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Volume increment indices of 5-year increment periods and their variability in the 86-year old pine stand

100%

Turski M.

nr 1

Assessment of accuracy of 'Volume increment tables for pine' by Albert Dudek in pine stands of thje Murowana Goslina Forestry Experimental Station

100%

Turski M.

nr 2

Dynamika przyrostu grubosci drzewostanow sosnowych w rejonie elektrocieplowni Polaniec

59%

Orzel S.

1994

tom 32

45-51

W pracy wykazano, że dynamika przyrostu grubości zależy od wieku drzewostanu, a nie od liczby drzew w drzewostanie ani też warunków siedliskowych. Przed uruchomieniem elektrociepłowni drzewostany z rejonu Połańca charakteryzowały się dynamiką podobną do kontrolnych. W pierwszym 10-leciu jej działalności nastąpiło wyraźne zahamowanie ich przyrostu grubości, a oszacowane straty wynoszą średnio 21,1%.

The purpose оf this study was to determine the diameter increment dynamics of Scotch pine stund к growing in the theoretical range of the industrial emissions of the Połaniec thermal-electric power station. The study material was colluded in 45 forest stands (tab. 1), while the comparative material originated from the Wyszków forest management unit, i.e. the area free of the industrial pollution. The diameter increment dynamics was expressed by the quotient of the diameter increment in a given 10-year period to d.b.h without bark at the beginning of the period. The dynamics index was calculated for the period 1967-1976 (W1) and 1977-1986 (W2). It was concluded that value of this index depends on stand's age, and not on the number оf trees in the stand or site conditions (tab. 2, fig. I, 2 and 3), During 1967-1976 the diameter increment dynamics in stands near the Połaniec thermal-electric power station was similar to that observed in the control stands (fig, 4a), A distinct slowing down of the diameter growth was observed during the first decade of the power station's activity (fig. 4b). Estimated losses in the diameter increment dynamics amounting to 21,1% on the average (fig. 4e) indicate a negative effect of the industrial pollution caused by the Połaniec station on the diameter increment of forest stands growing within its reach.

Wplyw spalowania powodowanego przez jelenie na przyrost wysokosci i miazszosci jodel [Abies alba Mill.]

51%

Pach M.

tom 42

35-48

The paper presents the results of studies carried out in the Forest Experimental Station in Krynica (Beskid Sądecki Mts,, Southern Poland), where the influence of bark-stripping on height and volume increment of silver fir was analyzed on the sample plots established in stands with fir share. On the basis on measurements done in the field and on discs cut from wounded and uninjured trees, stem analyses of firs were performed. Average decrease of height and volume increment of all studied damaged trees amounted respectively 12% and 6% of the last increment before bark stripping. The comparison of height and volume increment of wounded and unwounded fir trees pointed at existence of statistically significant differences. The decrease of height and volume increment in the first year after injury, which was determined respectively on 62% and 58% wounded trees, was not affected by the dimensions of wounds and their locations on tree trunks. Only the average value of volume increment in the first three and five years after injury depended significantly on the length of wound and its location on tree trunk.