Mitigation of Greenhouse Gas Emissions with Biochar Application in Compacted and Uncompacted Soil

Agronomy

Vladimír Šimanský¹  Tereza Hnátková²  Lukáš Trakal²  Ján Horák³  Tatijana Kotuš³  Martin Lukac⁴ 

[1] Department of Soil Science, Faculty of Agrobiology and Food Resources, Institute of Agronomic Sciences, Slovak University of Agriculture, 949 76 Nitra, Slovakia;Faculty of Environmental Sciences, Czech University of Life Sciences Prague, Kamýcká 129, 165 21 Prague, Czech Republic;Faculty of Horticulture and Landscape Engineering, Institute of Landscape Engineering, Slovak University of Agriculture, 949 76 Nitra, Slovakia;School of Agriculture, Policy and Development, University of Reading, Reading RG1 1AF, UK;

关键词: N₂O emissions;    CO₂ emissions;    biochar;    soil compaction;   

DOI  :  10.3390/agronomy12030546

来源: DOAJ

【 摘 要 】

Biochar may offer a substantial potential as a climate change mitigation and soil improvement agent; however, little is known about its effects in fertile soils subjected to standard agricultural practices. The aim of this short-term (60 days) lab experiment, under controlled temperature and soil moisture regimes, was to investigate the interaction between soil compaction and fertiliser and biochar addition in relatively fertile Luvisol. Three different biochar types and two soil compaction levels were investigated to describe their interactive effect on soil greenhouse gas emission (GHG). A very strong effect of soil compaction on N₂O emission (+280%) and an interaction with biochar were found. The cumulative N₂O emissions from the compacted soil were higher (from +70 to +371%, depending on the biochar type) than the uncompacted soil. Soil compaction resulted in a faster onset and a faster decrease of N₂O production. Biochar did not affect the temporal dynamics of N₂O evolution from either soil. The addition of digestate/crop biomass biochar has resulted in a significant increase in CO₂ evolution both in compacted and uncompacted soils, compared to softwood from spruce (mixture of branches and wood chips) and wood pallets from softwood (spruce without bark) biochar. In the compacted soil, NH₄⁺ availability was positively related to N₂O efflux, and CO₂ emission was positively correlated to both NH₄⁺ and SOC content. An increase in GHGs as a result of an increase in NH₄⁺ availability was seen both in compacted and uncompacted soils, while the rates of N₂O emission were modified by biochar type. Our results show a strong interaction between biochar and soil conditions and a strong effect of biochar type on GHG emissions from agricultural soils.

【 授权许可】

Unknown