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Evaluation of individual-tree growth models for Picea abies based on a case study of an uneven-sized stand in southern Sweden

Fagerberg, Nils and Lohmander, Peter and Eriksson, Ola and Olsson, Jan-Ola and Poudel, Bishnu Chandra and Bergh, Johan (2022). Evaluation of individual-tree growth models for Picea abies based on a case study of an uneven-sized stand in southern Sweden. Scandinavian Journal of Forest Research. 37 :1 , 45-58
[Research article]

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Abstract

To develop recommendations for tree selection in Continuous Cover Forestry (CCF), access to valid tools for simulating growth at individual tree-level is necessary. To assist efforts to develop such tools, in this study, long-term observation data from two uneven-sized Norway spruce plots in southern Sweden are used to evaluate old and new individual-tree growth models (two established Swedish models, two new preliminary models and included as a reference, a Finnish model). The plots' historical management records and site conditions are the same, but their last thinning treatment differs. Observed diameter increment at tree-level is investigated in relation to treatment. Individual tree growth residuals of tested models are evaluated in relation to tree diameter, treatment, projection length and sensitivity to the predictor mean stand age. Furthermore, the relations between displayed residuals and basal area local competition are analysed. The analyses indicate that active thinning made annual diameter increment independent of tree diameter above a threshold level, while the absence of thinning supported a concave relationship. All tested models displayed a significant linear bias leading to overestimation of small trees' growth and increasing underestimations of larger trees' growth with tree diameter. All distance-independent models displayed residual trends related to local competition.

Authors/Creators:Fagerberg, Nils and Lohmander, Peter and Eriksson, Ola and Olsson, Jan-Ola and Poudel, Bishnu Chandra and Bergh, Johan
Title:Evaluation of individual-tree growth models for Picea abies based on a case study of an uneven-sized stand in southern Sweden
Series Name/Journal:Scandinavian Journal of Forest Research
Year of publishing :2022
Volume:37
Number:1
Page range:45-58
Number of Pages:14
Publisher:TAYLOR AND FRANCIS AS
ISSN:0282-7581
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution-Noncommercial-No Derivative Works 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Forest Science
Keywords:Continuous Cover Forestry, single-tree growth models, selective cutting, uneven-aged, single-tree selection, growth prediction
URN:NBN:urn:nbn:se:slu:epsilon-p-116481
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-116481
Additional ID:
Type of IDID
DOI10.1080/02827581.2022.2037700
Web of Science (WoS)000763179300001
ID Code:27638
Faculty:S - Faculty of Forest Sciences
Department:(S) > Dept. of Forest Resource Management
(NL, NJ) > Dept. of Forest Resource Management
Deposited By: SLUpub Connector
Deposited On:26 Apr 2022 14:08
Metadata Last Modified:26 Apr 2022 14:11

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