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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Geographical characteristics of extreme growth depressions of Scots pine in Central Europe
 Mík, Milan ; Treml, Václav (advisor) ; Rybníček, Michal (referee)
The presented diploma thesis studies extreme growth depressions of Scots pine (Pinus sylvestris L.) in Central Europe. Examination of significant growth anomalies (pointer year analysis) is one of the methods, which investigates the reactions of forest stands to the ongoing climate change. Dendrochronological data was obtained from Czechia (23 sites) and Slovakia (4 sites). The main hypotheses of the thesis states that the extreme growth depressions relate to climatic anomalies, hence they can be explained geographically. The objectives were to 1) create a Cropper values chronology for each site which describes growth extreme depressions; 2) explain climatic causes of negative Cropper values for each site; 3) define geographical predispositions of a spatial distribution of extreme growth depressions; 4) spatially interpolate extreme growth depressions. The calculation of Cropper values was based on a normalisation in a moving window method with a 13-year window size and the input data detrended by a 50-year cubic smoothing spline. Created chronologies were correlated with monthly climate data (temperatures, precipitation, SPEI). Geographical predispositions of the spatial distribution of growth depressions were calculated using a hierarchical cluster analysis. The cluster analysis was also applied...
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Dendrochronology of representative autochtonnous tree species on environmental and temporal gradients
 ČEJKOVÁ, Alžběta
This thesis is focused on application methods of dendrochronology on various ecological and historical aspects of forest communities, human management practices, and historical utilization of wood. Studies revealed growth responses of trees in various type of forest vegetation represented by spruce forest, alder carr and alluvial forests and involved autochthonous tree species with all morphological types of wood. These works demonstrated necessity of dynamic evolving of the regional chronologies for the Czech Republic.
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