how to do an inventory of your trees
DESCRIPTION
Presentation on how and why to inventory your trees.TRANSCRIPT
March 2004 Potts Tree Farm 1
HOW TO DO AN INVENTORY HOW TO DO AN INVENTORY OF YOUR TREESOF YOUR TREES
Dick Potts
Potts Tree Farm
Holmes County, Ohio
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Reasons for InventoryReasons for Inventory
Basic Business Process:What’s in stockWhat’s its valueWhat’s for sale
Tree Farming:Timber management
Timber sale
Timber value
Timber basis
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How to InventoryHow to Inventory
Count them ALL - 100% inventory!
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What Information is Needed?What Information is Needed?SiteSoil, Slope, Orientation, Aspect, Elevation, Watershed, Site Index
TreesSpecies, DBH, Height, Logs (16’), Quality, Acceptable Growing Stock (AGS), Unacceptable Growing Stock (UGS), Sawtimber, Pole, Sapling, Cull, Understory, Regeneration, Number of Trees
ResultsStocking (Chart or %), Basal Area, Board Feet (BdFt) Sawtimber, Sawtimber Value, Tons or Cords Pulp, Rings per Inch
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Which Trees Are Yours?Which Trees Are Yours?Where are your boundaries?Survey, Corners, Line Markers, Acreage
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PropertyPropertyMapMap
Very Very UsefulUseful
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Inventory MethodsInventory Methods
100% inventory High accuracy but requires time and effort
1/10th Acre Plots 66’ square, multiply by 10 for per acre approximation
1/5th Acre Plots 53’ radius, multiply by 5 for per acre approximation
Variable Radius Plots Most widely used for speed and sufficient accuracy
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SamplingSampling
Approximate Methods Require Statistical Random Sampling
Location of PlotsRandom with no overlapping
Stay away from edges and unusual areas
Number of Sample PlotsDepends on total area size
~10 or greater is desirableReference:
Avery and Burkhart 1994, Forest Measurements, 4th ed., McGraw Hill, Inc., New York.
Ashley 1991, Simplified Point-Sample Cruising, USDA FS, NA-UP-01-91.
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Variable Radius PlotVariable Radius Plot
Instruments Biltmore Stick – Angle Gauge
Glass Prism
Penney – Angle Gauge
Basal Area Factor (BAF) Most common BAF = 10
Results Basal Area = BAF X “trees IN”
Stand Density Measure
Reference: McEvoy, How Point Sampling Works, Forest Products EQUIPMENT, Vol. 11, No. 7, March 2003, pp. 24….
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Number of Tree per AcreNumber of Tree per AcreCount in 1/10th or 1/5th Acre Plots then convert to one acre
Use Variable Radius Plot Data then calculate Expansion Factor for each tree and sum for number
Calculation of Expansion Factor (EF)
EF = BAF/(.005454 x N x D x D) for individual tree
BAF = 10 N = # sample points D = DBH
Example: EF = 10/(.005454 x 10 x 11 x 11) = 1.5 trees/acre
Sum EF for all trees in Plot for number of trees per acre.
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Stocking ChartStocking ChartPlot of Basal Area vs Trees per Acre
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Data Analysis by ComputerData Analysis by Computer
Create your own spreadsheet for data entry and calculations
Use available software
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Commercial SoftwareCommercial Software
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Freeware - USFSFreeware - USFS
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Freeware - USFSFreeware - USFS
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Freeware - USFSFreeware - USFS
Northeast, Central States, Lake States Versions
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Example TWIGS ResultsExample TWIGS Results
2004 Harvest – Clearcut1986 Inventory Projected to 2001 10,832 BdFt/acre
1997 Inventory Projected to 2002 12,629 BdFt/acre
2002 Sale Inventory 14,167 BdFt/acre
1989 Harvest – Clearcut1987 Inventory 12,755 BdFt/acre
1989 Inventory Koral’s data (TWIGS) 10,692 BdFt/acre
1989 Inventory Koral’s data (SILVA) 10,175 BdFt/acre
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TWIGS Information and DataTWIGS Information and Data
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Data CollectionData Collection
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TWIGS DataTWIGS Data
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TWIGS Data FileTWIGS Data File
Generate TWIGS data file with the program TREEGEN
Switch to TREEGEN and TWIGS