Performance modelling in forest operations through partial least square regressionSilva Fennica - Tập 46 Số 2
Corrado Costa, Paolo Menesatti, Raffaele Spinelli
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 reg...... hiện toàn bộ
Resistance of Scots pine half-sib families to <i>Heterobasidion annosum</i> in progeny field trialsSilva Fennica - Tập 54 Số 4
Adas Marčiulynas, Vaida Sirgedaitė‐Šėžienė, Povilas Žemaitis, Āris Jansons, Virgilijus Baliuckas
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...... hiện toàn bộ
Regional energy wood logistics – optimizing local fuel supplySilva Fennica - Tập 43 Số 1
Christian Kanzian, Franz Holzleitner, Karl Stampfer, Sarah F. Ashton
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 curren...... hiện toàn bộ
The effects of number of stems per stool on cutting productivity in coppiced <i>Eucalyptus</i> plantationsSilva Fennica - Tập 50 Số 2
Andrew McEwan, Natascia Magagnotti, Raffaele Spinelli
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...... hiện toàn bộ
Needle chronologies on Pinus sylvestris in northern Estonia and southern FinlandSilva Fennica - Tập 33 Số 3
Margus Pensa, Risto Jalkanen
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...... hiện toàn bộ
Dynamic interactions between forest structure and fire behavior in boreal ecosystemsSilva Fennica - Tập 36 Số 1
Kevin C. Ryan
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...... hiện toàn bộ