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Mats Öquist

Mats Öquist
I carry out research and teaching in the fields of soil science and environmental biogeochemistry, and am primarily interested in how microorganisms in the environment are involved in the cycling of carbon and nitrogen in forests and wetlands. A central part of this research is linked to the production and consumption of atmospheric greenhouse gases, with special emphasis on biogeochemical processes at low temperatures. The scale at which I address these issues range from the molecular level to whole ecosystems. I am also interested in how different forest management regimes, e.g. forest fertilization, influence the exchange of carbon and greenhouse gases between ecosystems and the atmosphere. I am Deputy Head of Department with a delegated responsibility for premises, work environment and safety. I am also the Director of the analytical infrastructure SLU Stable Isotope Laboratory (SSIL)

Selected publications

Peer reviewed publications


Campeau, A., Bishop, K., Klemedtsson, L., Laudon, H., Leith, F. I., Öquist, M. G. & Wallin, M. B. 2018. Stable carbon isotopes reveal soil-stream DIC linkages in contrasting headwater streams, Journal of Geophysical Research, (accepted).


Segura, J., Nilsson, M. B., Haei, M., Sparrman, T., Mikkola, J-P., Schleucher, J. & Öquist, M. G. 2017. Microbial mineralization of cellulose in frozen soils, Nature Communications, 8, art. No. 1154, doi:10.1038/s41467-017-01230-y.

Campeau, A., Bishop, K., Billett, M., Garnett, M., Laudon, H., Leach, J., Nilsson, M., Öquist, M. G. & Wallin, M. 2017. Aquatic export of young dissolved and gaseous carbon from a pristine boreal fen: implications for peat carbon stock stability. Global Change Biology, doi:10.1111/gcb.13815.

Soucemarianadin, L, Erhagen, B. Nilsson, M. Öquist M. G. & Schleucher, J. 2017. Two-dimensional NMR spectroscopy strongly enhances soil organic matter composition analysis, Organic Geochemistry, 113, 184-195.



Zhao, J., Peichl, M., Öquist, M. G. & Nilsson, M. 2016. Gross primary production controls winter CO2 exchange in a boreal peatland, Global Change Biology, doi:10.1111/gcb.133308.

Georg Jocher, G., Ottosson Löfvenius, M., De Simon, G., Hörnlund, T., Linder, S., Lundmark, T., Marshall, J., Nilsson, M. B., Näsholm, T., Tarvainen, L, Öquist, M. G., & Peichl, M. 2016. Apparent winter CO2 uptake by a boreal forest due to decoupling, Agricultural and Forest Meteorology, 232 23-34.

Winterdahl, M., Wallin, M., Heuseb Karlsen, R., Laudon, H., Öquist, M. G. & Lyon, S. 2016. De-coupling of carbon dioxide and dissolved organic carbon in boreal headwater streams, Journal of Geophysical Research-Biogeosciences, 121, doi:101002/2016JG003420.

Öquist, M. G., Erhagen, B., Haei, M., Sparrman, T., Ilstedt, U., Schleucher, J. & Nilsson, M.B. 2016. The effect of temperature and substrate quality on the carbon use efficiency of saprotrophic decomposition, Plant and Soil.


Leith, F. I., Dinsmore, K. J., Wallin, M. B., Billett, M. F., Heal, K. V., Laudon, H., Öquist, M. G. & Bishop, K. 2015. Carbon dioxide transport across the hillslope-riparian-stream continuum in a boreal headwater catchment. Biogeosciences, 12, 1881-1892, doi: 10.519/bg-12-1881-2015.


Peichl, M., Öquist, M. G., Ottosson-Löfvenius, M., Ilstedt, U., Sagerfors, J., Grelle, A., Lindroth, A., Nilsson, M. 2014. A 12-year record reveals pre-growing season temperature and water table level threshold effects on the net carbon dioxide uptake in a boreal fen. Environmental Research Letters, 9, doi:10.1088/1748-9326/9/055006.

Öquist, M. G., Bishop, K., Grelle, A., Klemedtsson, L., Kohler, S., Laudon, H., Lindroth, A., Ottosson-Löfvenius, M., Wallin, M. B. & Nilsson, M. N. 2014. The full annual carbon balance of boreal forests is highly sensitive to precipitation. Environmental Science & Technology Letters, 1, 315-319, doi:10.1021/ez500169j.4


Haei, M., Öquist, M. G., Kreyling, J. & Laudon, H. 2013. Winter climate controls soil carbon dynamics during summer in boreal forests. Environmental Research Letters, 8, doi:10.1088/1748-9326/8/2/024017

Erhagen, B., Öquist M. G., Sparrman, T., Haei, M., Ilstedt, U., Hedenstrom, M., Schleucher, J. & Nilsson, M. 2013 Temperature response of litter and soil organic matter decomposition is determined by chemical composition of organic material, Global Change Biology, 19, 3858-3871, doi:10.1111/gcb.12342.


Wallin, M., Grabs, T., Buffam, I., Laudon, H., Ågren, A., Öquist, M. & Bishop, K. 2012. Evasion of CO2 from streams - The dominant component of the carbon export through the aquatic conduit in a boreal landscape. Global Change Biology, doi: 10.1111/gcb.12083.


Brooks, P., Groffman, P., Grogan, P., Öquist, M. G., Schimel, J., Templer, P. H. 2011. Biogeochemistry of Seasonally snow covered soils, Geography Compass, 5/9, 682-699, doi: 10.1111/j.1749-8198.2011.00420.x.

Wallin, M., Öquist, M. G., Buffam, I., Billet, M. & Bishop, K. 2011. Spatiotemporal variability of the gas transfer coefficient (KCO2) in boreal streams; implications for large scale estimates of CO2 evasion. Global Biogeochemical Cycles, 25, GB3025, doi:10.1029/2010GB003975.

Haei, M., Rousk, J., Ilstedt, U., Öquist, M.G., Bååth, E. & Laudon, H.2011. Effects of soil frost on growth, composition and respiration of the soil microbial decomposer community. Soil Biology & Biochemistry, 43, 2069-2077. Doi: 10.1016/j_soilbio.2011.06.005.


Eriksson, T., Öquist, M. G. & Nilsson, M. 2010. Production and oxidation of methane in a boreal mire after a decade of increased temperature and nitrogen and sulfur deposition. Global Change Biology,16, 2130-2144, doi: 10.1111/j.1365-2486.2009.02097.x.

Wallin, M., Buffam, I., Öquist, M. G., Laudon, H. & Bishop, K. 2010. Temporal and spatial variability of dissolved inorganic carbon in a boreal stream network – concentrations and downstream fluxes. Journal of Geophysical Research, 115, G02014, doi:10.1029/2009JG001100.

Harrysson Drotz, S., Sparrman, T., Schleucher, J., Nilsson, M. & Öquist, M. G. 2010. Effects of soil organic matter composition on unfrozen water content and heterotrophic CO2 production of frozen soils, Geochimica et Cosmochimica Acta, 47, 2281-2290, doi: 10.1016/j.gca.2010.01.026.

Haei, M., Öquist, M. G., Buffam, I., Ågren, A., Blomkvist, P., Bishop, K., Ottosson-Lofenius, M. & Laudon, H. 2010. Cold winter soils enhance dissolved organic carbon in stream water, Geophysical Research Letters, 37, Art. No. L08501, doi: 10.1029/2010GL042821.

Tilston, E. L., Sparrman, T. & Öquist, M. G. 2010. Unfrozen water content moderates temperature dependence of sub-zero microbial respiration, Soil Biology & Biochemistry 42, 1396-1407, doi:10.1016/j.soilbio.2010.04.018.

Eriksson, T., Öquist, M. G. & Nilsson, M. 2010. Effects of decadal deposition of nitrogen and sulfur, and increased temperature, on methane emissions from a boreal peatland, Journal of Geophysical Research, 115, G04036, doi:10.1029/2010JG001285.

Haei, M., Öquist, M. G., Ilstedt, U. & Laudon, H. 2010.  The influence of soil frost on the quality of dissolved organic carbon in a boreal forest soil – combining field-scale and laboratory experiments. Biogeochemistry, Doi: 10.1007/s10533-010-9534-2.

Harrysson Drotz, S., Sparrman, T., Nilsson, M., Schleucher, J. & Öquist, M. G. 2010. Microbial activity in frozen boreal forest soils - Both catabolic and anabolic processes proceed under frozen conditions. Proceedings of the National Academy of Sciences of the United States of America, doi: 10.1073/pnas.1008885107.


Öquist, M. G. 2009. Contributions of matric and osmotic potentials to the unfrozen water content of frozen soils, Geoderma, 148, 392-398.

Öquist, M. G., Sparrman, T., Harryson Drotz, S., Klemedtsson, L., Grip, H., Schleucher, J. & Nilsson, M. 2009. Water availability controls microbial temperature response in frozen soil CO2 production, Global Change Biology, 15, 2715-2722, doi: 10.1111/j.1365-2486.2009.01898.x.

Öquist, M. G., Wallin, M., Seibert, J., Bishop, K., & Laudon, H. 2009. DIC export across the soil/stream interface and its fate in a boreal headwater stream. Environmental Science & Technology, 43, 7364-7369, doi: 10.1021/es900416h.

Maljanen, M., Virkajärvi,  P., Hytönen, J., Öquist, M. G., Sparrman, T. & Martikainen, P. J. 2009. Nitrous oxide production in boreal soils with variable organic matter content at low temperature – snow manipulation experiment, Biogeosciences, 6, 2461-2473.

Nilsson, M. & Öquist, M. G. 2009. Partitioning litter mass loss into carbon dioxide and methane in peatland ecosystems. In: Northern Peatlands and Carbon Cycling (Ed.  Baird A.J. et al.), Geophysical Monograph Series, 184, 131-144.



Researcher at the Department of Forest Ecology and Management; Department of Forest Ecology and Management, joint staff
Telephone: +46907868525, +46705540361
Postal address:
Skogens ekologi och skötsel
901 83 Umeå
Visiting address: Skogsmarksgränd 17, Umeå