Heinrich Spiecker

Heinrich Spiecker
University of Freiburg | Albert-Ludwigs-Universität Freiburg · Institute for Forest Growth

MS, PhD, Dr. h.c.mult.

About

333
Publications
56,241
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6,147
Citations
Citations since 2016
55 Research Items
3314 Citations
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20162017201820192020202120220100200300400500
20162017201820192020202120220100200300400500
20162017201820192020202120220100200300400500

Publications

Publications (333)
Article
Full-text available
As climate change increasingly affects forest ecosystems, detailed understanding of major effects is important to anticipate their consequences under future climate scenarios. The Mediterranean region is a prominent climate change hotspot, and evergreen cork oak ( Quercus suber L.) woodlands are particularly climatically sensitive due to cork (bark...
Article
Full-text available
Cork rings have been extensively used in dendroecological studies of the Mediterranean evergreen cork oak (Quercus suber L.). Through measurements of cork-ring width only, strong relationships have been found between cork-ring widths and climate parameters. To our knowledge, cork-ring density, which is an important cork quality attribute, has never...
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...
Article
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For constructing growth and yield models the concept of site index as measure of productivity is crucial. Here, we use nonlinear mixed-effects models (NLME) with random individual effects and nonlinear models with dummy variables as fixed individual effects (NLFE) to fit mechanistic growth functions to stem analysis data of the economically most im...
Article
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In this study, we developed dynamic top height growth models for the eight important Chinese tree species Larix gmelinii var. principis-rupprechtii, Pinus tabuliformis Carr., Pinus sylvestris var. mongolica Litv., Picea asperata Mast., Quercus mongolica Fisch. ex Ledeb, Betula platyphylla Suk., Betula dahurica Pall. and Populus davidiana Dode based...
Article
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Research Highlights: Our results provide novel perspectives on the effectiveness and collapse of compensatory mechanisms of tracheid development of Norway spruce during intra-seasonal drought and the environmental control of intra-annual density fluctuations. Background and Objectives: This study aimed to compare and integrate complementary methods...
Article
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Purpose of Review Non-native tree species (NNT) raise a range of different associations and emotions—to many citizens they are just an exotic curiosity in parks, to many conservationists they are an evil to native ecosystems that should be eradicated, to a rising group of foresters they are part of the solution to climate change and an increasing t...
Article
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A dendroclimatological approach was used to analyze growth responses of the tree species Pinus tabuliformis Carr., Larix gmelinii Rupr., Picea asperata Mast. and Quercus mongolica Fisch. ex Ledeb. in a region of temperate climate in Northeast China. Annual radial increment (ARI) measurements from stem cross-sections were used to identify the effect...
Article
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Key message Phloem cell production was less influenced by environmental factors than xylem cell production. The moment of maximum number of conducting phloem cells occurred at the end of the growing season. Abstract The understanding of the seasonality of phloem production, its dependence on climatic factors and potential trade-offs with xylem cel...
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
Book
Non-wood forest products (NWFP) are important goods provided by forest ecosystems. They comprise a group of products derived from mushrooms and truffles, understory plants to tree products, but also including animals and their products sourced from forests. The ecological requirements for the management of NWFP are as broad as the variety found bet...
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...
Article
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Forests are a large carbon sink with an additional substitution effect in the merchantable timber compartment of harvested trees, where carbon stored within the same volume of wood varies depending on wood density. Here, we investigated mean annual air-dry wood density variations depending on cambial age, annual radial increment, and two different...
Article
Full-text available
An amendment to this paper has been published and can be accessed via a link at the top of the paper.
Article
The crossdating of tree-ring series is typically based on tree-ring width sequences, which is a crude abstraction of the growth signal stored in tree rings. In contrast, intra-annual wood density data allows a much more detailed comparison of wood growth processes and new measurement techniques scale well to measure large amounts of samples. Thus,...
Poster
Recent trends in climate change and future predictions of increasing carbon emissions and rising temperature have drawn a general focus towards the topic of carbon storage and the enlargement of carbon sinks. Forest ecosystems of the world are one of the largest carbon sinks and play therefore an important role for global carbon storage. However, s...
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...
Chapter
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Douglas-fir grown in Europe produces high-grade timber, which generally equals or exceeds the value of timber from indigenous softwoods species and from other widespread exotic species (Sitka spruce, Japanese larch, Pinus sp., ... ). Douglas-fir wood properties are also less affected than those of other softwood species by increasing growth rates,...
Article
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Douglas-fir – an option for Europe What Science Can Tell Us 9 Author Heinrich Spiecker, Marcus Lindner, Johanna Schuler (editors) 15.01.2019 It is expected that European forests provide renewable resources for the bioeconomy, ensure biodiversity and other ecosystem services while help us to mitigate and adapt to and mitigate climate change. To se...
Article
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Northern forests at the leading edge of their distributions may not show increased primary productivity under climate warming, being limited by climatic extremes such as drought. Looking beyond tree growth to underlying physiological mechanisms is fundamental for accurate predictions of forest responses to climate warming and drought stress. Within...
Article
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With lengthening growing seasons but increased temperature variability under climate change, frost damage to plants may remain a risk and could be exacerbated by poleward planting of warm-adapted seed sources. Here, we study cold adaptation of tree populations in a wide-ranging coniferous species in western North America to inform limits to seed tr...
Article
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Nutrient (NH4, PO4 and K) leaching from oven dried green leaves of Emblica officinalis Gaerten, Sesbania grandiflora (L.) Pers. and Moringa oleifera Lam.were investigated in laboratory condition. Oven-dried green leaves were immersed in demineralized distilled water for 8 days. Electrical conductivity (EC), Total dissolved solids (TDS) and nutrient...
Article
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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...
Article
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MICA enables the automatic synchronization of discrete data curves. To this end, characteristic points of the curves’ shapes are identified. These landmarks are used within a heuristic curve registration approach to align profile pairs by mapping similar characteristics onto each other. In combination with a progressive alignment scheme, this enabl...
Article
Quantitative analysis of wood anatomy is a powerful dendroecological tool to provide new insights into environmental signals encoded in tree-rings. Nevertheless, studies with long time series or large sample sizes are not very common for diffuse-porous tree species due to the laborious sample preparation and image analysis. Finding a compromise bet...
Article
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European beech (Fagus sylvatica L.) is one of the economically most important broadleaved tree species in Central Europe. However, beech shows high drought sensitivity and calls for profound research to test its ability to cope with limited water resources. Here, we investigated the drought tolerance of beech to the 2003 drought as influenced by Kr...
Article
Full-text available
Wood density is considered to be the most important predictor of wood quality but despite its importance, diffuse-porous tree species have been the subject of only a limited number of studies. The importance of European beech forests for Central Europe calls for profound research to examine the potential impact of a warmer climate on the quality of...
Article
Background: Wood density is considered to be the most important predictor of wood quality but despite its importance, diffuse-porous tree species have been the subject of only a limited number of studies. The importance of European beech forests for Central Europe calls for profound research to examine the potential impact of a warmer climate on th...
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...
Article
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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
A useful approach to monitor tree response to climate change and environmental extremes is the recording of long-term time series of stem radial variations obtained with precision dendrometers. Here, we study the impact of environmental stress on seasonal growth dynamics and productivity of yellow birch (Betula alleghaniensis Britton) and sugar map...
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
The importance of European beech (Fagus sylvatica L.) for the Central European forest and wood sector demands profound research to examine the adaptive capacity of beech forests to changing environmental conditions. Quantitative wood anatomy is a valuable tool for studying the relation between structural and functional traits of trees, but due to t...
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
In the Mediterranean climate regions, drought events are expected to affect the growth of forests ecosystems by changing trees growth rates and eventually inducing shifts in their growth patterns. Cork oak (Quercus suber L.) is a strictly western Mediterranean tree species periodically harvested for its bark, the cork. So far, cork oak has received...
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...
Article
Full-text available
Choosing drought-tolerant planting stock in reforestation programs may help adapt forests to climate change. To inform such reforestation strategies, we test lodgepole pine (Pinus contorta Doug. ex Loud. var latifolia Englm.) population response to drought, and infer potential benefits of a northward transfer of seeds from drier, southern environme...
Article
Studying intra-annual wood formation dynamics provides valuable information on how tree growth and forests are affected by environmental changes and climatic extreme events. This study has the aim to evaluate and to quantify synergetic potentials emerging from a combination of current state of the art techniques used to monitor intra-annual wood fo...
Article
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An open source tool named SimpleTree, capable of modelling highly accurate cylindrical tree models from terrestrial laser scan point clouds, is presented and evaluated. All important functionalities, accessible in the software via buttons and dialogues, are described including the explanation of all necessary input parameters. The method is validat...
Article
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Anticipated changes in climate and research findings on the drought sensitivity of beech have triggered controversial discussions about the future of European beech. We investigated the growth response of beech on the tree- and stand-level in mature stands to three different thinning intensities (no thinning, strong thinning, very strong thinning)...
Research
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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.