Kristiina Karhu

Academy Research Fellow, Department of Forest Sciences
Assistant Professor, Department of Forest Sciences
Group Leader, Soils and climate change
Forest Soil Science and Biogeochemistry
Forest Ecology and Management
Supervisor for doctoral programme, Doctoral Programme in Interdisciplinary Environmental Sciences
Supervisor for doctoral programme, Doctoral Programme in Sustainable Use of Renewable Natural Resources

Phone+358504486149, +358294158160
Emailkristiina.karhu@helsinki.fi

PL 27 (Latokartanonkaari 7)
00014
Finland
Viikinkaari 1, Biocentre 3
00790 Helsinki
Finland
Viikinkaari 1, Biokeskus 3
00790 Helsinki
Finland

Research activity per year

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25 Article
2 Abstract
2 Poster
1 Book

30 results

2021

Effects of two wood-based biochars on the fate of added fertilizer nitrogen—a ¹⁵N tracing study
Kalu, S., Oyekoya, G. N., Ambus, P., Tammeorg, P., Simojoki, A., Pihlatie, M. & Karhu, K., 28 Jan 2021, In : Biology and Fertility of Soils. 57, p. 457-470 14 p.
Research output: Contribution to journal › Article › Scientific › peer-review

Open Access
File
Long-term effects of softwood biochar on soil physical properties, greenhouse gas emissions and crop nutrient uptake in two contrasting boreal soils
Kalu, S., Simojoki, A., Karhu, K. & Tammeorg, P., 21 Aug 2021, In : Agriculture, Ecosystems & Environment. 316, 15 p., 107454.
Research output: Contribution to journal › Article › Scientific › peer-review

Open Access
File
Potential of biochar soil amendments to reduce N leaching in boreal field conditions estimated using the resin bag method
Karhu, K., Kalu, S., Seppänen, A., Kitzler, B. & Virtanen, E., 3 May 2021, In : Agriculture, Ecosystems & Environment. 316, p. 1-10 10 p., 107452.
Research output: Contribution to journal › Article › Scientific › peer-review

Open Access
File
2020

Hiiliopas: Katsaus maaperän hiileen ja hiiliviljelyn perusteisiin
Heinonsalo, J. (ed.), Heimsch, L., Helenius, J., Huusko, M. K., Höijer, L., Joona, J. M., Kanerva, S., Karhu, K., Kekkonen, H. R., Koppelmäki, K., Kulmala, L., Lötjönen, S., Mattila, T. J., Ollikainen, M., Peltokangas, K., Regina, K., Soinne, H., Wikström, U. & Viskari, T., Jan 2020, 1 ed. Kaarina: Carbon Action & Baltic Sea Action Group. 60 p.
Research output: Book/Report › Book › Professional

Open Access
File
Insect herbivory dampens Subarctic birch forest C sink response to warming
Silfver, T., Heiskanen, L., Aurela, M., Myller, K., Karhu, K., Meyer, N., Tuovinen, J-P., Oksanen, E., Rousi, M. & Mikola, J., 21 May 2020, In : Nature Communications. 11, 1, 9 p., 2529.
Research output: Contribution to journal › Article › Scientific › peer-review

Open Access
File
2019

Carbon and nitrogen release in decomposition of boreal organic soils – Temperature sensitivity patterns.
Laurén, A., Lappalainen, M., Kieloaho, A-J., Karhu, K. & Palviainen, M., 2019. 1 p.
Research output: Conference materials › Abstract › peer-review
Forest fires in Canadian permafrost region: the combined effects of fire and permafrost dynamics on soil organic matter quality
Aaltonen, H., Koster, K., Koster, E., Berninger, F., Zhou, X., Karhu, K., Biasi, C., Bruckman, V., Palviainen, M. & Pumpanen, J., Mar 2019, In : Biogeochemistry. 143, 2, p. 257-274 18 p.
Research output: Contribution to journal › Article › Scientific › peer-review

Open Access
File
How do softwood biochars affect the microbial communities and greenhouse gas emissions from agricultural soils in southern Finland? Miten havupuupohjaiset biohiilet vaikuttavatmaanpieneliöyhteisöihin ja kasvihuonekaasupäästöihin biohiilikokeissa Etelä-Suomessa?
Zrim, J., Simojoki, A. J., Penttinen, P. J., Karhu, L. K. & Tammeorg, P., 9 Jan 2019, p. 107-108.
Research output: Conference materials › Poster

Open Access
Short-term effects of two wood-based biochars on nitrogen leaching and nitrous oxide emissions
Kalu, S., Oyekoya, G. N., Ambus, P., Tammeorg, P. & Karhu, K., 2019.
Research output: Conference materials › Abstract
Similar temperature sensitivity of soil mineral-associated organic carbon regardless of age
Karhu, K., Hilasvuori, E., Jarvenpaa, M., Arppe, L., Christensen, B. T., Fritze, H., Kulmala, L., Oinonen, M., Pitkanen, J-M., Vanhala, P., Heinonsalo, J. & Liski, J., Sep 2019, In : Soil Biology & Biochemistry. 136, 9 p., 107527.
Research output: Contribution to journal › Article › Scientific › peer-review

Open Access
File
Temperature sensitivity patterns of carbon and nitrogen processes in decomposition of boreal organic soils – Quantification in different compounds and molecule sizes based on a multifactorial experiment
Laurén, A., Lappalainen, M., Kieloaho, A-J., Karhu, K. & Palviainen, M., 10 Oct 2019, In : PLoS One. 14, 10, 24 p., e0223446.
Research output: Contribution to journal › Article › Scientific › peer-review

Open Access
File
2018

Effects of softwood biochars on soil biota in medium-term field experiments in Finland
Zrim, J., Nuutinen, V., Simojoki, A. J., Penttinen, P. J., Karhu, L. K., Glaser, B. & Tammeorg, P., 17 Jun 2018, p. 209. 223 p.
Research output: Conference materials › Poster

Open Access
File
Postfire nitrogen balance of Mediterranean shrublands: Direct combustion losses versus gaseous and leaching losses from the postfire soil mineral nitrogen flush
Dannenmann, M., Diaz-Pines, E., Kitzler, B., Karhu, K., Tejedor, J., Ambus, P., Parra, A., Sanchez-Martin, L., Resco, V., Ramirez, D. A., Povoas-Guimaraes, L., Willibald, G., Gasche, R., Zechmeister-Boltenstern, S., Kraus, D., Castaldi, S., Vallejo, A., Rubio, A., Moreno, J. M. & Butterbach-Bahl, K., Oct 2018, In : Global Change Biology. 24, 10, p. 4505-4520 16 p.
Research output: Contribution to journal › Article › Scientific › peer-review
2016

Priming effect increases with depth in a boreal forest soil
Karhu, K., Hilasvuori, E., Fritze, H., Biasi, C., Nykänen, H., Liski, J., Vanhala, P., Heinonsalo, J. & Pumpanen, J., Aug 2016, In : Soil Biology & Biochemistry. 99, p. 104-107 4 p.
Research output: Contribution to journal › Article › Scientific › peer-review
The Role of Microbial Community Composition in Controlling Soil Respiration Responses to Temperature
Auffret, M. D., Karhu, K., Khachane, A., Dungait, J. A. J., Fraser, F., Hopkins, D. W., Wookey, P. A., Singh, B. K., Freitag, T. E., Hartley, I. P. & Prosser, J. I., 31 Oct 2016, In : PLoS One. 11, 10, 19 p., 0165448.
Research output: Contribution to journal › Article › Scientific › peer-review

Open Access
File
2015

Fire increases the risk of higher soil N2O emissions from Mediterranean Macchia ecosystems
Karhu, K., Dannenmann, M., Kitzler, B., Diaz-Pines, E., Tejedor, J., Ramirez, D. A., Parra, A., Resco de Dios, V., Moreno, J. M., Rubio, A., Guimaraes-Povoas, L., Zechmeister-Boitenstern, S., Butterbach-Bahl, K. & Ambus, P., 2015, In : Soil Biology & Biochemistry. 82, p. 44-51 8 p.
Research output: Contribution to journal › Article › Scientific › peer-review
2014

Temperature sensitivity of soil respiration rates enhanced by microbial community response
Karhu, K., Auffret, M. D., Dungait, J. A. J., Hopkins, D. W., Prosser, J. I., Singh, B. K., Subke, J-A., Wookey, P. A., Agren, G. I., Sebastia, M-T., Gouriveau, F., Bergkvist, G., Meir, P., Nottingham, A. T., Salinas, N. & Hartley, I. P., 2014, In : Nature. 513, 7516, p. 81-84 4 p.
Research output: Contribution to journal › Article › Scientific › peer-review
2013

Temperature sensitivity of decomposition in a peat profile
Hilasvuori, E., Akujärvi, A., Fritze, H., Karhu, K., Laiho, R., Mäkiranta, P., Oinonen, M., Palonen, V., Vanhala, P. & Liski, J., 2013, In : Soil Biology & Biochemistry. 67, p. 47-54 8 p.
Research output: Contribution to journal › Article › Scientific › peer-review
2012

Impacts of organic amendments on carbon stocks of an agricultural soil - Comparison of model-simulations to measurements
Karhu, K., Gardenas, A. I., Heikkinen, J., Vanhala, P., Tuomi, M. & Liski, J., 2012, In : Geoderma. 189, p. 606-616 11 p.
Research output: Contribution to journal › Article › Scientific › peer-review
2011

Biochar addition to agricultural soil increased CH4 uptake and water holding capacity - Results from a short-term pilot field study
Karhu, K., Mattila, T., Bergstrom, I. & Regina, K., 30 Jan 2011, In : Agriculture, Ecosystems & Environment. 140, 1-2, p. 309-313 5 p.
Research output: Contribution to journal › Article › Scientific › peer-review
Effects of afforestation and deforestation on boreal soil carbon stocks-Comparison of measured C stocks with Yasso07 model results
Karhu, K., Wall, A., Vanhala, P., Liski, J., Esala, M. & Regina, K., 15 Aug 2011, In : Geoderma. 164, 1-2, p. 33-45 13 p.
Research output: Contribution to journal › Article › Scientific › peer-review
Transplantation of organic surface horizons of boreal soils into warmer regions alters microbiology but not the temperature sensitivity of decomposition.
Hyvärinen, H., Vanhala, P., Karhu, K., Tuomi, M., Björklöf, K., Fritze, H. & Liski, J., Jan 2011, In : Global Change Biology. 17, p. 538-550
Research output: Contribution to journal › Article › Scientific › peer-review
2010

Molecular sieve sampling of CO2 from decomposition of soil organic matter for AMS radiocarbon measurements
Hämäläinen, K., Fritze, H., Jungner, H., Karhu, K., Oinonen, M., Sonninen, E., Spetz, P., Tuomi, MI., Vanhala, P. & Liski, J., 2010, In : Nuclear Instruments & Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms. 268, 7-8, p. 1067-1069 3 p.
Research output: Contribution to journal › Article › Scientific › peer-review
Temperature sensitivity of organic matter decomposition in two boreal forest soil profiles
Karhu, K., Fritze, H., Tuomi, M., Vanhala, P., Spetz, P., Kitunen, V. & Liski, J., Jan 2010, In : Soil Biology & Biochemistry. 42, 1, p. 72-82 11 p.
Research output: Contribution to journal › Article › Scientific › peer-review
Temperature sensitivity of soil carbon fractions in boreal forest soil
Karhu, K., Fritze, H., Hämäläinen, K., Vanhala, P., Jungner, H., Oinonen, M., Sonninen, E., Tuomi, M., Spetz, P., Kitunen, V. & Liski, J., 2010, In : Ecology. 91, p. 370-376 7 p.
Research output: Contribution to journal › Article › Scientific › peer-review

Open Access
2008

Heterotrophic soil respiration - Comparison of different models describing its temperature dependence
Tuomi, M., Karhu, K., Vanhala, P., Fritze, H. & Liski, J., 24 Feb 2008, In : Ecological Modelling. 211, 1-2, p. 182-190 9 p.
Research output: Contribution to journal › Article › Scientific › peer-review
Temperature sensitivity of soil organic matter decomposition in southern and northern areas of the boreal forest zone
Vanhala, P., Karhu, K., Tuomi, M., Bjorklof, K., Fritze, H. & Liski, J., Jul 2008, In : Soil Biology & Biochemistry. 40, 7, p. 1758-1764 7 p.
Research output: Contribution to journal › Article › Scientific › peer-review
Temperature sensitivity of young and old soil carbon - Same soil, slight differences in C-13 natural abundance method, inconsistent results
Conen, F., Karhu, K., Leifeld, J., Seth, B., Vanhala, P., Liski, J. & Alewell, C., Oct 2008, In : Soil Biology & Biochemistry. 40, 10, p. 2703-2705 3 p.
Research output: Contribution to journal › Article › Scientific › peer-review
2007

Old soil carbon is more temperature sensitive than the young in an agricultural field
Vanhala, P., Tuomi, M., Sonninen, E., Jungner, H., Fritze, H., Liski, J. & Karhu, K., 2007, In : Soil Biology & Biochemistry. 39, 11, p. 2967-2970 4 p.
Research output: Contribution to journal › Article › Scientific › peer-review
2005

Mesocosms mimic natural meadows as regards greenhouse gas fluxes and potential activities of nitrifying and denitrifying bacteria
Kanerva, T., Regina, K., Rämö, K., Ojanperä, K., Manninen, S. & Karhu, K., 2005, In : Plant and Soil. 276, 1/2, p. 287-299 13 p.
Research output: Contribution to journal › Article › Scientific › peer-review

Search results