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Statements

Subject Item
n2:RIV%2F62156489%3A43410%2F14%3A00211109%21RIV15-MSM-43410___
rdf:type
skos:Concept n17:Vysledek
dcterms:description
Trees must respond to many environmental factors during their development, and light is one of the main stimuli regulating tree growth. Thinning of forest stands by selective tree removal is a common tool in forest management that increases light intensity. However, morphological and anatomical adaptations of individual shoots to the new environmental conditions created by thinning are still poorly understood. In this study, we evaluated shoot morphology (shoot length, needle number, projected leaf area) and anatomy (tracheid lumen area, tracheid number, tracheid dimensions, xylem area, potential hydraulic conductivity) in three Norway spruce (Picea abies/L./Karst.) families exposed to different thinning regimes. We compared shoot characteristics of uppercanopy (i.e. sun-exposed) and lower-canopy (i.e. shaded) current-year shoots in a control plot and a plot thinned to 50 % stand density the previous year. One tree per family was chosen in each treatment, and five shoots were taken per canopy position. We found that upper-canopy shoots in both plots had higher values than lower-canopy shoots for all studied parameters, except lumen roundness and tracheid frequency (i.e. tracheid number per xylem area). Thinning had little effect on shoot morphology and anatomy 1 year after thinning, except for small but significant changes in tracheid dimensions. Needles were more sensitive to altered light conditions, as projected leaf area of shoot, needle number and leaf hydraulic conductivity changed after thinning. Differences between upper- and lower-canopy shoots did not seem to be influenced by thinning and were almost the same in both plots. Our results suggest that lower-canopy shoots require several years to modify their morphology and anatomy to new light conditions following thinning. Trees must respond to many environmental factors during their development, and light is one of the main stimuli regulating tree growth. Thinning of forest stands by selective tree removal is a common tool in forest management that increases light intensity. However, morphological and anatomical adaptations of individual shoots to the new environmental conditions created by thinning are still poorly understood. In this study, we evaluated shoot morphology (shoot length, needle number, projected leaf area) and anatomy (tracheid lumen area, tracheid number, tracheid dimensions, xylem area, potential hydraulic conductivity) in three Norway spruce (Picea abies/L./Karst.) families exposed to different thinning regimes. We compared shoot characteristics of uppercanopy (i.e. sun-exposed) and lower-canopy (i.e. shaded) current-year shoots in a control plot and a plot thinned to 50 % stand density the previous year. One tree per family was chosen in each treatment, and five shoots were taken per canopy position. We found that upper-canopy shoots in both plots had higher values than lower-canopy shoots for all studied parameters, except lumen roundness and tracheid frequency (i.e. tracheid number per xylem area). Thinning had little effect on shoot morphology and anatomy 1 year after thinning, except for small but significant changes in tracheid dimensions. Needles were more sensitive to altered light conditions, as projected leaf area of shoot, needle number and leaf hydraulic conductivity changed after thinning. Differences between upper- and lower-canopy shoots did not seem to be influenced by thinning and were almost the same in both plots. Our results suggest that lower-canopy shoots require several years to modify their morphology and anatomy to new light conditions following thinning.
dcterms:title
Altered light conditions following thinning affect xylem structure and potential hydraulic conductivity of Norway spruce shoots Altered light conditions following thinning affect xylem structure and potential hydraulic conductivity of Norway spruce shoots
skos:prefLabel
Altered light conditions following thinning affect xylem structure and potential hydraulic conductivity of Norway spruce shoots Altered light conditions following thinning affect xylem structure and potential hydraulic conductivity of Norway spruce shoots
skos:notation
RIV/62156489:43410/14:00211109!RIV15-MSM-43410___
n3:aktivita
n9:P
n3:aktivity
P(EE2.3.20.0265)
n3:cisloPeriodika
1
n3:dodaniDat
n4:2015
n3:domaciTvurceVysledku
n8:6529208 n8:1943111 n8:1598481
n3:druhVysledku
n11:J
n3:duvernostUdaju
n5:S
n3:entitaPredkladatele
n13:predkladatel
n3:idSjednocenehoVysledku
2245
n3:idVysledku
RIV/62156489:43410/14:00211109
n3:jazykVysledku
n15:eng
n3:klicovaSlova
shade shoot; anatomy; sun shoot
n3:klicoveSlovo
n6:anatomy n6:shade%20shoot n6:sun%20shoot
n3:kodStatuVydavatele
DE - Spolková republika Německo
n3:kontrolniKodProRIV
[EB01A15E9A8D]
n3:nazevZdroje
European Journal of Forest Research
n3:obor
n19:GK
n3:pocetDomacichTvurcuVysledku
3
n3:pocetTvurcuVysledku
7
n3:projekt
n14:EE2.3.20.0265
n3:rokUplatneniVysledku
n4:2014
n3:svazekPeriodika
133
n3:tvurceVysledku
Gebauer, Roman Urban, Josef Volařík, Daniel Krokene, Paal Borja, Isabella Eldhuset, Toril Nagy, Nina
n3:wos
329231900011
s:issn
1612-4669
s:numberOfPages
10
n18:doi
10.1007/s10342-013-0747-5
n16:organizacniJednotka
43410