Subject: Re: Quercus cerris x Q. robur
To: uktc@xxxxxx.tree-care.info
From: luketreescapes@xxxxxxxxxxx.com
Date: Thu, 17 May 2012 20:23:43 +0000
Tony,
That's the Baltic States, we have the Gulf Stream here. I'd expect our oaks
to grow quicker than yours. However most don't grow as fast as that one.
Regards
Luke Steer
Chartered Arboriculturist
Treescapes Consultancy Ltd.
Tel: 015394 34698
Mobile: 07734 113964
www.treescapesconsultancy.co.uk
-----Original Message-----
From: antony croft <hamadryad@xxxxxxxx.co.uk>
Date: Thu, 17 May 2012 21:14:12
To: UK Tree Care<uktc@xxxxxx.tree-care.info>
Reply-To: uktc@xxxxxx.tree-care.info
Subject: RE: Quercus cerris x Q. robur
AbstractPedunculate oak (Quercus robur L.) is one of the widely used and
dendrochronologically investigated species in Europe. Still, it is a
problematical dating object if its outermost section is missing partly or
totally. Thus, we need sapwood estimation of living trees. As sapwood
amount varies geographically, numbers of sapwood rings have been published
for different regions in Europe but no such estimation has been done for
the Baltic States yet. Therefore, this paper deals with the estimation of
pedunculate oak sapwood growing in the eastern Baltic region, i.e. in
Finland, Estonia, Latvia, and Lithuania.In total, 668 oak core samples of
living trees from 43 stands were investigated. Ring widths were measured
and the number of sapwood rings was determined according to two criteria:
difference of colour and absence of tyloses in earlywood vessels. The
samples were divided into two sets, according to the tH-values between site
chronologies and the major geobotanical sub-provinces. Thus, the nine
Finnish and western Estonian sites were attributed to the western region
and the 34 eastern Estonian, Latvian and Lithuanian sites to the eastern
region.As the result of a statistical analysis, we explain that the number
of oak sapwood rings ranges from 4.09 to 20.85 and 6.45 to 18.02 within 95%
confidence limits in the western and eastern regions, respectively. For the
three Baltic countries and southern Finland in general, we recommend to
consider a sapwood estimate of 6.18–18.71 rings. Regarding earlier studies,
the general European trend of decreasing sapwood ring number towards the
east was confirmed. A geographical pattern of eastward decrease of the
median sapwood ring number was noticed in the Baltics as well. The
chronology based upon 668 samples of living oak trees from all sites
covered the period of 1631–2008.
From: hamadryad@xxxxxxxx.co.uk
To: uktc@xxxxxx.tree-care.info
Subject: RE: Quercus cerris x Q. robur
Date: Thu, 17 May 2012 21:10:07 +0100
Come on Luke you know it takes more than minerals to grow, and that robur
would be on steroids to do 10mm annualy year on year, what about the
drought years we had? do you have rings on those logs from that period?
I do like playing betting games on certain ecological aspects, and this
ones going to be like a bad penny!
Subject: Re: Quercus cerris x Q. robur
To: uktc@xxxxxx.tree-care.info
From: luketreescapes@xxxxxxxxxxx.com
Date: Thu, 17 May 2012 20:03:57 +0000
Tony,
Alternatively it may be a native oak growing on a buried cow - lots of
nitrogen. That was one of the potential reasons my Prof used to cite
for fast growing trees - as well as others. He did his PhD on mineral
nutrition of trees.
Regards
Luke Steer
Chartered Arboriculturist
Treescapes Consultancy Ltd.
Tel: 015394 34698
Mobile: 07734 113964
www.treescapesconsultancy.co.uk
-----Original Message-----
From: antony croft <hamadryad@xxxxxxxx.co.uk>
Date: Thu, 17 May 2012 20:50:25
To: UK Tree Care<uktc@xxxxxx.tree-care.info>
Reply-To: uktc@xxxxxx.tree-care.info
Subject: RE: Quercus cerris x Q. robur
a ha, you have one of our silent stealth assassins!
From: luketreescapes@xxxxxxxxxxx.com
To: uktc@xxxxxx.tree-care.info
Subject: Quercus cerris x Q. robur
Date: Thu, 17 May 2012 19:50:22 +0100
Dear All,
Some of you may find this account of Quercus cerris interesting. I
don't
know enough about its ability to hybridise with Q. robur to have an
opinion.
Part of the reason for hunting out information on Q. robur x Q.
cerris hybrids, in addition to Tony's posts, is that I'm
currently burning oak logs with annual rings that are over 10mm wide
and very white wood, no heartwood.
I was curious about whether it may have been a tree with hybrid
vigour.
http://sppaccounts.bsbi.org.uk/content/quercus-cerris-1
Regards
Luke Steer
Chartered Arboriculturist
Treescapes Consultancy Ltd.
Office: 015394 34698
Mobile: 07734 113964
Web: www.treescapesconsultancy.co.uk
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