The main goal of my current research is to improve our understanding on how rewetting affects the biogeochemistry and greenhouse gas dynamics of drained peatland forests in the boreal region of Sweden. I achieve this by eddy covariance measurements of the ecosystem-scale CO2 and CH4 exchanges combined with detailed estimates of spatial variability from plot-scale greenhouse gas flux (incl. CO2, CH4 and N2O) measurements using chambers. An important part of this research is collaboration with various governmental agencies and forest stakeholders to support the development of sustainable and climate-responsible forest management strategies.
In addition, I am interested in understanding how the individual component fluxes of the peatland C cycle (i.e. gross and net primary production, heterotrophic and autotrophic respiration as well as plant-mediated CH4 transport) respond to their biotic and abiotic drivers. More specifically, my work explores the relationship between vegetation development and the relative contribution of these component fluxes during distinct phenological phases. For this purpose, I use manual and automated chambers for quantifying CO2 and CH4 fluxes, monitor a suit of environmental variables and collect comprehensive vegetation data.
Nielsen CS, Hasselquist NJ, Nilsson MB, Öquist M, Järveoja J, Peichl M (2019) A novel approach for continuous in-situ quantification of methane oxidation in peatlands. Soil Systems 3(1), 4
Järveoja J, Nilsson MB, Gažovič M, Crill PM, Peichl M (2018) Partitioning of the net CO2 exchange using an automated chamber system reveals plant phenology as key control of production and respiration fluxes in a boreal peatland. Global Change Biology 24: 3436-3451, https://doi.org/10.1111/gcb.14292
Pärn J, Verhoeven JTA, Butterbach-Bahl K, Dise NB, Ullah S, Aasa A, Egorov S, Espenberg M, Järveoja J, Jauhiainen J, Kasak K, Klemedtsson L, Kull A … Mander Ü (2018) Nitrogen-rich organic soils under warm well-drained conditions are global nitrous oxide emission hotspots. Nature Communications, 9: 1135, https://doi.org/10.1038/s41467-018-03540-1
Espenberg M, Truu M, Truu J, Maddison M, Nõlvak H, Järveoja J, Mander Ü (2016) Impact of reed canary grass cultivation and mineral fertilisation on the microbial abundance and genetic potential for methane production in residual peat of an abandoned peat extraction area. PLoS ONE 11(9): e0163864, https://doi:10.1371/journal.pone.0163864
Järveoja J, Peichl M, Maddison M, Soosaar K, Vellak K, Karofeld E, Teemusk A, Mander Ü (2016) Impact of water table level on annual carbon and greenhouse gas balances of a restored peat extraction area. Biogeosciences, 13: 2637-2651, https://doi:10.5194/bg-13-2637-2016
Järveoja J, Peichl M, Maddison M, Teemusk A, Mander Ü (2016) Full carbon and greenhouse gas balances of fertilized and nonfertilized reed canary grass cultivations on an abandoned peat extraction area in a dry year. Global Change Biology Bioenergy, 8: 952–968, https://doi:10.1111/gcbb.12308
Kasak K, Mander Ü, Truu J, Truu M, Järveoja J, Maddison M, Teemusk A (2015) Alternative filter material removes phosphorus and mitigates greenhouse gas emission in horizontal subsurface flow filters for wastewater treatment. Ecological Engineering, 77: 242–249, https://doi:10.1016/j.ecoleng.2015.01.038
Leppelt T, Dechow R, Gebbert S, Freibauer A, Lohila A, Augustin J, Drösler M, Fiedler S, Glatzel S, Höper H, Järveoja J, Lærke PE, Maljanen M, Mander Ü, Mäkiranta P, Minkkinen K, Ojanen P, Regina K, Strömgren M (2014) Nitrous oxide emission budgets and land-use-driven hotspots for organic soils in Europe. Biogeosciences, 11: 6595–6612, https://doi:10.5194/bg-11-6595-2014
Järveoja J, Laht J, Maddison M, Soosaar K, Ostonen I, Mander Ü (2013) Mitigation of greenhouse gas emissions on an abandoned peat extraction area by growing reed canary grass: Life-cycle assessment. Regional Environmental Change, 13(4): 781–795, https://doi:10.1007/s10113-012-0355-9
Mander Ü, Järveoja J, Maddison M, Soosaar K, Aavola R, Ostonen I, Salm J-O (2012) Reed canary grass cultivation mitigates greenhouse gas emissions from abandoned peat extraction areas. Global Change Biology Bioenergy, 4: 462–474, https://doi:10.1111/j.1757-1707.2011.01138.x