Journal of Forest Science, 2012 (vol. 58), issue 7
Effects of wildfire on a pine stand in the Bohemian Switzerland National Park
J. Trochta, K. Král, P. Šamonil
J. For. Sci., 2012, 58(7):299-307 | DOI: 10.17221/68/2011-JFS 
The pine stand in the Havraní Skála locality in the Bohemian Switzerland National Park was affected by an extensive mixed-severity wildfire in summer 2006. The fire severity, fire type and fire extent were assessed by various fire severity measures collected in the field (mean bole char height on stems on sample plots, content of oxidizable C and total N at a soil depth of 0-5 cm), as well as by classification and filtering of green canopy cover from time series of aerial photographs acquired before the fire (2005), soon after the fire (2006) and one year after the fire (2007). The specific image analyses made it possible to uncover the spatial and...
The effect of deforestation on spring water chemistry on Skrzyczne (Silesian Beskid Mountains, Poland)
S. Małek, K. Krakowian
J. For. Sci., 2012, 58(7):308-313 | DOI: 10.17221/77/2011-JFS
The Norway spruce dieback which occurred in the Western Carpathians is of interest to scientists in many fields. The goal of this research was to determine its effect on spring water chemistry. Due to environmental factors such as: high precipitation - up to 1,400 mm.year-1 while the average for Poland is 600 mm.year-1; kind of bedrock (the area is built of Godula Sandstone) which causes shallow water circulation so that springs are considered as shallow supplied, it was expected that the plant cover changes might affect spring water chemistry. Such observations were partially confirmed by Astel et al. (2008), when differences...
How much birch (Betula papyrifera) is too much for maximizing spruce (Picea glauca) growth: a case study in boreal spruce plantation forests
Ch.D.B. Hawkins, A. Dhar, B.J. Rogers
J. For. Sci., 2012, 58(7):314-327 | DOI: 10.17221/8/2012-JFS
Interest in conifer-broadleaf mixedwood forests has greatly increased due to continuous demand for hardwood products and a shift towards more biological or ecosystem-based management. In British Columbia, more than 30% of the productive forest land is a conifer-broadleaf mixture and current forest regulations are more conifer biased rather than maintaining a mixed-species condition. The aim of this study was to examine the impact of paper birch on white spruce growth. Spruce growth data from 10 to 18 years old complex stands indicate that radial, height, and stem volume was not impacted by retaining up to 3,000 stems.ha-1 of birch. Similarly,...
Winter survival of Phytophthora alni subsp. alni in aerial tissues of black alder
K. Černý, V. Strnadová
J. For. Sci., 2012, 58(7):328-336 | DOI: 10.17221/11/2012-JFS
The winter survival of the invasive pathogen Phytophthora alni subsp. alni in black alder stems was studied in the bankside alder stand of the Moravská Dyje River in southern Bohemia after two very different winter seasons: cold in 2008/2009, with the average temperature of -1.96°C, and extremely mild in 2006/2007, with the average temperature of 2.54°C. The difference in these two winters resembles the expected potential climate change in Central Europe in this century. After the cold winter of 2008/2009, the pathogen survived in only 13.91% of the samples, with the average survival rate of 2.70%. The pathogen survived the mild winter...