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Girdling/Ring-barking to improve wood quality  RSS feed

 
Patrick Barmet
Posts: 4
Location: Switzerland
fungi trees woodworking
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Hi everyone

I made  a intresting opservation on a girdeled walnut

use Girdling/Ring-barking  to improve proportions of heartwood.
i made a intresting opservation on a girdeled  walnut. below the girdeling cut the proportions of the heartwood was a lot biger then above of the cut. the walenut was about 20cm in diameter and 15 years oald, so you wold not expect any heartwood. Ore only first sines of it. This was the case about the cut, but below 2/3 uf the diameter wher turned in to heartwood. when i split the trunk you could see an abrupt cange in color on the level of the cut.

now to use this phenomenon to ouer advantage  we have to modify it a little. the girdeling  would have to be below the first big  branches. So the main trunk does not get any asimilates from about. this will starve the long living cells (parenchyma) in the sapwood and forse them to initiate  the process which turns them in to heartwood. like it happens usualy with aging of the sapwood.  the pores cloas and camicals are acumulate in the cells which gifs the heartwood it's durability and the nice dark color. but the cut below the crown is not enougth.
if you do this some of the tree spicies probably reakt with heavy production of trunk shoots/water sprouts.
to prevent  this you need to do a secound cut on ground level. This s becouse, with the first cut you not only suppress the transport of assimilates from leaf to root. you also stopt the flow of auxin. Auxin is a plant hormon prodused in the top of young shoots which ceps  secundary buts dormant. (auxin also improves root groth and is the Active substance in willow water. This is why i think it is more  efficient to just use the top of young willo shoots. ) with the cut on ground level you stop the suplay of cytokinine a other hormon, produced in the roots.  Cytokenine forces buts to sprout, if ther is not enougth auxin  to suppress it. the process takes probably about 2 to 3 years.
I will try this on a large brunch of a oak next to my home. if anyone  girdel trees mabe you cane chack for this observation. one some trees it's mabe bether to do girdel in two steps. like blacke lackust. in the first year you only cut 4/5 of the bark and the rest in the second year, otherwise the tree will die to fast. And just resprout from roots. it is also importend to leave the sapwood undamaged. otherwice the tree will just dry out. With out the building  of heartwood.

A similar  technique was applied  on some pine trees, to improfe wood quality and Resin content. the spicies i heard this was picea abies. In the case of pine trees girdeling is propably a bad idee. It will end with the spoiling of the wood and atraction of bark beeatels . so what they did, back in the day, was remov the bark of the tree. And let it stay for a other two years, till it drops the nedels and is dry
The sapwood will turn into a glass like structure with a hige content of rosin.
A frind of me tried this and told me about.
And i will this try to. But it would be great to have a proper  sorce about this. Eiter a History raport or a study.

Best regards from switzerland
Patrick Barmet

PS: I apologize for my spelling but dyslexia makes writing in a foreign language not just easier.
Feel free to edit my text and corect my spelling

 
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