UKTC Archive

Re: Tree Root Literature

Subject: Re: Tree Root Literature
From: Michael Richardson
Date: Nov 05 2019 09:37:57
So if there are no simple rules to apply, what the complex rules?  What are
the factors that need to be examined to determine size of intact root plate
necessary to keep the tree from tipping?  Is there a protocol to follow or
are consultants just supposed to use their knowledge and a feeling to
decide whether to retain or remove?

I am finding that the apparent genetically controlled root plate
architecture is overly simplistic and does not account for variations in
soil and water regime and drainage of soils.  On a large project I am
finding Norway spruce with tap roots on table lands where soils have a
large sand component and are well drained.  Half a mile away on the slope
to the river the sand component remains but the drainage ranges from
imperfect to surface water lower on lower slopes.

In this example saying the tree has a specific architecture or sinker roots
or application of a simple ratio (i.e. 10 m per 1m DBH) does not work.
Mattheck's formulas provide some help but I think rooting depth, controlled
by water and lack of oxygen, is the wrench in the formula.

So what is protocol that is developed and defensible for assessing these
trees?

Michael


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 Tue, Nov 5, 2019 at 4:22 AM Jerry Ross <trees@xxxxxxxxxx.co.uk> wrote:

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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