Journal of Forest Science, 2002 (vol. 48), issue 4

Natural loss of trees, recruitment and increment in stands of primeval character in selected areas of the Bieszczady Mountains National Park (South-Eastern Poland)Original Paper

A. Jaworski, Zb. Kołodziej

J. For. Sci., 2002, 48(4):141-149 | DOI: 10.17221/11867-JFS  

In three investigated stands the highest increment (8.8 m3/ha per year, i.e. 1.5% of the actual stand volume, measured at the end of the control period) was reached by Jawornik I stand in the initial period of the growing up stage, and Tworylczyk stand in the advanced growing up stage (7.4 m3/ha per year, i.e. 1.2% of the actual stand volume). Jawornik II stand, in the optimum stage, the aging phase, had the lowest increment (3.9 m3/ha per year, i.e. 0.7% of the actual stand volume). The process of a natural volume loss was the most intensive in Tworylczyk stand (7.6 m3/ha per year), a little less intensive in Jawornik II stand (7.1 m3/ha per year),...

Point distribution form model for spruce stems (Picea abies [L.] Karst.)Original Paper

M. Křepela

J. For. Sci., 2002, 48(4):150-155 | DOI: 10.17221/11868-JFS  

The paper deals with the construction of a point distribution form model for spruce stems. This model is based on the principal components analysis of variance-covariance matrix formed for the Procrustes residuals. The calculation of full Procrustes co-ordinates, the principal components, is demonstrated on an example of a spruce experimental plot at premature age, and a point distribution model is constructed for the first three components. The parameters of the model are evaluated in relation to Konšel's (Kraft's) tree classes, normality of their classification is tested, maxima and minima are demonstrated on actual trees. The complete stem shape...

Inventory of plant material in forest nurseries by combining an ocular estimate and sampling measurementsOriginal Paper

Ľ. Šmelková

J. For. Sci., 2002, 48(4):156-165 | DOI: 10.17221/11869-JFS  

Two procedures of the plant material inventories in forest nurseries, used until now, are evaluated: ocular estimate and sampling. A new two-phase sampling procedure has been proposed on the basis of a suitable combination of estimation and counting and/or measurement of seedlings and plants. The optimum size of the sampling unit (length of bed segment) has been defined. The necessary number of bed segments on which the ocular estimation should be performed in the first phase (n1), and subsequently a more exact assessment of the number of individuals and/or their other qualitative and quantitative traits should be done in the second phase...

Effect of soil drought on evapotranspiration of a young spruce forestOriginal Paper

F. Matejka, J. Rožnovský, T. Hurtalová, D. Janouš

J. For. Sci., 2002, 48(4):166-172 | DOI: 10.17221/11871-JFS  

Daily courses of the actual transpiration of a forest stand were determined by an experimentally verified mathematical Soil - Vegetation - Atmosphere Transfer model. The results refer to the Norway spruce (Picea abies [L.] Karst.) monoculture situated in the highest locations of the Beskids Mts. Drought-free transpiration was estimated as a model simulation run for nonlimiting soil moisture exceeding the level of decreased availability of water. Drought-induced reduction in transpiration was quantified as a difference between actual transpiration and simulated transpiration for moist soil. The results led to conclusions that dry soil causes...

Use of selected allowable cut indicators in near-natural forest managementOriginal Paper

R. Marušák, A. Žíhlavník

J. For. Sci., 2002, 48(4):173-184 | DOI: 10.17221/11872-JFS  

The objective of this paper is to evaluate the possibilities of using selected allowable cut indicators in near-natural forest management by supplementing two indicators to present allowable cut indicators. Namely it is 1/30 of forest stand growing stock of the last three age classes and higher and 1/40 of forest stand growing stock of the last four age classes and higher. These indicators are compared with the allowable cut indicator 1/20 of forest stand growing stock of the last two age classes and higher which in relation to the forest law can be used in the present control of cuttings. The evaluations were carried out at selected five forest user's...