Search results for: Christian Ginzler

Items from 1 to 20 out of 25 results

article

Factors determining bryophyte species richness and community composition on insular siliceous erratic boulders in calcareous landscapes

Daniel Hepenstrick, Ariel Bergamini, Clare Webster, Christian Ginzler, more

Journal of Vegetation Science > 32 > 6 > n/a - n/a

Aim Pleistocene erratic boulders are rocks that were relocated by glaciers during the Ice Ages. When their geology differs from the geology of the landscape that surrounds them, erratic boulders form habitat islands for regionally rare, edaphically specialised, rock‐dwelling cryptogams (bryophytes, ferns and lichens). Such boulders constitute terrestrial model systems for exploring island biogeographic...

article

Drone‐based physiological index reveals long‐term acclimation and drought stress responses in trees

Petra D'Odorico, Leonie Schönbeck, Valentina Vitali, Katrin Meusburger, more

Plant, Cell & Environment > 44 > 11 > 3552 - 3570

Monitoring early tree physiological responses to drought is key to understanding progressive impacts of drought on forests and identifying resilient species. We combined drone‐based multispectral remote sensing with measurements of tree physiology and environmental parameters over two growing seasons in a 100‐y‐old Pinus sylvestris forest subject to 17‐y of precipitation manipulation. Our goal was...

article

Large‐scale early‐wilting response of Central European forests to the 2018 extreme drought

Philipp Brun, Achilleas Psomas, Christian Ginzler, Wilfried Thuiller, more

Global Change Biology > 26 > 12 > 7021 - 7035

The combination of drought and heat affects forest ecosystems by deteriorating the health of trees, which can lead to large‐scale die‐offs with consequences on biodiversity, the carbon cycle, and wood production. It is thus crucial to understand how drought events affect tree health and which factors determine forest susceptibility and resilience. We analyze the response of Central European forests...

article

Spatial modelling of ecological indicator values improves predictions of plant distributions in complex landscapes

Patrice Descombes, Lorenz Walthert, Andri Baltensweiler, Reto Giulio Meuli, more

Ecography > 43 > 10 > 1448 - 1463

Ecologically meaningful predictors are often neglected in plant distribution studies, resulting in incomplete niche quantification and low predictive power of species distribution models (SDMs). Because environmental data are rare and expensive to collect, and because their relationship with local climatic and topographic conditions are complex, mapping them over large geographic extents and at high...

article

Forest history and epiphytic lichens: Testing indicators for assessing forest autochthony in Switzerland

Lyudmyla Dymytrova, Urs-Beat Brändli, Christian Ginzler, Christoph Scheidegger

Ecological Indicators > 2018 > 84 > C > 847-857

Epiphytic lichens are widely used to indicate old undisturbed forest stands with a long forest history that are of outstanding interest for biodiversity conservation. Swiss forest stands without any significant human impact like clear-cut or afforestation that have natural tree species composition and a continuous forest cover during the last 120 years are considered to be autochthonous. In this study...

article

Towards a comprehensive social and natural scientific forest-recreation monitoring instrument—A prototypical approach

K. Tessa Hegetschweiler, Christiane Plum, Christoph Fischer, Urs-Beat Brändli, more

Landscape and Urban Planning > 2017 > 167 > C > 84-97

Forest policy planning and broad-scale management is often based on forest inventory data in many countries. However, the importance of social aspects such as aesthetic and recreational values is increasing, especially in urban areas, and need to be considered in forestry practice. We conducted a forest visitor survey at selected National Forest Inventory (NFI) sample plots in order to test whether...

article

An annually-resolved stem growth tool based on 3D laser scans and 2D tree-ring data

Bettina Wagner, Christian Ginzler, Anton Bürgi, Silvia Santini, more

Trees > 2018 > 32 > 1 > 125-136

Key message The combination of terrestrial laser scans and tree-ring data allows for a highly precise reconstruction of annual stem growth, and thus complex tree-growth analyses independent of species and site characteristics. Abstract Reliable carbon pools data are needed to quantify the carbon stored in ecosystems and for effective forest management. Terrestrial laser scanning allows researchers...

article

Terrestrial laser scanning improves digital elevation models and topsoil pH modelling in regions with complex topography and dense vegetation

Andri Baltensweiler, Lorenz Walthert, Christian Ginzler, Flurin Sutter, more

Environmental Modelling & Software > 2017 > 95 > C > 13-21

Terrestrial Laser Scanning (TLS) has great potential in creating high resolution digital elevation models (DEMs). However, little is known about the properties of TLS derived DEMs covering several hectares in heterogeneous environments compared to conventional airborne laser scanning (ALS) based models and their influence on derived products. We investigated the accuracy of DEMs with different resolutions...

article

Environmental predictors of species richness in forest landscapes: abiotic factors versus vegetation structure

Florian Zellweger, Andri Baltensweiler, Christian Ginzler, Tobias Roth, more

Journal of Biogeography > 43 > 6 > 1080 - 1090

AimTo investigate the performance and relative importance of abiotic and biotic predictors of species richness of three taxa in forest‐dominated landscapes across an environmentally heterogeneous mountain region. LocationSwitzerland (central Europe). MethodsWe used a broad set of nationally available environmental predictors grouped into (1) climate, (2) topography and soil and (3) 3‐D vegetation...

article

Using remote-sensing data to assess habitat selection of a declining passerine at two spatial scales

Nica Huber, Felix Kienast, Christian Ginzler, Gilberto Pasinelli

Landscape Ecology > 2016 > 31 > 9 > 1919-1937

Context Detailed information on habitat needs is integral to identify conservation measures for declining species. However, field data on habitat structure is typically limited in extent. Remote sensing has the potential to overcome these limitations of field-based studies. Objective We aimed to assess abiotic and biotic characteristics of territories used by the declining wood warbler (Phylloscopus sibilatrix...

article

Forest-structure data improve distribution models of threatened habitat specialists: Implications for conservation of epiphytic lichens in forest landscapes

Lyudmyla Dymytrova, Silvia Stofer, Christian Ginzler, Frank T. Breiner, more

Biological Conservation > 2016 > 196 > C > 31-38

Epiphytic lichens are an important component of forest biodiversity. Many of them are threatened and conservation planning therefore requires comprehensive information about their distribution over space and time. However, besides topo-climatic predictors, the spatial pattern of epiphytic lichens is also closely related to the tree characteristics on which they grow. In this paper, we tested the hypothesis...

article

Scale effects in survey estimates of proportions and quantiles of per unit area attributes

Steen Magnussen, Daniel Mandallaz, Adrian Lanz, Christian Ginzler, more

Forest Ecology and Management > 2016 > 364 > C > 122-129

Quantiles and proportions in a sampling distribution of a per unit area attribute (Y) depend on the spatial support (area) of employed survey plots. This is a nuisance for managers, and policy developers; in particular when the underlying data have been collected with different spatial supports. Users of these statistics may wish to calibrate their estimates to a common scale of spatial support. The...

article

Evaluating forest transition based on a multi-scale approach: forest area dynamics in Switzerland 1850–2000

Christin Loran, Christian Ginzler, Matthias Bürgi

Regional Environmental Change > 2016 > 16 > 6 > 1807-1818

A trend of forest area expansion after decades of decline is taking place in many countries around the globe. In Switzerland, forest cover has been expanding since at least the mid-nineteenth century. However, little is known about the patterns of forest area dynamics on a long-term, national scale, nor regarding the precise time of forest transition (FT). In the present study, we reconstruct the...

article

Future landscapes of Switzerland: Risk areas for urbanisation and land abandonment

Bronwyn Price, Felix Kienast, Irmi Seidl, Christian Ginzler, more

Applied Geography > 2015 > 57 > Complete > 32-41

In Switzerland, the decreasing significance of agriculture has led to prominent processes of land abandonment in mountainous areas where the maintenance of open land relies on human intervention. At the same time, urbanisation in Switzerland is increasing at a rapid rate at the expense of other land use types, particularly open land agriculture. In spite of these observed trends, the extent and location...

article

Drought-induced weakening of growth–temperature associations in high-elevation Iberian pines

J. Diego Galván, Ulf Büntgen, Christian Ginzler, Håkan Grudd, more

Global and Planetary Change > 2015 > 124 > C > 95-106

The growth/climate relationship of theoretically temperature-controlled high-elevation forests has been demonstrated to weaken over recent decades. This is likely due to new tree growth limiting factors, such as an increasing drought risk for ecosystem functioning and productivity across the Mediterranean Basin. In addition, declining tree growth sensitivity to spring temperature may emerge in response...

article

Accuracy assessment of airborne photogrammetrically derived high-resolution digital elevation models in a high mountain environment

Johann Müller, Isabelle Gärtner-Roer, Patrick Thee, Christian Ginzler

ISPRS Journal of Photogrammetry and Remote Sensing > 2014 > 98 > Complete > 58-69

High-resolution digital elevation models (DEMs) generated by airborne remote sensing are frequently used to analyze landform structures (monotemporal) and geomorphological processes (multitemporal) in remote areas or areas of extreme terrain. In order to assess and quantify such structures and processes it is necessary to know the absolute accuracy of the available DEMs. This study assesses the absolute...

article

Combining ensemble modeling and remote sensing for mapping individual tree species at high spatial resolution

Robin Engler, Lars T. Waser, Niklaus E. Zimmermann, Marcus Schaub, more

Forest Ecology and Management > 2013 > 310 > Complete > 64-73

The ability to map vegetation and in particular individual trees is a key component in forest management and long-term forest monitoring. Here we present a novel approach for mapping individual tree species based on ensemble modeling, i.e. combining the projections of several modeling techniques in order to reduce uncertainty. Using statistical modeling in conjunction with high-resolution aerial imagery...

article

Driving factors of a vegetation shift from Scots pine to pubescent oak in dry Alpine forests

Andreas Rigling, Christof Bigler, Britta Eilmann, Elisabeth Feldmeyer‐Christe, more

Global Change Biology > 19 > 1 > 229 - 240

An increasing number of studies have reported on forest declines and vegetation shifts triggered by drought. In the Swiss Rhone valley (Valais), one of the driest inner‐Alpine regions, the species composition in low elevation forests is changing: The sub‐boreal Scots pine (Pinus sylvestris L.) dominating the dry forests is showing high mortality rates. Concurrently the sub‐Mediterranean pubescent...

article

High Resolution DEM Generation in High‐Alpine Terrain Using Airborne Remote Sensing Techniques

Yves Bühler, Mauro Marty, Christian Ginzler

Transactions in GIS > 16 > 5 > 635 - 647

Up‐to‐date and accurate digital elevation models (DEMs) are essential for many applications such as numerical modeling of mass movements or mapping of terrain changes. Today the Federal Department of Topography, swisstopo, provides Digital Terrain Models (DTMs) and Digital Surface Models (DSMs) derived from airborne LiDAR data with a high spatial resolution of 2 m covering the entire area of Switzerland...

article

Relating remotely sensed forest damage data to wind data: storms Lothar (1999) and Vivian (1990) in Switzerland

Tilo Usbeck, Peter Waldner, Matthias Dobbertin, Christian Ginzler, more

Theoretical and Applied Climatology > 2012 > 108 > 3-4 > 451-462

This study compares the surface wind speed and forest damage data of two exceptionally severe winter storms, Vivian 1990 and Lothar 1999. The study area comprises the region that suffered damage in Switzerland. The wind speed data were derived from simulations of MeteoSwiss (Federal Office of Meteorology and Climatology), measurements during the storm periods and expert analyses of the data. The remotely...

Publication date

Last 3 years (2)

Close

Date range setting

Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.

From:

To:
Set your own date range

INFONA - science communication portal

Search results for: Christian Ginzler

Factors determining bryophyte species richness and community composition on insular siliceous erratic boulders in calcareous landscapes

Drone‐based physiological index reveals long‐term acclimation and drought stress responses in trees

Large‐scale early‐wilting response of Central European forests to the 2018 extreme drought

Spatial modelling of ecological indicator values improves predictions of plant distributions in complex landscapes

Forest history and epiphytic lichens: Testing indicators for assessing forest autochthony in Switzerland

Towards a comprehensive social and natural scientific forest-recreation monitoring instrument—A prototypical approach

An annually-resolved stem growth tool based on 3D laser scans and 2D tree-ring data

Terrestrial laser scanning improves digital elevation models and topsoil pH modelling in regions with complex topography and dense vegetation

Environmental predictors of species richness in forest landscapes: abiotic factors versus vegetation structure

Using remote-sensing data to assess habitat selection of a declining passerine at two spatial scales

Forest-structure data improve distribution models of threatened habitat specialists: Implications for conservation of epiphytic lichens in forest landscapes

Scale effects in survey estimates of proportions and quantiles of per unit area attributes

Evaluating forest transition based on a multi-scale approach: forest area dynamics in Switzerland 1850–2000

Future landscapes of Switzerland: Risk areas for urbanisation and land abandonment

Drought-induced weakening of growth–temperature associations in high-elevation Iberian pines

Accuracy assessment of airborne photogrammetrically derived high-resolution digital elevation models in a high mountain environment

Combining ensemble modeling and remote sensing for mapping individual tree species at high spatial resolution

Driving factors of a vegetation shift from Scots pine to pubescent oak in dry Alpine forests

High Resolution DEM Generation in High‐Alpine Terrain Using Airborne Remote Sensing Techniques

Relating remotely sensed forest damage data to wind data: storms Lothar (1999) and Vivian (1990) in Switzerland

Filter options

Publication date

Publication type

Keywords

Data set

Journal

INFONA - science communication portal

Search results for: Christian Ginzler

Add recipient

Sending message cancelled

Are you sure you want to cancel sending this message?

Send message

Filter options

Publication date

Date range setting

Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.

Publication type

Keywords

Data set

Journal

Reporting an error / abuse

Sending the report failed

Accessibility options