...
part
of
a
larger
project
aimed
at
modeling
growth
of
pure
even-aged
stands
of
common
beech,
on
the
basis
of
a
network
of
permanent
plots
observed
since
the
turn
of
the ...
generalization
of
Eichhorn’s
rule
The
data
analysis
of
the
3
previous
sec-
tions
provides
a
model
for
the
3
compo-
nents
of
productivity
in
even-aged
beech...
...
cut.
We
designed
a
model
to
predict
photosynthe-
sis
of
heterogeneous
canopies
and
wood
respiration.
The
output
of
the
model
to-
gether
with
measurements
of
aerial
growth
enabled ...
between
the
foliage
of
different
trees
until
the
end
of
the
first
year.
The
leaves
in
the
model
were
distributed
homogeneously
within
ellipsoids
or
fractions...
... Jablunkov
Fig. 4. Content of chromium (median) (mg/kg) in soil profiles of spruce (left) and beech (right) stands
Table 4. Median of contents of elements in both compared stands (mg/kg)
N (g/kg) ... the area of the Pass. is
is confirmed by the highest values of the median:
Zn = 103 mg/kg in contrast with 70.6 mg/kg in
spruce stands and 121 in contrast with 101 mg/kg...
... causes of the observed acceleration of
forest growth: weather conditions, atmospheric concentration
Figure 8. Variation of mean country
Net Ecosystem Productivity with
latitude of centre of country ... the effect of many more variables e.g. nitrogen
deposition, than the ecosystem model which allowed a more
detailed assessment of the relative importance of the variables
a...
... total tree
C pool at year of felling. In even-aged stands stem C pool can
be modeled as a function of tree radius and its age. Conifer
wood density can be a good proxy of radial increment [4, 18,
27]. ... abies (L.) Karst. even-aged
stands. Tree age, height and wood density can be good proxies of
stem C pool in conifer even-aged stands.
i: Cross-section increment number
n:...
... height model is a key com-
ponent for obtaining good estimates of the growth and yield of
ponderosa pine.
Four variations of the logistic model were fit to the data. In
each variation, the basic model ... before fitting the model with the
lag-1 sample autocorrelation [29, p. 279] calculated from the residuals
in model (1). A different value of φ was estimated for each plot...
...
exponential
function
of
the
length
of
the
photon
pathway
within
the
needle
before
reaching
the
point
under
consideration.
Results
Measured
rates
of
photosynthesis
of
a
shoot
subjected ...
case
of
a
highly
directional
field,
and
the
rate
of
photosyn-
thesis
per
unit
of
intercepted
radiation
should
logically
be
higher
(cf.
Oker-Blom,
1985).
The...
... identification pro-
cedure and guarantees the quality of the fitted parameters and the wide
range of validity of the resulting constitutive model.
2.2. Simulation of the experimental tests
The creep function ... between softwood and
hardwood is obvious. The glass transition of softening temper-
ature for wood depends on the physical method used and the
constant of time. Neverthe...
... models e.g. [3, 23, 39, 40]. These
results are consistent with the dynamic process of the intra-spe-
cific competition and the natural mortality of even-aged stands
[8, 13, 36, 37].
The use of ... number of plots without observed mortality over a
period of t years and n
0
is the number of plots with observed mortality
at the same period of time. The weight used was the...
... natural
processes of plant succession instead of composition types.
Opportunistic silviculture makes use of natural plant dynam-
ics. In the long term, natural development produces somewhat
regular stands of ... 40]. In addition, the possible problem of species
alternation arises for ash and sycamore: pure stands offer more
favourable conditions for the regeneration of the oth...