Wyniki wyszukiwania

1

A model describing forwarder based logging performance in pine stands thinnings

100%

Walczak M., Grodecki J.

Acta Scientiarum Polonorum. Silvarum Colendarum Ratio et Industria Lignaria

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2012

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tom 11

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nr 3

Logging is an important element of wood production. Its modelling gives an opportunity to compare different scenarios before the work has started and may be helpful in future operations planning. A computer program was created which includes basic factors influencing forwarder efficiency: parameters of the machine, the stand and the assortments. The results of the simulation confirm relations between certain factors and forwarder performance given by other authors. Counted absolute values may be higher than real. Relative comparison of relations between factors is more accurate.

2

Damages to the surface layer of soil during timber harvesting using the equipment aggregated with farm tractors

100%

Kulak D., Sowa J. M., Stanczykiewicz A., Szewczyk G.

Acta Scientiarum Polonorum. Silvarum Colendarum Ratio et Industria Lignaria

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2012

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tom 11

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nr 2

In the study, impact of three devices aggregated with farm tractors on forest soil was compared – FRANSGARD 6000 GS cable winch and two processors – NIAB 5-15 and HYPRO 450. The basic difference between the above mentioned machines consists in the fact that the cable winch skids debranched tree stems while processors skid the whole trees, including their tree-tops. The percentage of soil injured in late pine stand thinning reached, respectively: 1.2%, 2.2% and 5.5%. The analysis of significance of differences in Ug indicators characterising the damages induced has shown that only the indicator computed for HYPRO processor is significantly higher than the others. However, as the simulation performed has confirmed, appropriate thickening of skidding routes enables to achieve a comparable level of damages for all the machines examined. Taking into account the impact on forest soil, application of processors aggregated with farm tractors can be recommended for thinning stands.

3

Differentiation of tree diameters at strip roads in a young pine tree-stand

100%

Stempski W., Jablonski K.

Acta Scientiarum Polonorum. Silvarum Colendarum Ratio et Industria Lignaria

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2014

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tom 13

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nr 1

The investigation was conducted in a 32-year-old pine stand, growing on a fresh coniferous site in western Poland. The strip roads in the stand had been designed and cut along tree rows 5 years prior to the investigation. The analysis focused on trees growing at 12 strip roads, in 3-meter-wide stripes on both sides of the strip roads and in control zones, half-way between each two neighbouring strip roads. The trees growing on the stripes along the strip roads were divided into three zones corresponding to tree rows. The first zone (I) was formed by trees growing in the row directly at the strip roads, while the zones two (zone II) and three (zone III) were formed by trees growing in the second and third rows of trees away from the strip roads, respectively, on both sides of the strip roads. The average distances of the zones two and three from the strip roads were 1.5 and 3 m, respectively. The diameters at breast height (DBH) of all the trees growing in the respective zones were measured. Moreover, the widths of the strip roads were measured, which resulted in dividing the strip roads into two groups: the wider strip roads (average width 3.6 m) and the narrower ones (average width 2.9 m). The statistical analysis showed significant differences in DBH values between the analysed zones, for nine of the strip roads. Both in the case of the wider strip roads, as well as in the case of the narrower ones, the trees growing directly along the strip roads were usually thicker than the more distant trees. A statistically significant difference between the DBH values of trees from zone I and II was found for one strip road. In most cases the trees from zone I were statistically thicker than the trees growing in the control zone.

4

Classical and order statistics of effective active time of felling at use chainsaw

100%

Glazar K., Bocianowski J.

Acta Scientiarum Polonorum. Silvarum Colendarum Ratio et Industria Lignaria

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2012

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tom 11

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nr 2

The time, within which accordingly to its application machine works, and an object of work and working groups are under load,is the effective active time. The purpose of the research was the classical and order statistics of effective active time of felling at use chainsaw. The average effective active time of felling of one tree was about 2 s. The cut trees were strong statistical diversified from the point of view of effective active time of felling. The positive skewness coefficient has confirmed, that statistical units with value of feature below arithmetic mean were prevailed – right-sided asymmetry.

5

Thinning of fruit sets on Sampion apple trees

100%

Nosal K., Poniedzialek W.

Acta Agraria et Silvestria. Series Agraria

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2002-2003

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tom 41

In the years 1999-2001 in the Garlica Murowana Experimental Station the thinning of fruit sets on Sampion apple trees was carried out manually or chemically with urea. The effects of the treatments on fruit setting, total yield, and the weight and diameter of fruit were investigated. Manual thinning of fruit sets effected a decrease in the number and an increase in the weight of apples. Urea applied at the end of blooming strongly thinned the fruit sets yet it favourably affected the weight of apples. The results of the experiment show that spraying trees with urea by the end of April and a week after blooming favourably affects the yield of' fruit.

6

Thinning of 'Katja' apple trees with chemicals and manually

100%

Porebski S., Banach P., Rzeznicka B.

Journal of Fruit and Ornamental Plant Research

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2006

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tom 14

7

Efficacy of natural compounds used for thinning in organic apple orchards

100%

Basak A.

Journal of Fruit and Ornamental Plant Research

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2006

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tom 14

8

Damage to trees and regeneration layer resulting from timber harvesting with the use of equipment aggregated with farm tractors in thinned pine stands

84%

Stanczykiewicz A., Sowa J. M., Kulak D., Leszczynski K., Szewczyk G.

Acta Scientiarum Polonorum. Silvarum Colendarum Ratio et Industria Lignaria

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2012

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tom 11

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nr 2

The research was conducted in pine stands where selective early and late thinning was carried out with the use of NIAB 5-15 and HYPRO 450 debranching and cutting processors along with a FRANSGÅRD V-6000 GS cable winch aggregated with farm tractors. In case of cut-to-length system, timber harvesting was executed by means of processors and in case of tree-length system – by means of a cable winch. The harvested timber was forwarded to the depots in the second stage with the use of self-loading trailers or skidded with the use of a cable winch. Tree damage in case of processor technology oscillated at the level of 3.1-11.3%, and in case of a cable winch: 3.0-10.9%. The level of damage to the regeneration layer amounted to 4.1-27.1% for the areas where processors had been used. For the areas where timber was harvested by means of a cable winch, the level of tree damage was 5.2 -14.0% of trees growing under the main stand’s crown layer.

9

Selected ecological aspects of fully mechanized logging technologies and wood skidding utilization in the thinnings

84%

Lukac T., Koren J.

Electronic Journal of Polish Agricultural Universities. Series: Forestry

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2004

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tom 07

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nr 2

10

The assessment of the level of energy expenditure of forest workers dislodging trees hang during early thinning

84%

Sowa J. M., Kulak D.

Zeszyty Naukowe Akademii Rolniczej w Krakowie. Sesja Naukowa

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2005

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tom 91

367-373

11

Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik

Litter-fall and humus accumulation in thinning experiment Kristianov in the Jizerske Hory Mts.

84%

Novak J., Slodicak M., Dusek D.

Folia Forestalia Polonica. Series A . Forestry

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2010

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tom 52

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nr 2

12

Optimisation of thinning of apple fruitlets cv. 'Braeburn Mariri Red'

84%

Szot I., Lipa T.

Acta Agrophysica

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2019

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tom 26

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nr 3

13

Effect of thinning in Scotch pine [Pinus sylvestris L.] stand growing on forest land, on suppressiveness of soil to Heterobasidion annosum [Fr.] Bref. and Armillaria obscura [Schaeff.] Herink.

84%

Manka M., Lakomy P., Mackowiak S.

Phytopathologia Polonica

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1993

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tom 06

14

Correlations between fruit size and fruit quality in apple trees with high and standard crop load levels

84%

De Salvador F. R., Fisichella M., Fontanari M.

Journal of Fruit and Ornamental Plant Research

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2006

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tom 14

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nr Suppl.2

15

Effect of thinning in Scotch pine [Pinus sylvestris L.] stand growing on former arable land, on suppressiveness of soil to Heterobasidion annosum [Fr.] Bref. and Armillaria obscura [Schaeff.] Herink

84%

Manka M., Lakomy P.

Phytopathologia Polonica

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1995

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tom 09

16

The effect of strip roads in pine stands on the population size of large pine weevil - Hylobius abietis [L.]

84%

Korczynski I., Kuzminski R., Mazur A.

Acta Scientiarum Polonorum. Silvarum Colendarum Ratio et Industria Lignaria

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2007

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tom 06

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nr 2

17

Czasochlonnosc pozyskiwania drewna z uzyciem procesora NIAB 5-15 w drzewostanach trzebiezowych

67%

Sowa J. M., Szewczyk G.

Acta Agraria et Silvestria. Series Silvestris

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2008

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tom 46

53-66

The aim of the present research was to determine the models of the work consumption characteristics at the work-stand of the operator of the NIAB 5-15 processor aggregated with the farm tractor. Modelling consisted in approximating the mathematical functions which described the processes under analysis. The present research was conducted in pine, fir and spruce stands during early and late thinnings, where timber skidding, debranching and manipulation was performed. The research results indicate the occurrence of proportional relations between work consumption and the volume of the harvested timber, certain elements of the working day timing and the index of the quantitative intensity of harvesting which characterizes the percentage of the number of trees removed from a stand.

18

Cambio- and xylophagous insects infesting Scots pine (Pinus sylvestris L.) cut off tree-tops and branches left in the forest after thinnings and final cuttings

67%

Starzyk J. R., Bilecka K., Purgal M., Rotman K.

Acta Scientiarum Polonorum. Silvarum Colendarum Ratio et Industria Lignaria

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2008

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tom 07

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nr 1

The investigations were carried out in selected Scots pine (Pinus sylvestris L.) stands in Gidle, Koszęcin, and Złoty Potok forest districts (Regional Directorate of State Forests in Katowice). The majority (89.2%) of analyzed 212 Scots pine tree-tops and branches, left in the forest after cuttings, were infested by cambio- and xylophagous insects (Curculionidae – 19 species, Cerambycidae – 4 species). The mean number of brood galleries in a single piece of the examined material was 64. The following insect species were characterized by the highest values of dominance, frequency, and dominance structure: Pityogenes bidentatus, Pogonocherus fasciculatus, Pissodes piniphilus, Pityogenes quadridens, Pityophthorus pityographus, and Magdalis frontalis. Three different insect communities and 63 associations of a definite dominance structure were distinguished. Also preferences of the most abundant species in respect of diameter and bark thickness of 0.5-meter-long sections of tree-tops and branches were determined. The majority of insect species infested top and branch segments 2.6-4.5 cm in diameter with the bark 2 mm thick. Treatments aiming at reduction of reproduction of secondary insect pests on Scots pine cut off tree-tops and branches are proposed.

19

Effect of spring frosts on the yield and effectiveness of flower and fruit bud thinning in two apple tree cultivars

67%

zachwieja M.

Zeszyty Problemowe Postępów Nauk Rolniczych

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2009

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tom 536

Doświadczenie przeprowadzono w latach 2004-2005 w Rolniczo-Sadowniczym Gospodarstwie Doświadczalnym w Przybrodzie koło Poznania. W badaniu oceniano stopień uszkodzeń przymrozkowych przy zróżnicowanych zabiegach chemicznego przerzedzania kwiatów i zawiązków na plon dwóch odmian jabłoni Šampion i Elstar. Uszkodzenia pąków kwiatowych oceniano na podstawie żywotności słupka, a plon drzew na podstawie kilogramów owoców z drzewa. Wykazano, że wielkość uszkodzeń kwiatów i zawiązków przez przymrozki zależna była od terminu występowania, wysokości ujemnej temperatury oraz fazy fenologicznej w jakiej znajdowała się dana odmiana. Przymrozki wiosenne w 2004 roku w znaczący sposób zmniejszały plon odmiany Elstar, w porównaniu do odmiany Šampion, natomiast przymrozki wiosenne w 2005 roku nie miały istotnego wpływu na plon u obu odmian jabłoni.

20

Determination of selected logging technologies impact, in thinned coniferous stands, on damage level of trees

67%

Sowa J. M., Stanczykiewicz A.

Zeszyty Naukowe Akademii Rolniczej w Krakowie. Sesja Naukowa

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2005

|

tom 91

275-281

Ograniczanie wyników

A model describing forwarder based logging performance in pine stands thinnings

Damages to the surface layer of soil during timber harvesting using the equipment aggregated with farm tractors

Differentiation of tree diameters at strip roads in a young pine tree-stand

Classical and order statistics of effective active time of felling at use chainsaw

Thinning of fruit sets on Sampion apple trees

Thinning of 'Katja' apple trees with chemicals and manually

Efficacy of natural compounds used for thinning in organic apple orchards

Damage to trees and regeneration layer resulting from timber harvesting with the use of equipment aggregated with farm tractors in thinned pine stands

Selected ecological aspects of fully mechanized logging technologies and wood skidding utilization in the thinnings

The assessment of the level of energy expenditure of forest workers dislodging trees hang during early thinning

Litter-fall and humus accumulation in thinning experiment Kristianov in the Jizerske Hory Mts.

Optimisation of thinning of apple fruitlets cv. 'Braeburn Mariri Red'

Effect of thinning in Scotch pine [Pinus sylvestris L.] stand growing on forest land, on suppressiveness of soil to Heterobasidion annosum [Fr.] Bref. and Armillaria obscura [Schaeff.] Herink.

Correlations between fruit size and fruit quality in apple trees with high and standard crop load levels

Effect of thinning in Scotch pine [Pinus sylvestris L.] stand growing on former arable land, on suppressiveness of soil to Heterobasidion annosum [Fr.] Bref. and Armillaria obscura [Schaeff.] Herink

The effect of strip roads in pine stands on the population size of large pine weevil - Hylobius abietis [L.]

Czasochlonnosc pozyskiwania drewna z uzyciem procesora NIAB 5-15 w drzewostanach trzebiezowych

Cambio- and xylophagous insects infesting Scots pine (Pinus sylvestris L.) cut off tree-tops and branches left in the forest after thinnings and final cuttings

Effect of spring frosts on the yield and effectiveness of flower and fruit bud thinning in two apple tree cultivars

Determination of selected logging technologies impact, in thinned coniferous stands, on damage level of trees