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[ID: 526] BIOGEOMON
PI: Kim Lindgren
The BIOGEOMON conference is an open, interdisciplinary forum for sharing the latest discoveries and exploring future directions in ecosystem biogeochemistry. We especially encourage participation from early career scientists and graduate students, fostering collaboration and fresh perspectives in this growing field.
[ID: 525] Övervakning av Skarp tandad barkborre
PI: Mikael Andersson
Fångst av Skarptandad barkborre för att kartlägga förekomst.
[ID: 524] Biocomp 2 - Fungi-insect interactions on wood decomposition
PI: Fredrik Sjödin
BIOCOMP Module 2: Fungi-insect interactions and their effects on wood decomposition in different climate zones. Varianter på utläggning av död tallved för att studera svamp- och insektskolonisering. Forskare Joakim Hjältén och Anne-Maarit Hekkala.
wood decompositionfungiinsectspinedead wooddöd vednedbrytningsvampinsekter
[ID: 523] Granbarkborrens diapaus
PI: Mikael Andersson
Granbarkborren är den viktigaste skadegöraren på gran i Europa och skadorna har ökat kraftigt under de senaste decennierna. Denna ökning förväntas fortsätta som ett resultat av ett allt varmare klimat. Ett varmare klimat innebär att antalet barkborregenerationer per sommar kommer att öka vilket innebär ökad risk för skador. Granbarkborren måste hinna utvecklas till adulter innan övervintringen. Därför utnyttjar den nya generationen dagslängden för att avgöra om de skall föröka sig samma sommar som de utvecklats, eller gå i reproduktiv diapaus (dvs först övervintra innan de förökar sig nästa sommar).
[ID: 522] Bränning Åheden
PI: Fredrik Sjödin
Bränningsförsök och demo på Svartbergetsförsökspark område Åheden med forskare Anders Granström.
[ID: 521] 9802 Jädraås: Nutrient Optimization Fertilization (IH2)
PI: Hyungwoo Lim
Nitrogen fertilization generally increases tree productivity in boreal forests. In mature forests, however, the growth response typically lasts less than 10 years after fertilization. We hypothesized that long-term annual fertilization in young forests could permanently shift ecosystem functioning, maintaining increased productivity through improved nitrogen cycling even after fertilization ceases. To test this hypothesis, we used a long-term fertilization experiment in a Scots pine (Pinus sylvestris) forest in Jädraås, Sweden. Annual fertilization combined with irrigation was applied for 15 years from 1974 to 1990. We assessed foliar nutrient concentrations, tree growth, and soil nutrient stocks, with final tree measurements conducted in 2024.
[ID: 520] Test av mekaniska plantskydd. Uppdrag Södra 2026
PI: Stefan Eriksson
Test av mekaniska plantskydd mot snytbaggeskador. Anlagt på uppdrag av Södra 2026.
[ID: 519] Norway spruce and Scots pine fungal and bacterial microbiomes in a boreal forest common garden experiment
Sequencing of bacterial and fungal microbiomes in Scots pine and Norway spruce soil and needle samples collected at the Svartberget common tree garden experiment site
[ID: 518] Tall-tower measurements of the boreal forest GHG balance
PI: Matthias Peichl
In this project we conduct tall tower EC measurements at the ICOS Svartberget station to quantify the landscape-scale fluxes of CO2, CH4 and H20.
[ID: 517] Predicting tree population growth rates from plant functional traits, nutrient acquisition strategies, and climate
PI: Maria Martell
For over a century, ecologists have sought to understand how plant strategies enable populations to persist and thrive under specific environmental conditions, including water and nutrient acquisition strategies - especially those mediated through associations with mycorrhizal fungi. Plant strategies can be understood through the connection between (i) population growth, (ii) functional traits, and (iii) the environment. (Laughlin et al., 2020; Siefert & Laughlin, 2023), integrating individual- and population-level processes, and providing a clearer understanding of how traits influence growth at both scales. However, the relationship between traits and population fitness is not universal, it depends on the abiotic environmental context, including both atmospheric and soil conditions. By simultaneously considering plant functional traits, population growth across species, and abiotic environmental variation, we can integrate functional ecology and population ecology. Although nutrient acquisition strategies vary within and among mycorrhizal types, general patterns exist: arbuscular mycorrhizal fungi (AMF) typically scavenge soluble inorganic soil phosphorus and nitrogen, whereas ectomycorrhizal fungi (EcMF) rely on specialized extracellular enzymes to extract nutrients, particularly organic nitrogen and phosphorus from complex sources. However, how these contrasting mycorrhizal association types shape individual and population growth across different abiotic environmental contexts remains an open and understudied question. Recent work by Augusto et al. (2025) has challenged the traditional fast–slow plant economic spectrum. In field studies, they found that acquisitive tree species often grow slowly under natural conditions. Their results showed negative correlations between tree growth and traits such as leaf nitrogen content (Nmass), specific leaf area (SLA), specific root length (SRL), and mass-based maximum photosynthetic rate (Amax). They interpreted this mismatch as the outcome of environmental constraints: conservative species grew better in stressful conditions due to greater tolerance, while acquisitive species only grew well in environments with high soil fertility and ample moisture. 2 Here, we propose a complementary framework, beyond the classic fast-slow plant economic spectrum, to explain these findings, grounded in eco-evolutionary optimality theory (Wright et al., 2003; Wang et al., 2017; Franklin et al., 2020; Harrison et al., 2021). This approach introduces the idea of carbon cost relative to carbon gain, integrating nutrient acquisition strategies - particularly those shaped by mycorrhizal associations - with environmental constraints. By linking trait expression and population growth to resource economics and mycorrhizal type, we can better predict when and why certain functional strategies succeed across abiotic environmental gradients. Building on this foundation, our recent work demonstrated that nutrient acquisition strategies shape the trade-off between carbon costs of nutrient acquisition relative to water acquisition and soil resource availability (Cheaib et al., 2025b,a). Specifically, we found that the correlations between the carbon costs of nutrient acquisition relative to water acquisition, and soil nutrient concentrations (nitrogen and phosphorus), varies systematically with the type of mycorrhizal association and local abiotic environmental conditions. A key insight from our study is the role of soil carbon-to-nitrogen (C:N) ratios in determining the relative advantage of different strategies. Under high soil C:N ratios reflecting low soil N availability, tree species associated with ectomycorrhizal (EcMF) and ericoid mycorrhizal fungi were able to reduce carbon costs relative to species associated with arbuscular mycorrhizal fungi (AMF) by accessing organic nitrogen sources. In contrast, under low soil C:N ratios reflecting high soil N availability, species associated with AMF were able to reduce carbon costs relative to species EcMF-associated species by efficiently absorbing soluble inorganic nitrogen. These findings highlight the dynamic nature of plant-soil-atmosphere interactions and suggest that advantages or disadvantages of a given nutrient acquisition strategy are not fixed in space, but context-dependent. In this proposal, we aim to apply these insights - together with new analyses and additional datasets - to revisit and reinterpret the results of Augusto et al. (2025). By framing their observed trait–growth relationships within an eco-evolutionary optimality perspective, and explicitly incorporating nutrient acquisition strategies, we may uncover deeper mechanisms driving population-level growth rates across abiotic environmental gradients. This approach promises to bridge physiological ecology, population dynamics, and mycorrhizal symbiosis within a unified predictive framework.
[ID: 516] SKS Hyggesfritt och skador
PI: Martin Goude
Uppdrag från Skogsstyrelsen att ta fram en rapport/kunskapssammanställning om hyggesfritt och skador. Adriana Puentes och Martin Goude är projektledare och arbetar tillsammans med analytiker på Skogsskadecentrum.
[ID: 515] Arvidsjaur FIRE chronosequence
PI: Michael Gundale
Society is actively debating the role of rotational forestry in delivering a multitude of ecosystem services, including biomass production, biodiversity, and climate benefits. These debates are based on incomplete information about how these ecosystem services are delivered across the full rotational time scale of managed forests relative to young and old natural forests over comparable timescales. Key knowledge gaps our research will fill include: a) How do key ecosystem services change over time in response to rotation forestry compared to recovery from wildfire? b) How does rotational forestry impact these ecosystem services relative to unmanaged primary Swedish forests (i.e. old growth forests)? c) At what time point during rotational forestry are break-even points achieved for key ecosystem services, such that potential trade-offs between productivity, climate benefits, and biodiversity are minimized? To achieve this we will measure ecosystem services across two contrasting forest age gradients, one wildfire recovery gradient (spanning 3 and 370 years since stand replacing wildfire) and one rotation forestry gradient (spanning the full age spectrum of a typical 100-year rotation period). The project will deliver the exact data needed to help resolve societal debates regarding forest ecosystem services, as well as empower key forest stakeholders to more optimally manage forests for the climate transition.