A5037624529- Insect and Arachnid Ecology and Behavior
- Forest Ecology and Biodiversity Studies
- Plant and animal studies
- Plant Water Relations and Carbon Dynamics
- Mycorrhizal Fungi and Plant Interactions
- Seedling growth and survival studies
- Ecology and Vegetation Dynamics Studies
- Soil Carbon and Nitrogen Dynamics
- Forest Insect Ecology and Management
- Forest Management and Policy
- Peatlands and Wetlands Ecology
- Tree-ring climate responses
- Plant Micronutrient Interactions and Effects
- Plant Parasitism and Resistance
- Plant responses to water stress
- Animal Behavior and Reproduction
- Fungal Biology and Applications
- Coastal wetland ecosystem dynamics
- Plant Diversity and Evolution
- Tree Root and Stability Studies
- Animal and Plant Science Education
- Plant responses to elevated CO2
- Botany and Plant Ecology Studies
- Soil and Unsaturated Flow
- Plant Stress Responses and Tolerance
University of Eastern Finland
2013-2025
Natural Resources Institute Finland
2005-2023
Finland University
2013
Joensuu Science Park
2007-2012
Swiss Federal Institute for Forest, Snow and Landscape Research
2009
Abstract 1. We monitored three different‐sized wood ant ( Formica aquilonia Yarrow) mounds over a 3‐year period in Finnish boreal forests dominated by Norway spruce Picea abies Karst.), to assess the seasonal temperature dependency of activity. Additionally, we also trees around for descending honeydew foragers. 2. The amount collected and prey its composition, as well carbon (C), nitrogen (N), phosphorus (P) invertebrate was investigated. 3. number warm days (average above 20 °C)...
Arbuscular mycorrhizal (AM) plants and fungi associate with lower soil organic matter, higher pH, phosphorus nitrogen than ectomycorrhizal (EM) ones. However, conditions correlate climatic factors, we suggest that temperature humidity have also direct roles in the success of mycorrhiza types. The hypothesis here is EM perform better at low temperatures AM, AM resist drought EM. Narrowleaf cottonwood (Populus angustifolia E. James) forms both We grew seedlings 14, 20 26 °C factorial...
In the first year's data of 10th Finnish National Forest Inventory (2005–2008) 533 active and 178 abandoned ant mounds were found yielding 4.2 ha-1. We 11 species: Formica rufa, F. polyctena, aquilonia, lugubris, pratensis, exsecta, fennica, pressilabris, forsslundi, suecica uralensis. Five species occurred throughout country, four restricted to south. species-specific associations with either mineral soils or mires, forest site type tree-canopy openness. Low fertility decreased occurrence...
Abstract Background and aims Boron (B) deficiency is widespread in boreal forests, but it can be prevented by fertilization. As B reduces root growth, may affect the uptake of other nutrients. We assessed persistence effects a one-time application on growth nutrition Norway spruce ( Picea abies ). Methods A single-tree B-fertilization experiment was established highly productive stand eastern Finland 2000 followed until 2018. The applied dose 2 kg ha −1 . Results After 19 growing seasons,...
Abstract Ants are important components of most soil invertebrate communities, and can affect the flow energy, nutrients water through many terrestrial ecosystems. The vast majority ant species build nests in mineral soil, but a small group ants temperate boreal forests Eurasia North America large parts their above‐ground using organic materials collected from surrounding soil. Many studies have shown that nesting infiltration rates, matter (OM) content, nutrient cycling, much less is known...
Abstract Mound‐building ants ( Formica spp.), as key species, have large impacts on organisms and ecosystem functions in boreal Eurasian forests. The density, sizes locations of ant mounds determine the magnitude spatial distribution activities forest ecosystems. Clear‐cutting can destroy wood colonies, abundance, dimensions may change stand structure changes with age. We compared species composition, mound numbers dimensions, Norway spruce [ Picea abies (L.) Karst.] stands different age (5,...
Red wood ants (Formica rufa group, RWAs) are common insects in boreal forests Fennoscandia, and they build large, long-lived mounds as their nests. RWA enriched with carbon nutrients, but little information is available about how affect root distribution the nutrient uptake of trees. In this study, we investigated biomass, biomass density, concentrations, amounts fine (<2 mm) coarse (>2 roots mounds, compared them those surrounding forest soil mixed coniferous stands different age classes...
Arbuscular mycorrhizas (AMs) prevail in warm and dry climates ectomycorrhizas (EMs) cold humid climates. We suggest that the fungal symbionts benefit their host plants especially corresponding conditions. The hypothesis tested was AM are more drought-resistant than EM or nonmycorrhizal (NM) plants. Grey alder (Alnus incana (L.) Moench) seedlings were inoculated with two species of either fungi none. In one controlled-environment experiment, there a watering drought treatment. Another set not...
The aboveground parts of boreal forest trees mostly grow earlier, and the roots later, in growing season. We aimed to experimentally test whether extrinsic driver soil temperature or intrinsic (resource competition between plant parts) is a more important control for root shoot growth silver birch (Betula pendula Roth) seedlings. Sixteen two-year-old seedlings were grown controlled environment rooms two simulated seasons (GS1, GS2). In GS1, all acclimatized under same conditions, but GS2,...
The relationships between red wood ants ( Formica rufa group) and other ground‐dwelling arthropods were studied in young managed forests stands Eastern Finland. main objectives were: (i) to test the influence of stand type (dominant tree species; age: sapling versus pole stage) numbers on occurrence (ii) study a distance gradient from ant mounds. We used pitfall traps set 5–14‐year‐old 30–45‐year‐old pole‐stage Scots pine Pinus sylvestris L.) birch Betula spp.) forests. Pitfall trap catches...
1 The mutualism between wood ants of the Formica rufa group and aphids living in canopy trees is a widespread phenomenon boreal forests, it can affect tree growth. However, not all forest are involved this interaction. 2 To assess incidence host ant–aphid its spatial distribution we inventoried sample plots with radius 10–15 m around ant mounds 12 stands two age classes (5–12-year-old sapling 30–45-year-old pole stands) dominant species (Scots pine silver birch) Eastern Finland from 2007 to...
The aim was to assess possible benefits or drawbacks of arbuscular-mycorrhizal (AM) and ectomycorrhizal (EM) colonisation compared no mycorrhizas (NM) in seedlings the same host species. Eight broadleaf species were tested for mycorrhiza formation. Grey alder (Alnus incana) four fungal selected further experiments. inoculated with AM fungi Rhizophagus intraradices Glomus hoi EM Paxillus involutus plus an ascomycete isolated from Alnus roots mock-inoculated (NM). formed 70% root tips 30%...
Excess water in the rooting zone critically reduces tree growth and may even kill trees; however, relative importance of damage to roots versus aboveground parts time course are not well understood. We studied dynamics fine-root mortality 7-year-old Scots pine (Pinus sylvestris L.) saplings affected by a 5-week period waterlogging (WL) during growing season. Two out six WL-exposed survived treatment. After 1–2 weeks WL, first-order short (usually mycorrhizas) started increase production...
Tree roots comprise a huge carbon pool. Their dynamics are driven by environmental factors and thereby affected climate change. We studied the effects of soil temperature on root shoot phenology their linkages in Norway spruce (Picea abies (L.) Karst.). Saplings were grown controlled-environment rooms for three simulated growing seasons (GS1, GS2, GS3). Soil-temperature treatments 9, 13, 18, 21 °C applied during GS2. Root growth was monitored with minirhizotrons commenced all simultaneously....
Winter precipitation and soil freeze-thaw events have been predicted to increase in boreal regions with climate change. This may expose tree roots waterlogging (WL) freezing (Fr) more than the current therefore affect growth survival. Using a whole-tree approach, we studied responses of silver birch (Betula pendula Roth.) saplings, growing mineral soil, 6-week Fr WL factorial combinations during dormancy, accompanying changes gas concentrations. Physiological activation (dark-acclimated...