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Równania regresji grubości kory na wysokości 1,30 m dla drzewostanów sosnowych

100%

Meixner J.

1988

tom 23

Modelowanie grubości kory wzdłuż pnia za pomocą modeli zbieżystości

86%

Bronisz K. , Gruchala A. , Zasada M.

nr 06

Taper models are used to determine the diameter along the trunk and allow to determine the tree trunk volume or volume of any part of it. The paper presents the method of determining the thickness of bark along the trunk using compatible taper models. Four taper models with different levels of complexity were analyzed based on data from 13 sample plots and 39 sample trees measured in black locust (Robinia pseudoacacia L.) stands from west Poland. For modelling the over and under bark diameter and bark thickness along the trunk seemingly unrelated regression of independent equations was applied. During the analyzes, the logical assumption that the thickness of the bark at any place on the trunk is determined in a difference of over and under bark diameter was applied. It was found that selected models fit the shape of the trunk with different accuracy. The worst results were obtained with the use of a polynomial model. The best fit for modelling bark thickness along the trunk was characterized by variable−form taper models. However, regardless of the complexity and quality of fit to the trunk shape, all analyzed models allowed determining the bark thickness along the trunk without systematic error and with practically acceptable accuracy.

Bark thickness of larches of various Polish provenances in an experimantal area of the Forest Experimental Station in Krynica

86%

Orzel S. , Kulej M.

tom 41

25-35

Wstepna dendrometryczna charakterystyka wybranych cech sosny zwyczajnej na proweniencyjnej powierzchni doswiadczalnej w Polanach k. Grybowa

51%

Orzel S. , Sabor J.

1994

tom 32

37-44

W pracy stwierdzono istotny wpływ pochodzenia sosny na wysokość drzew oraz grubość odkładanej kory. Badania nie wykazały natomiast istotnego wpływu pochodzenia na wielkość pierśnicy i miąższość strzał bez kory w badanej populacji sosen.

The purpose of this study was to present the biometric description od 16 native proveniences of 28-year-old Pinus silvestris growing in the V-th block of the provenience experiment area in Polany near Grybów. Such dendrometrie characters of trees as d.b.h. (d), height (A), bark thickness at the height of 1.3 m (k), and volume of stems without bark (v) were taken into account. It was concluded that the variability of characters under investigations did not differ basically from that reported in literature for forest stands of similar age (tub 1). The provenience was significantly important in case to height and bark thickness (tab. 2, fig, 1 and 2), and on the other hand had no effect on d.b.h. and volume of stems without bark. The pine originating from Gubin was characterized by lowest values of all characters studied, while the highest values were reached by the following proveniences: Karsko, Dłużek, Rozpuda and Lipowa (tab. 1, fig. 1). The existence of significant interproveniencial differences in pine bark thickness may play an important diagnostic role in the distinguishing the individual proveniences. The determination of the variability of this character may be of significant importance in the silvicultural appraisal оf Scotch pine populations in the mountain areas.