Productive Young Growth
description
Transcript of Productive Young Growth
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Productive Oldgrowth
2nd Growth
Non-Forest
Forested, low productivity
Productive Young Growth
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Productive Oldgrowth
2nd Growth
Non-Forest
Forested, low productivity
Productive Young Growth
VC4 = 8-20
VC5 = 20-30
VC6 = 30-50
VC7 = 50+
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1980s Forest Inventory
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0.0
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VC4 VC5 VC6 VC7
Ne
t B
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olu
me
1980s Forest Inventory
1979 Timber Type Volume Classes
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Low Medium High
Net
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rd F
oot V
olum
e (1
,000
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1980s Forest Inventory
1997 TLMP Volume Strata
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Productive Oldgrowth
2nd Growth
Non-Forest
Forested, low productivity
Productive Young Growth
Low
High
Medium
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“Richest old-growth stands and less-valuable stands are lumped into one class, high
volume”
Wildlife Biologist, John Schoen
(Defenders 1998)
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Crab Bay ( VCUs 232-234 )
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Crab Bay
SE Chichagof Landscape Analysis
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SE Chichagof Landscape Analysis
Timber harvest has been disproportionately concentrated on
alluvial/colluvial surfaces
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N
Crab Bay
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N
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N
Crab Bay
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N
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Timber Type
N
VC 6
VC 6
VC 6VC 6
Crab Bay
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N
Volume Class 4
Volume Class 5
Volume Class 6
Clear Cut
Crab Bay
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Crab Bay
Volume Class 4
Volume Class 5
Volume Class 6
Clear Cut
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Harvested
VC 6 & 7
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Volume Class 4
Volume Class 5
Volume Class 6
Clear Cut
N
Volume Class 5
Volume Class 6
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VC5 VC6
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adra
tic
Mea
n D
iam
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VC5 VC6
Tre
es
pe
r A
cre
(n=19)(n=25)
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VC5 VC6% o
f p
lots
wit
h t
rees
> 4
0"
(n=19)(n=25)
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Volume Class 5
Volume Class 6
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Volume Class 5
Volume Class 6
Timber Volume?
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VC5 VC6Tim
be
r V
olu
me
(1
,00
0s
)
(n=19)(n=25)
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N
Volume Class 4
Volume Class 5
Volume Class 6
Clear Cut
Crab Bay
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1994 Lawsuit
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1994 - Timber Volume Paradigm
* Proportionality
* Wildlife Studies/Models
* Volume Distribution Pie Charts
* Allowable Sale Quantity (ASQ)
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TLMP Volume Strata (1997)
L
M
H
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Deconstructing the timber volume paradigm in the
management of the Tongass National Forest
(Caouette, Kramer, & Nowacki 2000. PNW GTR)
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High Volume
High Density Forest
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We need better quantifiable mapping objectives
(Caouette, Kramer, & Nowacki 2000. PNW GTR)
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1980s Forest Inventory
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1980s Forest Inventory
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2
6
4
5
1 200’
3
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1980s Forest Inventory
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1990s Forest Inventory
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V67V4
V4-N V4-S
AspectSouth**North*
V5
V5-H V5-S
AspectSouth**North*
V5
V4-H
Productive Old Growth
* North = 292.5 -- 57.5 + flat (no aspect)
** South = 67.5 -- 292.5 degrees
V67
Yes No Yes NoHydric Soils
V5-HV4-H V4
V5-N
V67
Hydric Soils
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1980s Forest Inventory
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1990s Forest Inventory
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V4-HV4-NV4-SV5-HV5-NV5-SV67
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