UKTC Archive

RE: Tree Root Literature

Subject: RE: Tree Root Literature
From: Rupert Baker
Date: Nov 05 2019 10:00:54
Hi Jerry,
I see what you are saying;  but it is more than just the main woody roots; it 
is the matrix of soil and roots - forming a composite like GRP with the soil 
as the plastic and the roots as the glassfibre. My understanding from talking 
to Claus about this a few years back is that rootplate failure tends to take 
place at the (somewhat variable) radius outside the stem where the root taper 
tends to zero and the roots continue on with a cylindrical section.  He said 
that this zone is where rootplates tend to fail along. So more or less by 
definition it is a characteristic of failure.
Atb
Rupert


-----Original Message-----
From: uktc-request@xxxxxx.tree-care.info On Behalf Of Jerry Ross
Sent: 05 November 2019 09:22
To: UK Tree Care <uktc@xxxxxx.tree-care.info>
Subject: Re: Tree Root Literature

It's all very well (or not) saying what size rootplate makes a tree stable, 
but what exactly IS a rootplate?
It seems to me that essentially it comprises the woody roots that remain 
attached to the tree when it uproots - in other words, it's largely an 
artefact of failure.
As such it's dependant on a host of factors, not only root morphology and 
their physical characteristics (which themselves are likely to vary widely 
with species) but also soil conditions, underground constraints that may 
affect root development, soil type (sandy, clayey, dry,
waterlogged) let alone disease, decay and of course climate and weather.
As Philip suggests, there are simply too many variable to allow simple rules 
to be applied with any confidence.




On 04/11/2019 18:11, Philip van Wassenaer wrote:
Every tree is different. This is very hard to standardize with so many 
variables with every tree you might look at.


Philip van Wassenaer, B.SC., MFC
Principal Consultant
Urban Forest Innovations Inc.
Mississauga, Ontario, Canada
www.urbanforestinnovations.com



-----Original Message-----
From: uktc-request@xxxxxx.tree-care.info 
[mailto:uktc-request@xxxxxx.tree-care.info] On Behalf Of Michael 
Richardson
Sent: November-04-19 12:49 PM
To: UK Tree Care
Subject: Re: Tree Root Literature

All good choices.  I have gathered enough info for a basis of 
understanding but now the issue is how does the soil, and specifically 
the depth of rooting affect the stability of trees.

Mattheck and others have done some calculations with regards to 
counter-weighting the sail.

I am now looking for a standardized protocol for assessing minimum 
root plate required to maintain stability of the tree, both under 
static and dynamic load.  I am particularly interested if there is a 
protocol that discusses how soils and water should be evaluated and 
what part they play in stability.

Michael Richardson B.Sc.F., BCMA
Ontario MTCU Qualified Arborist
Richardson Tree Care
Richardsontreecare.ca
613-475-2877
800-769-9183

   <http://www.richardsontreecare.ca/images/Tree_Doc_logo_email.png>



On Mon, Nov 4, 2019 at 12:36 PM Mark Mackworth-Praed < 
uktc@xxxxxx.tree-care.info> wrote:

Hi Michael & Bill

The Mattheck/Breloer 'formula' for structural root plate radius 
is/was
3.5-4.0 times trunk diameter - if I remember rightly, their argument 
was that the fatter the tree, the more it relies on the dead weight 
of its own trunk to support it, but I've always assumed the 4 X 
diameter, in order to be on the safe side. The other paper that might 
be worth looking at is Gasson and Cutler 'Tree Root Plate 
Morphology', Arboricultural Journal 1990, Vol 14 No. 3, pp 193-264, 
which analysed results from the Kew tree root survey following the 
October 1987 storm in SE England. The tree species & soil types they 
looked at might not be applicable/transferable to the case you're 
looking at though, I guess, but it might be some help nonetheless.

Kind regards
Mark M-P

-----Original Message-----
From: uktc-request@xxxxxx.tree-care.info 
<uktc-request@xxxxxx.tree-care.info>
On Behalf Of Bill Kowalczyk
Sent: 04 November 2019 13:31
To: UK Tree Care <uktc@xxxxxx.tree-care.info>
Subject: Re: Tree Root Literature

Hi Michael

I remember (not so much these days!) about 20 years, or so, ago Claus 
Mattheck came up with calculation for minimum rootplate diameter in 
relation to stem size to maintain the structural integrity with 
regards to wind-throw.

I don’t have my books to hand, but it might be a pointer in the right 
direction…

Regards,

Bill

On 3 Nov 2019, at 12:41, Michael Richardson <
richardsontreecare@xxxxxx.com> wrote:


3) method of *visual* inspection to determine the size of root plate 
necessary to remain stable under wind loads




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