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Hardwood Growth and Yield Model (Growth & Yield 1.1.0)

Hardwood Growth and Yield Model (Growth & Yield 1.1.0). Tim McGrath Rob O’Keefe Brad MacPhee. Project Report 2005. Hardwood GNY Model. Computer model Predicts yields of even-aged single species hardwood stands Compare results of managed vs unmanaged

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Hardwood Growth and Yield Model (Growth & Yield 1.1.0)

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  1. Hardwood Growth and Yield Model(Growth & Yield 1.1.0) Tim McGrath Rob O’Keefe Brad MacPhee Project Report 2005

  2. Hardwood GNY Model • Computer model • Predicts yields of even-aged single species hardwood stands • Compare results of managed vs unmanaged • Help prescribe treatment timing and intensity

  3. CFRU Deliverables • Re-measurement of Hardwood PSPs • Completed 2004 • Refinement of Hardwood GNY Model • Completed 2005 • User Manual/Model description • Draft 2005

  4. Hardwood GNY 1.1.0 • Items to Cover: • Model Development • Demonstration • Application

  5. Development • Objectives: • Refit existing growth function to a PSP database that has nearly doubled in size since 1997 • Investigate updating existing or developing new functions to better capture species group and site class variation

  6. Development HighlightsThe Data • Key Classifications: • Treatment, Species Group, Site Index

  7. 2005 Hardwood Growth and Yield Model Flow diagram of primary functions: Development HighlightsThe Model

  8. Development HighlightsExample: Manage Stand Diameter Function (F18) • Species Group Incorporation • TD as ƒ(SIB,TBA,Species Group) • Model:

  9. 2005 Hardwood Growth and Yield Model 1997 and 2005 Model Performance Comparison: Evaluation Results Tolerant Group Intolerant Group Aspen Group

  10. Demonstration • Single Run Mode • Input • The 7 steps, Help • Output • Definitions, Graphing • Batch Mode • Input • Text files • Output • Text, HTML

  11. Hardwood GNY 1.1.0Input

  12. Hardwood GNY 1.1.0Output

  13. Hardwood GNY 1.1.0Output

  14. Application Samples • Pre-commercial Thinning spacing • Commercial Thinning timing • Commercial Thinning vs no treatment

  15. Pre-Commercial Spacing? 6’x6’ 8’x8’ 6” Dbh 4” Dbh

  16. Commercial Thinning Timing?(Pre-commercial Thin@ 20 to 8’) Thin@35 Thin@50

  17. Commercial Thinning or Not? Thin@60&85

  18. Growth & Yield 1.1.0 • Download model • http://www.gov.ns.ca/natr/forestry/gny2004/growthandyield.htm • Comments • Tim McGrath NSDNR (902) 893-5683 • tpmcgrat@gov.ns.ca

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