Whats in Your Woodpile? Gary Johnson Urban and Community Forester University of Minnesota.
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Transcript of Whats in Your Woodpile? Gary Johnson Urban and Community Forester University of Minnesota.
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What’s in Your Woodpile?
Gary Johnson
Urban and Community Forester
University of Minnesota
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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.
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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.
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Softwood versus Hardwood
Softwoods have Tracheids (fibers), No Vessels (pores). Many have Resin Canals.
Resin Canals
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Softwoods versus Hardwoods
Hardwoods have Fibers and Pores
Pores
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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.
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Ring Porous Wood: Black Ash
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Ring Porous Wood: Bur Oak
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Ring Porous Wood: American Elm
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Semi Ring Porous: Black Walnut
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Ring Porous versus Diffuse Porous Pores about same size and distributed
evenly throughout growth ring = Diffuse Porous.
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Diffuse Porous Wood: Basswood
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Diffuse Porous Wood: Boxelder
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Diffuse Porous Wood: Big Toothed Aspen
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“Other” Features: Elm Bark Cross-Section
Layered Bark of American and Rock Elm
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“Other” Features: Long-Grain of Elm
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“Other” Features of Oak: Rays
Rays
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Versus, No Rays in Ash
Cracks or Checks, but not Rays
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“Other” Features: Elm and Hackberry
Both Have Wavy (tiretrack) summerwood
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“Other” Features: Elm and Hackberry
Hackberry has Corky Ridges on Bark, no Layered Cross-Section
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“Other” Features: Red vs. White Oak
Sodium Nitrite turns White Oak Heart Wood Blue to Purple
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“Other” Features: Black Walnut
Medium brown to dark chocolate heartwood.
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Let’s Quiz the Log Splitter!
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What is It?
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0%
100%
0%
0%
0% 1. Hackberry
2. Chokecherry
3. Crabapple
4. River Birch
5. Chokeberry
What is it?
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What is It?
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What is it?
0%
0%
78%
22%
0% 1. Birch
2. Cottonwood
3. Big-Toothed Aspen
4. Silver Maple
5. Black Cherry
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What is It?
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What is it?
0%
22%
33%
44%
0% 1. Black Walnut
2. Buckthorn
3. Bur Oak
4. Boxelder
5. Ironwood
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What is It?
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What is it?
33%
44%
22%
0%
0% 1. White Oak
2. Hickory
3. Hackberry
4. Winged Euonymus
5. Bur Oak
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What is It?
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What Is It?
0%
11%
0%
22%
67% 1. Cottonwood
2. Green Ash
3. Hackberry
4. Elm
5. Linden
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What is It?
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11%
67%
0%
22%
0% 1. Elm
2. Boxelder
3. Silver Maple
4. Ironwood
5. Linden
What is it?
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What is It?
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11%
33%
0%
56%
0% 1. Black Pine
2. Black Cherry
3. Austrian Pine
4. Douglas Fir
5. White Cedar
What is it?
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What is It?
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11%
0%
11%
22%
56% 1. White Cedar
2. Sugar Maple
3. Ponderosa Pine
4. Black Cherry
5. Douglass Fir
What is it?
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What is It?
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What is it?
78%
0%
11%
11%
0% 1. Linden
2. Sugar Maple
3. Black Ash
4. Elm
5. Green Ash
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Questions… Gary Johnson
UM Urban & Community Forester
University of Minnesota Extension Foresters: Angela Gupta, Rochester Mike Reichenbach, Cloquet Gary Wyatt, Mankato