Silvicultural considerations in established alder stands
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Silvicultural considerations in established alder stands. Jeff DeBell Washington DNR June 10, 2009. Topics. Background Thinning in alder stands Pruning in alder stands Differences between natural alder stands and plantations. Alder Height Growth. Uniform early spacing is critical.

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Silvicultural considerations in established alder stands

Silvicultural considerations in established alder stands

Jeff DeBell

Washington DNR

June 10, 2009


Topics

Topics

  • Background

  • Thinning in alder stands

  • Pruning in alder stands

  • Differences between natural alder stands and plantations


Alder height growth

Alder Height Growth


Uniform early spacing is critical

Uniform early spacing is critical

Alder leans toward openings in the stand

Keep even spacing to keep stems straight


Thinning growing the crown

Thinning – growing the crown


Crowns expand by getting taller as well as wider after thinning

Crowns expand by getting taller as well as wider after thinning


When should you thin

When should you thin?

  • Age 5-10 years

  • Before crown ratio drops below 30%

  • Early gives best diameter; later gives best crown recession

  • Ideal at about age 6-7

    • 50% crown ratio

    • 25-30 feet tall

    • Live crown starts about 15’ from ground


To what spacing should you thin

To what spacing should you thin?

  • Ideally, set spacing based on a relative density measure

  • For a simple approach, thin to a 13’ spacing


Pruning alder

Pruning alder


Pruning lessons from research

Pruning: lessons from research

  • Time of year is not important

  • Small branches heal over more quickly than large ones

  • Decay not an issue

  • Epicormic branches not an issue

  • In young vigorous plantations, clear wood production begins in 2-3 years


How to prune

How to prune

  • Can start as early as age 3

  • Any time of year

  • Wait one growing season if thinned

  • Remove no more than 1/3 of live crown

  • Leave at least 50% live crown ratio


Natural vs planted stands

Natural vs. Planted Stands


Advantages of planted stands

Advantages of planted stands

  • Moderate density = good growth

  • Even spacing = good form

  • Volume concentrated in fewer, larger trees

  • Reach target diameter sooner

  • Higher total volume??


For more reading

For more reading:

  • Can order hard copy from USFS PNW Research Station

  • Ask for PNW-GTR-669

  • Can download PDF at URL below

http://www.fs.fed.us/pnw/publications/gtr669/


Streaming video presentations from red alder a state of knowledge

Streaming video presentations from “Red Alder: A State of Knowledge”

  • Available at University of Washington’s Rural Technology Initiative Website

  • Includes 45 presentations

  • Can order a DVD with all presentations for $10

  • Watch on your computer at http://www.ruraltech.org/video/2005/alder_symposium/index.asp


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