UKTC Archive

Re: Maintain at current size

Subject: Re: Maintain at current size
From: Adam Hollis
Date: May 01 2004 10:36:46

On Tuesday, April 27, 2004, at 10:28 PM, uktc-request@xxxxxx.tree-care.info wrote:

Date: Tue, 27 Apr 2004 13:15:33 +0100
From: "chris.hastie" <Chris.Hastie@xxxxxxxxxx.gov.uk>
Subject: RE: Maintain at current size

On 26 April 2004 21:39, Mark Carter wrote:

Hi Edmund,

Just a general comment that doesn't answer your question I'm afraid!

IMO it is a relatively straightforward exercise to
demonstrate a risk of
subsidence by identifying 3 key elements, tree within Kew
Root data 100%
distance, shrinkable clay soil on site (soil sample or geophys' map),
building foundations not in accordance with current building
regs (NHBC Ch.
4.2).  But to quantify that risk and recommend 'containment' pruning,
that's a different kettle of fish.


Here's a little weekend teaser for you all:

Can anyone please tell me why mature trees (albeit California live oak in america?) can transpire up to 500 gallons a day (a celebrated fact oft cited by detractors of rehydration), when semi-matures of 10cm dbh use only (my own experience) 10 gallons per week of irrigated water in their first growing season?

How do  they make the exponential leap?

Regards

Adam


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