UKTC Archive

Re: the plasticity of oak trees

Subject: Re: the plasticity of oak trees
From: Bill Anderson
Date: Jun 28 2020 17:57:42
Nice pictures Rupert. I've seen similar trees on the edge of a quarry,
where the spalling has left the trees similarly suspended. There's also an
Oak in North Sheffield that I once found where the stream had effectively
left the tree growing on stilts. You'd think the saltwater would do for
these wouldn't you?
Bill.

On Sun, 28 Jun 2020 at 18:14, Rupert Baker <rupert_baker@xxxxxxxx.co.uk>
wrote:

Hi John, Ian,
It is on the tidal Dart estuary in S Devon; where I grew up - lucky me!
(though I couldn’t afford to live there myself now).
When I have been down on the Helford woods, either for the launch of Olly
Rackham's posthumously published book, or at other times on hols, I haven’t
seen any like the ones photo'd; which may be down to the differing geology.
The rocks  that part of the Dart are hard- Ashprington Volcanics and
associated sedimentary rocks, which have been metamorphosed; the rocks
cleave along natural bedding planes, which may allow a slow rate of
erosion. - the bedrock the Helford runs through is Middle Devonian
shillets/mudstones, so quite a lot softer; though I see the bedrock at
Hayling etc is Chalk!
One curious thing I have noticed over the years is that, at least in
summer, the salinity in the estuary tends to be higher than in the sea -
presumably because river flows of fresh water are low, and there is
evaporation from the extensive mud-flats at low tide. The foliage of the
oaks (and other trees) gets a clear 'browse-line' from the salt at high
tide, but some of the more slumped trees have their bases inundated at high
tides, several days either side of full spring tides, so maybe 24+ times a
month. They don’t seem to take much harm from it; and where trees fall onto
the foreshore, and remain alive with roots back into the bank, you have the
odd site of live, foliaged oak branches growing out of salt water at high
tide
Atb
Rupert

-----Original Message-----
From: uktc-request@xxxxxx.tree-care.info On Behalf Of Brewster, Ian
Sent: 28 June 2020 12:17
To: UK Tree Care <uktc@xxxxxx.tree-care.info>
Subject: RE: the plasticity of oak trees

Hi Rupert, excellent post. We have similar around Hayling, Bosham and
Chidham. Possible remnants of ancient boundaries. Is the estuary
salt/intertidal?


Sent from my Samsung Galaxy smartphone.
Hi Rupert, excellent post. We have similar around Hayling, Bosham and
Chidham. Possible remnants of ancient boundaries. Is the estuary
salt/intertidal?


Sent from my Samsung Galaxy smartphone.



-------- Original message --------
From: Rupert Baker <rupert_baker@xxxxxxxx.co.uk>
Date: 28/06/2020 12:01 (GMT+00:00)
To: UK Tree Care <uktc@xxxxxx.tree-care.info>
Subject: the plasticity of oak trees

Dear All,

I was intrigued by a series of oak trees growing along the edge of a tidal
estuary. I have known these trees since I was a child, but never really
thought about what I was looking at. However, looking at them through an
arborists eyes, they are very strange indeed; they have slumped under their
wight/gravitational load, as the bank has been eroded beneath them, and
changed shape; the oldest now have their bases some 3m below the original
level; the trees' buttresses and root systems changing shape under load,
whilst keeping the trees upright.

I'm hoping that this time you will be able to view the photos in this
flickr album I've set up for the purpose; the photos are described 1,2 etc
with brief descriptions.

See link below.

Trees are a constant surprise!

Atb

Rupert



https://www.flickr.com/gp/189086679@N02/40109G<
https://www.flickr.com/gp/189086679@N02/40109G>




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https://www.stockholmtreepits.co.uk>
NPS
 -------- Original message --------
From: Rupert Baker <rupert_baker@xxxxxxxx.co.uk>
Date: 28/06/2020 12:01 (GMT+00:00)
To: UK Tree Care <uktc@xxxxxx.tree-care.info>
Subject: the plasticity of oak trees

Dear All,

I was intrigued by a series of oak trees growing along the edge of a tidal
estuary. I have known these trees since I was a child, but never really
thought about what I was looking at. However, looking at them through an
arborists eyes, they are very strange indeed; they have slumped under their
wight/gravitational load, as the bank has been eroded beneath them, and
changed shape; the oldest now have their bases some 3m below the original
level; the trees' buttresses and root systems changing shape under load,
whilst keeping the trees upright.

I'm hoping that this time you will be able to view the photos in this
flickr album I've set up for the purpose; the photos are described 1,2 etc
with brief descriptions.

See link below.

Trees are a constant surprise!

Atb

Rupert



https://www.flickr.com/gp/189086679@N02/40109G<
https://www.flickr.com/gp/189086679@N02/40109G>




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The UK Tree Care mailing list
To unsubscribe send mailto:uktc-unsubscribe@xxxxxx.tree-care.info

The UKTC forum is supported by Bosky Trees arboricultural consultancy and
Stockholm Tree Pits https://www.stockholmtreepits.co.uk<
https://www.stockholmtreepits.co.uk>



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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 https://www.stockholmtreepits.co.uk




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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
https://www.stockholmtreepits.co.uk




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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
https://www.stockholmtreepits.co.uk