1 / 23

Juvenile Wood in Pines

Juvenile Wood in Pines. Overview. Basics Of Wood Production What Is Juvenile Wood Characteristics What influences Juvenile Wood What Are The Problems With It How To Manage It. Basics of Wood Production. Tracheids. Structure Functions Water transport in the xylem Support Storage.

wallace-maynard
Download Presentation

Juvenile Wood in Pines

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. Juvenile Wood in Pines

  2. Overview • Basics Of Wood Production • What Is Juvenile Wood • Characteristics • What influences Juvenile Wood • What Are The Problems With It • How To Manage It

  3. Basics of Wood Production

  4. Tracheids • Structure • Functions • Water transport in the xylem • Support • Storage

  5. Growth Rings • Trees produce two types of rings during the a growing season • Spring Wood (early wood) • Summer Wood (late wood)

  6. What is Juvenile Wood

  7. Where it is Found • First set of growth rings extending out from the pith of the tree

  8. When it is produced • Is highly variable between species, stands, and individuals • It is produced by all tree, but species and site location play a large part in determining its impact • Can be between 3 to 20 years average of 10 years

  9. Characteristics

  10. Growth rings • Wide growth rings • Ring Age • Uniformity

  11. Growth rings Tracheid characteristics • Wall thickness and tracheid diameter • Tracheid length • Angle

  12. Growth rings SpecificGravity • Tracheid characteristics • Less summer wood in Juvenile wood • Much lower specific gravity

  13. What influences Juvenile Wood

  14. Competition • Live crown • Growth rate • Geographic location

  15. Problem

  16. Strength • Shrinkage • Compression wood formation

  17. Tanzania • South African Forestry Journal – No. 172 March 1995 p 19-23 • Indigenous lumber sources were insufficient for the needs of the country • Plantation of Pinus patula • 60,000 ha planted • 49% of stems consisted of Juvenile wood

  18. How to manage for Juvenile Wood

  19. Stand density • Initial spacing • Spacing and thinning

  20. Fertilization • Increases foliar mass and photosynthetic ability • Decrease in summer wood production and specific gravity • Less pronounced in mature wood • Promotes spring wood production

  21. Irrigation • Early application has same results as seen with fertilization • Promotes spring wood production • Late application prolongs cambial activity • Promotes summer wood production

  22. Removing Competing Vegetation • Early removal promotes seedling growth • Continued removal into the pole stage to reduce competition and increase growth, but promotes juvenile wood • Juvenile wood produced for a longer period of time, but higher specific gravity

  23. Summary • Juvenile wood is in all trees, but can be a problem in rapid growing pine species • It is influence by competition, live crown, growth rate and location • It can be managed by controlling stand density, fertilization, irrigation, and managing competing vegetation

More Related