Thomas Ledermann

Thomas Ledermann
Federal Research and Training Centre for Forests, Natural Hazards and Landscape · Forest growth and silviculture

About

34
Publications
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Introduction

Publications

Publications (34)
Article
Full-text available
We present the results of a simulation experiment that evaluated three scenarios of forest management in the context of climate change mitigation. Two scenarios refer to climate change adaptation measures. The third scenario was a business-as-usual scenario representing the continuation of current forest management. We wanted to know whether a chan...
Article
Full-text available
Question: We compared the soil organic carbon stock of the forests of an entire country. The objective of our research was establishing the differences between coniferous or deciduous forests with respect to soil carbon stocks. The question is relevant because coniferous forests are increasingly damaged by abiotic and biotic disturbances that are r...
Article
Full-text available
The current state of research shows that there is big potential for the use of wood, particularly harvested wood products (HWP) to mitigate climate change and increase carbon stocks. Despite of discussions on different accounting approaches, the forest-based sector can contribute with the production of long-lasting wood products to reach internatio...
Method
Full-text available
This annex cotnains the methodological tools (full questionnaire and semi structured guidelines) to the paper (it is as well publically available under the existing DOI).
Technical Report
Full-text available
Adaptation for carbon efficient forests and the entire wood value chain (including a policy decision support tool) - Evaluating pathways supporting the Paris Agreement
Presentation
ValoFor: Small Forests - Big Players, Valorizing small scale forestry for a bio-based economy. A ForestValue research project.
Article
Full-text available
We simulated Austrian forests under different sustainable management scenarios. A reference scenario was compared to scenarios focusing on the provision of bioenergy, enhancing the delivery of wood products, and reduced harvesting rates. The standing stock of the stem biomass, carbon in stems, and the soil carbon pool were calculated for the period...
Chapter
In this chapter we provide an overview of the Austrian forest growth simulators PROGNAUS and CALDIS which have successfully been applied in wood and biomass supply studies. The description of the growth simulators refers to model concept, source of parameterization data, and model implementation (software). We also describe three simulation studies...
Article
Anthropogenic GHG emissions add a fast reinforcing feedback cycle to global carbon dynamics which continues to influence GHG concentrations in the Earth’s atmosphere. When looking at forest carbon cycles there is potential in utilizing another feedback cycle, namely the carbon cycle involving harvested wood products. To assess the potential of the...
Technical Report
Full-text available
Die Holznutzung im österreichischen Wald wirkt sich besonders durch den Effekt der vermiedenen Emissionen von Substitutionsprodukten außerordentlich positiv auf die THG-Bilanz aus. Vorratsänderungen in der Waldbiomasse und im Waldboden spielen eine wichtige Rolle in der THG-Bilanz. Eine kaskadische Holzverwendung, wo immer möglich, ist für die THG-...
Article
Although they were originally introduced for different purposes, forest models are often used today for scenario development, which includes forest production as one aspect of forest development. However, studies using an independent data set to compare different simulators are rarely found. In this study a subset of National Forest Inventory data...
Article
Full-text available
All indices of competition represent effects of distance between competing trees. However, the functional forms of these distance relations differ, because distance interacts with tree size in the many of the indices. In particular, some of the newer indices use vertical angles and crown geometry to define the effect of separation implicitly. Graph...
Article
In this study, a non-linear model was developed that predicts the five-year change of height to crown base (HCB) of Norway spruce (Picea abies [L.] Karst.). Data were available from the Austrian National Forest Inventory and comprised 2,419 trees from 1,637 permanent sample plots measured during 1981 and 2002. The dynamic model explained 36% of the...
Article
Recent individual-tree growth models use either distance-dependent or distance-independent competition measures to predict tree increment. However, both measures have deficiencies: the latter because the effects of local variation in spacing are not represented, and the former because they cannot be calculated from normal inventory data for lack of...
Article
Full-text available
We illustrate effects of competitor spacing for a new class of individual-tree indices of competition that we call semi-distance-independent. This new class is similar to the class of distance-independent indices except that the index is computed independently at each subsampling plot surrounding a subject tree for which growth is to be modelled. W...
Article
During the last two years a special working group was attended to the development of biomass equations for Austrian forest tree species or groups of tree species. The biomass equations were developed from existing data that were originally collected on long-term thinning experimental plots, in forest decline studies, in studies on the biomass struc...
Article
In plantation forestry, as well as in forests managed according to the single tree selection system (Plenter forest), there are well established methods available to control sustainable management in terms of timber resources. If a shift from even-aged to uneven-aged management is intended, there is usually a lack of a clear, numerically defined ai...
Chapter
Users of forest growth simulators are often faced with specific problems requiring a growth simulator with specific capabilities. Because of the great variety among the existing growth simulators, it is not always an easy endeavour to find an appropriate one. In this situation a standardised description is very helpful. The description of the growt...
Article
Individual tree-growth simulators that are to be used to support decisions in forest management must be able to provide forest growth forecasts for different stand treatments and forest management scenarios as well as giving results in terms of not only cubic metres or biomass, but also commercial assortments, including measures of wood quality. In...
Chapter
In this chapter we demonstrate different management regimes and their impact on commercial timber supply using the individual-tree growth simulator PrognAus for Windows 2.2. We thereby address two frequently discussed scenarios: (1) the conversion of even-aged pure species stands into uneven-aged mixed species stands and (2) how to deal with a fore...
Article
From long-term experimental plots of the Department of Forest Growth and Silviculture of the Federal Research and Training Centre for Forests, Natural Hazards and Landscape (BFW) a total of 8,744 individual-tree based records of five different tree species with complete measurements of diameter (DBH), tree length (TL), crown length (CL), crown widt...
Article
An increasing use of forest sampling and a huge progress in individual-tree growth modelling offered a new field of application for individual-tree growth models: predicting forest growth by updating tree data of individual sample plots. What is usually overlooked by such applications is the fact that the sampling design for collecting the paramete...
Article
Full-text available
Can a tree-specific mortality model elicit expected forest stand density dynamics without imposing stand-level constraints such as Reineke's maximum stand density index (SDI(max)) or the -3/2 power law of self-thinning? We examine this emergent properties question using the Austrian stand simulator PROGNAUS. This simulator was chosen specifically b...
Article
The Basal-Area-in-Larger Trees (BAL) is a measure of competition which is often used in individual-tree growth modelling. However, depending on the inventory design used for sampling the parameterization data, this competition variable is characterized by a specific resolution which has an effect on the model coefficients. If such an individual-tre...
Article
Within the last 10 years, computer simulation software for several individual-tree growth simulators has been developed. Using these simulators, long-term prognoses and scenario analyses for the development of forest stands can be conducted. However, during the growth of forest stands trees have to be removed from the stands for reasons like thinni...
Chapter
A harvesting model for forests in conversion was developed to model tree selection preferences. Data came from a continuous forest inventory of a forest management area, where target diameter harvesting is the preferred management system. The Logit-function was used to model tree selection preferences using maximum likelihood methods for parameter...
Article
All indices of competition represent effects of distance between competing trees. However, the functional forms of these distance relations differ, because distance interacts with tree size in the many of the indices. In particular, some of the newer indices use vertical angles and crown geometry to define the effect of separation implicitly. Graph...
Article
Full-text available
Einleitung und Problemstellung Im Rahmen der Holz-und Biomassenaufkommensstudie für Österreich 1 soll mit Hilfe des Waldwachstums-simulators PROGNAUS (LEDERMANN 2006) eine Zuwachsprognose für die nächsten 20 Jahre durchgeführt werden. In diesem Zusammenhang spielt das Kronenverhältnis (CR) eines Baumes eine wichtige Rolle, da es sowohl in der Zuwac...

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Projects

Projects (2)
Project
To understand the contribution of small forest owners in the transition to a wood based bio-economy by considering the perception and management strategies of small forest owners. This includes analyzing and comparing forest management strategies with respect to the potential timber supply, ecosystem services and forest resilience to climate change. The project will assess small forest owners from southern to northern European forests in Austria, Germany, Sweden, Finland and Slovenia.
Project
CareforParis analyses and quantifies the impacts of climate change and related forest management adaptations on the GHG balance as well as on the economic situation of the entire Austrian forest-based sector. Consequences and required adaptation measures in the Austrian wood industry will be elucidated. In a first step, six climate-sensitive scenarios for forest management will be developed until 2150. Through utilisation of regionalised climate change scenarios, a business-as-usual scenario and four different silvicultural treatment and adaptation scenarios will be defined. These scenarios are the fundament for simulating material and carbon flows for the entire Austrian wood-based value chain for harvested wood products and wood fuel and subsequently conduct life cycle assessments for final wood product/fuel use and the potential use of alternative products/fuels. In a second step, an analysis of potential effects of climate change impact and adaptation measures on the GHG balance as well as economic effects on the entire forest-based sector will be identified. Policy analysis will help to derive policy relevant insights on adaptation and mitigation measures and a future Austrian adaptation strategy. The work will use CareforParis scenario outcomes in a decision support tool for adaptation and GHG optimised mitigation. In the third step, an overall evaluation of the project results will be conducted. The project results will be disseminated to relevant stakeholders and a concise break-down of the results will be made for policy makers as well as for non-researchers/researchers from other disciplines.