what’s in your woodpile? gary johnson urban and community forester university of minnesota
TRANSCRIPT
What’s in Your Woodpile?
Gary Johnson
Urban and Community Forester
University of Minnesota
Approved Firewood Required on State- Owned Land
Obtained from firewood distribution facility on State-owned land
Obtained from a firewood dealer approved by the DNR commissioner
DNR commissioner approved firewood.
Penalties: After May 1, 2008 Confiscation of firewood, and
$100 penalty (purchaser), or
$100 penalty for each sale (dealer)
*Firewood: any wood intended for campfire.
Softwood versus Hardwood
Softwoods have Tracheids (fibers), No Vessels (pores). Many have Resin Canals.
Resin Canals
Softwoods versus Hardwoods
Hardwoods have Fibers and Pores
Pores
Ring Porous versus Diffuse Porous Large Pores in Earlywood and Small Pores
in Latewood = Ring Porous Hardwood
Large, obvious lines are Earlywood.
Smaller,darker heartwood or lighter sapwood lines are Latewood.
Ring Porous Wood: Black Ash
Ring Porous Wood: Bur Oak
Ring Porous Wood: American Elm
Semi Ring Porous: Black Walnut
Ring Porous versus Diffuse Porous Pores about same size and distributed
evenly throughout growth ring = Diffuse Porous.
Diffuse Porous Wood: Basswood
Diffuse Porous Wood: Boxelder
Diffuse Porous Wood: Big Toothed Aspen
“Other” Features: Elm Bark Cross-Section
Layered Bark of American and Rock Elm
“Other” Features: Long-Grain of Elm
“Other” Features of Oak: Rays
Rays
Versus, No Rays in Ash
Cracks or Checks, but not Rays
“Other” Features: Elm and Hackberry
Both Have Wavy (tiretrack) summerwood
“Other” Features: Elm and Hackberry
Hackberry has Corky Ridges on Bark, no Layered Cross-Section
“Other” Features: Red vs. White Oak
Sodium Nitrite turns White Oak Heart Wood Blue to Purple
“Other” Features: Black Walnut
Medium brown to dark chocolate heartwood.
Let’s Quiz the Log Splitter!
What is It?
0%
0%
0%
0%
0% 1. Hackberry
2. Chokecherry
3. Crabapple
4. River Birch
5. Chokeberry
What is it?
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What is It?
What is it?
0%
0%
0%
0%
0% 1. Birch
2. Cottonwood
3. Big-Toothed Aspen
4. Silver Maple
5. Black Cherry
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What is It?
What is it?
0%
0%
0%
0%
0% 1. Black Walnut
2. Buckthorn
3. Bur Oak
4. Boxelder
5. Ironwood
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What is It?
What is it?
0%
0%
0%
0%
0% 1. White Oak
2. Hickory
3. Hackberry
4. Winged Euonymus
5. Bur Oak
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What is It?
What Is It?
0%
0%
0%
0%
0% 1. Cottonwood
2. Green Ash
3. Hackberry
4. Elm
5. Linden
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What is It?
0%
0%
0%
0%
0% 1. Elm
2. Boxelder
3. Silver Maple
4. Ironwood
5. Linden
What is it?
0 of 180
What is It?
0%
0%
0%
0%
0% 1. Black Pine
2. Black Cherry
3. Austrian Pine
4. Douglas Fir
5. White Cedar
What is it?
0 of 180
What is It?
0%
0%
0%
0%
0% 1. White Cedar
2. Sugar Maple
3. Ponderosa Pine
4. Black Cherry
5. Douglass Fir
What is it?
0 of 180
What is It?
What is it?
0%
0%
0%
0%
0% 1. Linden
2. Sugar Maple
3. Black Ash
4. Elm
5. Green Ash
0
180
Questions… Gary Johnson
UM Urban & Community Forester
University of Minnesota Extension Foresters: Angela Gupta, Rochester Mike Reichenbach, Cloquet Gary Wyatt, Mankato