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Wyszukujesz frazę "thinning" wg kryterium: Temat


Wyświetlanie 1-3 z 3
Tytuł:
Uszkodzenia drzew i odnowienia w wyniku ręczno-maszynowego pozyskania drewna z wykorzystaniem urządzeń agregowanych z ciągnikami rolniczymi
Damage to trees and regeneration as a result of motor-manual timber harvesting using equipment aggregated with farm tractors
Autorzy:
Stańczykiewicz, A.
Powiązania:
https://bibliotekanauki.pl/articles/973972.pdf
Data publikacji:
2011
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
odnowienia lasu
pozyskiwanie drewna
procesor HYPRO
procesor NIAB 5-15
technologia pozyskiwania
uszkodzenia drzew
wciagarka Fransgard 6000 GS
ciecia pielegnacyjne
zebiegi pielęgnacyjne
agregaty ciągnikowe
ciągniki rolnicze
drzewostany młode
leśnictwo
drzewa leśne
thinning processor
cable winch
farm tractor
selective early thinning
pine stands
Opis:
The research was conducted in thinned pine stands, age class II, where cutting was carried out with chainsaws. Subsequent operations were performed using a NIAB 5−15 and HYPRO 450 delimber−bucker processor and a FRANSG RD 6000 cable winch aggregated with farm tractors. The timber harvesting technology was applied with a cut−to−length system using processors, and with a tree−length system using a cable winch. In the selected stands, nine study plots were established, in which the inventory of stand layers: trees and undercanopy regeneration was carried out twice (before and after felling). Based on the obtained data, the level of damage to trees and regeneration after thinning operations was calculated. In the case of the technology using processors, the level of damage to trees in individual manipulation plots was within the range of 4.3%−8.6% (total 7%), while for the winch technology it was from 3.1% to 5.8% (total 4.5%). As regards regeneration, damage resulting from the harvesting and skidding of timber using processors in individual manipulation plots was at a level of 4.1%−13.5% (total 8.5%) and damage resulting from the harvesting and skidding using a winch cable from 5.8% to 17.0% (total 9%).
Źródło:
Sylwan; 2011, 155, 02; 129-137
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zastosowanie monitora pracy serca do oceny efektywnego wydatku energetycznego w ręczno-maszynowych technologiach pozyskiwania drewna
Use of heart rate monitor in assessing the net energy expenditure during motor-manual cutting
Autorzy:
Leszczyński, K.
Stańczykiewicz, A.
Powiązania:
https://bibliotekanauki.pl/articles/990022.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
pozyskiwanie drewna
robotnicy lesni
operatorzy pilarek spalinowych
fizjologia pracy
tempo metabolizmu
wydatek energetyczny
czestosc skurczow serca
energy expenditure
chainsaw operator
timber harvesting
metabolism rate
late thinning
Opis:
Energy expenditure during labour constitutes one of the criteria used for assessing the laboriousness of timber harvesting. The major objective of this study was to point out the possibilities of defining work net energy expenditure (NEE) as related to the frequency of heart rate in the field exercise tests by changing posture and varied external work load. The scope of the study was restricted to the work of chainsaw operators performing hard physical labour during late thinning of fir and spruce on the middle mountain (Beskid Makowski, Beskid Śląski). The research involved dynamic work with elements of static load for which the NEE was investigated by means of heart rate as well as respiratory – indirect estimation of oxygen consumption as results of airflow measurement. The advantage of both methods is simplicity of application, the lack of necessity to perform additional analyses as time study and expected medium error. The conducted calculations pointed out to a strong linear correlation, where correlative coefficient was equal to 0.67. The conducted model analysis (including, among others: the normality, autocorrelation of residuals and identification of influential values) has confirmed its validity at the 10% statistical error. The obtained regression coefficient indicates a larger increase in value as compared to the available formulas with acceptable in practice standard error of prediction on 6.05 kJ/min level.
Źródło:
Sylwan; 2014, 158, 02; 124-131
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rozmiar i charakter naruszeń wierzchniej warstwy gleby powstałych podczas pozyskiwania i zrywki drewna w trzebieżach wczesnych drzewostanów świerkowych
The size and nature of damage to the topsoil caused by timber extraction and skidding during early thinning operations in spruce stands
Autorzy:
Sowa, J.
Kulak, D.
Stańczykiewicz, A.
Szewczyk, G.
Powiązania:
https://bibliotekanauki.pl/articles/973654.pdf
Data publikacji:
2011
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
pozyskiwanie drewna
zrywka drewna
warstwa wierzchnia
uszkodzenia gleby
zrywka konna
zrywka linowa
wciagarka Multi-FKS
leśnictwo
lasy górskie
drzwostany świerkowe
trzebież wczesna
oddziaływanie na glebę
gleby leśne
timber harvest
damage
early thinning
horse skidding
winch skidding
Opis:
The study concerns the impact of two harvesting technologies – one based on a traditional horse skidding and one using a small MultiFKS winch powered by chainsaw motor on the size and nature of damage to the surface soil layer. The study was conducted in a spruce stand where early thinning was carried out. The total share of soil disturbed during harvesting operations was not large accounting for 2.99% of the cutting area for horse skidding and 1.73% for skidding using a MultiFKS winch. The volume of damage to the topsoil was 8.38 m3/ha and 2.64 m3/ha, respectively. The likelihood of disturbances of the soil layer was 47% for horse skidding and 31% for skidding by means of a winch. Both technologies were character−ized by a similar, ca 5% likelihood of cutting of topsoil to a depth larger than 5 cm. For both technologies the likelihood of soil compaction was significantly lower than soil cutting.
Źródło:
Sylwan; 2011, 155, 05; 330-339
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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