UKTC Archive

Re: Estimating tree ages based on trunk diameter/girth

Subject: Re: Estimating tree ages based on trunk diameter/girth
From: Bill Anderson
Date: Jan 12 2022 10:01:36
While I can see that the age of a tree may be pertinent in a dispute about
a TPO, what relevance does age have to a review of TPOs? What the
TPO-server thought (say) 50 years ago doesn't have much relevance to a TPO
application in 2022. Unless it does of course.

On Wed, 12 Jan 2022 at 09:27, Jerry Ross <trees@xxxxxxxxxx.co.uk> wrote:

Hi Paul. You've presumably ( not sure why I presume, but anyway) know this
site:
https://bristoltrees.space/trees/age-estimation.xq?species=Common+Lime&girth=&dbh=131.5
 It's
just John White's system, but made super-easy to use. He describes it, of
course, as being for 'large and veteran trees', but I'd say it's reasonably
accurate for most mature trees (past their youthful high-vigour stage) .
But it does sometimes give anomalous results. I queried the ages produced
for some large (non - veteran) European (common) limes, which came out
younger than I thought was likely. He told me that the statistics used for
limes were from a particular stand of Large-leaved limes... Which didn't
seem to apply to the Common limes I was looking at. The problem is that
there are too many variables (and FAR too many old area TPOs!) Jerry Ross -
from my mobile
-------- Original message --------From: Paul Barton <
paul@xxxxxxxxxxxxx.co.uk> Date: 12/01/2022  08:55  (GMT+00:00) To: UK Tree
Care <uktc@xxxxxx.tree-care.info> Subject: Estimating tree ages based on
trunk diameter/girth Dear collective,I wonder if you can help me?  I am
looking for a simple method to estimate tree ages as part of a preliminary
review of some area TPOs - i.e. to assess whether trees that are present
now were most likely present (or not) on the year the area TPO was served.I
have come across various apps that claim to give an age based on trunk
girth but after a brief test they seem to overestimate age (based on my
experience only) as I suspect they are based on forestry plantation trees
which tend to be more slender over time than open grown trees.I came across
this document from Newport council (
https://www.newport.gov.uk/documents/Leisure-and-Tourism/Countryside/Measuring-Trees.pdf)
 which
suggests that tree growth rates could be split out in to slow, moderate and
fast - each with a corresponding ‘average’ annual girth increase.  These
are given as:• Slow - 1.88 cm per year• Average - 2.5 cm per year• Fast -
3.13 cm per yearUsing such values would allow me to classify species by
growth rate category and therefore have a ready reckoner to estimate tree
ages based on their girth.  It can never be claimed to be very accurate but
for the purpose of quickly assessing hundreds of trees a repeatable
documented method would be useful.BUT I don’t know if the above growth rate
values are based on good data, ideally in the UK.Finally to the point
(congratulations if you lasted this long)…can anyone point me to a reliable
source of UK tree growth rate data so that I could verify or amend the
above suggested rates of growth?Kind regards,Paul
Bartonwww.barton-hyett.co.uk | Barton Hyett Associates Ltd |
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The UKTC forum is supported by Bosky Trees arboricultural consultancy and
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