UKTC Archive

RE: Roots crossing river/water-course boundaries

Subject: RE: Roots crossing river/water-course boundaries
From: Rupert Baker
Date: Feb 22 2021 13:29:50
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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