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The spatial pattern and microsites requirements of Abies alba natural regeneration in the Karkonosze Mountains

100%

Szymura T. H., Dunajski A., Aman I., Makowski M., Szymura M.

Dendrobiology

2007

tom 58

51-57

Progeny of four adult silver firs, which were an admixture in Norway spruce (Picea abies) stand was, analyzed. The study was done in lower mountain zone of the Karkonosze (Giant Mts.) National Park (SW Poland). The seedlings occurred in two clumps related to the position of adult trees, whereas spatial pattern of the seedlings inside each clump was random. The seedlings were spaced mainly in distances 5–25 from the nearest adult tree. The maximal distance was up to 50 m. Most seedlings were established in accordance with main wind directions. Also, in these directions seedlings were more distant from adult trees than in other directions. The seedlings grew in better light environment (12% of PPFD) than average (9,6% PPFD). This effect was statistically significant. The height increment of the seedlings was low and was not correlated with light conditions. Similarly, there was not any correlation between the apical dominance ratio and light. The lack of this correspondence we attributed to browsing. The silver fir seedlings were significantly underrepresented in patches of Vaccinium myrtillus, on raw needles, under crown of adult trees and in concave micro-relief form. The underrepresentation in the places covered by canopy and in patches of bilberry we related to the indirect effect of continuous browsing, which leads to higher seedlings mortality in more shaded places and sites of stronger competition between forest floor vegetation and silver fir seedlings.

The stand structure and natural regeneration of Abies alba Mill. in reserves on the northern margin of its distribution in SW Poland

100%

Szymura T. H.

Dendrobiology

2007

tom 57

55-62

The silver fir (Abies alba Mill.) in the area of Wał Trzebnicki is at the northern limit of its distribution in western Poland. This study was performed in three nature reserves with protected silver fir populations. The stands in these reserves were mixed, with complex spatial structure and abundant tree regeneration. The proportion of fir in stands was around 16% of DBHS, the age of trees reached around 130 years. The silver fir occurs mainly in the sapling stage, whereas the number of seedlings was very low. The results of this study show the influence of forest floor vegetation as well as litter type on the emergence of fir seedlings. The seedlings density was compared with the results of other studies from different geographical areas and stands type in Poland.

Ograniczanie wyników

2 Dendrobiology

2 Szymura T. H.

1 Aman I.

1 Dunajski A.

1 Makowski M.

1 Szymura M.

2 2007

Wyniki wyszukiwania

The spatial pattern and microsites requirements of Abies alba natural regeneration in the Karkonosze Mountains

The stand structure and natural regeneration of Abies alba Mill. in reserves on the northern margin of its distribution in SW Poland