Increased temperatures and changes in vegetation patterns are expected to dramatically alter northern ecosystems the next few decades. Little is known about how this translates into relative rates of formation and decomposition of soil organic carbon (C), but a general belief is that increasing temperatures and rising concentrations of atmospheric CO2 will be partly mitigated by elevated C sequestration.
However, results from CO2 fertilization and warming experiments vary widely between prolonged, temporary and no stimulation of plant growth and C sequestration. There is therefore a discrepancy between theory and data. Why is this? One answer is that current theories and models fail to accurately address three major factors of importance for C cycling and sequestration:
- Links between above- and below ground biota and process rates
- The stoichiometric coupling of C and N cycles
- Priming effects
My research aims at resolving the importance of these factors. More specifically I aim at identifying links between above ground biota and below ground C and N turnover, but also to determine the relative importance of fungi, bacteria and archaea for the same processes, and the ways in which this is modulated.
Retrieved from Lund University's publications database
- Does exogenous carbon extend the realized niche of canopy lichens? Evidence from sub-boreal forests in British Columbia
- Possible roles of reactive chlorine II: assessing biotic chlorination as a way for organisms to handle oxygen stress.
- Spatial variability of soil fungal and bacterial abundance: Consequences for carbon turnover along a transition from a forested to clear-cut site
- Archaeal abundance across a pH gradient in an arable soil and its relationship with bacterial and fungal growth rates.
- Archaeal abundance in relation to root and fungal exudation rates
- Evidence of a strong coupling between root exudation, C and N availability, and stimulated SOM decomposition caused by rhizosphere priming effects
- Rapid turnover of DOC in temperate forests accounts for increased CO2 production at elevated temperatures
- Regulation of decomposition and methane dynamics across natural, commercially mined, and restored northern peatlands
- Spatial dependency of soil nutrient availability and microbial properties in a mixed forest of Tsuga heterophylla and Pseudotsuga menziesii, in coastal British Columbia, Canada
- Bacterial immobilization and remineralization of N at different growth rates and N concentrations
- C-13 incorporation into signature fatty acids as an assay for carbon allocation in arbuscular mycorrhiza
- Relieving substrate limitation-soil moisture and temperature determine gross N transformation rates