Jonathan P Sheppard

Jonathan P Sheppard
University of Freiburg | Albert-Ludwigs-Universität Freiburg · Chair of Forest Growth and Dendroecology

Dr. rer. nat.
Akademischer Rat / Assistant Professor

About

36
Publications
14,995
Reads
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430
Citations
Additional affiliations
December 2016 - September 2021
University of Freiburg
Position
  • Post-Doc
October 2012 - November 2016
University of Freiburg
Position
  • Researcher
Education
October 2012 - November 2016
University of Freiburg
Field of study
  • Forest Growth
September 2010 - September 2012
University of Freiburg
Field of study
  • Forest Ecology & Managment
September 2000 - June 2003
University of Portsmouth
Field of study
  • Environmental Science (Hons)

Publications

Publications (36)
Article
Full-text available
This paper presents a method for fitting cylinders into a point cloud, derived from a terrestrial laser-scanned tree. Utilizing high scan quality data as the input, the resulting models describe the branching structure of the tree, capable of detecting branches with a diameter smaller than a centimeter. The cylinders are stored as a hierarchical tre...
Article
Full-text available
Terrestrial laser scanning (TLS) technology is a powerful tool for assessing tree growth based on time series analysis, as it allows a level of scrutiny not achievable using established destructive techniques. We applied TLS technology to 21 wild cherry trees grown in a research plot near Breisach (southern Germany) in order to build quantitative s...
Article
Full-text available
This review provides perspectives and insights of forest researchers from four continents representing a range of geo-regions, with examples from diverse and dynamic use of forest products that are undervalued and often misrepresented. A comprehensive discussion of the subject provides special attention to property, tenancy, public goods and access...
Article
Full-text available
Agroforestry is often discussed as a strategy that can be used both for the adaptation to and the mitigation of climate change effects. The climate of southern Africa is predicted to be severely affected by such changes. With agriculture noted as the continent's largest economic sector, issues such as food security and land degradation are in the f...
Article
Full-text available
Reduced solar radiation brought about by trees on agricultural land can both positively and negatively affect crop growth. For a better understanding of this issue, we aim for an improved simulation of the shade cast by trees in agroforestry systems and a precise estimation of insolation reduction. We present a leaf creation algorithm to generate r...
Article
Full-text available
Agroforestry systems hold potential for wood and tree biomass production without the need of felling trees. Branch wood harvesting provides access to considerable amounts of lignocellulosic biomass while leaving the tree standing. Aiming at alternatives for wood provision, we assessed the actual woody structure of a silvopastoral system in the Afri...
Article
Full-text available
Light is a limiting resource for crops within integrated land use systems especially those including woody perennials. The amount of available light at ground level can be modified by artificially pruning the overstory. Aiming to increase the understanding of light management strategies, we simulated the pruning of wild cherry trees and compared th...
Preprint
Full-text available
Preprint from Chapter 2: Sheppard et al. in Vacik, H.; Hale, M.; Spiecker, H.; Pettenella, D.; Tomé, M. (Eds) 2020: Non-Wood Forest Products in Europe, Ecology and management of mushrooms, tree products, understory plants and animal products. Outcomes of the COST action FP1203 on European NWFPs, BoD, Norderstedt, 416p. ISBN: 978-3-7494-7546-9
Chapter
The recent international policy developments fostering a European bio-economy is gradually increasing the forest owners awareness of the potential of non-wood goods. This potential is related to the multiplicity of resources available and a huge portfolio of potential industrial products that can be derived out of them .In addressing these question...
Poster
Full-text available
Der Bevölkerung im südlichen Afrika stehen enorme Herausforderungen hinsichtlich des sich ändernden Klimas bevor. So stellen die durch den Klimawandel hervorgerufenen Risiken eine massive Bedrohung der ökonomischen, und sozialen Entwicklung der Länder im südlichen Afrika dar und belastet zusätzlich die Ökkosysteme, die durch das ransante Bevölkerun...
Poster
Full-text available
Southern Africa is faced with impacting issues such as climate change, degraded landscapes, food insecurity and other severe economic, social and environmental challenges. Yet, the southern African region presents the opportunity to address these pressing issues by exploiting technological advancements for accurate aboveground biomass estimation of...
Poster
Full-text available
Climate change is already a measurable reality generating significant social, economic and environmental challenges, impacting sustainable development around the globe. The African continent is most vulnerable to the forecasted change in global climate, southern Africa in particular will face severe challenges within the upcoming decades. Innovativ...
Chapter
NWFPs show a variety of connections to the concept of smart, inclusive development in a bioeconomy. However, there is no substantial body of evidence that comprehensively considers NWFPs in the context of a bioeconomy. Based on the knowledge collected in this report, this chapter describes a few examples of the contribution of NWFPs as a basis for...
Book
Full-text available
This management guideline provides information about how to produce valuable timber outside of forests – for example on agricultural land. Such an “Agroforestry” approach provides an opportunity to utilise the full potential of agricultural land both economically and ecologically. However, well-shaped trees for the timber industry don’t grow by...
Poster
Full-text available
New and innovative land use solutions are needed to adapt to a rapidly changing climate and to mitigate the predicted impacts on rural livelihoods. Projected changes to current climate patterns are suggested to severely impact southern Africa in the near future. This may be realised as an increase in drought and flooding events and shifts in rainfa...
Article
Full-text available
Intensive artificial pruning of trees increases the proportion of high-value timber but simultaneously reduces the crown and consequently the capacity to assimilate photosynthates. Here, midterm effects of two intensive pruning treatments, a classical and a selective approach, on radial growth dynamics at different stem heights is comparatively ana...
Presentation
Full-text available
The harvest of most Non-wood forest products (NWFP) within Europe has a long tradition and is commonly part of regional culture. It is common knowledge that forests produce much more than wood. Nevertheless, in the past the silvicultural focus within most European countries has shifted strongly towards a single wood production goal, whereby the sta...
Article
Full-text available
Reforesting Scotland Journal 55, 14-15
Article
Full-text available
Pruning wild cherry (Prunus avium L.) is a common silvicultural practice carried out to produce valuable timber at a veneer wood quality. Sub-optimal pruning treatments can permit un-occluded pruning wounds to develop devaluing decay. The aim of this study is to determine relevant branch, tree and pruning characteristics affecting the occlusion pro...
Conference Paper
Full-text available
Mushrooms have a special position in many cultures where they are used as food, medicine, handicrafts, have special cultural significance as symbols or in rituals and are a motivation for forest recreation. However, there is also a dark side to mushrooms which are also associated with poisoning, decay and death. This dichotomy is reflected in the s...
Technical Report
Full-text available
The production of non-wood forest products (NWFP) can be positively affected by silvicultural practice; a revision of current silvicultural practice can influence increased yields of both direct and indirect NWFP. This document aims to provide an overview of selected management systems employed for the production of NWFP in Europe.
Article
Full-text available
Growing Prunus avium L. within an agroforestry system (AFS) may result in sun damage to cambial tissues on sun-exposed bole faces. There are two periods of risk of damage caused by insolation to exposed tree boles, the summer, when cambial temperatures become too high, or during winter, when the frozen dormant cambium tissue thaws and then rapidly...
Article
Full-text available
Background: The global search for new ways to sequester carbon has already reached agricultural lands. Such land constitutes a major potential carbon sink. The production of high value timber within agroforestry systems can facilitate an in-situ carbon storage function. This is followed by a potential long term ex- situ carbon sink within long last...
Technical Report
Full-text available
The deliverable identify the improvements developed or needed to be developped in order to overcome the possible weaknesses of different MPT and NWFP models. The main body of the deliverable is structured in two chapters. The first part (chapter 2) is focused on those existing models that already present a high degree of development and that were a...
Research
Full-text available
Der Leitfaden "Wertholzproduktion in Agroforst-Systemen" ist für Praktiker geschrieben und erklärt die wichtigsten Planungs- und Arbeitsschritte bei der Anlage und Bewirtschaftung von Agroforstsystemen zur Wertholzproduktion.
Conference Paper
Full-text available
Prunus avium (L.), the wild cherry, is widely cultivated across Europe. Present within the natural and semi-natural forests managed as a high value timber tree or within an orchard as a grafted cultivar for the production of cherries. The differences in management are as disparate as the product goals. There is a distinct absence of yield models wi...
Conference Paper
Full-text available
Quality of wood chips derived from short rotation coppice (SRC) plantations is largely determined by bark proportion. A greater proportion of bark will result in a lower quality product. A high bark proportion will present a higher moisture content, will create greater ash volumes and higher nutrient export. The main aim was to study the effect of...
Article
Full-text available
Context Current production from natural forests will not satisfy future world demand for timber and fuel wood, and new land management options are required. Aims We explore an innovative production system that combines the production of short rotation coppice in wide alleys with the production of high-value trees on narrow strips of land; it is an...
Technical Report
Full-text available
D 6.3 provides a summary of the state‐of‐research as regards the production of non‐wood forest products in Europe. It summarises the advances, existing knowledge, data availability and gaps in order to highlight the potential lanes for progress in further research. The paper is structured along the lines of primary production, marketing and trade,...
Article
Full-text available
In this study the influence of three different tillage systems in combination with eight varying weed treatments applied within the establishment year and its effect on the final above ground leafless biomass production (after the third growing season) of short rotation coppice poplar is presented. The three tillage systems included variants with p...
Article
Full-text available
In this study the quantification of biomass within all relevant compartments of a three-year-old poplar clone (P. maximowicii × P. trichocarpa) planted on abandoned agricultural land at a density of 5000 trees ha−1 is presented. A total of 30 trees within a diameter range of 1.8 cm to 8.9 cm, at breast height (dbh at 1.3 m), were destructively samp...

Questions

Questions (2)
Question
Hi, wondering if anybody can point me in the direction of some reliable non-wood-forest-product yield data in the temperate zone.
Specifically the production of Cherries (Prunus avium and domesticated cultivars), Walnuts (Juglans regia but also J. nigra etc.), Chestnuts (Castanea sativa, cultivars and related species) and finally Sorbus berries (Sorbus domestica, S.torminalis & S. aucuparia).
In the best case data on a 'per tree' basis relating yield to basic tree parameters (DBH/crown volume etc.) would be fantastic. More realistic would be values per hectare given a certain stocking density, prescribed management and information about the mean tree (as above DBH/crown parameters etc.). Furthermore, data covering a number of years would go a short way to negate fluctuating production due to external influence.
Can anyone help?
Much Appreciated
Jon
Question
Have you seen any recent publications: such as modification of thinning/ harvesting regimes for the production of a certain NWFP species? Likewise, yield models for tree products (cherries walnuts etc.) any experience? I'd be interested to hear of anything from this growing research field, especially from experiences gained in Europe. Thanks

Projects

Projects (4)
Project
The ASAP project (Dec 2018 - Nov 2022) is funded by the German Federal Ministry of Education and Research (BMBF) under the SPACES2 framework. The project incorporates partners from Germany and Southern Africa and targets the application of agroforestry systems as a suitable response for local stakeholders to anticipated economic, ecological and social challenges as a consequence of a changing climate.
Archived project
The WoodWisdom-Net project AgroCop (Combining Agroforestry and Short Rotation Coppice) aims to research how the production of high quality timber and feedstock wood for energy use can be increased in Europe.
Archived project
Non-wood forest products (NWFPs) have important commercial, environmental, social and recreational roles in many European forests. They also have a relevant place in the multifunctional sustainable forest management (MSFM) paradigm, being the main source of income from forests in several regions. Although the importance of NWFPs is recognised and accepted, forest research remains mainly focussed on timber production. Consequently knowledge about European NWFPs is comparatively scarce, as is research on their ecology, management and economics, required to optimize sustainable simultaneous production of different products from forests. It is proposed that a multidisciplinary European network on NWFPs will help to bridge these gaps. In this context, the main goal of the Action is to build a broad multidisciplinary network of European NWFPs researchers and managers, to review the current state of the art, highlight existing innovation, share information and experience, identify research topics, seek research synergies and by increasing the European-wide theoretical and practical understanding of NWFPs, promote their sustainable management.