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Dendrometer analysis of tree water dynamics and radial stem growth of Norway spruce in Hyltemossa

Weibull, Martin LU (2024) In Student thesis series INES NGEK01 20241
Dept of Physical Geography and Ecosystem Science
Abstract
Forests which form a central part in climate change mitigation strategy of Sweden and as precipitation patterns shift and temperatures rise, understanding the responses of forests to these shifts becomes of paramount importance. Automatic high resolution dendrometers have allowed for the continuous measurement of tree radial stem growth and water dynamics, allowing for the forcings of meteorological variables to be studied at a minute-by-minute scale. This allows for the determination of which meteorological variables that drive these processes. This study assesses the conditions and dynamics of Norway spruce (Picea abies (L.) H. Karst.) in Hyltemossa, a managed forest in Southern Sweden. It was hypothesised that vapor pressure deficit... (More)
Forests which form a central part in climate change mitigation strategy of Sweden and as precipitation patterns shift and temperatures rise, understanding the responses of forests to these shifts becomes of paramount importance. Automatic high resolution dendrometers have allowed for the continuous measurement of tree radial stem growth and water dynamics, allowing for the forcings of meteorological variables to be studied at a minute-by-minute scale. This allows for the determination of which meteorological variables that drive these processes. This study assesses the conditions and dynamics of Norway spruce (Picea abies (L.) H. Karst.) in Hyltemossa, a managed forest in Southern Sweden. It was hypothesised that vapor pressure deficit (VPD) was the main driver in determining the radial growth, however the utilized methodology prevented the effects of VPD to be disaggregated from precipitation, relative humidity (RH) and photosynthetic photon flux density (PPFD). However, air temperature showed a weaker link to radial growth compared to other factors. A secondary hypothesis detailed that maximum day swelling correlated with factors driving stomatal conductance, in particular PPFD and VPD, however only maximum temperature and VPD were found to be correlated, and only under tree water stress.
Key findings highlight the bimodal distribution of total radial growth, variable lengths of radial growth between trees, absence of lagged meteorological effects, and the central role of atmospheric moisture and PPFD in limiting when radial growth occurs. (Less)
Please use this url to cite or link to this publication:
author
Weibull, Martin LU
supervisor
organization
course
NGEK01 20241
year
type
M2 - Bachelor Degree
subject
keywords
Norway Spruce, Picea abies, Point dendrometer, Stem radial variations, Tree water relations, Radial stem growth, Hyltemossa, Maximum day shrinkage, Zero growth, ZG
publication/series
Student thesis series INES
report number
653
language
English
id
9170471
date added to LUP
2024-07-11 14:38:49
date last changed
2024-07-11 14:38:49
@misc{9170471,
  abstract     = {{Forests which form a central part in climate change mitigation strategy of Sweden and as precipitation patterns shift and temperatures rise, understanding the responses of forests to these shifts becomes of paramount importance. Automatic high resolution dendrometers have allowed for the continuous measurement of tree radial stem growth and water dynamics, allowing for the forcings of meteorological variables to be studied at a minute-by-minute scale. This allows for the determination of which meteorological variables that drive these processes. This study assesses the conditions and dynamics of Norway spruce (Picea abies (L.) H. Karst.) in Hyltemossa, a managed forest in Southern Sweden. It was hypothesised that vapor pressure deficit (VPD) was the main driver in determining the radial growth, however the utilized methodology prevented the effects of VPD to be disaggregated from precipitation, relative humidity (RH) and photosynthetic photon flux density (PPFD). However, air temperature showed a weaker link to radial growth compared to other factors. A secondary hypothesis detailed that maximum day swelling correlated with factors driving stomatal conductance, in particular PPFD and VPD, however only maximum temperature and VPD were found to be correlated, and only under tree water stress. 
Key findings highlight the bimodal distribution of total radial growth, variable lengths of radial growth between trees, absence of lagged meteorological effects, and the central role of atmospheric moisture and PPFD in limiting when radial growth occurs.}},
  author       = {{Weibull, Martin}},
  language     = {{eng}},
  note         = {{Student Paper}},
  series       = {{Student thesis series INES}},
  title        = {{Dendrometer analysis of tree water dynamics and radial stem growth of Norway spruce in Hyltemossa}},
  year         = {{2024}},
}