In my laboratory we study the ecology of microorganisms in natural and engineered soil systems. We are interested in the factors that influence the spatial and temporal variability in microbial communities and how the microorganisms, in turn, control biogeochemistry in soil. We are interested in assessing not only the abundance of microorganisms but rather the actively contributing ones in the opaque soil system, and we have a particular interest in comparing the roles of fungi and bacteria in their contribution to biogeochemical cycles.
Recently we have started to use the dependence of microbial growth on environmental factors (e.g. moisture, temperature, pH, salinity, etc) to determine the trait distributions of whole microbial communities in soil. This development has created a causal link between community structure and function, where we can measure the functional consequences of the alignment (or misalignment) of microbial community trait distributions to their environment. The link between microbial communities and their functional contribution has also led to several lines of inquiry where we investigate how microbial resource use-efficiencies (growth efficiencies, C-use efficiencies, N-use efficiencies) depend on environmental factors and perturbations.
Current research themes include soil salinisation (PhD student Kristin Rath, collaborator Prof. Noah Fierer, Univ Colorado), fungal and bacterial decomposition of litter in both aquatic and soil systems (PhD student Margarida Soares), soil pH (PhD student Carla Cruz Paredes, Univ. Copenhagen, PhD student Jian Li), drought and drying-rewetting cycles in soil (PhD student Ainara Leizeaga, postdoc Dr. Lettice Hicks, collaborator Prof. Christine Hawkes, Univ Texas, collaborator Dr. Annelein Meisner, collaborator Prof. Richard Bardgett, Univ Manchester), soil warming in temperate (PhD student Johanna Birgander, collaborator Prof. Serita Frey) and arctic (postdoc Dr. Lettice Hicks, collaborator Prof. Anders Michelsen) ecosystems, and effects of insect herbivory on the soil N cycle in arctic ecosystems (PhD student Jeppe Ågård Kristensen, collaborator Dr. Dan Metcalfe). Recently, we have also started to integrate insights into the environmental controls of microbial processes into biogeochemical models at Ecosystem and global scales (collaborators Dr. David Wårlind, Dr. Paul Miller, and PhD student Adrian Gustafsson).
I am looking for a postdoc to work on a project dedicated to incorporating microbial ecology insights into biogeochemical models. Very exciting! https://lu.mynetworkglobal.com/en/what:job/jobID:157676/ (last day of application Sep 14, 2017)
Retrieved from Lund University's publications database
- Ecotoxicological assessment of propiconazole using soil bacterial and fungal growth assays
- Partial drying accelerates bacterial growth recovery to rewetting
- The impact of salinity on the microbial response to drying and rewetting in soil
- Using community trait-distributions to assign microbial responses to pH changes and Cd in forest soils treated with wood ash
- Warmer winters increase the rhizosphere carbon flow to mycorrhizal fungi more than to other microorganisms in a temperate grassland
- Bacterial and fungal colonization and decomposition of submerged plant litter: consequences for biogenic silica dissolution.
- Biomass or growth? How to measure soil food webs to understand structure and function
- Comparative toxicity of salts to microbial processes in soil.
- Functional implications of the pH-trait distribution of the microbial community in a re-inoculation experiment across a pH gradient
- Microbial control of soil organic matter mineralization responses to labile carbon in subarctic climate change treatments
- Microbial-mediated redistribution of ecosystem nitrogen cycling can delay progressive nitrogen limitation
- Priming of the decomposition of ageing soil organic matter: concentration dependence and microbial control
- Prolonged drought changes the bacterial growth response to rewetting
- Revisiting the hypothesis that fungal-to-bacterial dominance characterizes turnover of soil organic matter and nutrients
- Salt effects on the soil microbial decomposer community and their role in organic carbon cycling: A review
- Comparison of fertility and seasonal effects on grassland microbial communities
- Microbial regulation of global biogeochemical cycles.
- The effects of glucose loading rates on bacterial and fungal growth in soil
- Using the concentration-dependence of respiration arising from glucose addition to estimate in situ concentrations of labile carbon in grassland soil
- Bacterial growth and growth-limiting nutrients following chronic nitrogen additions to a hardwood forest soil
- Bacterial growth and respiration responses upon rewetting dry forest soils: Impact of drought-legacy
- Feather moss nitrogen acquisition across natural fertility gradients in boreal forests
- Grazing effects on microbial community composition, growth and nutrient cycling in salt marsh and sand dune grasslands
- Investigating the long-term legacy of drought and warming on the soil microbial community across five European shrubland ecosystems.
- Microbial growth responses upon rewetting soil dried for four days or one year
- Temperature adaptation of bacterial growth and C-14-glucose mineralisation in a laboratory study
- The Cyanobacterial Role in the Resistance of Feather Mosses to Decomposition-Toward a New Hypothesis
- Transient biochar effects on decomposer microbial growth rates: evidence from two agricultural case-studies
- Activity of temperate grassland plants and symbiotic fungi during the winter - implications for community structure and carbon cycling in a changing climate
- Archaeal abundance across a pH gradient in an arable soil and its relationship with bacterial and fungal growth rates.
- Biochar-mediated changes in soil quality and plant growth in a three year field trial
- Comparative Toxicity of Nanoparticulate CuO and ZnO to Soil Bacterial Communities
- Fungal and bacterial growth following the application of slurry and anaerobic digestate of livestock manure to temperate pasture soils
- Mineralization of low molecular weight carbon substrates in soil solution under laboratory and field conditions
- N-2 Fixation in Feather Mosses is a Sensitive Indicator of N Deposition in Boreal Forests
- Nutrient dynamics, microbial growth and weed emergence in biochar amended soil are influenced by time since application and reapplication rate
- Temperature adaptation of bacterial communities in experimentally warmed forest soils
- Bacterial pH-optima for growth track soil pH, but are higher than expected at low pH
- Bacterial salt tolerance is unrelated to soil salinity across an arid agroecosystem salinity gradient
- Effects of soil frost on growth, composition and respiration of the soil microbial decomposer community
- Fungal and bacterial growth responses to N fertilization and pH in the 150-year 'Park Grass' UK grassland experiment.
- Fungal and bacterial recolonisation of acid and alkaline forest soils following artificial heat treatments
- Growth of saprotrophic fungi and bacteria in soil.
- Lack of Correlation between Turnover of Low-Molecular-Weight Dissolved Organic Carbon and Differences in Microbial Community Composition or Growth across a Soil pH Gradient
- Microbial growth rate measurements reveal that land-use abandonment promotes a fungal dominance of SOM decomposition in grazed Mediterranean ecosystems
- Abundance, production and stabilization of microbial biomass under conventional and reduced tillage
- Considering fungal:bacterial dominance in soils - Methods, controls, and ecosystem implications
- Drying-Rewetting Cycles Affect Fungal and Bacterial Growth Differently in an Arable Soil
- Investigating the mechanisms for the opposing pH relationships of fungal and bacterial growth in soil
- Loss of low molecular weight dissolved organic carbon (DOC) and nitrogen (DON) in H2O and 0.5 M K2SO4 soil extracts
- Soil bacterial and fungal communities across a pH gradient in an arable soil.
- The microbial PLFA composition as affected by pH in an arable soil
- Adaptation of soil microbial communities to temperature: comparison of fungi and bacteria in a laboratory experiment
- Contrasting Short-Term Antibiotic Effects on Respiration and Bacterial Growth Compromises the Validity of the Selective Respiratory Inhibition Technique to Distinguish Fungi and Bacteria.
- Contrasting Soil pH Effects on Fungal and Bacterial Growth Suggest Functional Redundancy in Carbon Mineralization
- Growth measurements of saprotrophic fungi and bacteria reveal differences between canopy and forest floor soils
- On the Ecology of Saprotrophic Fungi and Bacteria in Soil: Biotic and Abiotic Control of Growth Rates
- Temperature adaptation of soil bacterial communities along an Antarctic climate gradient: predicting responses to climate warming
- Carbon drivers and microbial agents of soil respiration
- Effect of environmental factors on fungal and bacterial growth in soil
- Interaction between fungi and bacteria in soil
- Microbial carbon-use efficiency
Doctoral students and postdocs
PhD students, main supervisor
PhD students, assistant supervisor
- Johanna Birgander
- Carlos Arellano
- Jeppe Ågård Kristensen, Dept of Physical Geography and Ecosystems Science
- Jian Li