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Budowa i struktura drzewostanów w rezerwacie "Łabowiec"

100%

Jaworski A. , Kopec L.

Acta Agraria et Silvestria. Series Silvestris

1988

tom 27

Dynamika, budowa i struktura drzewostanow w rezerwacie Labowiec

100%

Jaworski A. , Karczmarski J. , Skrzyszewski J.

Acta Agraria et Silvestria. Series Silvestris

1994

tom 32

3-26

Praca zawiera charakterystykę zmian wybranych cech, dotyczących m.in. budowy, struktury i składu gatunkowego drzewostanów w rezerwacie „Łabowiec", w latach 1980-1990. Вadania oparto na analizie danych zebranych na 15 poletkach próbnych, rozmieszczonych według zasad inwentaryzacji statystyczno-matematycznej, i na 2 klasycznych powierzchniach doświadczalnych, usytuowanych w charakterystycznych fragmentach rezerwatu.

This paper describes the changes in the chosen stand characteristics which took place in the forest reserve „Łabowiec" (Western Carpathians - Beskid Sądecki) during 1980-1990. The reserve is situated at the elevation of 840-960 m above sea level, and Dentario glandulosae - Fagetum is the plant association which has developed there. The study was based on the analysis of the data collected in 15 sample plots, 0.05 ha each, distributed according to the rules of the statistical and mathematical inventory, and in 2 classical experimental areas (area I - 0.75 ha and area II - 0.70 ha) situated in the characteristic fragments of the reserve. Stands in the optimum stage of development occupy 40% of the reserve area, those in the growing up stage 33%, and in the disintegration stage 27%. The investigated stand development stages differ from one another with respect to stand volume, tree loss, ingrowth, and volume increment (tab. 2). The reserve fragment with high (ir percentage in their species composition were characterized by greater stand volume and increment. The mean stand volume calculated on the basis of the sample obtained from 15 circular plots considerably increased during the investigated decade, from 454 to 492 cu. m per ha. The current volume increment was high and it amounted to 11.0 cu. in per ha per year (tab. 2). The study carried out in the classical areas showed that in the reserve section (area 1) characterized by a high fir percentage in its species composition (41.8% in 1980, and 27.2% in 1990), in spite оf the advanced senescent stage, the stand volume was relatively high, and it amounted to 666 cu. in per ha in 1990 (671 cu. m per ha in 1980) (tab. 5), The stand in the growing up stage (area II) with small percentage of fir (9.2% in 1980 and 7.5% in 1990) was characterized by a relatively low volume (469 cu. m per ha in 1980 and 489 cu. m per ha in 1990) (tab. 5). The greatest changes in the species composition occurred in the area 1 (lab. 5 and 6). In those fragments of the reserve where fir formed an admixture (area 11) its percentage slightly decreased from 4.2% to 7.5%, while the percentage of beech increased from 90,8% to 92,5% (tab. 5). The data obtained in the circular plots indicated no changes in the species composition determined by volume. On the other hand, there was a change in the species composition determined on the basis of the number of trees (tab. 2). The maintenance of the same volume percentage of fir in the stand species composition over the decade, in spite of the decreasing number of trees, indicated that the increment of fir trees which survived over that period of time compensated for a considerable loss in the number of trees and a very small ingrowth. The fir as well as beech reached a highest index of stand quality class - I. The d.b.h. distribution of all trees in area I changed during the 10-year-period from Pearson's type I to type I (J), while in area 11 the type I (U) was maintained (tab. 7). The d.b.h. distribution in the circular sample plots changed in case of 11 plots, while in 4 plots the type present in 1980 was maintained for the next 10 years (tab. I, fig. 1-5). The tree height distribution in area I and II maintained the normal distribution in case of all tree species together (tab. 8). The tree height distribution in the circular sample plots representing the optimum and the destruction stage maintained the normal distribution during the 10-year-period, while in the growing up stage the type changed from I (U) to I (J) (tab. 1). Fir dominated among the dead trees (tab. 3). The analysis of the species composition of the regeneration indicated a very negative tendency towards decreasing the percentage of fir (tab. 4). It should however be added that the upgrowth was almost completely damaged by deer browsing and bark scraping, and the young natural reproduction by browsing. The fir mortality, very small ingrowth and the decrease in fir percentage in the species composition of the regeneration may bring about a complete elimination of fir from the reserve, and formation of beech stands. This tendency has also been observed in other parts of Carpathians.

Szlakiem hrabiego

100%

Plaza M.

Trybuna Leśnika

2011

nr 01

Rezerwat Labowiec

63%

Jachym M.

Las Polski

1997

nr 01