"Interactief kappen": Staatsbosbeheer en de maatschappelijke acceptie van houtoogst

In dit essau aandacht voor het vernieuwende natuurbeleid van de kabinetten Rutte I en II, de daaruit voortvloeiende consequenties voor Staatsbosbeheer, de bijgestelde bosbeheervisie van de organisatie en de wijze waarop Nederlandse burgers - gemiddeld genomen - op de kap van bome reageren. Daarna komen vijf gebieden / aandachtspunten aan bod uit het recente verleden en heden van Staatsbosbeheer. Dit zijn: Drents Friese Woud, Heiderijk, Baarnse Bos, Westerkwartier en het project Kap & Verjonging. Directe aanleiding is de interactie tussen Staatsbosbeheer, belangengroepen en burgers, vrom en aand van die interactie, wederzijdse beeldvorming en uiteindelijk het leerproce

Forest biodiversity, carbon sequestration, and wood production: modeling synergies and trade-offs for ten forest landscapes across Europe

Original ResearchEurope’s forests provide vital habitat for biodiversity and essential ecosystem services whose provision must be sustained or enhanced over the coming century. However, the potential to secure or increase forest ecosystem services, while securing the habitat requirements of taxa remains unclear, especially within the context of uncertain climate and socio-economic developments. To tease out the associated trade-offs and synergies, we used 10 case study landscapes within nine countries throughout Europe. Starting with the current status of the forests in the case study landscapes, we simulated forest development 100 years into the future. Simulations were embedded in three combined climate and socio-economic frame scenarios based on global and European policies which varied in their climate change mitigation efficiency. Scenarios were translated into country specific projections of climate variables, and resultant demands for wood products. Forest management regimes were projected to vary in response to these scenarios at local scales. The specific combinations of alternative forest management practices were based on parallel research and input from local forest stakeholders. For each case study, a specific forest growth simulator was used. In general, the climate scenarios applied did not cause fundamentally different ecosystem service outputs at the case study level. Our results revealed almost no reduction in outcomes for biodiversity indicators with an increase in wood production, and in some cases synergistic results occurred when diversity was actively promoted as part of the management concept. Net carbon uptake was not strongly correlated with biodiversity, indicating that biodiversity-friendly forest management doesn’t need to curtail carbon sequestration. Notably, we obtained heterogeneous results for the relation between sustainable wood production and net carbon uptake. Most scenarios resulted in a more or less reduced net carbon uptake over the long term, often due to stand age class distribution shifts. Levels of sustainable wood production varied widely during the simulation period, from significant increases (Sweden, Lithuania) to minor changes (Slovakia, Turkey) and slight decreases (Ireland, Netherlands). We place our results within the larger context of European forest policy and the challenges of simulating and contrasting forest biodiversity and the ecosystem services that societies depend on outcomes for biodiversity indicators with an increase in wood production, and in some cases synergistic results occurred when diversity was actively promoted as part of the management concept. Net carbon uptake was not strongly correlated with biodiversity, indicating that biodiversity-friendly forest management doesn’t need to curtail carbon sequestration. Notably, we obtained heterogeneous results for the relation between sustainable wood production and net carbon uptake. Most scenarios resulted in a more or less reduced net carbon uptake over the long term, often due to stand age class distribution shifts. Levels of sustainable wood production varied widely during the simulation period, from significant increases (Sweden, Lithuania) to minor changes (Slovakia, Turkey) and slight decreases (Ireland, Netherlands). We place our results within the larger context of European forest policy and the challenges of simulating and contrasting forest biodiversity and the ecosystem services that societies depend oninfo:eu-repo/semantics/publishedVersio

Оптимизация конструкции захвата для детали «Барабан»

Грузозахватные приспособления обычно применяются при производстве работ по подъему и перемещению грузов с применением грузоподъемных машин. Использование приспособлений позволяет реализовать максимальное удобство и безопасность производственного процесса. Грузозахватные приспособления конструируются для определенного этапа технологического процесса, для конкретного изделия. При проектировании таких приспособлений необходимо учитывать основные показатели оптимальности конструкции: прочность, надежность, простота, удобство и безопасность при эксплуатации, эргономичность. Кроме того, нужно стремиться к наименьшей массе и, соответственно, металлоемкости захвата. Конструкция грузозахватного приспособления, в основном, будет зависеть от назначенных технологом поверхностей, за которые можно крепиться и от максимальной высоты подъема крюка крана. В статье описана задача по конструированию захвата для детали «Барабан¬ в новом технологическом процессе. Рассмотрена конструкция существующего захвата, взятого за прототип. Приведен анализ различных вариантов конструктивных решений, созданных в процессе проектирования. Выбран вариант конструкции захвата, который в наибольшей степени соответствует требованиям технического задания. Конструкция этого модернизированного приспособления представляет собой захват с тремя лапами, удерживающими деталь, и подвес в виде траверсы. Разработанная конструкторская документация утверждена производством и отделом промышленной безопасности

Rational versus adaptive forest management planning: exploratory research on the strategic planning practices of Dutch forest management organizations

The long-running debate between the rational and the adaptive school of strategic forest management planning has received considerable attention. There is, however, little empirical evidence of whether and how forest management organizations actually plan strategically. The goal of this paper is to fill this empirical gap by describing the strategic planning practices of 22 Dutch forest management organizations faced with uncertain and unpredictable environments. Two characteristics on which the two planning approaches fundamentally differ form the basis of the description of the planning practices. The first characteristic relates to the way the external world is perceived; certainty is essential in the rational model, whereas uncertainty is central in the adaptive model. The second characteristic relates to the way the internal decision process is organized. Rational planning is much more static and stable, whereas adaptive planning processes are much more continuous, dynamic and natural. Interviews with the organizations studied point to a whole range of planning practices. Rational and adaptive planning are merely two ends of a continuum, and planning practices vary along this continuum. The rational–adaptive planning debate can therefore be considered oversimplified as it focuses only on the two extremes and does not incorporate the whole range of possible practices in between these extreme

Community forest enterprises (CFEs) as Social Enterprises: Empirical evidence from Cameroon

Community forest enterprises (CFEs) trade to meet the economic, social, and environmental challenges of their community, just as Social Enterprises (SE) do. The question is if CFEs also could and should be understood in terms of SEs. To explore this question, this study determines the extent to which CFEs can be classified as SEs, using CFEs in Cameroon as a case study. Based on the three-dimensional EMES framework in combination with the typology of SEs of Alter, CFEs are classified along a continuum of purely non-profits, non-profits with income-generating activities, and SEs. Document review, interviews, and focus group discussions with CFE management, youths, women, and indigenous groups in 38 communities were used for data collection and subsequently analyzed. Of the 38 CFEs investigated, only 11% could be defined as SEs, 63% are non-profit organizations with income-generating activities and 26% operate as traditional non-profit organizations. The majority of the CFEs (63%) engage in commercial activities for revenue generation but lack the skills and organizational setup to employ full business approaches coupled with financial discipline and community ownership, which are core values of SEs. Operating as SEs would permit CFEs to be financially and environmentally sustainable and thus they could easily contribute to community development. However, moving CFEs from “non-profits with income generation” to SEs requires (i) a change in mindset, (ii) evaluation and building of community capacity for CFE development, (iii) proper research on tensions and paradoxes with actionable solutions, and (iv) sectorial coordination for CFE development, support, and creation of CFE incubation centers

Complexity of Forest Management: Exploring Perceptions of Dutch Forest Managers

Challenges of contemporary forest management are frequently referred to as complex. This article empirically studies complexity in forest management decision-making. In contrast to what is often assumed in the literature, this article starts by assuming that complexity does not just consist of an external descriptive element, but also depends on how decision-makers perceive the system at hand. This “perceived complexity” determines decision-making. We used a straightforward interpretation of perceived complexity using two criteria: the number of factors considered and the uncertainty perceived about these factors. The results show that Dutch forest managers generally consider forest management decision-making to be complicated (many factors to consider) rather than complex (many uncertain factors to consider). Differences in sources of complexity confirm the individual character of perceived complexity. The factors perceived to be most relevant for decision-making (the forest itself, the organization’s objective, the cost of management, public opinion, national policies and laws, and new scientific insights and ideas) are generally seen as rather certain, although “complexity reduction” may play a role that can adversely affect the quality of decision-making. Additional use of more open-ended, forward-looking methods, such as qualitative foresight tools, might enable addressing uncertainty and complexity, and thereby enhance decision-making in forest management to prepare for increasing complexity in the future

Profitability of silvicultural treatments in logging gaps in the Brazilian Amazon

Many harvested timber species of tropical forests have not been regenerating sufficiently for future cutting cycles, which can demand the application of post-harvesting silvicultural treatments. This study analyzed the profitability of sawnwood produced through four treatments applied on seedlings and saplings naturally present or planted in logging gaps as follows: (1) the standard procedures of reduced-impact logging or control; (2) the tending of the naturally established regeneration; (3) enrichment planting 1 (EP-1); and (4) enrichment planting 2 (EP-2). In EP-1 commercial species were planted in 2-year-old gaps with no logging residuals removal from the gap while in EP-2 seedlings were planted in 1-year-old gaps with logging residuals removal from the gap. The planted timber species in EP-2 had higher financial value and higher growth rates than the timber species planted in EP-1. The experiment was carried out in a certified managed forest in the Eastern Amazon, Brazil. The growth rates of the treated seedlings and saplings were projected in 30 and 60 years from the treatment establishment to simulate sawnwood production. The simulations indicated that, increases of 25 and 50% in growth rates and increases up to 500% in timber prices under annual interest rates of 4 and 6%, the treatments of tending and enrichment planting can be profitable at year 60. These silvicultural treatments, under technological improvements, tend to become financially more profitable, meaning higher financial returns to forest managers and investors. <br/