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Pregled bibliografske jedinice broj: 970638

ANALYSING THE EFFICIENCY OF MECHANISED THINNING IN BROADLEAF STANDS


Vusić, Dinko; Plantak, Marijo; Papa, Ivica; Đuka, Andreja; Pentek, Tibor; Poršinsky, Tomislav
ANALYSING THE EFFICIENCY OF MECHANISED THINNING IN BROADLEAF STANDS // FORMEC 2018–Improved Forest Mechanisation: mobilizing natural resources and preventing wildfires, September 25th-27th, 2018, Madrid, Spain / Tolosana, Eduardo (ur.).
Madrid: Fundación Conde del Valle de Salazar, 2018. str. 362-363 (predavanje, međunarodna recenzija, sažetak, znanstveni)


CROSBI ID: 970638 Za ispravke kontaktirajte CROSBI podršku putem web obrasca

Naslov
ANALYSING THE EFFICIENCY OF MECHANISED THINNING IN BROADLEAF STANDS

Autori
Vusić, Dinko ; Plantak, Marijo ; Papa, Ivica ; Đuka, Andreja ; Pentek, Tibor ; Poršinsky, Tomislav

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
FORMEC 2018–Improved Forest Mechanisation: mobilizing natural resources and preventing wildfires, September 25th-27th, 2018, Madrid, Spain / Tolosana, Eduardo - Madrid : Fundación Conde del Valle de Salazar, 2018, 362-363

ISBN
978-84-96442-84-9

Skup
FORMEC 2018–Improved Forest Mechanisation: mobilizing natural resources and preventing wildfires

Mjesto i datum
Madrid, Španjolska, 25-27.9.2018

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
harvester, forwarder, productivity, cost, European hornbeam

Sažetak
The research conducted had a focus on different aspects of efficient mechanized timber harvesting by a harvester (Timberjack 1470D) – forwarder (Timberjack 1710D) system in an 80-year old broadleaf harvesting site. Stemwood of higher quality and of suitable dimensions was bucked-to-quality to produce sawlogs and veneer logs (according to national standards) and other stemwood and crown was processed into 4-meter round energy wood by cut-to-length method. Energy wood was forwarded separately from the sawlogs and veneer logs. The harvesting site consisted of two adjacent sub-compartments ; one European hornbeam dominated stand (area 18.28 ha, harvesting density 98 trees/ha and 40 m3/ha, average DBH of marked trees 21.7 cm, average primary transport distance 250m) and one European beech dominated stand (9.07 ha, harvesting density 62 trees/ha and 49 m3/ha, average DBH of marked trees 26.4 cm, average primary transport distance 550 m). In both sub-compartments European hornbeam trees prevailed in the marked trees ; both in number (92 trees/ha and 47 trees/ha) and volume (38 m3/ha and 29 m3/ha). In addition to usual, productivity (and unit cost) research, stem data validation was conducted and the quality of processing the roundwood was determined. Harvester’s work was digitally video recorded and time consumption of individual work elements was latter analyzed on tree level by UmtPlus software. The same software was directly applied in the study of forwarder’s work, which was analyzed on cycle level. During the research 795 trees were felled and, and 41 forwarding cycles recorded. A sub-sample of 94 trees felled and processed was measured to construct net volume vs. DBH equation for the harvester’s productivity model. The same sub-sample was used to determine the quality of processing the roundwood and to validate the stem data recorded by harvester ; i.e. to test the accuracy of harvester measurement and volume calculation. Differences in time consumption for felling between two sub-compartments were not found, and differences for processing stemwood and for processing crowns were minimal and resulted mainly from different DBH range (although the characteristics of the harvesting head balanced the sample leaving mainly European beech trees with DBH over 52 cm for motor-manual felling and processing.) Therefore, a single productivity model was developed, resulting with the productivities (including delays) from 3.9 m3/h (DBH 12.5 cm) to 16.8 m3/h (DBH 42.5 cm). Key factors influencing the productivity (apart from the DBH) were identified as time to process the crown (in average 75% of the total processing time) and a high allowance time of 33% of the total effective time (as a result of the increased mechanical delays). Significant differences in stem file data volume per tree and volume per tree manually measured were found, namely as a consequence of frequent multiple handling (and measuring) of energy wood processed in the crown. This work method, while being beneficial in terms of productivity, also resulted in “un-standard” form of 15% of the produced number of roundwood assortments. Forwarding productivity (including delays) ranged from 11.1 m3/h (100 m) to 7.3 m3/h (800 m) mostly due to ideal weather conditions that enabled average load of 13.28 m3. On harvesting system level unit cost of traditional harvesting system that is generally applied in similar conditions (motor-manual felling and processing and skidding of roundwood) can be reached by significantly increasing the annual utilization of a harvester from today’s quite modest 1.125 h to nearly 3.000 h. Those figures will be hard to reach without a significant shift towards stronger implementation of mechanized felling and processing in natural broadleaf stands which prevail in the structure of Croatian forests. In the meantime, if the labor shortages of forest workers continue, application of the harvesters will have to be accepted even in the case when they are not cost competitive (that is, cost competitive in terms of timber harvesting unit cost calculations) but are the only means of work available to complement the motor-manual harvesting in achieving the planned annual cut.

Izvorni jezik
Engleski

Znanstvena područja
Šumarstvo



POVEZANOST RADA


Ustanove:
Šumarski fakultet, Zagreb

Profili:

Avatar Url Tibor Pentek (autor)

Avatar Url Tomislav Poršinsky (autor)

Avatar Url Ivica Papa (autor)

Avatar Url Andreja Đuka (autor)

Avatar Url Dinko Vusić (autor)

Citiraj ovu publikaciju

Vusić, Dinko; Plantak, Marijo; Papa, Ivica; Đuka, Andreja; Pentek, Tibor; Poršinsky, Tomislav
ANALYSING THE EFFICIENCY OF MECHANISED THINNING IN BROADLEAF STANDS // FORMEC 2018–Improved Forest Mechanisation: mobilizing natural resources and preventing wildfires, September 25th-27th, 2018, Madrid, Spain / Tolosana, Eduardo (ur.).
Madrid: Fundación Conde del Valle de Salazar, 2018. str. 362-363 (predavanje, međunarodna recenzija, sažetak, znanstveni)
Vusić, D., Plantak, M., Papa, I., Đuka, A., Pentek, T. & Poršinsky, T. (2018) ANALYSING THE EFFICIENCY OF MECHANISED THINNING IN BROADLEAF STANDS. U: Tolosana, E. (ur.)FORMEC 2018–Improved Forest Mechanisation: mobilizing natural resources and preventing wildfires, September 25th-27th, 2018, Madrid, Spain.
@article{article, editor = {Tolosana, E.}, year = {2018}, pages = {362-363}, keywords = {harvester, forwarder, productivity, cost, European hornbeam}, isbn = {978-84-96442-84-9}, title = {ANALYSING THE EFFICIENCY OF MECHANISED THINNING IN BROADLEAF STANDS}, keyword = {harvester, forwarder, productivity, cost, European hornbeam}, publisher = {Fundaci\'{o}n Conde del Valle de Salazar}, publisherplace = {Madrid, \v{S}panjolska} }




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