Change in aspen density over a range of height ratio classes in the SBPSxc

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

1.00- 1.25

1.26- 1.50

1.51 -1.75

1.76- 2.00

2.01- 2.25

2.26- 2.50

2.51- 2.75

2.76- 3.00

3.01- 3.25

3.26- 3.50

3.51- 3.75

3.76- 4.00

4.01- 4.25

4.26- 4.50

4.51- 4.75

4.76- 5.00

5.01- 5.25

5.26- 5.50

5.51- 5.75

5.76- 6.00

6.01+

Tall aspen height/target pine height

Mean n

um

ber

of

aspen s

tem

s

in 2

.52m

subplo

t

Clusko 2001No Spacing

0.0

0.5

1.0

1.5

2.0

2.5

1.00- 1.25

1.26- 1.50

1.51 -1.75

1.76- 2.00

2.01- 2.25

2.26- 2.50

2.51- 2.75

2.76- 3.00

3.01- 3.25

3.26- 3.50

3.51- 3.75

3.76- 4.00

4.01- 4.25

4.26- 4.50

4.51- 4.75

4.76- 5.00

5.01- 5.25

5.26- 5.50

5.51- 5.75

5.76- 6.00

6.01+

Tall aspen height/target pine height

Mea

n nu

mbe

r of

asp

en s

tem

s in

2.5

2m s

ubpl

ot

Clusko 2008No Spacing

Change in aspen density over a range of height ratio classes in the SBPSxcChange in aspen density over a range of height ratio classes in the SBPSxc

2

IDFdk3IDFdk3The vicious aspen was not as bad as it looked!The vicious aspen was not as bad as it looked!

20 years old ( not brushed)20 years old ( not brushed)

6 years old6 years old

3

SBSdw1SBSdw1Pine and aspen: a different storyPine and aspen: a different story

10 year old pine10 year old pine

Recommended changes from research Recommended changes from research trial resultstrial results

Subzone & site series

AT/PL ht ratio Density FG min pine ht

SBPSxc 01 None None 1.4

IDFdk3 01 125% 3000 1.4

SBSdw1&2 01 125% 1000 2

4

Note: •Only for pine at free growing height•Only for zonal sites

Research suggests that current provincial guidance with Research suggests that current provincial guidance with regard to aspen competition in pine stands could use regard to aspen competition in pine stands could use

some tweakingsome tweaking

• Research is only on one site – is this valid?• We only studied pine and aspen but there are other species out

there• Results we have developed are for pre-brushing surveys. What

about post-brushing?• And what about other similar ecosystems?• What do you mean other values???? Could the changes affect

something else?5

Verifying the broad application of the resultsVerifying the broad application of the results

6

• With operational assistance we sampled a range of operational sites across a variety of subzones.

Why Verify?Why Verify?• Broad application of research

results from just one site is not recommended: we collected information to determine if the research could be extended across the same unit

• For inclusion of similar ecosystems: we can’t afford to complete research in every subzone so we collected data to determine if we could extend the research across other ecosystems

Other ecosystems in the Cariboo with aspen Other ecosystems in the Cariboo with aspen communities as defined by the “Expert System”communities as defined by the “Expert System”

7

BEC Area(km2) Site series

01 02 03 04 05 06 07 08 09

ESSFxv1&2 3802 X X AT (L) X X X X X X

ICHdk 425AT (H)

AT-EP-AC (H)AT (L) X AT (M)

EP-AT-AC (H)AT (H)

EP-AT-AC (H)AT (H)

AT-EP-AC (H)EP-AC-AT

(H)X

ICHmk3 1123AT (M/H)

EP-AT-AC (M/H)X X

AC-EP-AT (H)AC-EP (H)

AC-EP (H) EP-AC-AT (H) X

ICHmw3b 32

ICHwk2 172601a: AT-EP-AC (M)01b: AT-EP-AC (H)

X X EP-AT-AC (L/M) X X AT-EP-AC (H) X

ICHwk4 607 AT-EP-AC (M) X X X AT-EP-AC (L/M) X AT-EP-AC (H) X

IDFdk1b 20

IDFdk3 8953 AT (M) AT (M) X AT (M) X X AT (L) AT (M) X

IDFdk4 3994 AT (M) AT (L) X AT (M) AT (H) X X AT (M) AT (M)

IDFdwa 1009

IDFmw2b 147

IDFxm 237301a: AT (M)01b: AT (M)

X X X X X EP (H) X X

SBPSdc 4227 AT (M) X X X X X X X

SBPSmca 1165

SBPSmk 5658 AT (M) X AT (M) X X X X X

SBPSxc 10,898 AT (H)c X X AT (H) X AT (H)

SBSdw1 3443AT (M)

EP-AT (M)X X X X EP-AT (M) AT-EP (M/H)

AT (M/H)X X

SBSdw2 2567 AT (M) X X X X X X AT (M/H) EP (H)

SBSmh 789AT-EP-AC (H) EP (M) X X EP (H) EP (H) EP-AC (H) EP-AC (H)

AC (H)AT-AC-EP

(M)

SBSmmb 87

SBSmwd1374

AT-EP-AC (M/H)AT (H)

X X X X X X X X