Why do tree stumps rot in the middle first?

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@NickDay2

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Why do tree stumps rot in the middle first?
« on: 23/05/2011 16:30:05 »
@NickDay2 asked the Naked Scientists:
   
Sawn tree stumps rot in the region near the centre first. Why? All wood was exposed at the same time.

What do you think?
« Last Edit: 23/05/2011 16:30:05 by _system »

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Offline Don_1

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Why do tree stumps rot in the middle first?
« Reply #1 on: 14/06/2011 11:08:37 »
The outer wood is not very nutritious, but the inner wood will still contain water rich in minerals. This makes it by far the best feeding ground for insects and for other plants, such as orchids and fungi.
« Last Edit: 15/06/2011 10:55:18 by Don_1 »
If brains were made of dynamite, I wouldn't have enough to blow my nose.

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Offline imatfaal

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Why do tree stumps rot in the middle first?
« Reply #2 on: 15/06/2011 10:15:57 »
The heartwood in old trees has been dead for a long time.  In very old trees it is not unusual for the centre of the tree to have rotted away whilst the rest of the tree is still healthy.  Not sure I agree with Don - but then he tends to know more about these things than I do.
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Offline Don_1

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Why do tree stumps rot in the middle first?
« Reply #3 on: 15/06/2011 10:54:28 »
I couldn't understand why you disagreed with me imatfaal, so I read my post again and again and all seemed OK until I realised I had put the word 'not' in the opening.

I will correct this and add that the lack of sap (the tree's natural defence against attack as well as its means of transporting nutrients to the canopy) in the inner wood, leaves the centre more porous and open to attack.
If brains were made of dynamite, I wouldn't have enough to blow my nose.

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Offline imatfaal

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Why do tree stumps rot in the middle first?
« Reply #4 on: 15/06/2011 10:57:23 »
 [;D]
Thereís no sense in being precise when you donít even know what youíre talking about.  John Von Neumann

At the surface, we may appear as intellects, helpful people, friendly staff or protectors of the interwebs. Deep down inside, we're all trolls. CaptainPanic @ sf.n