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Transpiration response to soil moisture in pine and spruce trees in Sweden

Lagergren, Fredrik LU and Lindroth, Anders LU (2002) In Agricultural and Forest Meteorology 112(2). p.67-85
Abstract
Variation in transpiration and conductance between individual trees of Scots pine and Norway spruce was investigated in a mixed 50-year-old stand in central Sweden. Daily transpiration rates were measured by the tissue heat balance method on five trees of each species during a dry, warm growing season. Daytime averages of sapflow, climatic variables and soil water content were used to fit an empirical model of tree conductance for each tree. Conductance per unit needle area was about twice as high in pine as in spruce, while equal-sized trees transpired similarly in both species. Conductance generally decreased more steeply with increasing vapour pressure deficit and increased faster with increasing light in pine than in spruce, although... (More)
Variation in transpiration and conductance between individual trees of Scots pine and Norway spruce was investigated in a mixed 50-year-old stand in central Sweden. Daily transpiration rates were measured by the tissue heat balance method on five trees of each species during a dry, warm growing season. Daytime averages of sapflow, climatic variables and soil water content were used to fit an empirical model of tree conductance for each tree. Conductance per unit needle area was about twice as high in pine as in spruce, while equal-sized trees transpired similarly in both species. Conductance generally decreased more steeply with increasing vapour pressure deficit and increased faster with increasing light in pine than in spruce, although one individual spruce behaved more like the pines. Inclusion of a linear or exponential function for air temperature improved the model for pine, but of the spruces, only one tree showed a clear temperature dependency. The response to decreasing soil water content varied widely; the spruces tended to be more sensitive to drought than the pines. When the drought was at its worst, no sapflow could be detected in some of the trees. On average, the reduction in transpiration began when ca. 80% of the extractable water in the rooting zone had been depleted. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
transpiration, stomatal conductance, drought, Pinus sylvestris, abies, Picea
in
Agricultural and Forest Meteorology
volume
112
issue
2
pages
67 - 85
publisher
Elsevier
external identifiers
  • wos:000177563000001
  • scopus:0037206129
ISSN
1873-2240
DOI
10.1016/S0168-1923(02)00060-6
language
English
LU publication?
yes
id
a4ca7ed0-36cc-4127-a221-54b4df1aa57a (old id 331158)
date added to LUP
2007-10-31 09:58:37
date last changed
2017-11-05 04:29:07
@article{a4ca7ed0-36cc-4127-a221-54b4df1aa57a,
  abstract     = {Variation in transpiration and conductance between individual trees of Scots pine and Norway spruce was investigated in a mixed 50-year-old stand in central Sweden. Daily transpiration rates were measured by the tissue heat balance method on five trees of each species during a dry, warm growing season. Daytime averages of sapflow, climatic variables and soil water content were used to fit an empirical model of tree conductance for each tree. Conductance per unit needle area was about twice as high in pine as in spruce, while equal-sized trees transpired similarly in both species. Conductance generally decreased more steeply with increasing vapour pressure deficit and increased faster with increasing light in pine than in spruce, although one individual spruce behaved more like the pines. Inclusion of a linear or exponential function for air temperature improved the model for pine, but of the spruces, only one tree showed a clear temperature dependency. The response to decreasing soil water content varied widely; the spruces tended to be more sensitive to drought than the pines. When the drought was at its worst, no sapflow could be detected in some of the trees. On average, the reduction in transpiration began when ca. 80% of the extractable water in the rooting zone had been depleted.},
  author       = {Lagergren, Fredrik and Lindroth, Anders},
  issn         = {1873-2240},
  keyword      = {transpiration,stomatal conductance,drought,Pinus sylvestris,abies,Picea},
  language     = {eng},
  number       = {2},
  pages        = {67--85},
  publisher    = {Elsevier},
  series       = {Agricultural and Forest Meteorology},
  title        = {Transpiration response to soil moisture in pine and spruce trees in Sweden},
  url          = {http://dx.doi.org/10.1016/S0168-1923(02)00060-6},
  volume       = {112},
  year         = {2002},
}