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Title:

Juvenile Wood in Pines

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Title: Juvenile Wood in Trees Author: Tom Stefani Last modified by: Tom Stefani Created Date: 4/7/2004 3:30:31 PM Document presentation format: On-screen Show – PowerPoint PPT presentation

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Provided by: TomSt89
Learn more at: http://www.ag.unr.edu
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Tags: growth | juvenile | pines | tree | wood

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Title: Juvenile Wood in Pines


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

12
Specific Gravity
  • Growth rings
  • 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
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