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Tuesday, 2 May 2017

Intra-annual stem growth dynamics of Lebanon Cedar along climatic gradients

Published Date
Volume 31, Issue 2pp 587–606

Author
  • Aylin Güney
  • Manfred Küppers
  • Cyrille Rathgeber
  • Melahat Şahin
  • Reiner Zimmermann
  1. 1.
  2. 2.
  3. 3.
Original Article
DOI: 10.1007/s00468-016-1492-4
Cite this article as:
Güney, A., Küppers, M., Rathgeber, C. et al. Trees (2017) 31: 587. doi:10.1007/s00468-016-1492-4

Abstract

Key message

Onset of cambial activity in Lebanon Cedar is triggered by stem temperature but may be delayed by high site-LAI. Higher growth rates and tree-ring widths were observed under better water and light availability. Daily stem radius variations were sensitive to humid conditions.

Abstract

Studies on intra-annual dynamics of stem growth provide useful information on tree growth responses to environmental conditions, but are fragmentary for species from Mediterranean Mountain ranges. Lebanon Cedar is a frost and drought tolerant species, growing between 1000 and 2000 m a.s.l in the Taurus Mountains (Turkey). Foresters see it as a potential candidate for plantation in Central European forests facing global warming. To describe the natural variability of Lebanon Cedar growth dynamics, five study sites were established: four along an altitudinal gradient at a natural site in SW-Turkey and one in a Lebanon Cedar plantation in Central Germany. Two stem growth monitoring methods were used: (1) bi-weekly microcoring during 2013 growing season and (2) point dendrometers during 2013 and 2014. Histological analyses were used to calibrate dendrometer records and to describe cambium phenology. Seasonal dynamics of xylem and stem radial increments were modelled by Gompertz functions. Onset of cambial activity was observed 1–2 weeks after stem temperatures reached a threshold of 5 °C but could be delayed by high site-LAI. Cedars growing under better light and water availability showed higher growth rates and wider tree rings. Daily stem radius variations (dSRV) extracted from dendrometer records were negatively related to vapor pressure deficit and global radiation; multiple linear regressions explained 30–52% of dSRV variance being dominated by relative humidity, precipitation, and soil water content. Best growth performance was observed at the German site, likely for a continuous water supply throughout the year, underlining the potential of Lebanon Cedar for Central European Forestry.

Keywords

Lebanon Cedar Point dendrometer Microcoring Cambial activity Tree-ring formation Microclimate 

Abbreviations

A
Final annual tree-ring width
bE
Onset of the enlarging phase
bL
Onset of the cell-wall lignification phase
bM
Onset of the mature phase
CA
Cambial activity
cE
Cessation of the enlarging phase
cL
Cessation of the cell-wall lignification phase
CRF
Cedar Research Forest
d
Time required for major period of tree-ring formation
dE
Duration of the enlarging phase
dL
Duration of the lignification phase
DOY
Day of year
dSRV
Daily stem radius variation
dX
Duration of xylogenesis
EBG
Ecological Botanical Gardens
gR
Global radiation
LAI
Leaf area index
MAT
Mean annual air temperature
Pp
Precipitation
r
Mean tree-ring formation rate (during growth period)
rH
Relative air humidity
RSI
Radial stem increase
ST
Stem temperature
SWC
Soil water content
Ta
Air temperature (Tamean: daily mean, Tamax: daily maximum, and Tamin: daily minimum)
TAP
Total annual precipitation
tp
Time of inflection point
Ts
Soil temperature
VPD
Vapor pressure deficit

Copyright information

© Springer-Verlag Berlin Heidelberg 2016
For further details log on website :
https://link.springer.com/article/10.1007/s00468-016-1492-4

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