A5052372877- Tree-ring climate responses
- Plant Water Relations and Carbon Dynamics
- Forest ecology and management
- Ecology and Vegetation Dynamics Studies
- Geology and Paleoclimatology Research
- Botany and Plant Ecology Studies
- Landslides and related hazards
- Fire effects on ecosystems
- Pleistocene-Era Hominins and Archaeology
- Tree Root and Stability Studies
- Remote Sensing in Agriculture
- Hydrology and Sediment Transport Processes
- Climate variability and models
- Ancient and Medieval Archaeology Studies
- Archaeology and ancient environmental studies
- Climate change and permafrost
- Cryospheric studies and observations
- Remote Sensing and LiDAR Applications
- Forest Ecology and Biodiversity Studies
- Geological Formations and Processes Exploration
- Soil erosion and sediment transport
- Plant responses to elevated CO2
- Atmospheric chemistry and aerosols
- Aeolian processes and effects
- Light effects on plants
TU Wien
2025
Charles University
2015-2024
Abstract The interaction between xylem phenology and climate assesses forest growth productivity carbon storage across biomes under changing environmental conditions. We tested the hypothesis that patterns of wood formation are maintained unaltered despite temperature changes cold ecosystems. Wood microcores were collected weekly or biweekly throughout growing season for periods varying 1 13 years during 1998–2014 cut in transverse sections assessing onset ending phases differentiation. data...
Significance Forest trees can live for hundreds to thousands of years, and they play a critical role in mitigating global warming by fixing approximately 15% anthropogenic CO 2 emissions annually wood formation. However, the environmental factors triggering formation onset springtime cellular mechanisms underlying this remain poorly understood, since forms beneath bark is difficult monitor. We report that Northern Hemisphere conifers driven primarily photoperiod mean annual temperature....
Abstract The phenology of wood formation is a critical process to consider for predicting how trees from the temperate and boreal zones may react climate change. Compared leaf phenology, however, determinism still poorly known. Here, we compared first time three alternative ecophysiological model classes ( threshold models, heat‐sum models chilling‐influenced models) an empirical in their ability predict starting date xylem cell enlargement spring, four major Northern Hemisphere conifers...
Temperate forests are undergoing significant transformations due to the influence of climate change, including varying responses different tree species increasing temperature and drought severity. To comprehensively understand full range growth responses, representative datasets spanning extensive site climatic gradients essential. This study utilizes tree-ring data from 550 sites temperate Czechia assess trends six dominant Central European (European beech, Norway spruce, Scots pine, silver...
Significant alterations of cambial activity might be expected due to climate warming, leading growing season extension and higher growth rates especially in cold-limited forests. However, assessment climate-change-driven trends intra-annual wood formation suffers from the lack direct observations with a timespan exceeding few years. We used Vaganov-Shashkin process-based model to: (i) simulate daily resolved numbers differentiating cells; (ii) develop chronologies onset termination specific...
Despite growing interest in predicting plant phenological shifts, advanced spring phenology by global climate change remains debated. Evidence documenting either small or large advancement of to rising temperature over the spatio-temporal scales implies a potential existence thermal threshold responses forests warming. We collected unique data set xylem cell-wall-thickening onset dates 20 coniferous species covering broad mean annual (MAT) gradient (-3.05 22.9°C) across Northern Hemisphere...
Abstract Inter-annual climatically driven growth variability of above-ground biomass compartments (for example, tree stems and foliage) controls the intensity carbon sequestration into forest ecosystems. However, understanding differences between climatic response stem foliage at landscape level is limited. In this study, we examined climate-growth leaf their relationship for Pinus sylvestris (PISY) Picea abies (PCAB) in topographically complex landscapes. We used tree-ring width...
The easternmost parts of the Hercynian mid-mountains Central Europe, namely Hrubý Jeseník and Králický Sněžník, are characterised by extensive alpine areas at altitudes above approximately 1300 m a.s.l. In order to determine contribution human activities extent these summit grasslands we analysed charcoal assemblages pollen profiles taken from high elevation sites. first burn was dated Iron Age (about second centuries BC), with successive fire events recorded in early Mediaeval epoch about...
CR Climate Research Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsSpecials 55:91-103 (2012) - DOI: https://doi.org/10.3354/cr01122 Growth trends and temperature responses of treeline Norway spruce in Czech-Polish Sudetes Mountains Václav Treml1,*, Tereza Ponocná1, Ulf Büntgen2,3 1Department Physical Geography Geoecology, Charles University, Faculty Science, Albertov 6, 128 43 Prague, Czech Republic...
Abstract Questions What was the main trigger of treeline ecotone advance – rising temperature or agricultural land abandonment? Were triggering factors tree expansion homogeneous did they differ between upper and lower parts ecotone? Location Sudetes Mts., Central Europe (50° N, 15‐17° E). Methods Data were gathered from formed by Picea abies at elevations ranging 1250 to 1490 m. The study area experienced a 1 °C increase over last 100 yr termination cattle grazing grass mowing in first half...
Radial tree growth is sensitive to environmental conditions, making observed increments an important indicator of climate change effects on forest growth. However, unprecedented variability could lead non-stationarity, that is, a decoupling responses from over time, potentially inducing biases in reconstructions and projections. Little known about whether what extent species, model type resolution affect the occurrence magnitude non-stationarity. To systematically assess potential drivers we...
Abstract As major terrestrial carbon sinks, forests play an important role in mitigating climate change. The relationship between the seasonal uptake of and its allocation to woody biomass remains poorly understood, leaving a significant gap our capacity predict sequestration by forests. Here, we compare intra-annual dynamics fluxes wood formation across Northern hemisphere, from assimilation non-structural compounds their incorporation tissues. We show temporally coupled peaks (GPP) cell...
At the landscape scale, response of alpine treelines to increasing temperatures often varies due second-order factors such as terrain properties, vegetation structure, and land use. In this study, we examined influence topographic vegetation-structure variables on spatial patterns treeline ecotone shifts in Sudetes Mountains (Czech Republic). The changing positions timberline were determined from orthogonal aerial images allowing comparisons between 1936 2005. Our results showed that...
Extreme tree growth reductions represent events of abrupt forest productivity decline and carbon sequestration reduction. An increase in their magnitude can an early warning signal impending mortality. Yet the long-term trends extreme remain largely unknown. We analyzed proportion trees exhibiting two Central-European conifer species-Pinus sylvestris (PISY) Picea abies (PCAB)-between 1901 2018. used a novel approach for reduction quantification by relating size to mean recurrence interval....
To enhance our understanding of forest carbon sequestration, climate change mitigation and drought impact on ecosystems, the availability high-resolution annual growth maps based tree-ring width (TRW) would provide a significant advancement to field. Site-specific characteristics, which can be approximated by Earth observation satellites (EOS), emerge as crucial drivers growth, influencing how translates into tree growth. EOS provides information surface reflectance related characteristics...
Abstract. Treeline ecotones in complex mountain landscapes are exposed to pronounced differences irradiation and soil nutrient availability. Different amounts of nutrients direct solar energy can influence tree stem growth resulting variation rates phenology across lower parts treeline ecotone. We hypothesized that at two contrasting sites located on north south-facing slopes, availability outperform temperature modulating while is driven by the course seasonal temperature. To test this...