A5009086416- Plant Water Relations and Carbon Dynamics
- Tree-ring climate responses
- Remote Sensing in Agriculture
- Species Distribution and Climate Change
- Remote Sensing and LiDAR Applications
- Plant responses to elevated CO2
- Forest ecology and management
- Forest Ecology and Biodiversity Studies
- Ecology and Vegetation Dynamics Studies
- Horticultural and Viticultural Research
- Biocrusts and Microbial Ecology
- Climate variability and models
- Plant and animal studies
- Isotope Analysis in Ecology
- Algal biology and biofuel production
- Cryospheric studies and observations
- Groundwater and Isotope Geochemistry
- Planetary Science and Exploration
- Climate change and permafrost
- Leaf Properties and Growth Measurement
- Computational Physics and Python Applications
- Hydrology and Drought Analysis
- Greenhouse Technology and Climate Control
- Hydrology and Watershed Management Studies
- Plant responses to water stress
Swiss Federal Institute for Forest, Snow and Landscape Research
2021-2025
University of Basel
2012-2025
Harvard University
2018-2025
Dana-Farber/Harvard Cancer Center
2020-2021
Harvard University Press
2021
Northern Arizona University
2020
Evolutionary Genomics (United States)
2018
In most temperate tree species, phenological events such as flowering and autumnal cessation of growth are not primarily controlled by temperature.
Summary Attempts at explaining range limits of temperate tree species still rest on correlations with climatic data that lack a physiological justification. Here, we present synthesis multidisciplinary project offers mechanistic explanations. Employing climatology, biogeography, dendrology, population and reproduction biology, stress physiology phenology, combine results from in situ elevational (Swiss Alps) latitudinal (Alps vs. Scandinavia) comparisons, reciprocal common garden phytotron...
Abstract Phenology is a first‐order control on productivity and mediates the biophysical environment by altering albedo, surface roughness length evapotranspiration. Accurate transparent modelling of vegetation phenology therefore key in understanding feedbacks between biosphere climate system. Here, we present phenor r package framework. The framework leverages measurements from four common observation datasets, PhenoCam network, USA National Network ( ‐ NPN ), Pan European Project PEP...
Spring phenology of temperate forest trees is optimized to maximize the length growing season while minimizing risk freezing damage. The release from winter dormancy environmentally mediated by species-specific responses temperature and photoperiod. We investigated response early spring photoperiod at different stages in cuttings four tree species controlled environments. By tracking bud development, we were able identify onset swelling growth Acer pseudoplatanus L., Fagus sylvatica Quercus...
Significance Oxygen and hydrogen isotope distributions in rain snow are chemical tracers that carry information about sources history of precipitation. This is useful for many applications environmental biological sciences, but measured values often not available a desired time location. We developed user-friendly model using machine learning generates monthly series precipitation large compilation readily routinely updated climate data. allows records to be produced span the entire duration...
For obvious practical reasons, tree phenological data obtained in warming and photoperiod experiments are generally conducted on juvenile trees (saplings seedlings) or watered rooted cuttings collected from adult trees. As differ their response to environmental conditions, they represent inappropriate plant material experimentally assess the responses of forests seasonality. Cuttings physiologically closer trees, but cutting itself disruption hormonal signals may create artefacts. This study...
The ability to automatically delineate individual tree crowns using remote sensing data opens the possibility collect detailed information over large geographic regions. While crown delineation (ITCD) methods have proven successful in conifer-dominated forests Light Detection and Ranging (LiDAR) data, it remains unclear how well these can be applied deciduous broadleaf-dominated forests. We five automated LiDAR-based ITCD across fifteen plots ranging from conifer- forest stands at Harvard...
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...
The phenological timing of leaf out in temperate forests is a critical transition point each year that alters the global climate system, which turn, feeds back to plants, driving occur nearly 3 d earlier per decade as temperatures rise. To improve predictions timing, urban heat islands (UHIs) or densely developed areas are hotter than surrounding undeveloped regions often used approximate warming via space-for-time substitutions (i.e., rural-to-urban temperature gradients). However, more...
Das Monitoring-Netzwerk TreeNet untersucht mit automatischen Sensoren an Baumstämmen (Punktdendro- metern) den Wasserhaushalt und das Wachstum von Waldbäumen rund 70 Standorten in der Schweiz (inkl. 13 LWF-Standorten). Alle zehn Minuten werden über 500 Bäumen die Stammradien Mikrometergenauig- keit gemessen sowie Daten Atmosphäre Boden gesammelt. Hier zeigen wir charakteristische physiologi- sche Durchschnittswerte neun Baumarten basierend auf Einzelbaummessungen (1998–2023). Unterschiede...
Natural changes in photoperiod, light quantity, and quality play a key role plant signaling, enabling daily seasonal adjustment of growth development. Growing concern about the global climate crisis together with scattered reports interactive effects temperature parameters on plants necessitates more detailed information these effects. Furthermore, actual emitting diode (LED) lighting technology allows mimicking scenarios similar to natural conditions, but fully exploit this cultivation,...
Manual chamber-based measurements of CO2 (and H2O) fluxes are important for understanding ecosystem carbon metabolism. Small opaque chambers can be used to measure leaf, stem and soil respiration. Larger transparent net exchange CO2, small jars often serve this purpose laboratory incubations plant material. We developed an Android application (app), called Flux Puppy, facilitate flux in the field laboratory. The app is designed run on inexpensive handheld device, such as a tablet or phone,...
The TreeNet research and monitoring network has been continuously collecting data from point dendrometers air soil microclimate using an automated system since 2011. goal of is to generate high temporal resolution datasets tree growth water dynamics for provide near real-time indicators forest performance drought stress a wide audience. This paper explains the key working steps installation sensors in field acquisition, transmission, processing, online visualization. Moreover, we discuss...
Summary Leaf optical properties impact leaf energy balance and thus temperature. The effect of development on mid‐infrared (MIR) reflectance, hence thermal emissivity, has not been investigated in detail. We measured a suite morphological characteristics, as well directional‐hemispherical reflectance from ultraviolet to infrared wavelengths (250 nm 20 µm) leaves five temperate deciduous tree species over the 8 wk following spring emergence. By contrast at shorter wavelengths, shape magnitude...
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Carbon dynamics within trees are intrinsically important for physiological functioning, in particular growth and survival, as well ecological interactions on multiple timescales. Thus, these internal play a key role the global carbon cycle by determining residence time of forests via allocation to different tissues pools, such leaves, wood, storage, exudates. Despite importance tree dynamics, our understanding how is used trees, once assimilated, has major gaps. The primary tissue that...
How variations in carbon supply affect wood formation remains poorly understood particular mature forest trees. To elucidate how affects allocation and formation, we attempted to manipulate the cambial region by phloem girdling compression during mid- late-growing season measured effects on structural development, CO2 efflux nonstructural reserves stems of white pines. Wood stem varied with a location relative treatment (i.e., above or below restriction). We observed up twice as many...
Abstract Ecological data are collected and shared at an increasingly rapid pace, but it is often in inconsistent untraceable processed forms. Images of wood contain a wealth information such as colours textures most commonly reduced to ring‐width measurements before they can be various common file formats. Archiving digital images samples libraries, which have been developed for ecological analysis publicly available, remains the exception. We Wood Image Analysis Dataset (WIAD), open‐source...
Abstract Climate change is reducing the amount, duration, and extent of snow across high‐latitude ecosystems. But, in landscapes where persistent winter cover develops, experimental platforms to specifically investigate interactions between warming changes snowpack, impacts on ecosystem processes, have been lacking. We leveraged a whole‐ecosystem experiment boreal peatland forest quantify how depth, fractional vary with up +9°C. found that every snow‐related quantity we examined declined...