scholarly journals Evaluation of the method of calculating the planned price of timber harvesting operations

2021 ◽  
Vol 145 (11-12) ◽  
pp. 515-524
Author(s):  
David Mijoč ◽  
Nikola Perković ◽  
Tomislav Poršinsky ◽  
Andreja Đuka ◽  
Matija Bakarić ◽  
...  
Keyword(s):  
Timber Harvesting

Rad se bavi prikazom metode izračuna planskih cijena pridobivanja drva, koje su predmet javnih nadmetanja u Šumsko gospodarskom društvu »Hercegbosanske šume« d.o.o. Kupres te analizom odstupanja planskih od ugovorenih/ostvarenih cijena usluga pridobivanja drva za 97 grupa odjela, koji su bili predmet javnih natječaja u 2019. i 2020. godini. Deskriptivnom i korelacijskom statističkom analizom obuhvaćeni su i pokazatelji grupa odjela na javnim natječajima: površina, neto obujam doznačenog drva, sječna gustoća, broj doznačenih stabala po ha, obujam srednjeg doznačenog stabla, nagib terena, srednja udaljenost privlačenja drva, stjenovitost terena i privlačenje drva uz nagib terena. Test zavisnih parova podataka je ukazao da postoji statistički značajna razlika između planskih i ugovorenih cijena usluga pridobivanja drva (t = 7,78, p < 0,001), a rezultati korelacijske analize potvrdili povezanost utjecajnih čimbenika izvođenja šumskih radova s ugovorenom i planskom cijenom pridobivanja drva. Uslijed statistički značajne (p < 0,05) i vrlo jake korelacije natječajima ostvarene i prikazanom metodom izračunate planske cijene usluge pridobivanja drva, ovisnost je izjednačena linearnim regresijskim modelom uz koeficijent determinacije od 0,667. Navedenim, prikazana je metoda izračuna planske cijene usluge pridobivanja drva dobar prediktor ostvarenih cijena pridobivanja drva na javnim natječajima, što govori i o samoj dobroti prikazane metode izračuna. Slaba i negativna korelacija (p < 0,05, r = -0,22) razlike ugovorene i planske cijene usluge pridobivanja drva o obujmu srednjeg doznačenog stabla, ukazala je da bi ovu pojavu u budućnosti trebalo pratiti s ciljem utvrđivanja uzroka, koji mogu biti: 1) međusobna konkurencija između izvoditelja usluga pridobivanja drva za grupe odjela sa većim srednjim obujmom doznačenoga stabla ili 2) precjenjivanje obujma srednjeg doznačenog stabla u prikazanome modelu izračuna planske cijene pridobivanja drva. Predložene su i smjernice povećanja točnosti određivanja ulaznih parametara (srednja udaljenost privlačenja drva, nagib i stjenovitost terena te privlačenje drva uz nagib terena) prikazane metode izračuna planskih cijena pridobivanja drva u cilju njenog usavršavanja. S obzirom da je izračun vezan za srednju plansku cijenu na razini šumskog gospodarstva, a koju utvrđuje uprava trgovačkog društva, neophodno je stalno praćenje tržišta, kako bi se na vrijeme moglo reagirati ukoliko bi došlo do većih oscilacija.

Green Woods Model: a forecasting tool for planning timber harvesting and protection of spruce-fir forests attacked by the spruce budworm.

1985 ◽  
Author(s):  
Robert S. Seymour ◽  
Gordon D. Mott ◽  
Steven M. Kleinschmidt ◽  
Peter Triandafillou ◽  
Robert Keane
Keyword(s):  
Spruce Budworm ◽  
Timber Harvesting

Vom Forst zum Wald. Entwicklungstendenzen im naturnahen Waldbau | From a Production-Oriented Forest to a Multipurpose Forest. New Trends in Near-Natural Silviculture

1999 ◽  
Vol 150 (12) ◽  
pp. 484-488 ◽  
Author(s):  
Wolf Hockenjos
Keyword(s):  
Forest Management ◽  
Timber Harvest ◽  
Timber Harvesting ◽  
Natural Forest ◽  
The Other ◽  
Private Forest ◽  
Wide Spread ◽  
Great Demand ◽  
The Past ◽  
Forest Enterprises

Concepts of near-natural forestry are in great demand these days. Most German forest administrations and private forest enterprises attach great importance to being as «near-natural» as possible. This should allow them to make the most of biological rationalisation. The concept of near-natural forestry is widely accepted, especially by conservationists. However, it is much too early to analyse how successful near-natural forestry has been to date, and therefore to decide whether an era of genuine near-natural forest management has really begun. Despite wide-spread recognition, near-natural forestry is jeopardised by mechanised timber harvesting, and particularly by the large-timber harvester. The risk is that machines, which are currently just one element of the timber harvest will gain in importance and gradually become the decisive element. The forest would then be forced to meet the needs of machinery, not the other way round. Forests would consequently become so inhospitable that they would bear no resemblance to the sylvan image conjured up by potential visitors. This could mean taking a huge step backwards: from a near-natural forest to a forest dominated by machinery. The model of multipurpose forest management would become less viable, and the forest would become divided into areas for production, and separate areas for recreation and ecology. The consequences of technical intervention need to be carefully considered, if near-natural forestry is not to become a thing of the past.

Resources provision of woodworking industries in Ukraine: cross-national and inter-regional comparisons

2019 ◽  
pp. 145-154
Author(s):  
Svitlana Ishchuk ◽  
Lyubomyr Sozanskyy
Keyword(s):  
Raw Materials ◽  
Dynamic Assessment ◽  
Timber Harvesting ◽  
Necessary Condition ◽  
The European Union ◽  
Environmental Aspects ◽  
Fuel Wood ◽  
Significant Deterioration ◽  
The Czech Republic ◽  
Wood Processing

Sufficient supply of woodworking with raw materials while preserving the ecology and rational use of wood is a necessary condition for the functioning of the woodworking industry as one of the key segments of the national economy. The issue is of particular importance given the deepening of world integration processes and the introduction of a moratorium on timber exports from Ukraine. It actualizes the study of the state and dynamics of the formation of raw materials potential of domestic woodworks. The purpose of the article is a structural and dynamic assessment of the economic and environmental aspects of formation of the resource potential of Ukrainian woodworks in comparison with the countries of the European Union, as well as in the regional section by types of wood. In the structure of merchantable wood harvested in Ukraine, fuel wood share increased by 4.3 pp. during 2011-2016, whereas in 2017 it increased by 3.8 pp. compared to 2016 and amounted to 61.4%. Unlike in Ukraine, in the vast majority of EU countries business timber is the basis of the structure of harvested merchantable timber. Thus, in the neighboring countries with similar forest landscape – Poland and the Czech Republic – the share of fuel wood in 2017 was 11.6% and 12.3%, in Slovakia – only 6.3%, and in the EU as a whole – 23. 2%. Hence, the significant deterioration of the structure of the harvested merchantable timber in Ukraine can be interpreted as a threat to environmental, and therefore to national security. On the other hand, the results of the assessments revealed an increase in the volume of commercial timber harvesting in Ukraine (in 18 regions) in 2018, as well as in the level of forest reproduction in the leading regions from the harvesting of merchantable timber (Zhytomyr, Kyiv and Rivne regions) and a decrease in the death rate. The restoration of the logical patterns between the dynamics of the loss of stands and the harvesting of commercial and fuel wood are signs of the beginning of positive tendencies in ensuring the preservation and rationalization of raw potential of domestic woodworks and, at the same time, improving the conditions for deepening the level of wood processing. Further authors’ research in this area will be devoted to the search for effective forms of wood industry development in Ukraine, in particular in the Western region.

ArcheoIogIcaI Survey of 1993-1994 Timber Harvesting Areas, Longhorn Army Ammunition Plant, Harrison County, Texas.

1995 ◽  
Author(s):  
Maynard B. Cliff ◽  
Steven M. Hunt ◽  
Floyd Kent ◽  
Melissa M. Green ◽  
Duane E. Peter
Keyword(s):  
Timber Harvesting ◽  
Longhorn Army Ammunition Plant

scholarly journals Private Forests in Nepal: Status and Policy Analysis

2017 ◽  
Vol 15 (1) ◽  
pp. 120-130 ◽  
Author(s):  
Swoyambhu M. Amatya ◽  
Prakash Lamsal
Keyword(s):  
Present Status ◽  
National Level ◽  
Timber Harvesting ◽  
Lessons Learned ◽  
Private Land ◽  
Private Forest ◽  
Community Forest ◽  
Private Forest Owners ◽  
Forest Owners ◽  
Private Forests

 This paper reviews and analyses the present status of private forests and tenure administration in light of existing legal, policy, and regulatory frameworks in Nepal. Additionally, the present status of private forests, as well as the scenarios of timber harvesting, transportation, marketing, and their administration are thoroughly revised. Provisions regarding forests and trees on private land and their basis are examined and implications are articulated for potential policy improvements for enhanced tenure security. It is shown that robust national-level policies and legal frameworks exist, and that there is an increasing trend of timber flows to markets from private forests over the past five years. However, there is still skepticism, mistrust and fear amongst private forest owners, saw millers, and forest administration that prevents the full use of the bundle of rights that legal and policy provisions have promised. An unusually slow pace of private forest registration, lengthy and multi stage processes for obtaining harvesting and transportation permits, and official bans on important commercial species, among others, are found to be the factors that most hinder the private forest owners’ and tree growers’ interests, and their rights and obligations with respect to the management and use of their private forest resources. It is concluded that a simplified permitting process along with programmatic support would promote and help to grow private forestry and that Nepal’s experience and lessons learned from community forest implementation would be a great asset to move towards this end. Connecting community forest user groups for organised and cooperative action, and mobilising their institutional strength and accumulated funds for pro-farmer technical and regulatory support would allow farmers to intensify tree plantations and forest management. Further steps are required to convince policymakers and secure necessary budgetary support to this end..

Designing Timber Harvesting to Enhance New Zealand Falcon Populations

2021 ◽  
Vol 85 (3) ◽  
pp. 556-568
Author(s):  
Chifuyu Horikoshi ◽  
Phil F. Battley ◽  
Edward O. Minot
Keyword(s):  
New Zealand ◽  
Timber Harvesting

scholarly journals Legacy of Human Impact on Geomorphic Processes in Mountain Headwater Streams in the Perspective of European Cultural Landscapes

Geosciences ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 253
Author(s):  
Tomáš Galia
Keyword(s):  
Human Impact ◽  
Cultural Landscapes ◽  
Headwater Streams ◽  
Timber Harvesting ◽  
Anthropogenic Pressure ◽  
Catchment Scale ◽  
Morphological Response ◽  
Mountain Ranges ◽  
Outer Western Carpathians ◽  
Geomorphic Processes

Mountain headwater streams are still somewhat on the boundary of interest regarding possible human impact on their morphology or geomorphic processes, which may be caused by our perception of mountains as islands of relatively preserved natural conditions. This paper summarizes the past and present human pressure on the headwater streams that drain the highest mountain ranges of the Outer Western Carpathians in Czechia. Anthropogenic pressure began in this region in the 16th century during a colonization of the mountains and continued by timber harvesting, timber floating, and construction of torrent control works until present. Each of these interventions produced a morphological response of the channels in relation to altered sediment or water fluxes at the whole catchment scale or within longitudinal stream profiles. Because it is highly unlikely to reach pre-settlement conditions of the channels, the management effort should be concentrated to achieve realistic restoration targets under the present socioeconomic circumstances by taking into consideration the morphodynamical specifics of mountain headwater streams.

Effects of harvesting on fine root biomass and decomposition in an Engelmann spruce – subalpine fir forest

2003 ◽  
Vol 33 (5) ◽  
pp. 847-853 ◽  
Author(s):  
Sylvia E Welke ◽  
Graeme D Hope ◽  
Gary A Hunt
Keyword(s):  
Root Biomass ◽  
Fine Root ◽  
Timber Harvesting ◽  
High Elevation ◽  
Fine Root Biomass ◽  
Nutrient Concentrations ◽  
Root Dynamics ◽  
Subalpine Fir ◽  
Root Longevity ◽  
Engelmann Spruce

The effect of timber harvesting on the biomass, nutrient standing crop, and decomposition of fine roots (<2 mm) was studied in a high elevation, Engelmann spruce (Picea engelmannii Parry ex Engelm.) – subalpine fir (Abies lasiocarpa (Hook.) Nutt.) forest. Root dynamics were compared in openings of different sizes. The sequential core method was used to collect fine root samples over 4 years. Differences in fine root biomass between opening sizes were most significant for the active fine root portion and were most pronounced in the fall compared with the spring. Active fine root biomass was significantly lower in the 10-ha clearcuts (164 kg/ha) compared with control plots (275 kg/ha). Furthermore, active fine root biomass was often lower in the 1.0-ha opening than in the 0.1-ha and control plots. A similar trend was established for inactive fine root biomass, although this was not consistent over sampling years. Nutrient concentrations of K, but no other elements, were higher in control plots. Nutrient standing crops, however, followed trends observed in fine root biomass. In the 10-ha clearcuts, the largest changes in fine root biomass occurred at the edge of the opening. The findings suggest that small (<10 ha) cutblocks may maintain greater fine root longevity.

scholarly journals Projected decrease in wintertime bearing capacity on different forest and soil types in Finland under a warming climate

2019 ◽  
Vol 23 (3) ◽  
pp. 1611-1631 ◽  
Author(s):  
Ilari Lehtonen ◽  
Ari Venäläinen ◽  
Matti Kämäräinen ◽  
Antti Asikainen ◽  
Juha Laitila ◽  
...  
Keyword(s):  
Bearing Capacity ◽  
21St Century ◽  
Climate Model ◽  
Thick Layer ◽  
Timber Harvesting ◽  
Snow Accumulation ◽  
Point Of View ◽  
Frozen Soil ◽  
Soil Types ◽  
Soil Frost

Abstract. Trafficability in forest terrain is controlled by ground-bearing capacity, which is crucial from the timber harvesting point of view. In winter, soil frost affects the most the bearing capacity, especially on peatland soils which have in general low bearing capacity. Ground frost similarly affects the bearing capacity of forest truck roads. A 20 cm thick layer of frozen soil or 40 cm thick layer of snow on the ground may already be sufficient for heavy forest harvesters. In this work, we studied the impacts of climate change on soil frost conditions and, consequently, on ground-bearing capacity from the timber harvesting point of view. The number of days with good wintertime bearing capacity was modelled by using a soil temperature model with a snow accumulation model and wide set of downscaled climate model data until the end of the 21st century. The model was calibrated for different forest and soil types. The results show that by the mid-21st century, the conditions with good bearing capacity will decrease in wintertime in Finland, most likely by about 1 month. The decrease in soil frost and wintertime bearing capacity will be more pronounced during the latter half of the century, when drained peatlands may virtually lack soil frost in most of winters in southern and western Finland. The projected decrease in the bearing capacity, accompanied with increasing demand for wood harvesting from drained peatlands, induces a clear need for the development of sustainable and resource-efficient logging practices for drained peatlands. This is also needed to avoid unnecessary harvesting damages, like rut formation on soils and damage to tree roots and stems.

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