Tree Root Power??? -- GEOFORUM

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Date Posted: 08:11:22 08/04/99 Wed
Author: NSW Long (Sylvester Cat)
Subject: Tree Root Power???

I quote from the notes which we received today which are based on Dr Chatterjea's transparencies. "FELLING OF TREES -> rotten roots decreases (c) cohesive strength, removal of trees reduce normal stress (load)." That point was presumably raised to aid in understanding slackening of soil particle cohesiveness. However, from what I have heard from Dr Chatterjea today and now from reading her notes, discrepancies surface, apparently.

My understanding is that tree roots (living) have some kind of holding power on the soil such that the tree roots prevent the soil from becoming less cohesive, unconsolidated. In this respect, my understanding needs to be reinforced from readers and from Dr Chatterjea as to how the roots have such special holding power. Therefore, it makes sense to me, at least at this stage that dead roots from felled trees can no longer hold the soil together and so the soil becomes unconsolidated.

So, how is it that the point of "removal of trees reduce normal stress (load) comes in?" The question is which of the component actually reduces soil consolidation (1) or (2) or (3), which is both? Point(1) being the removal of trees which leads to reduction of surface stress leading to soil becoming loose and that results in unconsolidation of soil and therefore is a prime candidate for water action to act as a trigger for gravity to lead to landslides. Point(2) being the loss of tree roots as the factor in soil unconsolidation. How exactly, I still do not know. Point (3) being both points working in synthesis to result in soil unconsolidation.

Any answers for this little small query???

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Replies:

Re: Tree Root Power??? -- Dr. Chatterjea, 20:02:57 08/05/99 Thu
- Re: Tree Root Power??? -- Sylvestercat, 22:09:35 08/05/99 Thu