scholarly journals Holzerntepotenzial im Schweizer Wald: Simulation von Bewirtschaftungsszenarien

2016 ◽  
Vol 167 (3) ◽  
pp. 152-161 ◽  
Author(s):  
Golo Stadelmann ◽  
Anne Herold ◽  
Markus Didion ◽  
Beatriz Vidondo ◽  
Andres Gomez ◽  
...  
Keyword(s):  
Bark Beetles ◽  
Management Strategies ◽  
Timber Harvesting ◽  
Decision Makers ◽  
High Demand ◽  
Management Scenarios ◽  
Growing Stock ◽  
Alpine Regions ◽  
Base Scenario ◽  
Harvesting Costs

Timber-harvesting potential of Swiss forests: simulation of management scenarios Growing stock in Swiss forests has, during the past 10 years, increased by 3% overall, with large regional variation. The increase in Alpine regions has been considerable, while growing stock has decreased on the Plateau. We simulated 5 different 100-year management scenarios with the forest development model Massimo. In the base scenario “constant growing stock”, 7.7 million m3 of merchantable timber could be harvesting annually. In the scenario “increasing growing stock”, the harvesting potential was lower (6.3 million m3), but it was higher in the scenarios “continually high increment” (7.8 million m3), “high demand for coniferous timber“ (8.5 million m3) and “high demand for wood fuel or chemical timber” (8.1 million m3). With time, timber-harvesting costs increase for all scenarios, with the least increase for the base scenario. If the prevailing management system continues (scenario “increasing growing stock”), stands will become denser and growing stock increase, with the risk of more disturbances, e.g. wind, snow-breakage, or bark beetles. In the Plateau, however, the regional overuse of recent decades could limit the overall timber-harvesting potential. In Alpine regions, stabilizing growing stock (scenario “constant growing stock”) could improve the resistance of forests, but the harvesting costs per cubic meter might be higher. These management scenarios provide decision makers with indications of how particular forest management strategies could affect the development of growing stock, harvesting amounts and costs.

scholarly journals Nachhaltiges Holzproduktionspotenzial im Schweizer Wald

2011 ◽  
Vol 162 (9) ◽  
pp. 300-311 ◽  
Author(s):  
Edgar Kaufmann
Keyword(s):  
Forest Management ◽  
Management Strategies ◽  
National Forest Inventory ◽  
Forest Area ◽  
Long Term Effects ◽  
Growing Stock ◽  
Rotation Periods ◽  
The Impact ◽  
Harvesting Costs

Potential of sustainable wood production in Swiss forests In the Swiss National Forest Inventory (NFI), the data collected in the three inventories (NFI1 1983–1985, NFI2 1993–1995, NFI3 2004–2006) provide the basis not only for analysing the present state of the forest and how it has developed up to now, but also for assessing, with the help of models, how it might develop in future. The scenario model «Massimo 3», developed at the Swiss Federal Institut for Forest, Snow and Landscape Research, is an empirical and stochastic simulation model. It relies on data from the NFI and forecasts the development of the forest according to how it is managed. Six scenarios with different management regimes were defined according to the economic, silvicultural and ecological aspects considered. In three scenarios the growing stock is kept constant at the level of NFI3, but different management strategies are used (Scenario A: basis [business as usual], Scenario E: even-aged forests are transformed into uneven-aged forests, and Scenario F: near-natural percentages of conifers are promoted). In two scenarios forest management is partially abandoned for either ecological reasons (Scenario B: reservations, 10% of the forest area is left unmanaged) or for economic reasons (Scenario C: harvesting costs, 40% of the forest area is left unmanaged). Scenario D (rotation periods are shortened) was used to study the effects of augmenting the annual harvesting amount. A forecasting time period of 100 years was selected to assess the long-term effects of the scenarios. Scenarios A, D, and E show that the sustainable harvesting potential of merchantable wood lies in a relatively narrow range of 7.1 to 7.3 million m3/year, even though in Scenario D the growing stock is reduced from 360 m3/ha to 305 m3/ha. In Scenario F regeneration is systematically established with near-natural percentages of conifers, the long-term harvesting potential is slightly less: about 6.5 million m3/year of merchantable wood. If forest management is abandoned for economic reasons on as much as 40% of the forest area (Scenario C, harvesting costs), the impact on the wood reserves is very negative.

scholarly journals Ertragskundliche Leistung in den Plenterwald-Versuchsflächen der Schweiz | Yield performance in the plenter forest research plots in Switzerland

2009 ◽  
Vol 160 (6) ◽  
pp. 162-174 ◽  
Author(s):  
Andreas Zingg ◽  
Fritz Frutig ◽  
Anton Bürgi ◽  
Renato Lemm ◽  
Vinzenz Erni ◽  
...  
Keyword(s):  
Growth Parameters ◽  
Basal Area ◽  
High Volume ◽  
Timber Harvesting ◽  
Growth And Yield ◽  
Silver Fir ◽  
Forest Research ◽  
Growing Stock ◽  
The Future ◽  
Harvesting Costs

22 plenter forest research plots, some of which are under long-term observation, allow the assessment of the performance of these stands and to a certain extent these performances can also be compared with the perfor mances of other management systems. The performance descriptions presented here are in a broad sense of the term growth and yield: the pure growth parameters for four selected areas are complemented by a modelling of the economic results by determination of the timber harvesting costs and the revenues. Young forest surveys were also made in four areas and thus allow us a glimpse into the future development. Most of the areas presented here lie in the silver fir - beech belt, some in the upper montane and in the subalpine zone and only one in a stand rich of broad-leaved trees. An equilibrium model can be calculated for most of these stands. The high altitude areas, two stands with high volume retention and conversion stands were exceptions. These areas showed high fluctuations in the growing stock. In contrast the increment remains the same over a large range of the growing stock. Utilization and increment are on the average in a similar magnitude. Standing volume and heavy timber proportions are lower in higher altitudes due to site conditions. The modelled revenues after deducting harvesting costs can be partly correlated with the diameter of the mean basal area tree of the harvested logs. Based on the stem number distribution from the one year old plant to the thickest tree, the sustainability of the forest effects – timber extraction or protection – for four areas is assured in the future. It can be shown with this data that the big advantage of selection forests lays in the regularity of these performances and this also on small areas.

scholarly journals Morphometric analysis and prioritization of upper Benue River watershed, Northern Nigeria

2021 ◽  
Vol 11 (2) ◽  
Author(s):  
Caleb Akoji Odiji ◽  
Olaide Monsor Aderoju ◽  
Joseph Bisong Eta ◽  
Idris Shehu ◽  
Adama Mai-Bukar ◽  
...  
Keyword(s):  
Management Strategies ◽  
Decision Makers ◽  
Order System ◽  
Hydrological Process ◽  
Drainage Pattern ◽  
River Watershed ◽  
Digital Elevation ◽  
Hypsometric Integral ◽  
Cumulative Length ◽  
Elevation Model

AbstractThe upper Benue River watershed is undergoing remarkable modifications due to man-made and natural phenomena. Hence, an evaluation is required to understand the hydrological process of the watershed for planning and management strategies. This study aimed to assess the morphometric characteristics and prioritize the upper Benue River watershed. The boundary of the watershed and sub-watersheds, as well as stream networks, was extracted from the digital elevation model (DEM) coupled with hydrological and topographic maps. Twenty-eight morphometric parameters under three categories, i.e. linear, areal, and relief aspects were computed and mapped. Findings from the study revealed that the watershed is a seventh stream order system characterized by a dendritic drainage pattern. The result also showed that 4821 streams were extracted with a cumulative length of 30,232.84 km. The hypsometric integral of the watershed was estimated to be 0.22, indicating that it is in the old stage. In the prioritization of the watershed, the morphometric variables were utilized to calculate and classify the compound factor. The result showed that sub-watersheds 12, 16, 18, 24, 26, and 27 were ranked as very high priority for which conservation measures are required to mitigate the risk of flood and erosion. The outcome of this study can be used by decision-makers for sustainable watershed management and planning.

scholarly journals Partizipative Erarbeitung von Bewirtschaftungsszenarien für den Tessiner Kastaniengürtel

2018 ◽  
Vol 169 (1) ◽  
pp. 18-25
Author(s):  
Francesca Cellina ◽  
Luca Pampuri ◽  
Marco Conedera ◽  
Davide Bettelini ◽  
Rudy Genazzi ◽  
...  
Keyword(s):  
Forest Management ◽  
Interest Groups ◽  
Participatory Design ◽  
Management Strategies ◽  
Additional Benefit ◽  
Forest Planning ◽  
Management Scenarios ◽  
Management Schemes ◽  
Near Future ◽  
Current Guidelines

Participatory design of management scenarios for the Ticino chestnut belt Current guidelines for forest management ask for multi-functional management schemes, allowing a balance between different forest functions, such as production, protection, recreation and ecology. This requires adoption of multi-criteria processes for forest planning. In such a framework, involving stakeholders from the very beginning of the process might be an additional benefit: it would allow to identify possible broadly accepted forest management strategies, thus facilitating their implementation. In this paper, we present the methodologies and tools we developed between 2013 and 2016, in a process aimed at designing and assessing management scenarios for the chestnut belt forests in the Canton of Ticino (Switzerland). Structured and transparent comparison among the scenarios allowed around twenty representatives of cantonal offices and interest groups to make rational and informed choices, leading to the identification of two low-conflict, compromise management scenarios to be implemented in the near future.

scholarly journals Interbasin water transfer in a changing world: A new conceptual model

2021 ◽  
pp. 030913332110650
Author(s):  
Edward Rollason ◽  
Pammi Sinha ◽  
Louise J Bracken
Keyword(s):  
Water Scarcity ◽  
Conceptual Models ◽  
Management Strategies ◽  
Temporal Distribution ◽  
Water Transfer ◽  
Decision Makers ◽  
Global Issue ◽  
Proposed Model ◽  
Interbasin Water Transfer ◽  
Water Scarce

Water scarcity is a global issue, affecting in excess of four billion people. Interbasin Water Transfer (IBWT) is an established method for increasing water supply by transferring excess water from one catchment to another, water-scarce catchment. The implementation of IBWT peaked in the 1980s and was accompanied by a robust academic debate of its impacts. A recent resurgence in the popularity of IBWT, and particularly the promotion of mega-scale schemes, warrants revisiting this technology. This paper provides an updated review, building on previously published work, but also incorporates learning from schemes developed since the 1980s. We examine the spatial and temporal distribution of schemes and their drivers, review the arguments for and against the implementation of IBWT schemes and examine conceptual models for assessing IBWT schemes. Our analysis suggests that IBWT is growing in popularity as a supply-side solution for water scarcity and is likely to represent a key tool for water managers into the future. However, we argue that IBWT cannot continue to be delivered through current approaches, which prioritise water-centric policies and practices at the expense of social and environmental concerns. We critically examine the Socio-Ecological Systems and Water-Energy-Food (WEF) Nexus models as new conceptual models for conceptualising and assessing IBWT. We conclude that neither model offers a comprehensive solution. Instead, we propose an enhanced WEF model (eWEF) to facilitate a more holistic assessment of how these mega-scale engineering interventions are integrated into water management strategies. The proposed model will help water managers, decision-makers, IBWT funders and communities create more sustainable IBWT schemes.

scholarly journals Integrating local social-ecological knowledge to prioritise invasive species management

2018 ◽  
Author(s):  
Hernán Cáceres-Escobar ◽  
Katrina J Davis ◽  
Scott C Atkinson ◽  
Hugh P Possingham ◽  
Salit Kark
Keyword(s):  
Invasive Species ◽  
Local Knowledge ◽  
Management Strategies ◽  
Well Being ◽  
Local Economy ◽  
Ecological Knowledge ◽  
Invasive Species Management ◽  
Management Scenarios ◽  
Red Foxes ◽  
Species Management

There is a lot of uncertainty about how we pick the best invasive species management strategies to improve the environment, local economy, and human well-being, as invasive species management involves complex and multidimensional challenges. Invasive species management on inhabited islands is especially challenging, often due to perceived socio-political risks and unexpected technical difficulties. Failing to incorporate local knowledge and local perspectives in the early stages of planning can compromise the ability of decision-makers to achieve long-lasting conservation outcomes. Hence, including local knowledge and accounting for subjective stakeholder perceptions is essential for invasive species management, yet this often remains unaddressed. To address this gap, we present an application of invasive species management based on structured decision-making, and the resource allocation tool INFFER, on Minjerribah-North Stradbroke Island (Australia). We assessed the cost-effectiveness of six management scenarios, co-developed with local land managers and community groups, aimed at preserving the environmental and cultural significance of the island by eradicating European red foxes and feral cats. We further conducted a survey eliciting local stakeholders’ perspectives regarding the significance of the Island, their perception of the benefits of the proposed management scenarios, funding requirements, technical feasibility of implementation, and socio-political risk. We found that the best decisions when the budget is low are less cost-effective than when the budget is high. The best strategy focusses on control of European red fox on Minjerribah. However, our results also highlight the need for more research on feral cat management. This work demonstrates how to use a structured decision support tool, like INFFER, to assess contesting management strategies, this is particularly important when stakeholders’ perceptions regarding management outcomes are heterogeneous and uncertain.

Assessing forest management strategies under a mountain pine beetle attack in Alberta: exploring the impacts

2010 ◽  
Vol 40 (4) ◽  
pp. 597-610 ◽  
Author(s):  
Anne-Hélène Mathey ◽  
Harry Nelson
Keyword(s):  
Forest Management ◽  
Mountain Pine Beetle ◽  
Management Strategies ◽  
Timber Supply ◽  
Growing Stock ◽  
Management Objectives ◽  
Mountain Pine ◽  
Resource Managers ◽  
Recourse Approach ◽  
Pine Beetle

We explore how forest resource managers can respond to a potential outbreak of mountain pine beetle ( Dendroctonus ponderosae Hopkins, 1902) by assessing how well different forest management strategies achieve various management objectives over time. Strategies include targeting at-risk stands as well as increasing harvest levels. Outcomes are evaluated on the basis of volume flows, net revenues, and the age class structure of the ending inventory. We use a spatially and temporally explicit model to simulate forest management outcomes and consider two different scenarios, one in which the attack occurs early and one where it is delayed. The model utilizes a planning with recourse approach in which the firm can reevaluate its harvesting schedule following the attack. We use company data from west-central Alberta for a 40-year planning exercise. The timing of the attack resulted in small differences in timber supply. However, most strategies performed better financially under an early attack, which limits the harvest of marginal stands. Increasing harvest levels performed better in economic terms but resulted in a very young growing stock with little old forest. The success of any strategy is linked to the timing of the attack and how it affects the growing stock, subsequently impacting timber and revenue flows.

Predicting Logging Residue Volumes in Alaska

2021 ◽  
Vol 67 (2) ◽  
pp. 119-124
Author(s):  
Erik C Berg ◽  
Eric A Simmons ◽  
Todd A Morgan ◽  
Stanley J Zarnoch
Keyword(s):  
Predictive Models ◽  
Tree Species ◽  
Timber Harvesting ◽  
Individual Tree ◽  
Growing Stock ◽  
Prediction Tools ◽  
Breast Height ◽  
Logging Residue ◽  
The Creation ◽  
Forest Managers

Abstract Alaska forest managers seek information on how timber harvesting practices change the creation of postharvest woody residues. To predict residue volumes, researchers investigated how residue ratios—growing-stock residue volume per mill-delivered volume—related to readily available data on logging site and tree attributes in Alaska. Residue ratios were not related to logging site-level variables but were related to individual tree variables with predictive models. Ratios varied widely by tree species and were predicted to increase with larger stump height and larger small-end used diameters and decline exponentially with increasing diameter breast height (dbh) to approximately 25 inches. Ratios were then predicted to increase progressively in larger dbh trees. Results from this study update previous findings in other US Northwest states and can be used to produce or improve residue prediction tools for Alaska land managers.

Tree Size and Species, Stand Volume, and Tract Size: Effects on Southern Harvesting Costs

1989 ◽  
Vol 13 (3) ◽  
pp. 145-152 ◽  
Author(s):  
Frederick W. Cubbage ◽  
W. Dale Greene ◽  
John P. Lyon
Keyword(s):  
Tree Species ◽  
Size Effects ◽  
Timber Harvesting ◽  
Tree Size ◽  
Labor Costs ◽  
Production Rates ◽  
Stand Volume ◽  
Factors Affecting ◽  
Harvesting Costs ◽  
Significant Factors

Abstract Timber harvesting production rates and equipment and labor costs were used to estimate average logging costs for a variety of tract volumes and sizes, stand structures, and tree species. Average costs were estimated for conventional logging systems typical in the South. Regression analysiswas used to identify significant factors affecting the costs for each system. Highly mechanized systems were generally cheapest for harvesting southern pines, but were not much cheaper for harvesting hardwoods. Hardwoods were substantially more expensive to harvest, as were tracts of lessthan 250 cords in total volume. South. J. Appl. For. 13(3):145-152.

scholarly journals Toward Decision-Making Support: Valuation and Mapping of New Management Scenarios for Tunisian Cork Oak Forests

Forests ◽  
2020 ◽  
Vol 11 (2) ◽  
pp. 197
Author(s):  
Mariem Khalfaoui ◽  
Hamed Daly-Hassen ◽  
Boutheina Stiti ◽  
Sihem Jebari
Keyword(s):  
Decision Making ◽  
Spatial Distribution ◽  
Ecosystem Services ◽  
Economic Value ◽  
Cork Oak ◽  
Decision Makers ◽  
Management Scenarios ◽  
Density Decrease ◽  
Mediterranean Countries ◽  
The Impact

Forest ecosystems are an important anthropogenic pillar to human wellbeing, providing a multitude of ecosystem services. In Mediterranean countries, where climate change effects are exponentially increasing, the value of the forest ecosystem services is even higher and their preservation is more crucial. However, the biophysical and economic value of such services is usually not observable due to their non-marketable characteristics, leading to their underestimation by decision-makers. This paper aims to guide decision-making through a set of new management scenarios based on ecosystem services’ values and their spatial distribution. It is a cumulative multidisciplinary study based on biophysical models results, economically valued and implemented using the geographic information system (GIS) to analyze spatial data. The investigation was based on a biophysical and economic valuation of cork, grazing, carbon sequestration and sediment retention as a selection of ecosystem services provided by cork oak forest (Ain Snoussi, Tunisia). The valuation was made for the actual situation and two management scenarios (density decrease and afforestation of the shrub land), with emphasis on their spatial distribution as a basis to new management. The total economic value (TEV) of the investigated services provided by Ain Snoussi forest (3787 ha) was €0.55 million/year corresponding to €194/ha/year. The assessment of two different scenarios based on the land cover changes showed that the afforestation scenario provided the highest TEV with €0.68 million/year and an average of €217/ha, while the density decrease scenario provided €0.54 million/year and an average of €191/ha. Such results may orient decision-makers about the impact new management may have, however they should be applied with caution and wariness due to the importance of the spatial dimension in this study.

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