Hans-Peter Kahle

Hans-Peter Kahle
University of Freiburg | Albert-Ludwigs-Universität Freiburg · Chair of Forest Growth and Dendroecology

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113
Publications
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Publications

Publications (113)
Article
Climate change is expected to have significant impacts on European forests, causing changes in the geographic distribution of species and ecosystem functioning. Douglas fir (Pseudotsuga menziesii) and silver fir (Abies alba) are considered potential alternatives to the drought endangered Norway spruce (Picea abies). However, still little is known a...
Article
Three different Eucalyptus urophylla clones grown under two different spacing regimes in an experimental site in the state of São Paulo, Brazil, were analyzed to test effects of clone identity, spacing, cambial age and hydroclimatic conditions on high-resolution intra-annual wood density profiles. Since distinct periodic tree-ring boundaries were n...
Article
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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
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The magnitude and duration of ongoing global warming affects tree growth, especially in semi-arid forest landscapes, which are typically dominated by a few adapted tree species. We investigated the effect of climatic control on the tree growth of Persian oak (Quercus brantii Lindl.), which is a dominant species in the Central Zagros Mountains of we...
Article
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Hot droughts are expected to increase in Europe and disturb forest ecosystem functioning. Wood formation of trees has the potential to adapt to those events by compensatory mechanisms between the rates and durations of tracheid differentiation to form the typical pattern of vital wood anatomical structures. • We monitored xylogenesis and measured...
Article
Dendrometer measurements are a frequently used alternative to the laborious and time consuming microcoring to investigate intra-annual growth dynamics of trees. However, since dendrometer data not only comprise cambial growth, but also hydrological fluctuations, both signals need to be disentangled to derive critical dates of xylem phenology from d...
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Heatwaves exert disproportionately strong and sometimes irreversible impacts on forest ecosystems. These impacts remain poorly understood at the tree and species level and across large spatial scales. Here, we investigate the effects of the record-breaking 2018 European heatwave on tree growth and tree water status using a collection of high-tempor...
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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...
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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...
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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...
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Highlights: European beech (Fagus sylvatica L.) and silver fir (Abies alba Mill.) displayed parabolic elevational trends of the cessation of xylem cell differentiation phases. Xylem phenology and growth rates of Scots pine (Pinus sylvestris L.) appeared to be less influenced by the 2018 drought, whereas beech reduced growth on the lowest elevation...
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...
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Abstract Hydroclimate, the interplay of moisture supply and evaporative demand, is essential for ecological and agricultural systems. The understanding of long-term hydroclimate changes is, however, limited because instrumental measurements are inadequate in length to capture the full range of precipitation and temperature variability and by the un...
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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
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
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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
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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
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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...
Conference Paper
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This paper presents the results of a field study on the growth and yields of two innovative energy crops, Virginia mallow (Sida hermaphrodita L.) and cup plant (Silphium perfoliatum L.) tested during the SidaTim project in Poland, Germany, Italy and the UK. Both plants are originally native to North America and they are perennial energy crops. Both...
Poster
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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
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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
To assess the long-term impacts of forest management interventions under climate change, process-based models, which allow to predict transient dynamics under environmental change, are arguably the most suitable tools available. A challenge for using these models for management decisions, however, is their higher parametric uncertainty, which propa...
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
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...
Article
Accurate and reliable predictions of the future development of forest site productivity are crucial forthe effective management of forest stands. Static models which simply extrapolate productivity intothe future are inappropriate under conditions of environmental change since they lack a close linkbetween fundamental environmental drivers and fore...
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
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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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)...
Article
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Wood density is a trait of paramount importance for the assessment of wood quality, in dendroclimatology and in attempts to enhance biomass and carbon estimations. X-ray densitometry is the established but costly and time consuming method for high resolution measurements of wood density. An inexpensive and rapid alternative is High Frequency (HF) d...
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The objective of the study is to introduce a simultaneous approach to extracting growth trends from diameter increment series by combining tree- and stand-level information in the framework of mixed-effects modeling. The model results are compared with those of the sequential modeling approach according to Yue et al. (2011). Comprehensive data from...
Article
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En este estudio se han calculado las tendencias en el crecimiento del pino silvestre (Pinus sylvestris L.), desde comienzos de los años 60, en el Estado de Brandenburgo (Este de Alemania). Del mismo modo se han investigado las interacciones entre los factores que causan el crecimiento radial y en altura, como son la temperatura, la precipitación y...
Article
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Spectral analysis of tree ring data sets of Siberian spruce (Picea obovata) and Scots pine (Pinus sylvestris L.) was carried out to study the effects of climatic factors on the conifer tree radial growth in the territory of the Komi Republic. Analyses were performed for different natural subzones in the Komi Republic: the forest-tundra transition z...
Article
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For Central Europe, climate projections foresee an increase in temperature combined with decreasing summer precipitation, resulting in drier conditions during the growing season. This might negatively affect forest growth, especially at sites that are already water-limited, i.e., at low elevation. At higher altitudes trees might profit from increas...
Conference Paper
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Recent changes in growth of silver fir in a 1.000 year context: In this report we present results to recent changes in growth of silver fir (Abies alba Mill.) based on retrospective growth data. The tree-ring data originate from two independently generated data sets: annual tree-ring width data of mainly archaeological timber, and time series of an...
Article
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The competence center InBioVeritas was founded in 2007 with the vision to integrate competences for ecological and socioeconomic research, sustainable land management and biodiversity conservation in the southern Mata Atlântica. Originating from a successful partnership in a recently terminated Brazilian-German research project (SOLOBIOMA), it is b...
Article
A method was developed to extract environmentally driven growth trends from data of periodically repeated measurements of experimental stands. The method was applied to 470 long-term Norway spruce (Picea abies [L.] Karst.) experiment stands located in southwest Germany. The detection of trends in stand basal area increment was based on a composite...
Conference Paper
Full-text available
In this study we tested whether an acceleration in height growth of Norway spruce ( Picea abies L. Karst.) trees is associated with more rapid ageing of the trees. The growth data originate form two cohort-studies (UNTHEIM (1996) and TOJIC (2010)). For these studies dominant sample trees on selected sites in southwestern Germany have been collected...
Article
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Abstract: Height growth of 19 Scots pine (Pinus sylvestris) and Norway spruce (Picea abies) stands in Germany, Austria and Finland, for which long-term records of foliar nutrient levels were available, was assessed retrospectively by stem analyses and compared with data from regionally applied yield tables as references. Gridded historical time ser...
Book
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Forest growth in Europe has been increasing during the last decades. The possible causes suggested to explain this have been increasing atmospheric carbon dioxide concentration, improved temperature and precipitation climate, increasing nitrogen deposition and better management. In this book complementary approaches are used to discriminate between...
Chapter
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The correlative approach within the Recognition project comprises the Historical Development Investigation (HDI), and the Present State Analysis (PSA) (Chapter 2.1 and 2.2). Results of the HDI are presented in Chapter 4.1. This section presents results of the PSA: temporal trends and spatial patterns of height growth changes in relation to changes...