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First Measurements of 2005 GGTIV* Installations
Eric C. Turnblom, SMCKeith Jayawickrama, NWTIC
SMC Spring Policy Meeting, 25 – 26 Apr 2007 Vancouver, WA
* Genetic Gain (NWTIC) / (SMC) Type IV joint trials
First Measurements of 2005 GGTIV Installations
• Background: Objectives / Design
• Data & Methods
• PRELIMINARY Results: Survival, Height, basal diameter, crown width
• Summary
Background: Objectives / DesignObjectives:
• Provide information to guide managers currently applying combinations of genetics, spacing and vegetation control
• Provide linkages with other studies (such as Genetic Gain Trials, intensive ‘veg’ mgt. trials, spacing trials (like SMC Type III), that will assist modeling
• Compare realized gains (per unit area basis) with predicted gains (individual tree basis)
• Compare estimates of growth and yield parameters for populations with different expected growth potentials
Background: Objectives / Design
Three Treatment Factors:
1) Genetic Gain levels
• (G1) Unimproved
• (G2) Intermediate gain Type IV Trial portion does NOT use this level
• (G3) Elite gain
Background: Objectives / Design
Three Treatment Factors:2) Spacing levels
• (S1) 15 x 15’, nominally 200 SPA
• (S2) 10 x 10’, nominally 440 SPA Genetic Gain Trial uses ONLY this density
• (S3) 7 x 7’, nominally 900 SPA
Background: Objectives / Design
Three Treatment Factors:
3) Vegetation Control levels
• (V1) Current Practice Defined as single site prep; used ONLY in
Type IV
• (V2) Complete Defined as 80% or greater bare ground until
crown closure; standard on all GGT plots and on Type IV
GGTIV General Site Layout
G2
G1(S2 V2)
G1
G2
G3 G1
G3 G3(S2 V2)
G2
G1
G3
G2
G2
G1 G3G3 S1
V1
G3 S3V2
G1 S2V1
G1 S3V2
G3 S3V1
G1 S1V2
G3 S1V2 G1 S2
V1
First Measurements of 2005 GGTIV Installations
• Background: Objectives / Design
• Data & Methods
• Analysis Results: Survival, Height, basal diameter, crown width
• Summary
2005
2006
601
602
603
604
605
606
GGTIV Installation Locations (apprx.)
601 – Donkey Creek 2
602 – Donaldson Creek
603 – Crane Creek 2
Data & Methods
• Measurements– Basal diameter at 6 in. on 100% sample– Diameter Breast Height on 100% of trees
that have it– Total height on 100% sample– Crown Width, two perpendicular directions
on 42 tree sample– Height to Live Crown on 42 tree sample– Comments where warranted (Ex. BR,
browsed; DE, dead; etc.– Record genetic family tab number on elite
and moderate gain stock
Data & Methods
• Model(s)
I denotes installation, B denotes block
G denotes gain: low, mod, high (-1,0,1)
S denotes spacing: sparse, mod, dense (-1, 0, 1)
V denotes veg. control: standard, complete (0,1)
1 1 2 2 3 3
4 1 18 15
2 219 20 21 22 23
24 25 26
ijklmn
ijklmn
y I I I
B B
G G S G S S
V G V S V e
First Measurements of 2005 GGTIV Installations
• Background: Objectives & Design
• Data & Methods
• PRELIMINARY Results: Survival, Height, basal diameter, crown width
• Summary
2 Growing Season Results: Survival Estimated survival (%) - 1st Meas 2005 GGTIV
0
0.2
0.4
0.6
0.8
1
1.2
7x7 10x10 15x15Spacing (ft.)
woods run moderate high
2 Growing Season Results: Height Estimated Height - 1st Meas. 2005 GGTIV
1
1.2
1.4
1.6
1.8
2
2.2
2.4
2.6
7x7 10x10 15x15Spacing (ft)
Av
era
ge
To
tal H
eig
ht
(ft)
woods run moderate high
2 Growing Season Results: Diameter Basal Diameter - 1st Meas 2005 GGTIV
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
7x7 10x10 15x15Spacing (ft.)
Ba
sa
l Dia
me
ter
(in
.)
woods run moderate high
2 Growing Season Results: CW Estimated Crown Width - 1st Meas. 2005 GGTIV
0.9
1
1.1
1.2
1.3
1.4
1.5
7x7 10x10 15x15Spacing (ft)
Av
era
ge
Cro
wn
Wid
th (
ft)
woods run moderate high
First Measurements of 2005 GGTIV Installations
• Background: Objectives & Design
• Data & Methods
• PRELIMINARY Results: Survival, Height, basal diameter, crown width
• Summary
Summary
• These results are PRELIMINARY
– Based on exactly HALF the number of observations we’ll eventually have
• There is strong evidence for installation level effects on all response variables (p< 0.0001)
– Growing season length?
– Animal / critter damage?
– Other local effects …
Summary
• These results are PRELIMINARY– Based on exactly HALF the number of
observations we’ll eventually have
• Survival was marginally better at narrowest spacing after two years (p=0.0464)– Potential interaction between gain level and
spacing – high gain survived better at widest spacing, woods run at narrowest
• Height was seemingly affected by spacing (p=0.0294) after two years– Effect appears to be small at this stage
Summary
• These results are PRELIMINARY– Based on exactly HALF the number of
observations we’ll eventually have
• Basal diameter affected marginally by gain level (p=0.0574) stronger evidence for spacing effect was observed (p=0.0323), though small in magnitude– Very slight evidence of optimum at middle
density
• Crown width seemed strongly affected by gain level (p=0.0077), slightly by spacing (p=0.0505)– Narrower crowns in high gain level
Questions / Comments?
www.standmgt.org
First Measurements of 2005 GGTIV Installations
