A5036998921- Plant Water Relations and Carbon Dynamics
- Tree-ring climate responses
- Forest ecology and management
- Ecology and Vegetation Dynamics Studies
- Botany and Plant Ecology Studies
- Soil Carbon and Nitrogen Dynamics
- Plant responses to elevated CO2
- Seedling growth and survival studies
- Lichen and fungal ecology
- Plant Ecology and Soil Science
- Forest Ecology and Biodiversity Studies
- Plant responses to water stress
- Tree Root and Stability Studies
- Hydrology and Watershed Management Studies
- Geology and Paleoclimatology Research
- Plant Stress Responses and Tolerance
- Rangeland Management and Livestock Ecology
- Forest Insect Ecology and Management
- Soil erosion and sediment transport
- Hydrology and Sediment Transport Processes
- Plant Pathogens and Fungal Diseases
- Rangeland and Wildlife Management
- Plant Taxonomy and Phylogenetics
- Peatlands and Wetlands Ecology
- Agroforestry and silvopastoral systems
Universität Trier
2015-2025
McMaster University
2020
University of Alaska Fairbanks
2020
Emory University
2010
Pfizer (Austria)
2010
Johannes Gutenberg University Mainz
2010
University of Göttingen
1998-2009
Nordwestdeutsche Forstliche Versuchsanstalt
1995
Commonwealth Scientific and Industrial Research Organisation
1981
Summary Incidences of oak decline have occurred repeatedly during the past three centuries as well in most recent decades. On basis historical records and dendrochronological measurements, Central Europe has been attributed to single or combined effects climatic extremes (winter frost, summer drought), defoliating insects, pathogenic fungi. Starting from a literature review, we discuss possible roles various abiotic (air pollution, nitrogen eutrophication, soil chemical stress, extremes,...
ABSTRACT The hypothesis that water relations and growth of phreatophytic Tamarix ramosissima Ledeb. Populus euphratica Oliv. on dunes varying height in an extremely arid Chinese desert depend vertical distance to a permanent table was tested. Shoot diameter P. inversely correlated with groundwater depth (GD) 7 23 m (adj. R 2 = 0.69, P 0.025); T. varied independent GD between 5 24 ( 0.385). Pre‐dawn (pd) midday (md) potentials were lower (minimum pd −1.25 MPa, md −3.6 MPa at GD) than −0.9...
We hypothesised that the decomposition rates of leaf litter will increase along a gradient decreasing fraction European beech (Fagus sylvatica) and increasing tree species diversity in generally beech-dominated Central temperate deciduous forests due to an quality. studied including its lignin monospecific (pure beech) stands with up five genera (Acer spp., Carpinus betulus, Fagus sylvatica, Fraxinus excelsior, Tilia spp.) using litterbag approach. Litter was more rapid stand-representative...
Abstract The production and composition of leaf litter, soil acidity, exchangeable nutrients, the amount distribution organic matter were analyzed in a broad‐leaved mixed forest on loess over limestone Central Germany. study aimed at determining current variability surface‐soil acidification nutrient status, identifying evaluating main factors that contributed to these properties along gradient decreasing predominance European beech ( Fagus sylvatica L.) increasing tree‐species diversity....
Abstract. The Tarim River basin, located in Xinjiang, NW China, is the largest endorheic river basin China and one of all Central Asia. Due to extremely arid climate, with an annual precipitation less than 100 mm, water supply along Aksu rivers solely depends on water. This linked anthropogenic activities (e.g., agriculture) natural semi-natural ecosystems as both compete for ongoing increase consumption by agriculture other human this region has been enhancing competition between needs...
Significance Climate change increases the frequency of drought events and leads to higher variability in precipitation. Drought impairs rhizosphere (root root-associated microbiome) functioning trees a reduced assimilate supply belowground. It remains unclear if thus whole-tree can quickly recover after release. We show that metabolic activity previously drought-exposed 100-y-old Scots pine increased response subtle soil moisture (induced by light rainfall). As consequence this change,...
Abstract This review attempts to assess the causal factors and their interrelations that cause decline of widespread European oak ( Quercus ) species. In particular, it provides an overview recent advances in cause-effect research since 2000. The first recorded outbreak took place 1739-1748, was followed by several other episodes, most them occurring twentieth century. mortality rates differ substantially among regions episodes; however, entire stands is a rare event. principal causes are...
Summary While photosynthetic isotope discrimination is well understood, the postphotosynthetic and transport‐related fractionation mechanisms that influence phloem subsequently tree ring δ 13 C are less investigated may vary among species. We studied seasonal diel courses of leaf‐to‐phloem differences water‐soluble organic matter ( WSOM ) in vertical crown gradients followed assimilate transport via branches to trunk at breast height European beech Fagus sylvatica Douglas fir Pseudotsuga...
In 2018—2020, Central-European forests suffered from extremely hot and dry summers. We used data long-term forest monitoring of six stands European beech (Fagus sylvatica) two oak (Quercus petraea/Q. robur) growing on different geological substrates in the climatically uniform state Saarland (south-western Germany) for analyzing leaf traits period 2004—2021. aimed at detecting overall effects drought foliar morphology, nutrient concentrations, injury, alterations these traits. Across sites,...
ABSTRACT Aim Tamarisk ( Tamarix ) is the predominant but taxonomically complex genus of Tamaricaceae. The morphologically similar shrub or tree species grow in arid, salt‐influenced habitats Eurasia and Africa. We sampled woody shoots seven at eastern margin (NW China; T. ramosissima centre (Uzbekistan; hispida Indo‐Turanian region as well (Israel; aphylla , negevensis nilotica western (southern Spain; boveana gallica Mediterranean region, two diversity centres genus. To explore drivers...
Abstract The excretion of endogenous creatinine and 3‐methylhistidine by subjects with muscle diseases has been measured in order to assess mass fractional rates myofibrillar protein degradation. Increases the breakdown were observed all Duchenne, Becker, autosomal recessive Duchenne‐like, limb‐girdle muscular dystrophy; dystrophia myotonica; myotonia congenita; peroneal atrophy; myasthenia gravis; central core disease; some cases spinal but no facioscapulohumeral dystrophy or dystonia...
Abstract Questions: Do the vegetation‐specific patterns in forelands of river oases Taklamakan Desert provide clues to degree which a vegetation type depends on unsaturated soil moisture, brought about by extensive floodings, or phreatic water? Location: Foreland Qira oasis southern rim Desert, Xinjiang Uygur Autonomous Region, China. Methods: A map was prepared using SPOT satellite image and ground truthing. Measurements water contents were obtained from flooding experiment transformed into...
Combined δ(13) C and δ(18) O analyses of water-soluble leaf twig phloem material were used to determine intrinsic water-use efficiency (iWUE) variability stomatal conductance at different crown positions in adult European beech (Fagus sylvatica) Douglas-fir (Pseudotsuga menziesii) trees. Simultaneous gas exchange measurements allowed evaluation the differences calculating iWUE from or compounds, comparison with a semi-quantitative dual isotope model infer net photosynthesis (A(n) ) between...