=0.65

r=0.49

0

1

2

0 0.5 1 1.5 2Lac Hebercourt

Te

ma

ga

mi

0

1

2

0 1 2Lac Hebecourt

Dix

on

Lak

e

0

1

2

0 1 2Dixon Lake

Tem

agam

it

Comparisons withother chronologies

r=0.14

r=0.06

r=0.51

Comparison with other chronologies

0

1

2

1850 1900 1950 2000Year

Sta

nd

ard

ized

Ch

ron

olo

gie

s

Dixon Lake

Temagami

Lac Hebecourt

1910 1920 1930 1940 1950 1960 1970 1980 1990 2000

LW

PPTEr = 0.18

Time series of summer precipitation and latewood index

Period of Records for the Meteorological Stations in Regional Climate Average

1890 1910 1930 1950 1970 1990

Abitibi Post

Amos

Cochrane

Duparquet

Iroquois Falls

La Sarre

Kinojevis

Val St-Gilles

Harricana

1910 1920 1930 1940 1950 1960 1970 1980

LW

PPTE

1980 1990 2000

r = 0.11

r = 0.70

-0.6

-0.4

-0.2

0.0

0.2

0.4

0.6

-0.6

-0.4

-0.2

0.0

0.2

0.4

0.6

S O N D J F M A M J J A S

Month

Average Temperature

EW

LW

-0.6

-0.4

-0.2

0.0

0.2

0.4

0.6

-0.6

-0.4

-0.2

0.0

0.2

0.4

0.6

S O N D J F M A M J J A S

Month

Precipitation

EW

LW

0.4

0.6

0.8

1.0

1.2

1.4

1.6

100 120 140 160 180 200 220 240

Winter Precipitation (mm)

Ear

lyw

oo

d i

nd

ex

0.4

0.6

0.8

1.0

1.2

1.4

1.6

150 200 250 300 350 400

Late Summer precipitation (mm)

Lat

ewo

od

In

dex

r = -0.82

r = 0.70

CONCLUSIONS

• Successfully crossdated Pinus resinosa in Lac Hébécourt, Québec

• Established a 216 year chronology (1786-2001) for the area

• Chronology does not compare closely with other established chronologies in region

CONCLUSIONS

• Correlation between ring widths and regional climate strongest with nearby climate data

• Strongest correlations between ring width indices and climatic data were:

(1) latewood index and late summer precipitation (positive)

(2) earlywood index and winter precipitation (negative)

FUTURE DIRECTIONS

• Obtain better localized climate data (longer series)

• Climatic reconstruction will be difficult due to the conflicting climate response of winter and summer precipitation

• Control of measurement error

• Complete core analysis

• Further analysis of the residual and autoregressive chronologies could be explored

• Compare chronologies with other species in the region for indication of pointer years