Journal of Forest Science, 2004 (vol. 50), issue 4

Seasonal dynamics of the diameter increment of fir (Abies alba Mill.) and beech (Fagus sylvatica L.) in a mixed stand

R. Knott

J. For. Sci., 2004, 50(4):149-160 | DOI: 10.17221/4610-JFS  

In the growing season 2001 changes were studied in the diameter increment of selected sample trees of silver fir and beech in a mixed stand using mechanical girth dendrometers. Within the selected set of trees individual differences were determined both in the dynamics of increment and in its total magnitude. The differences are evident not only between tree species but also within particular species in trees of the same diameter. On the basis of the results of a detailed study of diameter increment dynamics in the course of a year using a non-destructive method by means of mechanical dendrometers and measurements of particular components of microclimate...

Discrimination of vegetation from the background in high resolution colour remote sensed imagery

P. Surový, N.A. Ribeiro, A.C. Oliveira, Ľ. Scheer

J. For. Sci., 2004, 50(4):161-170 | DOI: 10.17221/4611-JFS  

Different transformations of RGB colour space were compared to develop the best method for discrimination of vegetation from the background in open pure cork oak stands in southern Portugal in high-resolution colour imagery. Normalised difference index, i1i2i3 colour space and other indices developed for classic band imagery were recalculated for near infrared imagery and tested. A new method for fully automated thresholding was developed and tested. The newly developed index shows the equal accuracy performance but provides the smallest overestimation error and retains the largest scale of grey levels for a subsequent shape analysis.

Inventory of dead wood in the Kněhyně-Čertův mlýn National Nature Reserve, the Moravian-Silesian Beskids

L. Jankovský, D. Lička, K. Ježek

J. For. Sci., 2004, 50(4):171-180 | DOI: 10.17221/4612-JFS  

In four permanent experimental plots, dead wood was inventory under conditions of mountain forest ecosystems of the Kněhyně-Čertův mlýn National Nature Reserve, the Moravian-Silesian Beskids. Down woody material, standing dead trees as well as living trees were recorded. Data obtained were used to determine partial and summarized volumes of dead wood and its proportion in a living stand. Each of the surveyed areas was described not only from the viewpoint of mensuration but also with respect to subsequently carried out studies of biodiversity of wood mycoflora, succession of decomposition processes, natural regeneration on the dead wood etc. Mean volume...

Financing of forestry from public funds in the Czech Republic, Estonia, Poland and Slovenia - policy context, organisation and supported activities

A. Kaliszewski

J. For. Sci., 2004, 50(4):181-189 | DOI: 10.17221/4613-JFS  

The paper describes the policy, legislative and organisational context and structure of financing the forestry from public funds in the Czech Republic, Estonia, Poland and Slovenia in the 90's. The first half of the nineties was the period of the most significant changes, whereas more stable and systematic financing of forestry was generally started in the second half of the nineties. The supported activities reflected main problems and challenges facing the forestry in individual countries. In the Czech Republic the substantial support was designed for protective measures and restitution of damaged stands. In Poland, the increase of forest area and...

Real potentials of social forest functions of selected forest stands at Židlochovice Forest Enterprise

P. Kupec

J. For. Sci., 2004, 50(4):190-198 | DOI: 10.17221/4614-JFS  

Social functions of forests were evaluated at Židlochovice Forest Enterprise by applying the method of Vyskot et al. (1996-2002). Real potentials of social forest functions were determined for all stand groups included in a forest management plan (FMP). The results of evaluation were processed in a database and projected in GIS. Tables and charts were used for the evaluation of results. We can claim on the basis of the results that the forest stands of the examined area are characterized by a very high potential to fulfil a bio-production social function. On the contrary, they have a low potential to fulfil social functions of ecological stabilization...