UKTC Archive

Re: Burying

Subject: Re: Burying
From: Andersonarb
Date: Jul 04 2006 07:42:42
In a message dated 04/07/2006 08:02:09 GMT Standard Time, 
Edmund.Hopkins@xxxxxxxxxxxxxxx.gov.uk writes:

"Oy, you don't want to do it like
thaat..."  

I felled a few Ash on a development site up here and was still on site when 
the 360 excavator set about digging up the stumps. It turns out the trees had 
been buried about 10 feet deep with 'clinker' (a sort of expanded aggregate 
that was a by-product of steel making in these parts). The soil level was not 
obviously raised on the site. The trees appeared to have developed quite 
substantial adventitious roots and there was no sign of any degradation of 
the timber 
below the adventitious roots and no signs of any distress beyond what you 
might expect in urban Ash trees.

The clinker stuff is quite light and very porous so I suspect in the short 
term it provided only a little change in water percolation/gaseous exchange 
ability. 

Don't seem to see much 'clinker' around these days.... it used to be bonded 
to make 'breeze blocks' and plenty of woodland footpaths utilised the stuff; 
the paths used to get washed away very easily and block drains as a result.

Sheffield being a hilly city, it is quite common to see trees that were 
'saved' in the 60s by the construction of a retaining wall around 3 sides of 
a tree 
about a foot away from the trunk, where road building and the like demanded 
changes in soil levels. A road near here was a classic example of this, some 
trees there still appear content enough but a lot of them succumbed to DED 
before anything else. Of course I was younger and less aware of crown decline 
symptoms.....

Bill.


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