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Old Oct7-05, 03:14 PM                  #1
JWest

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Why don't untapped maple trees explode?

In my food and culture/biology class, our teacher played an audio file about untapped maple trees exploding, but after it was over, she told us it was an April Fool's prank. However, I am curious to know. Why don't untapped maple trees explode?
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Old Oct7-05, 05:04 PM                  #2
Moonbear
 
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What would your reasoning be why they should? Otherwise I don't even know where to begin to answer this question.
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Old Oct7-05, 06:24 PM                  #3
pattylou

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LOL...

I think tapping a maple tree is sorta like drawing blood from a person.

I give blood regularly, but my husband doesn't, and so far he hasn't exploded.
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Old Oct7-05, 06:30 PM                  #4
sssddd

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is this even the right place ask this kind of question.
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Old Oct7-05, 06:36 PM                  #5
pattylou

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Yes. Plants have biology too.
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Old Oct7-05, 06:41 PM                  #6
arildno

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Originally Posted by JWest
In my food and culture/biology class, our teacher played an audio file about untapped maple trees exploding, but after it was over, she told us it was an April Fool's prank. However, I am curious to know. Why don't untapped maple trees explode?
I suggest you read Brian Aldiss' brilliant Helliconia trilogy.
You'll be in for a real treat..
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Old Oct7-05, 07:39 PM       Last edited by Ouabache; Oct7-05 at 11:41 PM..            #7
Ouabache

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Why don't untapped maple trees explode?
An inquisitive mind is a good thing. That is an important quality to study science. I've been asked a similar question about mosquitos. If you let one bite your arm and they take a drink, if you tighten your arm and increase the pressure in your blood vessels, will the mosquito explode?

Let's tackle your question.. It seems you are wondering about the pressure of the maple sap that flows in the springtime. The sap flows in the xylem (also called sapwood) and in early spring, it is due to root pressure. Because there are more solutes inside the roots compared with outside the roots, by osmosis water external to the roots, will be drawn in and rise up through the xylem. Later in the season, the leaves unfurl and transpiration (vapor transfer via the stomata) cause a negative pressure in the xylem and draws the sap up into the tree. Angiosperms (of which maple is a member) appeared on earth about 100 million years ago ref. They have evolved this nice method of drawing nutrients up into the tree where they are needed. To my knowledge, none have been observed to explode from the pressure of the sap. The reason is that the pressure is too low compared with the restraining forces of the vessel (wood in the tree).

Root pressure in trees can range from 0.1 to 0.6 MPa ref (0.1MPa = 1 atmosphere pressure, or the amount of pressure our own atmosphere exerts at sea level).
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Old Oct7-05, 08:01 PM       Last edited by pattylou; Oct7-05 at 08:03 PM..            #8
pattylou

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Originally Posted by Ouabache
An inquisitive mind is a good thing. That is an important quality to study science. I've been asked a similar question about mosquitos. If you let one bite your arm and they take a drink, if you tighten your arm and increase the pressure in your blood vessels, will the mosquito explode?

Let's tackle your question.. It seems you are wondering about the pressure of the maple sap that flows in the springtime. The sap flows in the xylem (also called sapwood) and in early spring, it is due to root pressure. Because there are more solutes inside the roots compared with outside the roots, by osmosis water external to the roots, will be drawn in and rise up through the xylem. Later in the season, the leaves unfurl and transpiration (vapor transfer via the stomata) cause a negative pressure in the xylem and draws the sap up into the tree. Angiosperms (of which maple is a member) appeared on earth about 100 million years ago ref. They have evolved this nice method of drawing nutrients up into the tree where they are needed. To my knowledge, none have been observed to explode from the pressure of the sap. The reason is that the pressure is too low compared with the restraining forces of the vessel (wood in the tree).
Great, except that you collect sap (maple water) in the fall ...

Practically, you should not tap a tree smaller than a particular size, and not more than with one sugar-water spigot....

How would any of the above change the answer, if at all?
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Old Oct7-05, 08:13 PM       Last edited by Ouabache; Oct7-05 at 08:31 PM..            #9
Ouabache

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Originally Posted by pattylou
Great, except that you collect sap (maple water) in the fall ...
Hmmmmm

I've only seen taps on the sugar maple trees in early spring when the nights are cold and days are warm. Shortly thereafter, you can visit the sugar camps and watch them simmer the sap into syrup.

(Sidenote: you can tap any maple tree to make syrup, but the sugar maple's (Acer saccharum) sap, has the highest concentration of sugar (~ 2%)

You are right, small trees should not be tapped. Typically trees are tapped when their trunk diameter is minimum of 10 inches measured four feet above the ground ref
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Old Oct7-05, 08:17 PM                  #10
pattylou

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Maybe my mom taught me wrong? She grew up in Australia, she may have had it backwards....
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Old Oct7-05, 08:20 PM                  #11
pattylou

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Google has me wrong and you right. I stand corrected.

I wonder if we killed a few trees in ignorance.... I know we successfully tapped a few trees in the woods in the fall, but didn't pay attention to whether they grew well the next year.

thanks Oubache!
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Old Oct7-05, 08:51 PM       Last edited by Ouabache; Oct7-05 at 09:57 PM..            #12
Ouabache

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That's okay, as a Boilermaker you're talented with a creative thought process
Let's hear more about the maple syrup
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Old Oct8-05, 11:57 AM                  #13
Lapin Dormant

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Hey hows about tapping those Golden Birches in the spring too, hear that they can make pretty good sap-syrup as well, run well too. (juicy)
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Old Oct18-05, 02:51 AM                  #14
Ouabache

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Golden Birches? Are you referring to Betula ermanii? According to this source, gold birch doesn't have any edible uses.
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