1 / 26

JABOWA

JABOWA. Janick , Botkin , and Wallis Individual tree Not location dependent ‘gap model’. Driving equation is diameter. Mitscherlich equation Diameter growth = G * LIGHT * AET * TEMP … G (max growth) based on record trees LIGHT based in physiologic experiments

tan
Download Presentation

JABOWA

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. JABOWA • Janick, Botkin, and Wallis • Individual tree • Not location dependent • ‘gap model’

  2. Driving equation is diameter • Mitscherlich equation • Diameter growth = G*LIGHT*AET*TEMP … • G (max growth) based on record trees • LIGHT based in physiologic experiments • AET, TEMP etc. based on natural range

  3. 3 Modules (can be turned on/off) • Birth • Growth • Death

  4. Birth • Stochastically adds saplings • Based on total leaf area of species in the plot

  5. Growth • Must have estimate of growth potential • Diameter growth = G*LIGHT*AET*TEMP … • Record trees or backcasting estimate • For short term growth • Asymptotic growth based on maximum age

  6. Foliage

  7. Light • What reaches top of tree • Uses Beers-Lambert light extinction law • Neutral density filter

  8. Quadratic 100% Potential growth Temperature (degree days)

  9. Quadratic 100% Potential growth AET

  10. Kill • Expectation = 4/AgeMax [for ‘normal growth rates] • Slow growers 99% (for 10 years)

  11. Some details • Only grows dbh • Everything else is regressed • FORET (problems with over parameterization) • Competition • Plot size is crucial [10m X 10m is basic]

  12. TASS • Tree And Stand Simulator • Individual tree model • Location dependent • Based on crown development • Grows crowns • Wood is a regressed set of variables

  13. The petri dish

  14. Greatest development was based on Douglas fir • First structured on white spruce • Eventually modified for other species • Based on the concepts of ‘lollipops’ • First proposed by David Smith in the 60’s

  15. Assumption of a repeatable crown shape • First proposed by Halle in the early 70’s • Based on theory of reiterative branching patterns • Douglas fir is parabolic

  16. Paraboloid 10 Decreasing at a decreasing rate 7 10 10 7 5 10 7 5 4 10

  17. Branches disappear

  18. Foliage contribution

  19. Bole increment • BI = aFVk

  20. Pressler’s Law

  21. The lollipop concept

  22. Lollipop + Pressler = bole

  23. How to get differentiation

  24. Death • Any tree where leader is overtopped

  25. Back to the petri dish

More Related