Water Release from sloughed off tree roots due to cut tops?

I recall being taught *somewhere* that when a tree is cut while it's not dormant, it kills off much of its roots and in so doing releases the water contained in those roots. Enough that cutting down a stand of poplars will often make ground boggy for a few days regardless whether or not there's been rain for the past few weeks.

But when I try to confirm these memories via google, my search-fu is failing hard.

Can anybody confirm whether or not this is true [and if it is true, can you provide links supporting it?]

I've gotta go to work, so I don't have time to look for it now. But on youtube there is a video of a group of tree fellers getting a large oak off the top of house. As they're removing top growth to lighten the tree enough to use a crane, water starts pouring out of the trunk of the tree. Freaked the newer tree trimmers out, but think it supports your theory.

Shortly after the 18 minute mark in this videa

Wild!

I thought it might be a hollow tree filled with rainwater (we call those "Magic Trees" on our place because frogs and other critters live in them), but I guess not!