First Measurements of 2005 GGTIV* Installations Eric C. Turnblom, SMC Keith Jayawickrama, NWTIC SMC...

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?

ect@u.washington.edu

www.standmgt.org

First Measurements of 2005 GGTIV Installations