A5101848269- Soil Carbon and Nitrogen Dynamics
- Peatlands and Wetlands Ecology
- Ecology and Vegetation Dynamics Studies
- Plant Water Relations and Carbon Dynamics
- Botany and Plant Ecology Studies
- Seedling growth and survival studies
- Plant nutrient uptake and metabolism
- Mycorrhizal Fungi and Plant Interactions
- Plant responses to elevated CO2
- Forest Ecology and Biodiversity Studies
- Soil and Water Nutrient Dynamics
- Plant Stress Responses and Tolerance
- Forest ecology and management
- Tree-ring climate responses
- Crop Yield and Soil Fertility
- Plant Ecology and Soil Science
- Lichen and fungal ecology
- Biological Control of Invasive Species
- Cassava research and cyanide
- Agronomic Practices and Intercropping Systems
- Plant Parasitism and Resistance
- Forest Insect Ecology and Management
- African Botany and Ecology Studies
- Ecology and Conservation Studies
- Agriculture, Plant Science, Crop Management
University of Konstanz
2015-2023
University of Freiburg
2009-2021
Institute of Forest Science
2016
The University of Melbourne
2006-2010
Schlumberger (Ireland)
2010
Purdue University West Lafayette
1993
University of Illinois Chicago
1990
University of Massachusetts Amherst
1983-1985
Czech Agrifood Research Center
1976
The relationships between plant carbon resources, soil and nitrogen content, ectomycorrhizal fungal (EMF) diversity in a monospecific, old-growth beech (Fagus sylvatica) forest were investigated by manipulating flux girdling. We hypothesized that disruption of the supply would not affect EMF species numbers if EM fungi can be supplied internal carbohydrate resources or result selective disappearance taxa because differences demand different fungi. Tree status, root demography, colonization,...
In contrast to animal cells, plants use nitrate as a major source of nitrogen. Following the uptake nitrate, this macronutrient is fed into vasculature for long-distance transport. The Arabidopsis thaliana shoot expresses anion channel SLOW ANION CHANNEL1 (SLAC1) and its homolog SLAC1 HOMOLOGOUS3 (SLAH3), which prefer substrate but cannot exclude chloride ions. By contrast, we identified SLAH2 nitrate-specific that impermeable chloride. To understand molecular basis selection in channel,...
To investigate the impact of organic N compounds for inorganic nitrogen uptake in rhizosphere, we fed ammonium nitrate with or without amino acids (i.e., glutamine arginine) to roots non-mycorrhizal beech (Fagus sylvatica L.) seedlings under controlled conditions at different levels availability. Uptake individual sources was determined from 15N (inorganic N) and 15N13C (organic accumulation roots. In addition, gene fragments encoding proteins involved metabolism were cloned expression...
European beech forests growing on marginal calcareous soils have been proposed to be vulnerable decreased soil water availability. This could result in a large-scale loss of ecological services and economical value changing climate. In order evaluate the potential consequences this drought-sensitivity, we investigated species range shifts for 21st century by statistical distribution modelling present day projected future climate conditions. We found dramatic decline 78% until 2080. Still...
Climate change as projected for Central Europe will lead to prolonged periods of summer drought and enhanced air temperature. Thus, forest management practices are required take into account how species performance is adapted cope with these climate changes. Oak trees may play a major role in future forests because their relative drought-tolerance compared other like beech. Therefore, this study investigated the stress responses (i.e., anti-oxidants, free amino acids) leaves three widely...
To investigate the short-term consequences of direct competition between beech and sycamore maple on root N uptake composition, mycorrhizal seedlings both tree species were incubated for 4 days (i.e. only, only or together) in an artificial nutrient solution with low availability. On fourth day, experiments conducted to study effects inorganic organic uptake. For this purpose, multiple sources applied a single label. Furthermore, fine roots sampled analysed total amino acids, soluble...
Rhizospheric nitric oxide (NO) and carbon dioxide (CO2) are signalling compounds known to affect physiological processes in plants. Their joint influence on tree nitrogen (N) nutrition, however, is still unknown. Therefore, this study investigated, for the first time, combined effect of rhizospheric NO CO2 levels N uptake pools European beech (Fagus sylvatica L.) seedlings depending availability. For purpose, roots were exposed one nine combinations (i.e., low, ambient, high plus...
Abstract In future, prolonged summer drought and heat will constitute a major risk for the cultivation of shallow‐rooting beech in Central Europe negatively affect productivity forests. pot experiment under controlled conditions, influence long‐term (28 d) water deprivation on nitrogen (N), carbon (C), phosphate (P i ), ascorbate (ASC) concentrations was examined leaves fine roots seedlings ( Fagus sylvatica L.) from six provenances originating (Germany: Neidenstein Illertissen, intermediate...
Here, we characterized nitrogen (N) uptake of beech (Fagus sylvatica) and their associated ectomycorrhizal (EM) communities from NH4+ NO3- . We hypothesized that a proportional fraction N is transferred to the host, thereby resulting in same patterns plants mycorrhizal communities. 15 was studied under various field conditions after short-term long-term exposure pulse equimolar concentrations, where one compound replaced by N. In native EM assemblages, higher than , regardless season, water...
Plants have evolved a vast array of defence mechanisms to avoid or minimize damage caused by herbivores and pathogens. The costs benefits defences are thought vary with the availability resources, herbivore pressure plant functional traits. We investigated resource (nitrogen) growth cost deploying cyanogenic glycosides in seedlings Eucalyptus cladocalyx (Myrtaceae). To do this, we grew plants under range soil N conditions, from levels that were limiting for those saturating growth, measured...
Abstract Climate‐tolerant tree species and/or provenances have to be selected ensure the high productivity of managed forests in Central Europe under prognosticated climate changes. For this purpose, we studied responses saplings from three oak ( i.e. Quercus robur , Q. petraea and pubescens ) different climatic origin low or rainfall, temperature habitats) with regard leaf nitrogen (N) composition as a measure N nutrition. Saplings were grown model ecosystems on either calcareous acidic...
Plant species use different strategies for maximizing growth and fitness under changing environmental conditions. At the ecosystem level, seedlings in particular compete with other vegetation components light nitrogen (N), which often constitute growth-limiting resources. In this study, we investigated effect of availability on competition N between European beech sycamore maple analysed consequences composition metabolites fine roots. Our results show acquisition maple. Both responded to...