- Competence Areas
- Current Research
|Marie-Charlotte Nilsson Hegethorn|
My research focuses on the impacts of the Boreal forest understory (eg. ericaceous dwarf shrubs, feather mosses and reindeer lichens) on tree seedlings, resource competition, humus quality, nitrogen dynamics and litter decomposition. Of particular interest has been the role of poly-phenols produced by ericaceous dwarf-shrubs in controlling these processes. More recently, I have studied the role of nitrogen-fixing bacteria living on feathermosses for nitrogen build-up after forest fires. My research also involves questions that aim at answering the impact of charcoal produced after forest fires on key ecological processes that drive forest regeneration and forest composition.
The main aim of my research is to increase our fundamental knowledge of key processes governing the regeneration of natural and managed Boreal forests, and the sort of knowledge necessary for developing sustainable use of forest resources.
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Professor of Forest Regeneration (since December 2007)
Professor of Forest Vegetation Ecology (2001-2007)
Current research interests:
The role of understory on ecosystem processes - overview articles:Nilsson M-C and Wardle DA. 2005. Understory vegetation as a forest ecosystem driver: evidence from the northern Swedish boreal forest. Frontiers in Ecology and the Environment 3: 421-428.
Wardle DA, Nilsson M-C, Gallet C, and Zackrisson O. 1998. An ecosystem-level perspective of allelopathy. Biological Reviews of the Cambridge Philosophical Society 73: 305-319.
How forest fires and charcoal influence ecosystem processes:
DeLuca TH, Nilsson M-C, and Zackrisson O. 2002. Nitrogen mineralization and phenol accumulation along a fire chronosequence in northern Sweden. Oecologia 133: 206-214.
Wardle DA, Zackrisson O, and Nilsson M-C. 1998. The charcoal effect in Boreal forests: mechanisms and ecological consequences. Oecologia 115: 419-426.
Zackrisson O, Nilsson M-C, and Wardle DA. 1996. Key ecological function of charcoal from wildfire in the Boreal forest. Oikos 77: 10-19.
Nilsson M-C. 1994. Separation of allelopathy and resource competition by the Boreal dwarf shrub Empetrum hermaphroditumOecologia Hagerup. 98: 1-7.
The role of biological N fixation of feather mosses:
Gundale MJ, Wardle DA and Nilsson M-C. 2010 Vascular plant removal effects on biological N-fixation vary across a boreal forest island gradient. Ecology (in press).
Gundale MJ, Gustafsson H and Nilsson M-C 2009 The sensitivity of N-fixation by a cyanobacteria-feathermoss association to litter and moisture variability in young and old boreal forests. Canadian Journal of Forest Research 39:2542-2549.
DeLuca TH, Zackrisson O, Gundale M and M-C Nilsson. 2008. Ecosystem feedbacks and nitrogen fixation in boreal forests Science 320: 1181-1181.
Lagerström, A, Nilsson M-C, Zackrisson O et al. 2007. Ecosystem input of nitrogen through biological fixation in feather mosses during ecosystem retrogression. Functional Ecology 21: 1027-1033.
DeLuca TH, Zackrisson O, Gentili F, et al. 2007. Ecosystem controls on nitrogen fixation in Boreal feather moss communities. Oecologia 152: 121-130.
Zackrisson O, DeLuca TH, Nilsson M-C, et al. 2004. Nitrogen-fixation increases with successional age in boreal forests. Ecology 85: 3327-3334.
DeLuca TH, Zackrisson O, Nilsson M-C et al. 2002. Quantifying nitrogen-fixation in feather moss carpets of boreal forests. Nature 419: 917-920.
The role of ecological stresses on aboveground and belowground subalpine communities:
Nilsson M-C, Wardle DA, Zackrisson O, and Jäderlund A. 2002. Effects of alleviation of ecological stresses on an alpine tundra community over an eight year period. Oikos 97: 3-17.
The role of secondary metabolites produced by dwarf shrubs (eg. Empetrum hermaphroditum) for ecosystem processes:
Wallstedt A, Sommarin M, Nilsson M-C, et al. 2001. The inhibition of ammonium uptake in excised birch (Betula pendula) roots by Batatasin-III. Physiologia Plantarum 113: 368-376.
Wallstedt A, Nilsson M-C, Zackrisson O, and Odham G. 2000. A link in the study of chemical interference exerted by Empetrum hermaphroditum: Quantification of batatasin-III in soil solution. Journal of Chemical Ecology 26: 1311-1323.
Nilsson M-C, Zackrisson O, Sterner O, and Wallstedt A. 2000. Characterisation of the differential interference effects of two boreal dwarf shrub species. Oecologia 123: 122-128.
Gallet C, Nilsson M-C, and Zackrisson O. 1999. Phenolic metabolites of ecological significance in Empetrum hermaphroditum leaves and associated humus. Plant and Soil 210: 1-9.
Nilsson M-C, Gallet C, and Wallstedt A. 1998. Temporal variability of phenolics and batatasin-III in Empetrum hermaphroditum leaves over an eight-year period: interpretations of ecological function. Oikos 81: 6-16.
Nilsson M-C. 1994. Separation of allelopathy and resource competition by the Boreal dwarf shrub Empetrum hermaphroditum Oecologia Hagerup. 98: 1-7.
Nilsson M-C, Högberg P, Zackrisson O, and Wang FY. 1993. Allelopathic effects by Empetrum hermaphroditum on development and nitrogen uptake by roots and mycorrhizae of Pinus silvestris. Canadian Journal of Botany 71: 620-628.
Odén PC, Brandtberg PO, Andersson R, et al. 1992. Isolation and characterization of a germination inhibitor from leaves of Empetrum hemaphroditum Hagerup. Scandinavian Journal of Forest Research 7: 497-502.
Zackrisson O and Nilsson M-C. 1992. Allelopathic effects by Empetrum hermaphroditum on seed-germination of 2 Boreal tree species. Canadian Journal of Forest Research 22: 1310-1319.
Nilsson M-C and Zackrisson O. 1992. Inhibition of Scots pine seedling establishment by Empetrum hermaphroditum. Journal of Chemical Ecology 18: 1857-1870.
Biodiversity and ecosystem functioning in Boreal forests:
Nilsson M-C, Wardle DA, and DeLuca TH. 2007. Belowground and above ground consequences of interactions between live plant species mixtures and dead organic substrate mixtures. Oikos 117: 439-449
Dehlin H, Nilsson M-C, and Wardle DA. 2006. Aboveground and belowground responses to quality and heterogeneity of organic inputs to the boreal forest. Oecologia 150: 108-118.
Jonsson LM, Nilsson M-C, Wardle DA, and Zackrisson O. 2001. Context dependent effects of ectomycorrhizal species richness on tree seedling productivity. Oikos 93: 353-364.
Nilsson M-C, Wardle DA, and Dahlberg A. 1999. Effects of plant litter species composition and diversity on the boreal forest plant-soil system. Oikos 86: 16-26.
Forest stand dynamics in non-pyrogenic Boreal forests:
Steijlen I, Nilsson M-C, and Zackrisson O. 1995. Seed regeneration of Scots pine in Boreal forest stands dominated by lichen and feather moss. Canadian Journal of Forest Research 25: 713-723.
Zackrisson O, Nilsson M-C, Steijlen I, and Hörnberg G. 1995. Regeneration pulses and climate vegetation interactions in nonpyrogenic Boreal Scots pine stands. Journal of Ecology 83: 469-483.
Norberg G, Dolling A, Jäderlund A, et al. 2001. Control of heather (Calluna vulgaris (L.) Hull) by steam treatment: Effects on establishment and early growth of Scots pine. New Forests 21: 187-198.
Jäderlund A, Norberg G, Zackrisson O, et al. 1998. Control of bilberry vegetation by steam treatment - effects on seeded Scots pine and associated mycorrhizal fungi. Forest Ecology and Management 108: 275-285.
Norberg G, Jaderlund A, Zackrisson O, et al. 1997. Vegetation control by steam treatment in boreal forests: a comparison with burning and soil scarification. Canadian Journal of Forest Research 27: 2026-2033.
Nilsson M-C, Steijlen I, and Zackrisson O. 1996. Time-restricted seed regeneration of Scots pine in sites dominated by feather moss after clear-cutting. Canadian Journal of Forest Research 26: 945-953.
Supervision of MSc-students:
Post-doctoral researchers that have worked in my group: