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devon TWiG

Theories / explanation

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https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4228119/

 

Third paragraph in the Introduction and third paragraph in the Discussion.

 

Root grafting appears to be important not so much for energy but for auxin triggers for callus development. Douglas Fir seems to be the ideal species for studying this phenomenon of 'stump overgrowth'.

 

It may not just be a quirk of nature. In evolutionary terms, for a species with a tendency to root grafting the ability to close off even stumps could prevent the colonisation of whole stands by pathogens. Just my amateur theory.

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So in a way the neighbouring tree ( still alive and standing ) due to being "attached " to the stump by the root grafts , feels that it is defending its self ,as though it has been wounded because theoretically pathogens have a route in to the tree .... this I guess is why the stumps were always treated with urea ( from what I gather is no longer done ) ... I just found it interesting and hoped to know a bit more ..... I do now !

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Eh, no not really.Trees don't have feelings, they just have automatic reactions to situations, pre-programmed genetically by millions or hundreds of millions of years of evolution snf communiocated chemically through vascular systems. That which worked was passed on, failures leave no offspring.

 

I have forgotten why urea is applied to stumps, but I will remind myself shortly.

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