A5086646418- Plant Water Relations and Carbon Dynamics
- Tree-ring climate responses
- Forest ecology and management
- Rangeland Management and Livestock Ecology
- Wildlife Ecology and Conservation
- Indigenous Studies and Ecology
- Plant Parasitism and Resistance
- Plant and animal studies
- Ecology and Vegetation Dynamics Studies
- Plant responses to water stress
- Forest Ecology and Conservation
- Seedling growth and survival studies
- Fire effects on ecosystems
- Plant and Fungal Species Descriptions
- Soil Carbon and Nitrogen Dynamics
- Hydrology and Watershed Management Studies
- Leaf Properties and Growth Measurement
- Species Distribution and Climate Change
- Plant responses to elevated CO2
- Remote Sensing in Agriculture
- Horticultural and Viticultural Research
- Plant nutrient uptake and metabolism
University of Utah
2024-2025
University of Basel
2020-2024
Imperial College London
2020-2021
European beech (Fagus sylvatica) was among the most affected tree species during severe 2018 drought. It not only suffered from instant physiological stress but also showed symptoms of defoliation and canopy decline in following year. To explore underlying mechanisms, we used Swiss-Canopy-Crane II site studied branches healthy symptomatic trees repair hydraulic function concentration carbohydrates drought 2019. We found loss conductance 2018, which did recover 2019 that developed year after...
We took advantage of the European 2018 drought and assessed mechanisms causing differences in vulnerability among mature individuals nine co-occurring tree species at Swiss Canopy Crane II site Switzerland. Throughout we monitored leaf water status determined native embolism formation canopy trees as indicators vulnerability. also hydraulic thresholds (Ψ12 -, Ψ50 - Ψ88 -values), corresponding safety margins (HSMs) carbohydrate reserves for all well total average area per tree, used stable...
Tree crowns experience strong vertical microclimatic gradients, particularly in light availability. Surprisingly, little is known about whether these gradients cause within-crown variation leaf phenology and such variations represent different light-use strategies of sun- shade leaves. In a temperate mixed forest at the Swiss Canopy Crane II site Switzerland, we measured over three years annual upper lower mature trees from six broadleaved conifer species. We further recorded microclimate...
The canopies of mature trees establish a vertical microclimatic gradient, especially in light availability. decreasing irradiance from top to bottom lead significant differences the seasonal C assimilation between uppermost and lowest branches tree crowns. But whether this translates also net C-balance sun- vs. shade remains unclear. Here, we present in-situ measurements upper lower three conifer species 6 broadleaved at mixed temperate forest Swiss Canopy Crane II facility. We combined...
Understanding the within-tree variability of non-structural carbohydrates (NSC) is crucial for interpreting point measurements and calculating whole-tree carbon balances. Yet, little known about how vertical light gradient within tree crowns influences branch NSC concentrations dynamics. We measured concentrations, irradiance key leaf traits in uppermost, sun-exposed lowest, shaded branches mature, temperate trees from nine species with high temporal resolution throughout one growing season....
The balance between terrestrial carbon assimilation and water loss is optimized by stomatal control in leaves. response of conductance to increasing vapor pressure deficit (VPD) critical the context climatic change highly variable tree species environments. Why this variability VPD sensitivity exists still largely unknown. Yet, as regulatory cues initiating closure remain unclear, current simulations forest use face significant uncertainty. To address knowledge gap for most common European...
Abstract Liana dynamics may influence tree and vice versa. Only long‐term studies can perhaps disentangle them. In two permanent plots of lowland dipterocarp forest at Danum, a liana census in 1988 was repeated 2018. The primary still late stage recovery from an inferred large natural disturbance the past. Mean number lianas per decreased by 22% 34% 1 2, different ways. By 2018, there were relatively more trees with few fewer many than 1988. redistribution strongest for overstory...
Abstract Liana dynamics may influence tree and vice versa. Only long-term studies can perhaps disentangle them. In two permanent plots of lowland dipterocarp forest at Danum a liana census in 1988 was repeated 2018. The primary still late stage recovery from an inferred large natural disturbance the past. Mean number lianas per decreased by 22 34% 1 2, different ways. By 2018 there were relatively more trees with few fewer many than 1988. redistribution strongest for overstorey...
<p>Temperate trees are facing an increasing challenge from limited water supply and increased atmospheric demand due to extreme trend in drought events. Particularly, structural-morphological traits such as root-water uptake depth (RWUD) key for determining the performance of a species during drought. In addition RWUD, ultimately understanding temporal origin soil used by could provide important insights into vulnerability.</p> <p>The goal this study...
Most of the carbon (C) reserves in trees are stored living parenchyma stems and roots exhibit characteristic variations with phenology, growth environmental stress. Up to date, it is only partially understood how formation re-mobilization C sapwood regulated synchronized over tissues long distances. Mechanistic concepts storage therefore often assume simple bucket-models, where amount equals net-balance between assimilation sum all sink activities (e.g., respiration growth).Here, we...
<p>Trees in temperate climates show distinct seasonality of leaf photosynthetic function and tree growth, which has strong influence on the annual cycle terrestrial carbon sequestration. Thus, there are intense efforts to explore phenological pattern growth species understand their internal external regulation. In this presentation, we summarize our past research field, combining results from different experimental studies field observations a large number European species. We...
<p>Leaves in tree crowns experience different microclimates depending on their vertical positions, particularly light availability. This leads to rates of carbon assimilation. Additionally, leaf phenology potentially varies along the same gradient. Therefore, it can be assumed that size and seasonal dynamics non-structural carbohydrate (NSC) pool are sunlit shaded twigs individual trees.</p><p>Here we test how microclimatic gradients influence NSC...