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Critical length sampling for estimating the volume of coarse woody debris

Ståhl, Göran (2003). Critical length sampling for estimating the volume of coarse woody debris. Umeå: (S) > Dept. of Forest Resource Management
(NL, NJ) > Dept. of Forest Resource Management
, Sveriges lantbruksuniversitet. Arbetsrapport / Sveriges lantbruksuniversitet, Institutionen för skoglig resurshushållning och geomatik ; 116
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Abstract

In this paper, critical length sampling for estimating the volume of downed coarse woody
debris is presented. With critical length sampling, the volume of downed dead wood in a
stand can be determined by summing the critical lengths of trees included in the sample.
The critical length of a downed tree is the length of the &em section, which from a certain
sample point is coarse enough to be counted when a relascope is used. In comparison to
traditional relascope sampling, where the instrument is held vertically during the mea­
surements, the instrument is operated horizontally.
By combining critical length sampling with critical height sampling-a method
previously described for estimating the volume of standing trees -the total volume of
dead wood can be estimated in a stand. It is proposed that the main area of use of the
combined method would be in connection with rapid in-place inventories where a quick
estimate of the volume of dead wood is needed. In this context, the combined critical
height-critical length method provides a relatively simple means for obtaining such an
estimate.
In this report, the theoretical background is described and a short description of the use of
the method in the field is presented. The report should be considered as a simple first
description of the method, which will later on be complemented with a more compre­
hensive proof, efficiency comparisons with other methods, and experiences from field
tests.

Authors/Creators:Ståhl, Göran
Title:Critical length sampling for estimating the volume of coarse woody debris
Series/Journal:Arbetsrapport / Sveriges lantbruksuniversitet, Institutionen för skoglig resurshushållning och geomatik (1401-1204)
Year of publishing :2003
Number:116
Number of Pages:8
Place of Publication:Umeå
Publisher:Institutionen för skoglig resurshushållning, Sveriges lantbruksuniversitet
ISSN:1401-1204
Language:English
Publication Type:Report
Full Text Status:Public
Agris subject categories.:K Forestry > K10 Forestry production
P Natural resources > P01 Nature conservation and land resources
Subjects:Obsolete subject words > FORESTRY, AGRICULTURAL SCIENCES and LANDSCAPE PLANNING > Soil science
Obsolete subject words > FORESTRY, AGRICULTURAL SCIENCES and LANDSCAPE PLANNING > Plant production > Forestry
Obsolete subject words > FORESTRY, AGRICULTURAL SCIENCES and LANDSCAPE PLANNING > Landscape planning > Nature conservation and landscape management
Agrovoc terms:deadwood, volume, sampling, measuring instruments, statistical methods, forest inventories
Keywords:deadwood, sampling, statistical methods, forest inventories
URN:NBN:urn:nbn:se:slu:epsilon-e-543
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-543
ID Code:8883
Department:(S) > Dept. of Forest Resource Management
(NL, NJ) > Dept. of Forest Resource Management
Deposited By: Bo Jonsson
Deposited On:28 May 2012 12:34
Metadata Last Modified:02 Dec 2014 10:50

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