scholarly journals Crown structure and stem growth of Norway spruce undergrowth under varying shading.

Silva Fennica ◽  
1981 ◽  
Vol 15 (3) ◽  
Author(s):  
Ilppo Greis ◽  
Seppo Kellomäki
Keyword(s):  
Norway Spruce ◽  
Stem Growth ◽  
Crown Structure

Seasonally varying relationship between stem respiration, increment and carbon allocation of Norway spruce trees

2020 ◽  
Vol 40 (7) ◽  
pp. 943-955
Author(s):  
Eva Darenova ◽  
Petr Horáček ◽  
Jan Krejza ◽  
Radek Pokorný ◽  
Marian Pavelka
Keyword(s):  
Cell Wall ◽  
Norway Spruce ◽  
Carbon Allocation ◽  
Stem Growth ◽  
Wall Thickening ◽  
Radial Increment ◽  
Stem Respiration ◽  
Energy Demands ◽  
The Relationship ◽  
Stem Radial Increment

Abstract Stem respiration is an important component of an ecosystem’s carbon budget. Beside environmental factors, it depends highly on tree energy demands for stem growth. Determination of the relationship between stem growth and stem respiration would help to reveal the response of stem respiration to changing climate, which is expected to substantially affect tree growth. Common measurement of stem radial increment does not record all aspects of stem growth processes, especially those connected with cell wall thickening; therefore, the relationship between stem respiration and stem radial increment may vary depending on the wood cell growth differentiation phase. This study presents results from measurements of stem respiration and increment carried out for seven growing seasons in a young Norway spruce forest. Moreover, rates of carbon allocation to stems were modeled for these years. Stem respiration was divided into maintenance (Rm) and growth respiration (Rg) based upon the mature tissue method. There was a close relationship between Rg and daily stem radial increment (dSRI), and this relationship differed before and after dSRI seasonal maximum, which was around 19 June. Before this date, Rg increased exponentially with dSRI, while after this date logarithmically. This is a result of later maxima of Rg and its slower decrease when compared with dSRI, which is connected with energy demands for cell wall thickening. Rg reached a maxima at the end of June or in July. The maximum of carbon allocation to stem peaked in late summer, when Rg mostly tended to decrease. The overall contribution of Rg to stem CO2 efflux amounted to 46.9% for the growing period from May to September and 38.2% for the year as a whole. This study shows that further deeper analysis of in situ stem growth and stem respiration dynamics is greatly needed, especially with a focus on wood formation on a cell level.

Models relating stem growth to crown length dynamics: application to loblolly pine and Norway spruce

Trees ◽  
2011 ◽  
Vol 26 (2) ◽  
pp. 469-478 ◽  
Author(s):  
Harry T. Valentine ◽  
Annikki Mäkelä ◽  
Edwin J. Green ◽  
Ralph L. Amateis ◽  
Harri Mäkinen ◽  
...  
Keyword(s):  
Norway Spruce ◽  
Loblolly Pine ◽  
Stem Growth ◽  
Crown Length

scholarly journals Impact of soil drainage to the radial stem growth of Norway spruce (Picea Abies L. Karst.) in peatland forests

2013 ◽  
Vol 59 (4) ◽  
Author(s):  
Barbora Klempířová ◽  
Lukáš Dragoun ◽  
Róbert Marušák
Keyword(s):  
Picea Abies ◽  
Norway Spruce ◽  
Stem Growth ◽  
Soil Drainage

scholarly journals Evaluation of stand-level hybrid PipeQual model with permanent sample plot data of Norway spruce

2017 ◽  
Vol 47 (2) ◽  
pp. 234-245 ◽  
Author(s):  
Tuomo Kalliokoski ◽  
Harri Mäkinen ◽  
Tapio Linkosalo ◽  
Annikki Mäkelä
Keyword(s):  
Norway Spruce ◽  
Basal Area ◽  
Forest Growth ◽  
Stem Volume ◽  
Permanent Sample Plots ◽  
Crown Structure ◽  
Permanent Sample Plot ◽  
Crown Characteristics ◽  
Linear Regressions ◽  
Process Based Models

The evaluation of process-based models (PBM) includes ascertaining their ability to produce results consistent with forest growth in the past. In this study, we parameterized and evaluated the hybrid model PipeQual with datasets containing traditional mensuration variables collected from permanent sample plots (PSP) of even-aged Norway spruce (Picea abies (L.) Karst.) stands in Finland. To initialize the model in the middle of stand development and reproduce observed changes in Norway spruce crown structure, the built-in empirical relationships of crown characteristics were made explicitly dependent on the light environment. After these modifications, the model accuracy at the whole dataset level was high, with slope values of linear regressions between the observations and simulations ranging from 0.77 to 0.99 depending on the variable. The average bias ranged between −0.72 and 0.07 m in stand dominant height, –0.68 and 0.57 cm in stand mean diameter, –2.62 and 1.92 m2 in stand basal area, and 20 and 29 m3 in stand total stem volume. Stand dynamics after thinning also followed reasonable closely the observed patterns. Accurate predictions illustrate the potential of the model for predicting forest stand growth and forest management effects in changing environmental conditions.

scholarly journals Norway spruce (Picea abies/L./Karst.) health status on various forest soil ecological series in Silesian Beskids obtained by grid or selective survey

Beskydy ◽  
2017 ◽  
Vol 10 (1-2) ◽  
pp. 57-66
Author(s):  
Pavel Samec ◽  
Magda Edwards-Jonášová ◽  
Pavel Cudlín
Keyword(s):  
Health Status ◽  
Picea Abies ◽  
Norway Spruce ◽  
Survey Design ◽  
Forest Health ◽  
Site Conditions ◽  
Ecological Site ◽  
Crown Structure ◽  
Survey Designs ◽  
Total Damage

The values of characteristics of forest health status (FHS) depend on design of monitoring plot selection. The aim of the work was to compare the dependence of FHS on various ecological site conditions on research plots with different selection designs. The differences of Norway spruce (Picea abies/L./Karst.) defoliation, discoloration and total damage variance were investigated in the Silesian Beskids (Czech Republic; 297 km2; 304–1067 m a. s.l.) during 1999–2008. FHS results on 187 plots at 400×400 m grid were obtained through routine methods according to EMEP-LRTAP. In addition, forest health status on 18 plots of selective survey design was obtained by estimation of defoliation and crown structure transformation. The comparison of ecological series proportion in individual survey designs was carried out through Mann-Whitney U-test, the comparison of health status feature occurrence in ecological series between different survey designs through analysis of variance. The survey design did not influence ecological series proportion, but influenced FHS feature variance. FHS features on sites of various ecological series have different rate of tree damage in individual survey designs. The selective survey significantly decreased data variance in contrast to low plot frequency.

Mycorrhiza formation on Norway spruce (Picea abies) roots affects the pathway of anaplerotic CO2 fixation

1996 ◽  
Vol 96 (4) ◽  
pp. 699-705 ◽  
Author(s):  
Astrid Wingler ◽  
Thomas Wallenda ◽  
Rudiger Hampp
Keyword(s):  
Picea Abies ◽  
Norway Spruce ◽  
Co2 Fixation ◽  
Mycorrhiza Formation
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