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Non-destructive met...
Non-destructive methods for assessing tree fiber length distributions in standing trees
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- Sjöstedt de Luna, Sara, 1964- (författare)
- Umeå universitet,Institutionen för matematik och matematisk statistik
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- Abramowicz, Konrad, 1983- (författare)
- Umeå universitet,Institutionen för matematik och matematisk statistik
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- Pya Arnqvist, Natalya, universitetslektor (författare)
- Umeå universitet,Institutionen för matematik och matematisk statistik
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(creator_code:org_t)
- 2021
- Engelska 25 s.
- Relaterad länk:
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https://arxiv.org/ab...
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https://urn.kb.se/re...
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Abstract
Ämnesord
Stäng
- One of the main concerns of silviculture and forest management focuses on finding fast, cost-efficient and non-destructive ways of measuring wood properties in standing trees. This paper presents an R package \verb+fiberLD+ that provides functions for estimating tree fiber length distributions in the standing tree based on increment core samples. The methods rely on increment core data measured by means of an optical fiber analyzer (OFA) or measured by microscopy. Increment core data analyzed by OFAs consist of the cell lengths of both cut and uncut fibers (tracheids) and fines (such as ray parenchyma cells) without being able to identify which cells are cut or if they are fines or fibers. The microscopy measured data consist of the observed lengths of the uncut fibers in the increment core. A censored version of a mixture of the fine and fiber length distributions is proposed to fit the OFA data, under distributional assumptions. Two choices for the assumptions of the underlying density functions of the true fiber (fine) lengths of those fibers (fines) that at least partially appear in the increment core are considered, such as the generalized gamma and the log normal densities. Maximum likelihood estimation is used for estimating the model parameters for both the OFA analyzed data and the microscopy measured data.
Ämnesord
- NATURVETENSKAP -- Matematik -- Sannolikhetsteori och statistik (hsv//swe)
- NATURAL SCIENCES -- Mathematics -- Probability Theory and Statistics (hsv//eng)
Nyckelord
- fiber length
- censoring
- increment core
- generalized gamma
- mixture density
- Statistics
- statistik
Publikations- och innehållstyp
- vet (ämneskategori)
- ovr (ämneskategori)