Silva Fennica
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Performance modelling in forest operations through partial least square regression
Silva Fennica - Tập 46 Số 2
Partial Least Square (PLS) regression is a recent soft-modelling technique that
generalizes and combines features from principal component analysis (PCA) and
multiple regression. It is particularly useful when predicting one or more
dependent variables from a large set of independent variables, often collinear.
The authors compared the potential of PLS regression and ordinary linear
regression for...
Forest damage caused by the Canadian beaver (Castor canadensis) in South Savo, Finland
Silva Fennica - Tập 33 Số 4
Crown condition as an indicator of the incidence of root rot caused by Heterobasidion annosum in Scots pine stands
Silva Fennica - Tập 36 Số 2
Trees in three Scots pine stands seriously infected by Heterobasidion annosum
were classified according to their crown condition into four classes, from
healthy to dead trees. After cutting the stands, the classification was compared
with the symptoms of annosum root rot on stump surfaces (pitched area) and with
the extension of decay in the roots of excavated stumps. When dead trees were
included...
Resistance of Scots pine half-sib families to <i>Heterobasidion annosum</i> in progeny field trials
Silva Fennica - Tập 54 Số 4
Five Scots pine ( L.) progeny field trials, each established in different
Lithuanian regions of provenance in 1983, were studied. Each progeny field trial
consists of 140 half-sib families from seven populations (20 families from each
population). The evaluation was carried out in 2012 and 2018 to assess the
families resistance to (Fr.) Bref. An index of resistance in the infected plots
was calcul...
Regional energy wood logistics – optimizing local fuel supply
Silva Fennica - Tập 43 Số 1
The promotion of electric energy production from solid biomass by the Austrian
government has lead to a boom in the construction of new combined heat and power
plants. The current total demand for wood chips in the research area for energy
purposes is 70 400 m of loose volume chips per year. The expected increase in
demand due to these new plants is more than 4 times greater than current demand:
u...
The effects of number of stems per stool on cutting productivity in coppiced <i>Eucalyptus</i> plantations
Silva Fennica - Tập 50 Số 2
A time study was conducted to determine whether stem crowding had any impact on
harvester productivity in stands. This represents an important element when
trying to balance the advantages and disadvantages of coppice management in fast
growing plantations designated for mechanized harvesting (i.e. machine felling,
delimbing, debarking and cross-cutting). The study material consisted of 446
coppic...
Needle chronologies on Pinus sylvestris in northern Estonia and southern Finland
Silva Fennica - Tập 33 Số 3
A needle trace method was used to reveal the chronology of needle retention on
Scots pine (Pinus sylvestris L.) in southern Finland (two stands) and northern
Estonia (two stands). The average annual summer needle retention along the main
stem varied from 2.2 to 3.1 in Estonian stands and between 3.4 and 4.2 in
Finnish stands during the period 1966â1990. The 23-year-mean needle age was
3.0 and 2....
Precommercial thinning in naturally regenerated Scots pine stands in northern Finland.
Silva Fennica - Tập 31 Số 4
Dynamic interactions between forest structure and fire behavior in boreal ecosystems
Silva Fennica - Tập 36 Số 1
This paper reviews and synthesizes literature on fire as a disturbance factor in
boreal forests. Spatial and temporal variation in the biophysical environment,
specifically, vegetative structure, terrain, and weather lead to variations in
fire behavior. Changes in slope, aspect, elevation, and soil affect site energy
and water budgets and the potential plant community. These terrain features also
...
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