SILVA GABRETA 11 (1)

Miroslav Svoboda

Struktura horského smrkového lesa v oblasti Trojmezné ve vztahu k historickému vývoji a stanovištním podmínkám
Structure of the mountain spruce forest in the area of Trojmezná Mt. related to the historical development and site conditions

Abstract

Close to natural mountain spruce forest at Trojmezná Mt. belongs to the most valuable forests in the Šumava National Park, Czech Republic. According to the historical records, some stands have not been managed in the last 300 years, while some parts were cut 150 years ago. The main goal of this study was to describe the structure of the forest and compare structure of old-growth parts with stands that were cut. We analyzed series of plots established on three altitudinal transects (T1–T3), spanning from 1240 (plot 1) to 1320 (plot 6) m a.s.l., near the mountain ridge. These transects intersect stands with different history of management which ceased in different periods. The plots were grouped in pairs A, B, C, from the lower to the higher altitudes respectively. Using preliminary data just from transect T2, high age range was found on every plot, except T2/5. The maximum age reaches 350 years on plot T2/2 and is higher than 200 years on each plot. The altitude and probably the site conditions are the most important factors forming stand structure. The number of trees and maximum height of trees were significantly dependent on the altitude. While with the altitude the number of trees increases, the maximum height of trees declines. The distribution of maximum DBH is more varying. Trees with DBH >40 cm were found on every plot, trees with DBH >70 cm were found mostly on plots A and almost none was present on plots C. We have found different stages of stand development for plots A (the decay stage), while plots C are in optimal stage. Using the results of this study, mutual influence of the historical development as well as changes in climate and site conditions probably produce differences in forest structure on study plots.

Key words:
Šumava NP, forest, phase development, old-growth forests, stand structure, stand composition, Norway spruce

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