Jim Shirley posted the following inquiry:
>Forestry Corporation of New Zealand manages about 190,000 ha of radiata
pine plantations. It produces about 1 million m3 of pulpwood each year from
thinning and clearfelling.
>
>We need to be able to measure the changes in the basic density (Oven dry wei
ght/cubic metre of wood) of the pulpwood over time, as it leaves the forest.
>
>We would like to take wood samples from truckloads of logs as they leave
the forest, and do the density analysis on these samples.
>
>We are looking for a mechanical device which will take these samples. An inc
rement borer is not a suitable tool because it doesn't sample the volume
of the log in proportion to the radial variation in density in the log. Ideally
the sample should be wedge-shaped and at right angles to the long axis of the
log.
>
>An article by Torborjn Okstad in Forest Products Journal (20:8, 1970) des
cribes a prototype machine which looked like a chainsaw and cut chips from a
wedge-shaped section of the log.
>
>We would like to contact anyone who has had any experience or knowledge
of such a tool and/or experience in sampling for basic density changes in the
manner described.
>
>
>Jim Shirley
>Forest Resources & Valuation Mgr, Forestry Corporation of NZ Ltd, Rotorua,
New Zealand
>Email : shirleyj@fcnz.co.nz, and shirleyj@poly.waiariki.ac.nz,
>
>
Kjell Pernestal replied:
The problem of sampling truck loads has been tested in some projects in Sweden
I have myself been involved in one of the projects years ago.
I suggest you try to contact prof Mats Nylinder, Swedish University of Agri
cultural Sciencies, S-750 07 UPPSALA, e-mail mats.nylinder@vl.slu.se. I
do not know, however, if he is using his e-mail.
The following reply is new contribution by Ralph Johnson:
From: Ralph R. Johnson:W04A
Internet: /s=r.johnson/ou1=w04a@mhs-fswa.attmail.com
Postmark: Sep 05,95 1:22 PM Delivered: Sep 05,95 1:27 PM
Status: Previously read Subject: Reply to: Forwarded: Re: Management: Sampling pulpwood density
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Reply text:
From: Ralph R. Johnson:W04A
Date: Sep 05,95 1:22 PM At the US Forest Service Forest Management Service Cent
er, we've used
a xylodensiometer for estimating log weights. The technique is to
use an increment borer and a float arrangement which has been
calibrated to the particular borers. One uses a scale which has been
adjusted for heartwood and sapwood. Basically you use a fixed core
length of heartwood and sapwood and access a chart which adjusts to
the tree's actual percent heartwood and sapwood. Ralph Johnson
Preceding message:
From: Raymond Czaplewski:S28A
Date: Sep 05,95 11:55 AM
Ralph, here's reference on load scaling.
Previous comments:
From: Kjell Pernestel:X400
Date: Sep 01,95 12:35 PM
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