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Forest structure and soil fertility determine internal stem morphology of Pedunculate oak: a modelling approach using boosted regression trees

Vincent Kint, Dries Vansteenkiste UGent, Wim Aertsen, Bruno De Vos, Raphael Bequet, Joris Van Acker UGent and Bart Muys (2012) EUROPEAN JOURNAL OF FOREST RESEARCH. 131(3). p.609-622
abstract
This study aims at the explanation of internal stem morphology of vital (co)dominant Pedunculate oak (Quercus robur L.) trees in homogeneous even-aged high-forests by the factors tree age, forest structure and site quality, using boosted regression trees as a powerful modelling technique. The study area covers the region of Flanders (Northern Belgium), which is characterised by the absence of strong topographic and climatic gradients. For 76 adult sample trees covering the entire productivity range of Pedunculate oak, morphological characteristics were derived from measurements of ring width or heartwood area on wood cores. Forest structure, soil physicochemical properties, humus quality, vegetation indices and litter nutrient contents were quantified at each sample location. Model predictive performance and generality are good. Tree age effects correspond to expected trends in age-related radial growth and heartwood portion. Even if management of oak trees in even-aged high-forests is rather similar over Flanders, forest structure is the most important factor determining ring width, followed by soil fertility. Heartwood portion is determined by soil fertility and crown structure. Effects of topsoil and humus physicochemical characteristics, litter nutrient contents and water supply mainly confirm autecological knowledge on oak. However, variables related to soil water availability are only occasionally relevant, and always of lower importance than soil fertility. The low importance of water availability in the models contradicts results from other studies, and the potential effect of confounding is discussed. The observed growth reduction at low litter N/P ratios might be indirectly linked to early litterfall.
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
published
subject
keyword
Site quality, Tree competition, Heartwood, Boosted regression trees, Quercus robur L., Litterfall, Radial growth, QUERCUS-PETRAEA LIEBL., FAGUS-SYLVATICA L., SESSILE OAK, NORTHERN FRANCE, RADIAL GROWTH, WOOD DENSITY, BULK-DENSITY, SITE INDEX, BASAL AREA, LEAF-AREA
journal title
EUROPEAN JOURNAL OF FOREST RESEARCH
Eur. J. For. Res.
volume
131
issue
3
pages
609 - 622
Web of Science type
Article
Web of Science id
000302418400008
JCR category
FORESTRY
JCR impact factor
1.959 (2012)
JCR rank
9/60 (2012)
JCR quartile
1 (2012)
ISSN
1612-4669
DOI
10.1007/s10342-011-0535-z
project
IWT-SBO contract 060032
language
English
UGent publication?
yes
classification
A1
copyright statement
I have transferred the copyright for this publication to the publisher
id
1891859
handle
http://hdl.handle.net/1854/LU-1891859
date created
2011-08-23 17:25:47
date last changed
2012-07-03 14:08:01
@article{1891859,
  abstract     = {This study aims at the explanation of internal stem morphology of vital (co)dominant Pedunculate oak (Quercus robur L.) trees in homogeneous even-aged high-forests by the factors tree age, forest structure and site quality, using boosted regression trees as a powerful modelling technique. The study area covers the region of Flanders (Northern Belgium), which is characterised by the absence of strong topographic and climatic gradients. For 76 adult sample trees covering the entire productivity range of Pedunculate oak, morphological characteristics were derived from measurements of ring width or heartwood area on wood cores. Forest structure, soil physicochemical properties, humus quality, vegetation indices and litter nutrient contents were quantified at each sample location. Model predictive performance and generality are good. Tree age effects correspond to expected trends in age-related radial growth and heartwood portion. Even if management of oak trees in even-aged high-forests is rather similar over Flanders, forest structure is the most important factor determining ring width, followed by soil fertility. Heartwood portion is determined by soil fertility and crown structure. Effects of topsoil and humus physicochemical characteristics, litter nutrient contents and water supply mainly confirm autecological knowledge on oak. However, variables related to soil water availability are only occasionally relevant, and always of lower importance than soil fertility. The low importance of water availability in the models contradicts results from other studies, and the potential effect of confounding is discussed. The observed growth reduction at low litter N/P ratios might be indirectly linked to early litterfall.},
  author       = {Kint, Vincent and Vansteenkiste, Dries and Aertsen, Wim and De Vos, Bruno and Bequet, Raphael and Van Acker, Joris and Muys, Bart},
  issn         = {1612-4669},
  journal      = {EUROPEAN JOURNAL OF FOREST RESEARCH},
  keyword      = {Site quality,Tree competition,Heartwood,Boosted regression trees,Quercus robur L.,Litterfall,Radial growth,QUERCUS-PETRAEA LIEBL.,FAGUS-SYLVATICA L.,SESSILE OAK,NORTHERN FRANCE,RADIAL GROWTH,WOOD DENSITY,BULK-DENSITY,SITE INDEX,BASAL AREA,LEAF-AREA},
  language     = {eng},
  number       = {3},
  pages        = {609--622},
  title        = {Forest structure and soil fertility determine internal stem morphology of Pedunculate oak: a modelling approach using boosted regression trees},
  url          = {http://dx.doi.org/10.1007/s10342-011-0535-z},
  volume       = {131},
  year         = {2012},
}

Chicago
Kint, Vincent, Dries Vansteenkiste, Wim Aertsen, Bruno De Vos, Raphael Bequet, Joris Van Acker, and Bart Muys. 2012. “Forest Structure and Soil Fertility Determine Internal Stem Morphology of Pedunculate Oak: a Modelling Approach Using Boosted Regression Trees.” European Journal of Forest Research 131 (3): 609–622.
APA
Kint, V., Vansteenkiste, D., Aertsen, W., De Vos, B., Bequet, R., Van Acker, J., & Muys, B. (2012). Forest structure and soil fertility determine internal stem morphology of Pedunculate oak: a modelling approach using boosted regression trees. EUROPEAN JOURNAL OF FOREST RESEARCH, 131(3), 609–622.
Vancouver
1.
Kint V, Vansteenkiste D, Aertsen W, De Vos B, Bequet R, Van Acker J, et al. Forest structure and soil fertility determine internal stem morphology of Pedunculate oak: a modelling approach using boosted regression trees. EUROPEAN JOURNAL OF FOREST RESEARCH. 2012;131(3):609–22.
MLA
Kint, Vincent, Dries Vansteenkiste, Wim Aertsen, et al. “Forest Structure and Soil Fertility Determine Internal Stem Morphology of Pedunculate Oak: a Modelling Approach Using Boosted Regression Trees.” EUROPEAN JOURNAL OF FOREST RESEARCH 131.3 (2012): 609–622. Print.