Journal of Forest Science, 2006 (vol. 52), issue 10

Logging and forest decline effects on the surface humus horizons in the Šumava Mts.

V. Podrázský

J. For. Sci., 2006, 52(10):439-445 | DOI: 10.17221/4524-JFS  

Holorganic layers belong among the key ecosystem components of forest soils at higher altitudes. Increased biological activity of the surface humus is very often observed after forest decline and/or forest cut and removal at these sites. The forest removal or tree layer extinction was studied in the flat, water affected terrain: its effects on the soil chemical characteristics and on the soil respiration, ammonification and nitrification activities. The standard methods of analyses were used. The study proved the increased intensity of nitrification and ammonification in stands with decreased ecological as well as environmental function potentials,...

Development of the spruce natural regeneration on mountain sites in the Šumava Mts.

I. Ulbrichová, J. Remeš, D. Zahradník

J. For. Sci., 2006, 52(10):446-456 | DOI: 10.17221/4526-JFS  

The aim of this study was the evaluation of the spruce natural regeneration growth and development in Modrava and Plechý areas, which represent the first and late bark beetle attack areas. Study was done on 13 permanent research plots, partly with vital tree layer and canopy cover and partly characteristic by open or none canopy, due to bark beetle attack. Actually amount of this regeneration is sufficient (average over 12,000 pcs/ha in the living stands and almost half of this amount in the declined stands) on the both types of plots. Faster growth is usually on the declined plots, with saplings larger amount and height increments, in the higher height...

Dynamics of the health status of forest stands and its prediction on research plots in the Šumava Mts.

S. Vacek, V. Podrázský, K. Matějka

J. For. Sci., 2006, 52(10):457-473 | DOI: 10.17221/4527-JFS  

The paper summarises the 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 texture. The tree damage was evaluated annually (in the period 1997-2005), based especially on defoliation. The most tolerant were the natural and semi-natural, especially mixed forest stands with dominant beech in the Plešný Forest District territory, the least tolerant were the allochthonous secondary spruce stands in the Modrava Forest District area. The damage dynamics was limited...

Effect of Mg fertilization on yellowing disease of Norway spruce at higher elevations of the Šumava Mts., Czech Republic

S. Vacek, V. Podrázský, M. Hejcman, J. Remeš

J. For. Sci., 2006, 52(10):474-481 | DOI: 10.17221/4528-JFS  

Norway spruce yellowing and defoliation caused by Mg deficiency was frequently recorded on many sites of the Šumava Mts. (Bohemian Forest Mts.) since 1980's. A forest experiment aimed at investigation response of spruce to Mg application (commercial fertilizer SILVAMIX^® Mg NPK) was set up in 1998. Fertilizer was applied manually in a dose of 96.5 kg Mg/ha in spruce (S) and beech-spruce (BS) vegetation altitudinal zones in spring 2000. Immediate decrease of yellowing was revealed in fertilized plots in both vegetation zones and yellowing almost completely disappeared at the end of the investigation in 2005. Further, fertilization resulted...

Biomass and element pools of selected spruce trees in the catchments of Plešné and Čertovo Lakes in the Šumava Mts.

M. Svoboda, K. Matějka, J. Kopáček

J. For. Sci., 2006, 52(10):482-495 | DOI: 10.17221/4529-JFS  

This paper presents detailed data on the biomass and element pools of six sample trees in the catchments of Plešné andČertovoLakes. Diameters and heights of the sample trees ranged from 28.0 to 63.7 cm and from 14.1 to 38.7 m. The age of the sample trees ranged from 84 to 177 years. Total biomass of the sample trees was in the range of 239.4 kg to 2,932.3 kg. Variation of total biomass between the sample trees was a consequence of the tree biometric data (height and dbh) and age differences. The proportion of stem wood and bark ranged from 63.5 to 69.5%, and from 4.6 to 7.2%, respectively. The proportion of foliage and fine branches ranged from 4.3...