Post on 02-Jan-2016
description
Overview
• Basics Of Wood Production
• What Is Juvenile Wood
• Characteristics
• What influences Juvenile Wood
• What Are The Problems With It
• How To Manage It
Growth Rings
• Trees produce two types of rings during the a growing season
• Spring Wood (early wood)
• Summer Wood (late wood)
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
Specific Gravity– Less summer wood in Juvenile wood– Much lower specific gravity
Growth rings
Tracheid characteristics
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
Fertilization
• Increases foliar mass and photosynthetic ability
• Decrease in summer wood production and specific gravity
• Less pronounced in mature wood
• Promotes spring wood production
Irrigation
• Early application has same results as seen with fertilization
• Promotes spring wood production
• Late application prolongs cambial activity
• Promotes summer wood production
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