Article (Scientific journals)
Young and century-old biochars strongly affect nutrient cycling in a temperate agroecosystem
Burgeon, Victor; Fouché, Julien; Garré, Sarah et al.
2022In Agriculture, Ecosystems and Environment, 328, p. 107847
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Keywords :
Charcoal kiln sites; Cropland; Nutrient leaching; Pyrogenic carbon; Soil pore water; Suction cups; Ecology; Animal Science and Zoology; Agronomy and Crop Science
Abstract :
[en] Biochar as a soil amendment is often described as a promising agricultural practice for climate change mitigation and adaptation. However, while recent research showed limited effects of biochar in temperate regions, its long-term impacts on nutrient management in-situ have been overlooked. Here we studied charcoal residues from pre-industrial kiln sites as a proxy to determine the effects of century-old biochar (~200 years old) on nutrient cycles of 3 land covers in a conventionally cropped field. We compared nutrient cycles of soil containing either century-old biochar (CoBC), recently pyrolyzed biochar (YBC) produced from similar feedstock (oak) and amended in similar amounts and a reference charcoal free soil (REF). For these three modalities, we characterized soil chemical properties, the pore water nutrient concentration evolution with time and depth using suction cups, and the crop nutrient uptakes. Our results revealed soil pore water nutrient concentrations strongly depended on biochar age. Indeed, YBC resulted in lower N-NO3- and K+ leaching but higher P-PO4– pore water concentrations in the topsoil Ap (0–30 cm) horizon. In CoBC higher K+ and Mg2+ concentrations occurred in the pore water than in REF for subsoil horizon E (30–60 cm) and Bt (60–100 cm). Beyond soil pore water, CoBC also strongly increased soil total N, available K+ and Ca2+ but decreased available P contents compared to REF and YBC. Finally, although no change in crop productivity occurred, lower N, K, Ca and higher Mg plant uptakes were observed for modalities with biochar. This resulted in no difference in terms of nutrient exports from the field in chicory but it significantly decreased N, K, Ca exports from biochar rich soil under winter wheat in straw. This study delivers the first field-based evidence that the effects of hardwood biochar on nutrient cycles change over its lifetime in a temperate Luvisol soil, whereby young biochar impacts mainly pore water nutrient concentrations and aged biochar mainly plant available contents. In such a strongly managed environment, no differences are noted in productivity despite strong changes in the nutrient cycle. Our study provides insights for addressing long-term effects of biochar in cultivated lands not only in terms of agronomic perspectives but through a biogeochemistry lens.
Disciplines :
Agriculture & agronomy
Author, co-author :
Burgeon, Victor ;  Université de Liège - ULiège > Université de Liège - ULiège
Fouché, Julien;  LISAH, Univ Montpellier, INRAE, IRD, Institut Agro, Montpellier, France
Garré, Sarah;  TERRA Teaching and Research Centre, Gembloux Agro-Bio Tech, University of Liège, Gembloux, Belgium ; Flanders Research Center for Agriculture, Fisheries and Food (ILVO), Merelbeke, Belgium
Dehkordi, Ramin Heidarian;  TERRA Teaching and Research Centre, Gembloux Agro-Bio Tech, University of Liège, Gembloux, Belgium
Colinet, Gilles  ;  Université de Liège - ULiège > TERRA Research Centre > Echanges Eau - Sol - Plantes
Cornelis, Jean-Thomas ;  Université de Liège - ULiège > Département GxABT > Echanges Eau - Sol - Plantes ; Faculty of Land and Food Systems, The University of British Columbia, Vancouver, Canada
Language :
English
Title :
Young and century-old biochars strongly affect nutrient cycling in a temperate agroecosystem
Publication date :
15 April 2022
Journal title :
Agriculture, Ecosystems and Environment
ISSN :
0167-8809
eISSN :
1873-2305
Publisher :
Elsevier B.V.
Volume :
328
Pages :
107847
Peer reviewed :
Peer Reviewed verified by ORBi
Funding text :
We would like to thank colleagues from the water-soil-plant exchange lab for their advice during the set-up of the field work and in particular Aurore Houtart for her help with field and lab work. A special thanks goes to Alexandre Godfrind owner and farmer of the experimental site for his help in the field. Thanks to Carolina Levicek, Audrey Peten and Gauthier Malnoury for the site representation. Many thanks also to the numerous contributors whom helped us install the numerous Sentek probes, the weather station, the suctions cups and much more as well as those who helped us harvest and hand plough our site, those were the days… This research was funded through the Concerted Research Action grant 17/21-03 within the CHAR project framework by the French Community of Belgium .
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