C o d i t

[bythamboy]

doing course work , CODIT in relation to tree wounds , need at least two examples of trees that are good at compartmentalisation and others that are bad at compartmentalisation, any one know or point me in the right direction ?

[RDB logs]

oak, walnut, elm, maple, ceder, are all good

fig, poplar, elder, willow, box, are examples of bad

Dr Shigo did alot of work on this, and some of the cut away photos on the internet are really interesting and are good examples of his work.

hope this helps

[bythamboy]

thanks for your reply , trying to sort it all now ready for tomorrow .

[Rick2517]

I take it your doing the level 4 with tree life then?

Im on the course at westinburt and I also struggled with that one, I found the trees but hcouldn't get the info on reasons why they are better or worse!! Any ideas?

I think I put it down to something to do with wall 1 blocking xzylem and phloem!!

[Mr Fir]

It's to do with the trees growth rate. Faster grown = less resistance to decay generally. Some trees like oak have heartwood where the cells are 'dead', blocked up with tanin and other chemicals.

 

Species like Poplar won't invest energy in wall 4 or even reaction zones, it tries to outgrow the decay by keeping the soundwood/ decayed wood ratio high...and usually fails!

 

Also depends on the pathogen and species interaction.

 

Some good reading @ http://www.treedictionary.com/DICT2003/shigo/index.html

Trees: their natural history by Peter Thomas is on the money for tree anantomy.

[bythamboy]

yes level 4 at syston I put down that oak and walnut are good re codit due to having high levels of tannins and sugar maple also good as big sap producer. poor codit examples poplar and willow but not sure why fast growing / piffy wood ?