A5061869508- Tree Root and Stability Studies
- Forest ecology and management
- Plant Water Relations and Carbon Dynamics
- Seedling growth and survival studies
- Aeolian processes and effects
- Forest Management and Policy
- Plant responses to water stress
- Ecology and Vegetation Dynamics Studies
- Soil Management and Crop Yield
- Forest Biomass Utilization and Management
- Soil Mechanics and Vehicle Dynamics
- Forest Ecology and Biodiversity Studies
- Forest Insect Ecology and Management
- Soil erosion and sediment transport
- Land Use and Ecosystem Services
- Plant Reproductive Biology
- Plant Surface Properties and Treatments
- Fire effects on ecosystems
- Soil and Water Nutrient Dynamics
- Greenhouse Technology and Climate Control
- Plant Molecular Biology Research
- Bioenergy crop production and management
- Rural development and sustainability
- Remote Sensing and LiDAR Applications
- Plant Taxonomy and Phylogenetics
Forest Research
2013-2024
University of Dundee
2018-2022
Northern Research Station
1998-2015
Czech Technical University in Prague
2010
Université Laval
2009
Forestry Commission England
1991-2000
United States Department of the Navy
2000
Recent studies projecting future climate change impacts on forests mainly consider either the effects of productivity or disturbances. However, and disturbances are intrinsically linked because 1) directly affect forest (e.g. via a reduction in leaf area, growing stock resource-use efficiency), 2) disturbance susceptibility is often coupled to certain development phase with determining time this specific susceptibility. The objective paper provide an overview changes different regions Europe...
Soil-root plate dimensions and structural root architecture were examined on 46-year-old Sitka spruce (Picea sitchensis (Bong.) Carr.) trees that had been mechanically uprooted. Rooting depth was restricted by a water table, system morphology adapted to resist the wind movement associated with shallow rooting. The spread of ratio mass shoot (root/shoot ratio) both negatively related soil-root depth. Root systems more leeward side than windward tree relative prevailing direction. Cross...
A database was constructed of tree-anchorage measurements from almost 2000 trees 12 conifer species that were mechanically overturned on 34 sites in the United Kingdom between 1960 and 2000. Anchorage compared among species, soil groups (freely-draining mineral, gleyed peaty deep peat) root depth classes (shallow, <40 cm; medium, 40–80 deep, >80 cm) using regressions critical turning moment against stem mass. Sitka spruce (Picea sitchensis (Bong.) Carr.) used as a benchmark because it...
Predicting the probability of wind damage in both natural and managed forests is important for understanding forest ecosystem functioning, environmental impact storms risk management. We undertook a thorough validation three versions hybrid-mechanistic model, ForestGALES, statistical logistic regression against observed Scottish upland conifer following major storm. Statistical analysis demonstrated that increasing tree height local speed during storm were main factors associated with...
Stability was tested on 46-year-old Sitka spruce trees (over 20 m tall) growing gleyed soils. Trees with a range of root depths peaty gley and surface-water soils were selected by studying their water regime. pulled over horizontally winch the vertical displacement soil-root plate measured as load applied. The resistive turning moment at point soil failure maximum measured. Thin plates, which developed shallow table, had greater surface area than thick plates that deeper tables. However,...
Knowledge of belowground structures and processes is essential for understanding predicting ecosystem functioning, consequently in the development adaptive strategies to safeguard production from trees woody plants into future. In past, research has mainly been concentrated on growth models prediction agronomic or forest production. Newly emerging scientific challenges, e.g. climate change sustainable development, call new integrated predictive methods where root systems will become a key...
Trees are known to modify their growth in windy climates, but these responses have not previously been linked alterations anchorage strength. The effects of stem mass, soil group, rooting depth and wind exposure (Detailed Aspect Method Scoring (DAMS)) on were modelled using data from experiments where Sitka spruce (Picea sitchensis (Bong.) Carr.) trees had mechanically overturned. Regressions critical turning moment against mass performed combinations group (mineral, gleyed mineral, peaty...
To compare the provision of ecosystem services in plantation forests under alternative climate change adaptation management trajectories, we interpolated climatic variables from UK 11-member regional models to use at high resolution forest situations. We used expert opinion derive links between coarse-scaled National Ecosystem Assessment scenarios and alternatives (FMA) a simulation planning uncertainty. Nine indicators were four trajectories based on FMA types changing climate. These show...
Une machine a « secouer les arbres » ete mise en place pour etudier influences d'une perturbation dynamique sur la croissance d'Epinette de Sitka (Picea sitchensis (Bong.) Carr.). Dix clones huit plantes chacun ont secoues pendant 196 jours, cote reference non perturbees. Les soumis deux regimes d'alimentation afin determiner l'influence nutrition minerale leur comportement mecanique. Aucun effet significatif biomasse tige n'a observe et hauteur des soumises au regime le plus eleve semble...
The anchorage of 40-year-old Sitka spruce (Picea sitchensis (Bong.) Carr.) trees grown in a plantation on steep (ca. 30°) slope was compared with that an adjacent horizontal area. There similar gleyed mineral soil the sloping and areas. Trees were mechanically overturned using winch, quantified by measuring load, stem angle, tree dimensions. upslope, downslope, or across-slope. Critical turning moments calculated around base actual hinge point. wind speeds required to uproot snap this stand...
Jactel, H., M. Branco, P. Duncker, B. Gardiner, W. Grodzki, Langstrom, F. Moreira, S. Netherer, Nicoll, C. Orazio, D. Piou, Schelhaas, and K. Tojic. 2012. A multicriteria risk analysis to evaluate impacts of forest management alternatives on health in Europe. Ecology Society 17(4): 52. https://doi.org/10.5751/ES-04897-170452
When forest stands are thinned, the retained trees exposed to increased light and greater mechanical strain from wind. The consequent availability of photosynthate localised in stems roots both known increase cambial growth conifers, but their relative importance has not previously been quantified. Light wind movement were manipulated a 10-year-old stand Sitka spruce on an upland site. Treatments “Control”—no change spacing or loading; “Thinned”—light loading by removing neighbouring trees;...
Mechanical root reinforcement is an important parameter to evaluate for stability analysis of rooted slopes. The contribution roots however difficult quantify in situ without time-consuming methods or heavy equipment. Here we report field testing using the newly developed “corkscrew” method at two different sites with plantings conifers and blackcurrant. In both found positive correlations between quantity surface layers where many were found. Below 125 mm depth, no could be found, probably...
Understanding the stability of trees under lateral loads arising from natural hazards (e.g. extreme weather and debris flows) is important, as fallen can become a potential threat to life infrastructure. Two 1 : 20 scale three-dimensional printed analogue root system models, with architectures field-surveyed architecture data, were used simulate push-over behaviour in silty sand different conditions centrifuge. The peak overturning moments obtained verified against data field winching tests....