My bag Guy...
It wasn't a dozer... IT WAS AN EXCAVATOR............
removing "AT LEAST TWO FEET OF EARTH"
SOOOOOOOOOOOO.... how many feet do we have to get to before scraping turns into trenching?????????????
I grind stumps for a living and can promise you.... THERE ARE NO WOODY ROOTS DOWN PAST TWO FEET ( on that maple)....
I read pg 182-186 of "abiotic disorders" and it mentions nothing of a difference between trenching and scraping...... also I assume you are talking about "modern arboriculture" when you refer to shigo... My copy is MIA right now...
That said here is a quote from Gilman's website as per earlier link:
"Even cutting small (less than one-half inch) roots under or outside the edge of the canopy for long stretches can cut off water supply to the tree. This can cause the tree to decline or die during the next several years."
Now we've heard that there were many roots torn up that were over an inch and some as big as a his wrist... I would guess that is 2-2.5".... SO do we really need pics to say without question that there is no fixing that kind of damage. I DON'T... and from the pics it is clear that EXCAVATOR was right up on the base of that tree completely removing 30% or more of the woody roots of that tree....
AND furthermore it is clear that the tree is right next to this man's house, and will do significant damage should it end up falling on the house...
Guy I have to say... you're either not reading carefully or I AM feeling some worry for you.... Have you ever had a tree that you recommended a customer keep go down and do significant damage? That is a bad feeling... I've been there.
I regularly talk customers out of removing good trees... I've saved countless trees that way over the years and its a good feeling... That said... when I think a tree is dangerous... I AM a man on mission... with a CHAINSAW....
This tree is structuraly compromised and it will fail without question no matter what... The only question is WHEN?
SO that gets us back to the human variable... If you or me owned the tree we could cut it anytime ion the next 5-10 years and it would be fine to leave it for a while... BUT with this goofy neighbor, LX is better getting it down sooner than later..
Or maybe he should just move... Still what is the "right" thing to do... That tree has to go!
oh and another quick point... "Abiotic disorders" mentions that trees with thin bark are worse off than trees with thick bark, when it comes to root damage..
I'd put the maple in the former category
So the neighbor & family use the excavator to grade the yard...severely grade the yard undermining the tree(s) between his property & mine thus removing aleast 2ft of earth & severing the majority of the root system, ....