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Stand transpiration and sapflow density in relation to weather, soil moisture and stand characteristics

Lundblad, M and Lindroth, Anders LU (2002) In Basic and Applied Ecology 3(3). p.229-243
Abstract
Sapflow density was measured in six stands in a boreal forest in central Sweden, to assess its dependence on soil moisture and stand characteristics. The stands were mixed and pure Scots pine and Norway spruce stands, which were between 34 and 105 years old. Sapflow was measured in 12 trees per stand using the Granier method during two contrasting growing seasons; one warm and dry and one wet and cool. The canopy conductance of the stands was estimated by the inverse of the Penman-Monteith equation, using time-lag-adjusted sapflow as input. Maximum canopy conductance varied between 8 mm s(-1) and 88 mm s(-1) for the stand with the lowest and highest conductance, respectively. Transpiration was higher in the dry, warm season, mean values... (More)
Sapflow density was measured in six stands in a boreal forest in central Sweden, to assess its dependence on soil moisture and stand characteristics. The stands were mixed and pure Scots pine and Norway spruce stands, which were between 34 and 105 years old. Sapflow was measured in 12 trees per stand using the Granier method during two contrasting growing seasons; one warm and dry and one wet and cool. The canopy conductance of the stands was estimated by the inverse of the Penman-Monteith equation, using time-lag-adjusted sapflow as input. Maximum canopy conductance varied between 8 mm s(-1) and 88 mm s(-1) for the stand with the lowest and highest conductance, respectively. Transpiration was higher in the dry, warm season, mean values for the different stands ranging between 1.30 to 4.64 mm day(-1) during July to September. The corresponding range in the wet, cool season was 0.95 to 2.65 mm day(-1). Besides climatic factors, stand age, stem density and diameter explained most of the variation in sapflow density. By use of multiple regression analysis for 5-day periods it was possible to estimate sapflow density and transpiration for a larger area of the forest. This upscaled area) transpiration was compared with evaporation measured by an eddy-correlation system located centrally in the area. It was shown that areal transpiration constituted 78% of total evaporation in the warm, dry season and 52% in the wet, cool season. It was not possible to establish with confidence a critical limit for soil water at which transpiration began to be reduced, mainly because of wide scatter in the relationship between potential and actual transpiration. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Picea abies, Pinus sylvestris, coupling factor, heat dissipation, Lohammar equation, areal transpiration, boreal forest
in
Basic and Applied Ecology
volume
3
issue
3
pages
229 - 243
publisher
Elsevier
external identifiers
  • wos:000177365000004
  • scopus:0036073764
ISSN
1618-0089
DOI
10.1078/1439-1791-00099
language
English
LU publication?
yes
id
bff8faaa-c732-417f-943d-cff11e591bd1 (old id 331815)
date added to LUP
2007-11-02 10:26:39
date last changed
2017-09-10 03:39:12
@article{bff8faaa-c732-417f-943d-cff11e591bd1,
  abstract     = {Sapflow density was measured in six stands in a boreal forest in central Sweden, to assess its dependence on soil moisture and stand characteristics. The stands were mixed and pure Scots pine and Norway spruce stands, which were between 34 and 105 years old. Sapflow was measured in 12 trees per stand using the Granier method during two contrasting growing seasons; one warm and dry and one wet and cool. The canopy conductance of the stands was estimated by the inverse of the Penman-Monteith equation, using time-lag-adjusted sapflow as input. Maximum canopy conductance varied between 8 mm s(-1) and 88 mm s(-1) for the stand with the lowest and highest conductance, respectively. Transpiration was higher in the dry, warm season, mean values for the different stands ranging between 1.30 to 4.64 mm day(-1) during July to September. The corresponding range in the wet, cool season was 0.95 to 2.65 mm day(-1). Besides climatic factors, stand age, stem density and diameter explained most of the variation in sapflow density. By use of multiple regression analysis for 5-day periods it was possible to estimate sapflow density and transpiration for a larger area of the forest. This upscaled area) transpiration was compared with evaporation measured by an eddy-correlation system located centrally in the area. It was shown that areal transpiration constituted 78% of total evaporation in the warm, dry season and 52% in the wet, cool season. It was not possible to establish with confidence a critical limit for soil water at which transpiration began to be reduced, mainly because of wide scatter in the relationship between potential and actual transpiration.},
  author       = {Lundblad, M and Lindroth, Anders},
  issn         = {1618-0089},
  keyword      = {Picea abies,Pinus sylvestris,coupling factor,heat dissipation,Lohammar equation,areal transpiration,boreal forest},
  language     = {eng},
  number       = {3},
  pages        = {229--243},
  publisher    = {Elsevier},
  series       = {Basic and Applied Ecology},
  title        = {Stand transpiration and sapflow density in relation to weather, soil moisture and stand characteristics},
  url          = {http://dx.doi.org/10.1078/1439-1791-00099},
  volume       = {3},
  year         = {2002},
}