UKTC Archive

Re: Roots crossing river/water-course boundaries

Subject: Re: Roots crossing river/water-course boundaries
From: Wayne Tyson
Date: Feb 22 2021 21:31:45
All good answers. Briefly and redundantly, *context* is everything!

I believe there must be some work in the plant physiology literature, maybe
even a textbook, but what little memory I have left, says, as others have,
that oxygen is the limiting factor, whether it is present in the water or
soil, the the species' ability to translocate sufficient oxygen to maintain
healthy vasculature. One can, however, "drown" almost anything--back to
specific context.

WT

On Mon, Feb 22, 2021 at 8:37 AM oldoaktree@xxxxxxxxx.net <
uktc@xxxxxx.tree-care.info> wrote:

Surely it also very much depends upon the soil and species involved too?

When I am drawing RPAs I will usually consider considerable watercourses
to be a fairly good rooting barrier and not include them as part of the RPA
s they are not going to find much useful rooting area there, so I deflect
the RPA to compensate.

However, for riparian species alder, willow and downy birch for example, I
don’t tend to, as they are specialists in growing in very wet soil and a
reasonable argument could be made that the riverbed is a good rooting area
for such specialists as long as oxygen is available to roots in the
bankside part of the RPA.

No science there though!

Cheers

Dave

-----Original Message-----
From: uktc-request@xxxxxx.tree-care.info 
<uktc-request@xxxxxx.tree-care.info>
On Behalf Of Bill Anderson
Sent: 22 February 2021 16:14
To: UK Tree Care <uktc@xxxxxx.tree-care.info>
Subject: Re: Roots crossing river/water-course boundaries

Rodney Helliwell remarked in an article some years ago, that streams or
water courses may act as a root barrier Brynley, but I think it's fair to
say that it all depends on the water course. It's hard to imagine roots
stretching or growing to the other side of (say) the River Don in
Sheffield, but in Jerry's implied scenario, where a stream may have dried
out long enough for roots to have got a toehold on the opposite bank before
then becoming waterlogged again, then a root acting as a conduit (crossing
beneath the streambed) for resources garnered by fine roots some distance
away in un-waterlogged soils sounds perfectly feasible. Doesn't it?
Bill.


On Mon, 22 Feb 2021 at 15:27, Michael Richardson <
richardsontreecare@xxxxxx.com> wrote:

Or this one:
https://www.woodlandtrust.org.uk/media/1761/keeping-rivers-cool.pdf

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, Feb 22, 2021 at 10:26 AM Michael Richardson <
richardsontreecare@xxxxxx.com> wrote:

Perhaps this article may have some references that are useful to you.



https://www.researchgate.net/publication/229468709_The_Distribution_an
d_Strength_of_Riparian_Tree_Roots_in_Relation_to_Riverbank_Reinforceme
nt


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, Feb 22, 2021 at 10:16 AM Brynley Andrews <
brynley.andrews@xxxxxx.com> wrote:

Hi Rupert
That’s great thanks. There’s No hard science on the subject so it
seems.
Thanks
Bryn

On Mon, 22 Feb 2021 at 13:29, Rupert Baker
<rupert_baker@xxxxxxxx.co.uk>
wrote:

Hi Brynley,
I recall Jeremy Barrell stating at a workshop (down in Cornwall
couple
of
yrs ago IIRC) that tree roots didn’t cross watercourses/drainage
ditches.
I do not know on what authority he said this.  I have no
experimental evidence, but would think that both species you
mention have the
potential
to do so. I had a large mature Ash in my care years ago which
grew
with
a
stream flowing either side of it - implying that its roots had
bridged across/underneath, since stability would otherwise have
been an issue.
As
well as any impetus to grow out as anchors (and I do not know how
this
is
'controlled' by a tree's internal systems)  It'll all be about
the
levels
of oxygenation of the water - as Wyne says - and perhaps whether,
having
reached a supply of water, there is any impetus for roots to
travel further, if you see what I mean - it is common to see
Alder & Willow
roots
exploiting water in stream edges.

Not a lot of use, but you could try asking Jeremy.

Atb
Rupert

-----Original Message-----
From: uktc-request@xxxxxx.tree-care.info On Behalf Of Brynley
Andrews
Sent: 22 February 2021 09:21
To: UK Tree Care <uktc@xxxxxx.tree-care.info>
Subject: Roots crossing river/water-course boundaries

Good morning all

Just been considering the likely rooting radial extent of some
mature trees on the other side of (but against) a water course
boundary
(stream)
about 1-2m wide. I do not recall reading any guidance on this and
it
seems
most of the science relates to soil erosion and riparian habitats.

Anyone know of some quality guidance on the likely rooting extent
across/under watercourses.

Thanks

Bryn

--
Brynley M M Andrews MSc., C.Env., M.Arbor.A.
www.brynleyandrewsassociates.com
01935 XXXXXX
07970 XXXXXX



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To unsubscribe send mailto:uktc-unsubscribe@xxxxxx.tree-care.info

The UKTC forum is supported by Bosky Trees arboricultural consultancy and
Stockholm Tree Pits
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