Potential of biochar to reduce greenhouse gas emissions and increase nitrogen use efficiency in boreal arable soils in the long-term

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Kalu , S , Kulmala , L , Zrim , J , Peltokangas , K , Tammeorg , P , Rasa , K , Kitzler , B , Pihlatie , M & Karhu , K 2022 , ' Potential of biochar to reduce greenhouse gas emissions and increase nitrogen use efficiency in boreal arable soils in the long-term ' , Frontiers in Environmental Science , vol. 10 , 914766 . https://doi.org/10.3389/fenvs.2022.914766

Title: Potential of biochar to reduce greenhouse gas emissions and increase nitrogen use efficiency in boreal arable soils in the long-term
Author: Kalu, Subin; Kulmala, Liisa; Zrim, Jure; Peltokangas, Kenneth; Tammeorg, Priit; Rasa, Kimmo; Kitzler, Barbara; Pihlatie, Mari; Karhu, Kristiina
Contributor organization: Department of Agricultural Sciences
Department of Forest Sciences
Soils and climate change
AgriChar research group
Plant Production Sciences
Environmental Soil Science
Viikki Plant Science Centre (ViPS)
Crop Science Research Group
Helsinki Institute of Sustainability Science (HELSUS)
Methane and nitrous oxide exchange of forests
Ecosystem processes (INAR Forest Sciences)
Institute for Atmospheric and Earth System Research (INAR)
Forest Soil Science and Biogeochemistry
Forest Ecology and Management
Date: 2022-05-17
Language: eng
Number of pages: 16
Belongs to series: Frontiers in Environmental Science
ISSN: 2296-665X
DOI: https://doi.org/10.3389/fenvs.2022.914766
URI: http://hdl.handle.net/10138/343743
Abstract: Biochars have potential to provide agricultural and environmental benefits such as increasing soil carbon sequestration, crop yield, and soil fertility while reducing greenhouse gas (GHG) emissions and nitrogen leaching. However, whether these effects will sustain for the long-term is still unknown. Moreover, these effects were observed mostly in highly weathered (sub-) tropical soils with low pH and soil organic carbon (SOC). The soils in northern colder boreal regions have typically higher SOC and undergo continuous freeze-thaw cycles. Therefore, effects of biochars in these regions may be different from those observed in other climates. However, only a few biochar studies have been conducted in boreal regions. We aimed to assess the long-term effects of biochars on GHG emissions, yield-normalized non-CO2 GHG emissions (GHGI), and N dynamics in boreal soils. For this, we collected data from four existing Finnish biochar field experiments during 2018 growing season. The experiments were Jokioinen (Stagnosol), Qvidja (Cambisol), Viikki-1 (Stagnosol), and Viikki-2 (Umbrisol), where biochars were applied, 2, 2, 8, and 7 years before, respectively. The GHG emissions, crop yield, soil mineral N, and microbial biomass were measured from all fields, whereas, additional measurements of plant N contents and N leaching were conducted in Qvidja. Biochars increased CO2 efflux in Qvidja and Viikki-2, whereas, there were no statistically significant effects of biochars on the fluxes of N2O or CH4, but in Qvidja, biochars tended to reduce N2O fluxes at the peak emission points. The tendency of biochars to reduce N2O emissions seemed higher in soils with higher silt content and lower initial soil carbon. We demonstrated the long-term effects of biochar on increased crop yield by 65% and reduced GHGI by 43% in Viikki-2. In Qvidja, the significant increment of plant biomass, plant N uptake, nitrogen use efficiency, and crop yield, and reduction of NO3--N leaching by the spruce biochar is attributed to its ability to retain NO3--N, which could be linked to its significantly higher specific surface area. The ability of the spruce biochar to retain soil NO3--N and hence to reduce N losses, has implications for sustainable management of N fertilization.
Subject: 1172 Environmental sciences
4111 Agronomy
greenhouse gas emissions
nitrous oxide
nitrogen leaching
nitrogen uptake
Peer reviewed: Yes
Rights: cc_by
Usage restriction: openAccess
Self-archived version: publishedVersion
Funder: Valtion perusrahoitus/hankkeet
Grant number:

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