Báo cáo lâm nghiệp: "Rationalization of the performance of a mobile off-road system working in the forest environment with respect to its emission load" doc
... suitable machinery,
and in using acceptable methods for the employment
of machines with the rational performance. Pos-
sibilities to determine the rational performance of
machines are further ... of reaching its design
performance have to be considered.
Possibilities of increasing the design performance
of forest systems:
– Increased material flow range...
... inadequate because materials are not comparable.
Nevertheless the disparity of results between studies highlights
the importance of plant quality of cuttings as a critical factor,
at least during initial ... only set to germinate at a later stage, as to ensure
cuttings and seedlings were of similar size at planting.
These trials allowed a direct comparison between plants...
... of paths of each tree (eq. [1]) and
the true totals and variances of the target variables
and the estimates of the totals, respectively.
Choice of the auxiliary variable and variance of
the ...
beginning at the base of the segment, a proxy of the
volume of that part of the branch, as the auxiliary
variable. Each path was terminated when a diam...
... April in the Kostelec area (up to 80%), in con-
trast to the Doupov area (55%) and Šumava (46%),
may again signify the in uence of the area with
regard to both the time of farrowing and the mor-
phometric ... parameters. is confirms the findings
of M and F (2004) that in case
there is an abundance of food available during the
preceding a...
... tests of the potential support to the
vitality of the fir plantations by means of ameliorating
measures were a part of the experiment. A part of the
plantings was standard without soil amelioration ... after the growth termination at the
beginning of autumn. e height growth was evalu-
ated according to the parameters of all living fir indi-
viduals in...
... over the three Belgian regions: Flanders, Brussels-Capital and Wallonia; forest cover gives the ratio of the
regional forest area to the total regional area.
Region Total area Forest area Forest ... stock in the living biomass of the Bel-
gian productive forests was calculated for the year 2000. In a
final analysis, the BEF s.l. category that introduces th...
... content in the highly
decayed woody substrate. The high water storage capacity of
dead wood in combination with a high amount of released,
available N by bacteria would be able to explain the high ... shoots, and
roots of the seedlings were separated using a scalpel, and the three
parts were pooled for each pot to obtain adequate plant material for
analysis. Tota...
... mangostana. In addition, an increasing
number of branches of young Quercus petraea and an
increasing length growth of these branches with increasing
Table I. Results of regression analyses after ... (length) of the
main stem (mm), diameter (tenth of a mm) of main stem collar at a
permanently marked position 3 cm above the substrate surface,
diameter (tenth of a m...
... occurring for over than 20 years can be
interpreted as a response to the increase of harvesting intensity. The influence of climate was evaluated by comparing earlywood, latewood and
total ring indices ... past history of a 300-year-old Quercus petraea stand (the “Futaie des Clos”, 8 ha) located 20 km from the town of Le Mans in
the Forest of Bercé in the west...
... (Polnička, 1997). e mean leaf area of
A. glutinosa damaged by imagoes including the mean number of laid eggs in the laboratory. An asterisk* indicates the
occurrence of Beauveria bassiana. In rearings ... due to heavy
Table 1. Abundance of G. lineola imagoes at sweeping on A. glutinosa and A. incana (Polnička, 1996). e mean leaf area of
A. glutinosa damaged by im...