1 why use count plots? a comparison of various count to measure ratios in the bc interior presented...
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Why Use Count Plots?
A Comparison of Various Count to Measure Ratios
In the BC Interior
Presented by:Jim Wilson RFT, ATE
May 2008
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Overview Why are we sampling?
What are we sampling?
Why sample with count plots?
Variations of count plots
Study
Results
Recommendations
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Why are we sampling?
Cost prohibitive to measure every tree
For appraisal purposes, we require cruise estimates to calculate the stumpage rate
Decision is based on: What sampling error can we live with based
on our budget?
unfortunately, the min 2SE is set for us
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What are we sampling? For appraisals – net volume ±15% 2SE
Sampling for net volume has two equal parts:
BA/ha (tree count) VBAR (measure trees)
We could just as easily sample for any other attribute: $ value, stems/ha, etc.
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What are we sampling?
Questions:
Are the items to sample:
More or less variable?
More or less costly to collect?
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Why sample with count plots? More variability, more samples needed
Tree count is usually more variable than the measure trees
Counting trees is easy and cheap, measuring trees is costly
Measuring trees is 50% of the answer, getting tree count is the other 50% You decide how much of each to sample
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Variations of Count Plots
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Variations of Count Plots
Which sample better covers the ground and covers the variability of the stand?
Selecting trees with a Big BAF better distributes measure trees – more efficient
Count:Measure plots clump measure trees into clusters – less efficient
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Study Selected 7 interior cutting permits Northern and Southern Interior Stand types: SB, FPyL, Pl(S) All full measures:
Randomly selected plots to start Ratios 0:1, 1:1, 2:1, 3:1, 5:1 (count:measure) Graphed net vol/ha, ISR $/m3, cruising costs
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Results : Net Vol/ha SB stand
0
100
200
300
400
500
Ratio 0:1 Ratio 1:1 Ratio 2:1 Ratio 3:1 Ratio 5:1
$0
$2,000
$4,000
$6,000
$8,000
Net Vol/ha
Crew Costs
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Results: Stumpage Rate SB stand
0
10
20
30
40
50
Ratio 0:1 Ratio 1:1 Ratio 2:1 Ratio 3:1 Ratio 5:1
$0
$2,000
$4,000
$6,000
$8,000
ISR $/m3
Crew Costs
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Results : Net Vol/ha PlS stand
0
50
100
150
200
250
300
350
Ratio 0:1 Ratio 1:1 Ratio 2:1 Ratio 3:1 Ratio 5:1
$0
$2,000
$4,000
$6,000
$8,000
Net Vol/ha
Crew Costs
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Results: Stumpage Rate PlS stand
0
5
10
15
20
25
Ratio 0:1 Ratio 1:1 Ratio 2:1 Ratio 3:1 Ratio 5:1
$0
$2,000
$4,000
$6,000
$8,000
$/m3
Crew Costs
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Results
Tree Count CV:
SB stand:0:1 – 5:1 86 plots - 39%
PlS stand:0:1 – 5:1 117 plots - 38%
Each of the runs by stand had the same number of plots and therefore the same CV
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Results
VBAR CV: SB stand:
0:1 – 397 trees - 28% 1:1 – 195 trees - 28% 2:1 – 136 trees - 28% 3:1 – 107 trees - 29% 5:1 – 74 trees - 30%
PlS stand: 0:1 – 653 trees - 23% 1:1 – 337 trees - 24% 2:1 – 212 trees - 22% 3:1 – 161 trees - 24% 5:1 – 117 trees - 23%
Why are we measuring so many trees?
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ResultsTrends:
Net vol/ha does not change using count plots averaged within ± 2%
Stumpage rate does not change using count plots averaged within ± 5%
CV is stable for VBAR (we are measuring too many!)
Cruising costs are 30% less using 1:1 ratio and 50% less using 5:1 ratio versus full measure plots
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ResultsOptimal solution to reach 15% 2SE
(using Kim Iles’ star_bar.xls):
SB stand: Using TC CV of 39% and VBAR CV of 28% 41 count plots & 41 VBAR trees Equivalent to 3.5 counts to 1 measure plot
PlS stand: Using TC CV of 38% and VBAR CV of 23% 37 count plots & 31 VBAR trees Equivalent to 7.2 counts to 1 measure plot
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Recommendations Use count plots in highly variable stands to
meet sampling error (more counts)
Use count plots in homogenous stands to decrease effort (less measure trees)
Use count plots in partial reduction areas
Use Big BAF to select measure trees and increase efficiency
Use count plots and spread out the trees!
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AcknowledgementsSrdjan Kragulj, RPF Timberline - Vancouver he helped provide all the stumpage calculations for each of the runs Kim Iles, PhD for spoon feeding me time and time again his STAR_BAR.xls program should be used by everyone to plan
cruises
John Bell, PhD for his short course and newsletter
(http://www.proaxis.com/~johnbell/)
Walter Bitterlich, PhD for making cruising so much easier
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Questions?
Jim Wilson, RFT, ATE
Cruise Compilation Manager
Timberline Natural Resource Group
Phone: 604-714-2897
Cell: 778-858-9123