Journal of Forest Science, 2007 (vol. 53), issue 7
Biological activity of anthropogenic soils after spoil-bank forest reclamation
J. Remeš, R. Šíša
J. For. Sci., 2007, 53(7):299-307 | DOI: 10.17221/2075-JFS 
The paper presents the results of relatively long-term research focused on spoil bank revitalization pro-cesses in the North Bohemian Brown Coal Basin after the first three years of observations. The biological activity of soil (namely catalase and phosphatase activity), indicators of basal and potential soil respiration, ammonification and growth, development and nutrition status of forest plantations were selected as indicators of this revitalization process. These parameters were determined in five localities of different age of reclamation where different technological approaches and tree species compositions were used. The results confirm the...
Selected physical properties of initial soils on the outside spoil bank of the Belchatow brown coal mine
M. Pająk, W. Krzaklewski
J. For. Sci., 2007, 53(7):308-313 | DOI: 10.17221/2077-JFS
The purpose of the study was to assess, in respect of selected physical properties, the reclamation of the northern slope of the outside spoil bank of the Belchatów brown coal mine by reforestation carried out 20 years ago. Investigations were carried out on 55 permanent research plots. This study confirmed the efficiency of reclamation of strip-mine spoils, and its results allowed to point out the properties of initial soils as the most useful characteristics for the assessment of land reclamation by reforestation.
Soil compaction caused by 450C Timber Jack wheeled skidder (Shefarood forest, northern Iran)
R. Naghdi, I. Bagheri, M. Akef, A. Mahdavi
J. For. Sci., 2007, 53(7):314-319 | DOI: 10.17221/2026-JFS
In forest harvesting operations usually after using skidding machinery (skidders), traces of soil damage in the form of soil compaction and wheel and logs ruts can be seen in the forest soil. Soil bulk density, which represents soil compaction, decreases soil porosity, infiltration rate and aeration and these in turn increase runoff and water erosion in the harvested area. On the other hand, a decrease in soil aeration prevents root growth and decreases the vegetative cover. In this study the changes in soil bulk density and relative soil compaction due to a different number of wheeled skidder passes from stump to landing for two soil types (clay soil...
Improving RBS estimates - effects of the auxiliary variable, stratification of the crown, and deletion of segments on the precision of estimates
J. Cancino, J. Saborowski
J. For. Sci., 2007, 53(7):320-333 | DOI: 10.17221/2078-JFS
Randomized Branch Sampling (RBS) is a multistage sampling procedure using natural branching in order to select samples for the estimation of tree characteristics. The existing variants of the RBS method use unequal selection probabilities based on an appropriate auxiliary variable, and selection with or without replacement. In the present study, the effects of the choice of the auxiliary variable, of the deletion of segments, and of the stratification of the tree crown on the sampling error were analyzed. In the analysis, trees of three species with complete crown data were used: Norway spruce (Picea abies [L.] Karst.), European mountain ash...
The fauna of cambioxylophagous insects on Scots pine trees declined after spells of drought in 2003
J. Foit
J. For. Sci., 2007, 53(7):334-339 | DOI: 10.17221/2079-JFS
The paper deals with cambioxylophagous insects on Scots pine (Pinus sylvestris L.) trees. Research was conducted in forest stands growing on steep slopes on the left bank of the Otava River about 1 km north of PÃsek. These are nearly unmanaged stands of a special-purpose function with the natural occurrence of Scots pine. In total, twenty standing trees at 60 to 160 years of age that died after the spell of drought in 2003 were analysed. The composition of the community of cambioxylophagous insects was recorded in detail. The frequencies of occurrence of particular insect species were determined. In total, 34 species of cambioxylophagous...
Contribution to the knowledge of Clethrionomys glareolus populations in forests of managed landscape in Southern Moravia (Czech Republic)
J. Suchomel
J. For. Sci., 2007, 53(7):340-344 | DOI: 10.17221/2076-JFS
In intensively managed landscape, the dynamics of the bank vole (Clethrionomys glareolus, Cg) populations was studied in three types of forest complexes which differed in food supply. The first type was an old semi-natural forest with dominance of oak (HL), the second was a production broad-leaved forest with dominant oak and black locust (HA), and the third was a pheasantry with a variable mixture of forest stands of various woody species and age with a permanent supply of food for pheasants and roe deer (RB). The population fluctuations in four years of research were influenced by the seed year (2003, oak mast harvest), so higher population...