|
|
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.
|
|
|
The role of wood decay fungi in the dynamics of a mountain spruce forest
POUSKA, Václav
This thesis is focused on environmental preferences of wood-decaying fungi and their relationships with forest structure and development. Relationships of fungi to properties of wood and forest stands were studied on the basis of field observations in Central-European mountain spruce forests. Plot-based approach was used to reveal a general pattern in the diversity of fungi within a single forest stand and between different stands. The analysis of stand structure provided a background for plot-based approach. Substrate-based approach was used to study single species preferences and their communities. In addition, the influence of wood properties (including fungi and their rots) on the regeneration of spruce on logs was studied.
|
|
|
Water-use effeciency-different computation strategies
Slípková, Romana
Water use efficiency (WUE) of the plants can be expressed as a ratio weight of biomass increment and consumed water. Two Norway spruce (Picea abies (L.) Karst) in density 1820 individuals ha-1 (FS) and 2440 individuals ha-1 (FD) in Bílý Kříž study site were studied during growing season 2003. WUE (g l-1) in this study was calculated as a ratio of total aboveground biomass increment (TB) defined by two approaches and stand transpiration. TB was defined by (i) one allometric relationship of diameter of the trunk in breast height and total aboveground biomass and (ii) as a sum of increment of stem, branch and leaves biomass allometrically obtained separately. Resulted WUE was marked as WUEI and WUEII. Mean WUEI was in FS 6,5 g l-1 and FD 14,0 g l-1; in case of WUEII FS 4,9 g.l-1 and FD 10,1 g.l-1, any difference was not significant. TBI was significantly higher than TBII in FD. We recommend WUEII approach for long term WUE evaluation.
Fulltext: content.csg -  PDF
Plný tet: Slípková_SylvaNet WoodNet 2010 - PDF
|
|
|
Does ligninolytic enzyme activity depend on phenolics content during the litter decomposition?
APPLOVÁ, Markéta
The aim of the study was to determine the influence of phenolics content and inoculation with soil extract on microbial respiration, on the phenoloxidase (PhOx), peroxidase (PerOx) and newly Mn-peroxidase (MnP) activity in two dominating litter samples (Calamagrostis villosa and Picea abies) differing in phenolics content from Plešné and Čertovo lake watersheds. At PhOx and PerOx activity, the dependence on incubation temperature with L-DOPA was estimated. PhOx and MnP activities significantly increased with higher content of hardly decomposable phenolics, but decreased with water extractable phenolics content. Inoculation with soil extract had no influence on microbial respiration, enzyme activity, nor on decomposition of phenolics. Microbial respiration was significantly higher at 10°C, but average enzyme activity was comparable at 0 and 10°C. PhOx activities had temperature optimum higher than 22°C, while PerOx activities had temperature optimum at 0 - 15°C.
|
|
| |
|
| |
|
| |
|
| |
|
| |
|
| |
guest ::
