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2 Acta Agraria et Silvestria. Series Silvestris

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Budowa i struktura lasu lipowego w rezerwacie Obrozyska

100%

Jaworski A. , Kaczmarski J. , Skryszewski J.

Acta Agraria et Silvestria. Series Silvestris

1993

tom 31

57-79

Na podstawie analizy rozkładu pierśnic oraz wysokości, zasobności, składu gatunkowego, masy posuszu i innych cech drzewostanu lipowego w Obrożyskach, scharakteryzowano - na przykładzie 3 powierzchni doświadczalnych - dwa stadia rozwojowe lasu pierwotnego. Podano także skład gatunkowy odnowień. W rezerwacie zwraca uwagę duża zasobność drzewostanów i ich dobra jakość.

The purpose of this study was to determine stand characteristics of common linden (Tilia cordata Mill.) in Obrożyska near Muszyna (Southern Poland) (tab.l). The stand is considered as relict from the Atlantic; period 4000—2000 years B.C. when deciduous stenothermal trees expanded and mixed broadleaved forests appeared [9]. According to Korpel criteria [6] sample plots represent the up-growing stage in transition to the optimum stage with a noticeable ageing phase (Plot 1, 2) and the up-growing stage with a selection phase (Plot 3) (Tab. 1) in some parts. First of all the obtained results show a high stand volume (667—757 cu. m per ha) (Tab. 2) while according to Żyłkin labels [1] the maximum stand volume of pure linden stands on sites of the first stand quality class reaches 455 cu. m per ha. In spite of several generations, different stages, and phases of development, the d.b.h. distribution of linden is compatible with normal d.b.h. distribution on all sample plots (Tab. 3, Fig. 1, 2, 3). The storeyed structure is characteristic for virgin type forests of linden (Plot 1, 2). In selected storeys every generation is found showing horizontal density. Selection structure (selection phase) is formed in the presence of a greater share of shade-resistant species in the stand (like fir and hornbeam) (Plot 3) (Fig. 9). Linden is characterized by a high quality, over 20% of trees reach the highest values. A large share of fir, sycamore, maple in new growth on plot no. 1 and of hornbeam and sycamore on plot no. 2 and 3 can cause concern about the existence of linden (Tab. 6). In the up-growth layer the share of linden is larger and becomes predominant and co-predominant species in this phase of stand development. Analysis of data from 1945 [2] and from 1990 shows that the stand volume has increased from 438 cu. m per ha to 692 cu. m per ha and the share of linden has increased from 63,3% to 90,6% in that period. From the economic point of view the introduction of common linden into stands on suitable forest sites of foothills and lower parts of lower mountain zone not only as a cultivation and biocoenotic but also high productive admixture is advisable though it is currently not realized in practice [2]. Linden is especially recommended for planting under thinned fir stands.

Mozliwosci produkcyjne drzewostanu lipowego w rezerwacie 'Las Lipowy Obrozyska'

86%

Gralek K. , Jaworski A. , Kolodziej Z. , Majerczyk K.

Acta Agraria et Silvestria. Series Silvestris

2009

tom 47

3-26

The aim of this study was to determine the productive potentiality (stand volume, basal area, and their increments) of the natural little leaf linden stand 26.68 ha in area. This stand is a part of the Obrożyska nature reserve of the total forest area of 98.25 ha. Measurements were carried out in 1995 and 2005 on 26 4-are sample plots established according to the statistical-mathematical system of forest inventory and control, and in 1999 and 2000 on three permanent sample plots which represented different developmental stages and phases of the virgin forest. Between 1990 and 2005, the mean volume of the entire stand increased from 538 to 567 m3/ha. In the growing up stage it increased from 554 to 584 m3/ha, while in the optimum stage from 510 to 541 m3/ha. The volume increment in these two stages was 66 and 51 m3/ha/10 years respectively. Volume of the stand representing the growing up stage in transition to the optimum stage (Obrożyska I classical permanent sample plot) increased during the 10-year period from 700 to 768 m3/ha, while in the stand representing the initial phase of the optimum stage (Obrożyska II) it increased from 797 to 861 m3/ha, and in the stand representing the growing up stage (Obrożyska III) from 696 to 761 m3/ha. The volume increment in these three plots was almost 80, 96, and 82 m3/ha/10 years respectively. The stand volume per hectare of the little leaf linden forest in the Obrożyska reserve is one of the highest among stands of natural character in the Polish part of the Carpathians. A very high productive potentiality of the investigated little leaf linden stand permits to accept this tree species as the main species in stands of the submontane zone as well as in the lower part of the lower montane zone in the Poprad river valley and in the climate close to that of the surroundings of the town of Muszyna.