Canada; carbon dioxide; climate change; greenhouse gas removal; nature-based solution; negative emissions technologies; NET; nitrous oxide; RothC; soil model; Emission technology; Gas removal; Greenhouse gas removal; Greenhouses gas; Nature-based solution; Negative emission technology; Nitrous oxide; Rothc; Soil model; Forestry; Renewable Energy, Sustainability and the Environment; Agronomy and Crop Science; Waste Management and Disposal
Abstract :
[en] To combat climate change, carbon dioxide must be prevented from entering the atmosphere or even removed from it. Biochar is one potential practice to sequester carbon, but its climate change mitigation potential depends on a multitude of parameters. Differentiating areas of low and high climate change mitigation through biochar addition is key to maximize its potential and effectively use the available feedstock for its production. This study models the realistic application of 1 metric tonne (t) per hectare (ha) of forest harvest residue derived biochar over the climatically and pedologically diverse agricultural area of British Columbia, Canada, and provides a framework and assumptions for reproducibility in other parts of the world. The model accounts for the direct (input of organic carbon) and indirect (enhanced plant biomass) effects of biochar on soil organic carbon stock, its impact on nitrous oxide emissions from soils, and the avoided emissions from the reduced lime requirement due to biochar's alkalinization potential. Impacts are modelled over 20-year time horizon to account for the duration and magnitude variation over time of biochar effect on plant biomass and nitrous oxide emissions from soil and conform to the IPCC GWP 20-year time horizon reporting. The results show that a single application of 1 t of biochar per ha−1 can mitigate between 3 and 5 t CO2e ha−1 over a 20-year time frame. Applied to the 746,000 ha of agricultural land of British Columbia this translate to the mitigation of a total of 2.5 million metric tonnes (Mt) CO2e over a 20-year time frame. Further, the results identify agricultural areas in the Lower Mainland region (the southwestern corner of British Columbia) as the area maximizing climate change mitigation potential through biochar addition due to a combination of relative high temperature, high precipitation, and crops with high nitrogen requirement.
Disciplines :
Environmental sciences & ecology
Author, co-author :
Lefebvre, David ; Faculty of Land and Food Systems, University of British Columbia, Vancouver, Canada
Cornelis, Jean-Thomas ; Université de Liège - ULiège > Département GxABT > Echanges Eau - Sol - Plantes ; Faculty of Land and Food Systems, University of British Columbia, Vancouver, Canada
Meersmans, Jeroen ; Université de Liège - ULiège > TERRA Research Centre > Echanges Eau - Sol - Plantes
Edgar, Jack; Faculty of Land and Food Systems, University of British Columbia, Vancouver, Canada
Hamilton, Morgan; Faculty of Land and Food Systems, University of British Columbia, Vancouver, Canada
Bi, Xiaotao; Department of Chemical and Biological Engineering, University of British Columbia, Vancouver, Canada
Language :
English
Title :
Environmental factors controlling biochar climate change mitigation potential in British Columbia's agricultural soils
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