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Variation in sapflow and stem growth in relation to tree size, competition and thinning in a mixed forest of pine and spruce in Sweden

Lagergren, Fredrik LU and Lindroth, Anders LU (2004) In Forest Ecology and Management 188(1-3). p.51-63
Abstract
The aim of this study was to analyse the relationship between different biometric parameters and sapflow and growth, respectively, in order to assess their potential for use in scaling. The effect of thinning on these relationships was also investigated. The studied stand consisted of Scots pine (ca. 60%), Norway spruce (ca. 35%) and downy birch (ca. 5%). Sapflow was measured by the tissue heat-balance method, and growth in circumference was measured by dendrometer bands, during a 3-year period. The thinning was carried out after 1 year of measurements. Regressions were calculated between sapflow and growth and tree diameter, needle mass estimated by allometry, and a competition index (CI), which depended on the distance and diameter of... (More)
The aim of this study was to analyse the relationship between different biometric parameters and sapflow and growth, respectively, in order to assess their potential for use in scaling. The effect of thinning on these relationships was also investigated. The studied stand consisted of Scots pine (ca. 60%), Norway spruce (ca. 35%) and downy birch (ca. 5%). Sapflow was measured by the tissue heat-balance method, and growth in circumference was measured by dendrometer bands, during a 3-year period. The thinning was carried out after 1 year of measurements. Regressions were calculated between sapflow and growth and tree diameter, needle mass estimated by allometry, and a competition index (CI), which depended on the distance and diameter of neighbouring trees. Both sapflow and growth were affected by strip-roads from a thinning ca. 8 years earlier. Before thinning, the variation in sapflow for spruce was best explained by CI when trees close to a strip-road were excluded; for pine, needle mass was equally as good as CI. In 1999 and 2000, needle mass generally explained the variation in sapflow best. Before thinning, the variation in pine growth was explained almost as well by diameter alone, as by CI. For spruce, needle mass explained most of the variation if all trees were included. If trees beside strip-roads were excluded, r(2) for CI increased and CI explained the variation best. Almost all spruces close to strip-roads had lower growth than was expected from their CI relationships; for pine, 13 of 23 trees had higher growth than expected. For the years after thinning, diameter was mostly at least as good as the other variables for predicting BA growth. It was concluded that a competition index is potentially useful for scaling, and that strip-roads affected both sapflow and growth of nearby trees. This should be considered in sampling design as well as in scaling up to stand level. (C) 2003 Elsevier B.V. All rights reserved. (Less)
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author
organization
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type
Contribution to journal
publication status
published
subject
keywords
biometric parameters, Pinus sylvestris, Picea abies, individual tree function, scaling
in
Forest Ecology and Management
volume
188
issue
1-3
pages
51 - 63
publisher
Elsevier
external identifiers
  • wos:000188294900005
  • scopus:0842306471
ISSN
1872-7042
DOI
10.1016/j.foreco.2003.07.018
language
English
LU publication?
yes
id
cc84bad8-e16f-4687-9999-3d775024631d (old id 289088)
date added to LUP
2007-10-24 07:37:54
date last changed
2017-09-24 04:16:58
@article{cc84bad8-e16f-4687-9999-3d775024631d,
  abstract     = {The aim of this study was to analyse the relationship between different biometric parameters and sapflow and growth, respectively, in order to assess their potential for use in scaling. The effect of thinning on these relationships was also investigated. The studied stand consisted of Scots pine (ca. 60%), Norway spruce (ca. 35%) and downy birch (ca. 5%). Sapflow was measured by the tissue heat-balance method, and growth in circumference was measured by dendrometer bands, during a 3-year period. The thinning was carried out after 1 year of measurements. Regressions were calculated between sapflow and growth and tree diameter, needle mass estimated by allometry, and a competition index (CI), which depended on the distance and diameter of neighbouring trees. Both sapflow and growth were affected by strip-roads from a thinning ca. 8 years earlier. Before thinning, the variation in sapflow for spruce was best explained by CI when trees close to a strip-road were excluded; for pine, needle mass was equally as good as CI. In 1999 and 2000, needle mass generally explained the variation in sapflow best. Before thinning, the variation in pine growth was explained almost as well by diameter alone, as by CI. For spruce, needle mass explained most of the variation if all trees were included. If trees beside strip-roads were excluded, r(2) for CI increased and CI explained the variation best. Almost all spruces close to strip-roads had lower growth than was expected from their CI relationships; for pine, 13 of 23 trees had higher growth than expected. For the years after thinning, diameter was mostly at least as good as the other variables for predicting BA growth. It was concluded that a competition index is potentially useful for scaling, and that strip-roads affected both sapflow and growth of nearby trees. This should be considered in sampling design as well as in scaling up to stand level. (C) 2003 Elsevier B.V. All rights reserved.},
  author       = {Lagergren, Fredrik and Lindroth, Anders},
  issn         = {1872-7042},
  keyword      = {biometric parameters,Pinus sylvestris,Picea abies,individual tree function,scaling},
  language     = {eng},
  number       = {1-3},
  pages        = {51--63},
  publisher    = {Elsevier},
  series       = {Forest Ecology and Management},
  title        = {Variation in sapflow and stem growth in relation to tree size, competition and thinning in a mixed forest of pine and spruce in Sweden},
  url          = {http://dx.doi.org/10.1016/j.foreco.2003.07.018},
  volume       = {188},
  year         = {2004},
}