Journal of Forest Science, 2009 (vol. 55), issue 2
Development of foliage biomass of young spruce and beech stands in the mountain water balance research area
P. Kantor, F. Šach, V. Černohous
J. For. Sci., 2009, 55(2):51-62 | DOI: 10.17221/72/2008-JFS 
The investigation of foliage biomass development including LAI and the growth of spruce and beech stands in the juvenile stage (age 1 to 21 years) represents a special complementary study to long-term research of water balance components on the experimental forest hydrology area Deštné Mountainside. The experiment is located in the Orlické hory Mts. at the altitude of 900 m on a clear-felled area. In 1982 the spruce plantation was established at 1.5 ´ 1.5 m spacing (4,600 plants/ha) and the beech plantation at 1.0 ´ 1.0 m (10,000 plants/ha). According to tending programs applicable to forest stands in the Czech Republic, two improvement fellings were...
Assessment of tree layer biomass and structure using aerial photos in lake catchments of the Šumava Mts.
K. Matějka
J. For. Sci., 2009, 55(2):63-74 | DOI: 10.17221/95/2008-JFS
The combination of georeferenced colour aerial photos and limited field measurements of individual trees was used to determine tree stand biomass in forests of prevailing Norway spruce. The technique was carried out in two localities - small catchments of natural lakes in the Bohemian Forest (56 and 76 ha in size, respectively). This method is not so expansive as the inventory based on sample plots, namely in the terrain of high dynamics in the mountains. Tree crown diameters were determined semi-automatically on the basis of orthophotos. The catchment of Plešné jezero Lake can be described by these average values: crown diameter 4.5 ± 1.35...
Polyamines during somatic embryo development in Norway spruce (Picea abies [L.])
J. Malá, M. Cvikrová, P. Máchová, O. Martincová
J. For. Sci., 2009, 55(2):75-80 | DOI: 10.17221/84/2008-JFS
Contents of free polyamines (putrescine, spermidine and spermine) were determined in different developmental stages of Norway spruce (Picea abies [L.] Karst.) somatic embryos by means of HPLC. Determinations were performed embryogenic tissue after 4 weeks of the growth on proliferation medium, after 2 and 5 weeks of the culturing on maturation medium, and 2 weeks after desiccation. Maturation of somatic embryos (after 5 weeks) was accompanied by increase of concentrations of putrescine (2.3 times) and spermidine (3.2 times). In comparison with above mentioned polyamines, spermine concentrations were significantly lower (4.3 times). Two weeks...
Verification of the food supply to game under conditions of the floodplain forest ecosystem
J. Feuereisel, M. Ernst
J. For. Sci., 2009, 55(2):81-88 | DOI: 10.17221/32/2008-JFS
In order to determine the environment carrying capacity in terms of biomass production utilizable by game 360 representative sample plots (1 × 1 m) were laid out in the growing season on the basis of typological classification in forest stand of an area of 1,796.49 ha in the studied region of the Soutok Game Preserve, Židlochovice Forest Enterprise, Lanžhot Forest District. On meadows, pastures and others areas producing grass and herbs of a total area of 532.87 ha, other 57 sample plots were laid out and sample of biomass utilizable by game. Quantification of the biomass was carried out on the basis of the area cover of grass and woody undergrowth....
Forest watershed runoff changes determined using the unit hydrograph method
V. Černohous, P. Kovář
J. For. Sci., 2009, 55(2):89-95 | DOI: 10.17221/94/2008-JFS
Unit hydrograph is a basic method to show changes in runoff in the watershed. The investigation of runoff changes was carried out in the U Dvou louček watershed situated at the summit part of the Orlické hory Mts., East Bohemia. The waveform ordinates of recession limbs of unit hydrographs obtained using a common approach had to be approximated by the least-squares method. Final hydrographs reflected both drainage treatment and forest stand growth influencing the runoff from the watershed. Both factors increase culmination in synergy and reduce runoff on the recession limb of the hydrograph. We confirmed increased maximum runoff taking up 25-30% of...
Productivity and cost of manual felling with a chainsaw in Caspian forests
F. K. Behjou, B. Majnounian, J. Dvořák, M. Namiranian, A. Saeed, J. Feghhi
J. For. Sci., 2009, 55(2):96-100 | DOI: 10.17221/69/2008-JFS
A field production study was conducted for a manual harvesting system using a chainsaw in a Caspian hardwood forest site. A selective cut was performed on a 42-hectare tract with an average slope of 30 percent. Felling time per tree was most affected by diameter at breast height and by the distance among harvested trees. The gross and net production rate was 20.6 m3 and 26.1 m3 per hour/one person, respectively. The unit cost considering the gross and net production rate was 1.05 USD/m3 and 0.81 USD/m3, respectively. The significant variables included diameter at breast height (D) and distance among...