Journal of Forest Science, 2003 (vol. 49), issue 7
Forest ecosystems of the Šumava Mts. and their management
S. Vacek, V.V. Podrázský
J. For. Sci., 2003, 49(7):291-301 | DOI: 10.17221/4703-JFS 
The introductory presentation summarizes natural conditions of the area of interest, state of local forest ecosystems and consequent management rules in this National Park and Protected Landscape Area. It describes area delimitation, natural conditions (geology, geomorphology, hydrology and climat, soils, vegetation, forest stands, their dynamics, healthy status). All these syntheses are a basis for forest management and forestry in this region, respecting forest state and forestry aims, as well as the nature protection targets.
Biological activity, nitrogen dynamics, and chemical characteristics of forest soils in the Šumava national park
M. Svoboda
J. For. Sci., 2003, 49(7):302-312 | DOI: 10.17221/4704-JFS
This paper deals with large-scale mountain forest decline in the Šumava National Park. The changes in biotic and abiotic properties of forest sites follow the tree layer disintegration. Changed microclimatic conditions such as intensity of irradiance, moisture and temperature of the top holorganic layers together with altered development of ground vegetation could strongly affect the values of microbiological respiration activity and the rates of nitrogen mineralization and nitrification. Soil substrates, built of organic mater, located on stony locations, are endangered by introskeletal erosion. This paper compares these features in pairs of research...
Introskeletal erosion threat in mountain forests of the Czech Republic
S. Vacek, V.V. Podrázský, M. Mikeska, W.K. Moser
J. For. Sci., 2003, 49(7):313-320 | DOI: 10.17221/4705-JFS
Summarization of the potential of introskeletal erosion (ISE) was done on the basis of field surveys in the Šumava Mts., Krkonoše Mts. and Jeseníky Mts. areas. The results give a rough estimation of the ISE extent in mountain forests of the Czech Republic. They indicate that in the mountainous areas of the Czech Republic there are 46,535 ha of forest lands endangered by these processes, which represents 10.1% of mountain forests and 1.7% of the total forest area in the country. The worst situation is in the Krkonoše Mts., where the considerable ISE potential is on 30.5% of forest area (in the Jeseníky Mts. 16.6%, in the Novohradské hory Mts. 13.3%,...
Effect of fertilisation on Norway spruce needles
V.V. Podrázský, S. Vacek, I. Ulbrichová
J. For. Sci., 2003, 49(7):321-326 | DOI: 10.17221/4706-JFS
Yellowing of Norway spruce is a relatively common problem in many regions of the Czech Republic. At some places, it is also connected with forest decline. This unfavourable phenomenon is initiated by several ecological as well as anthropogenic processes. One of the most important is the imbalance of forest stand nutrition. Particular reasons lead to nutrient deficiency, especially deficiency of magnesium. Solution to this undesirable trend is a profound ecological analysis and cause-oriented treatments. Besides decreasing air pollution impacts, fertilisation with deficient nutrients represents a successful treatment in the forest stand management in...
Mountain Norway spruce forests: Needle supply and its nutrient content
M. Kovářová, S. Vacek
J. For. Sci., 2003, 49(7):327-332 | DOI: 10.17221/4707-JFS
Soon after bark-beetle attack as well as after clear cutting, grown-up mountain Norway spruce forest cast the following mass of needles: 50-60 kg of dry matter per tree, or 18-20 tons per hectare, containing 8,800-10,000 kg/ha of carbon, 190 to 250 kg/ha of nitrogen, 13-16 kg/ha of phosphorus, 65-91 kg/ha of calcium, 9-13 kg/ha of magnesium and 56-67 kg/ha of potassium. These values were obtained by application of equations assessing needle mass from measured tree and plot parameters, and from chemical analyses of two types of needle material (from living and dead trees).
Dynamics of health status of forest stands on research plots in the Šumava National Park
S. Vacek, K. Matějka, J. Mayová, V.V. Podrázský
J. For. Sci., 2003, 49(7):333-347 | DOI: 10.17221/4708-JFS
The paper summarises an evaluation of the health status dynamics of allochthonous spruce stands in the Modrava Forest District and of natural stands in the Plešný Forest District. Analysis is based on dendroecological reactions of particular tree individuals in the stand structure. The tree damage was evaluated annually (during the period 1997-2002), based especially on defoliation. Natural and semi-natural, especially mixed forest stands with dominant beech in the Plešný Forest District territory were most tolerant, allochthonous secondary spruce stands in the Modrava Forest District area were least tolerant. The damage dynamics was limited by the...