dendroclimatology of pinus resinosa at lac hébécourt, nw québec
DESCRIPTION
Dendroclimatology of Pinus resinosa at Lac Hébécourt, NW Québec Ana, Eddie, Holly, Pam, Rita, Tiffany with lots of help from Dave and Matt. OBJECTIVES Establish a chronology of earlywood, latewood, and total ring width in Pinus resinosa Compare ring width chronology from Lac Hébécourt - PowerPoint PPT PresentationTRANSCRIPT
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