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National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
Natural regeneration of Norway spruce in mountain forests and at disturbed plots
 Urbanová, Renáta ; Hadincová, Věroslava (advisor) ; Brůna, Josef (referee)
The natural regeneration of Picea abies in undisturbed mountain spruce forests as well as in disturbed areas formed by windstorms and overgrowth of bark beetles, especially spruce bark beetle (Ips typographus), takes place primarily through seed germination from a transitional soil seed bank. The quality of the soil seed bank depends on the amount of seeds available, which varies significantly throughout years, and on environment conditions. Interannual changes in the amount of seeds produced are caused by the irregular occurrence of seed years, which reflects weather changes in the context of ongoing climate change. Increased average air temperature and unevenly distributed rainfalls throughout the year have a positive effect on the spruce phenology, seed abundance and quality and results in increasing frequency of seed years. The large amount of seeds during seed years induces increased abundance of granivores for which the seeds are the source of nutrients and environment for their development. Seed predators of invertebrates and, small vertebrates groups and fungal pathogens significantly reduce the proportion of seeds needed for spruce natural regeneration. This bachelor thesis summarizes up to now knowledge explaining mechanisms and interactions associated with the soil seed bank of Picea...
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The Norway spruce seedlings establishment and survival in the climax forests in the Krkonoše Mts
 Vávrová, E. ; Cudlín, Pavel ; Polák, T. ; Šerá, Božena ; Chmelíková, Ewa ; Falta, V.
In years 1995-2002, the response of the Norway spruce climax forest to multiple stress s was monitored on four permanent research plots in the Krkonoše Mt. Stress impacts influenced the defoliation, regenerative potencial of the asimilative organs and root system and development of the mycorrhizal symbioses. The seed production, germination ad seedling survival are closely connected with forest stand health status and they are the main prerequisite for the natural recovery of these forest stands.
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