Soil respiration and soil organic matter pools in soils amended for 7 years with biochar combined with mineral and organic fertilizers
- 1Instituto de Ciencias Agrarias, Consejo Superior de Investigaciones Científicas, Madrid, Spain (i.benavente@ica.csic.es)
- 2IFSTTAR, GERS, EE, Bouguenais, France
- 3Museo Nacional de Ciencias Naturales, Consejo Superior de Investigaciones Científicas, Madrid, Spain
- 4Dpt. of Biotechnology, University of Verona, Italy
- 5Dpt. de Química Agrícola y Bromatología, Facultad de Ciencias, Universidad Autónoma de Madrid, Madrid, Spain
- 6Dpt. de Producción Agraria, ETSI Agrónomos, Universidad Politécnica de Madrid, Spain
- 7Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria, Madrid, Spain
Biochar application is now considered to be one of the most promising agricultural practices to mitigate climate change. However, to fully assess the benefits of biochar, we still need to better understand its effects on soil properties, and particularly on native soil organic matter (SOM) dynamics.
In this work, we investigated soil respiration and changes in SOM pools (mineral-free, intra-aggregate, and mineral-associated SOM) as affected by the application of 20 t / ha per year of biochar alone or combined with mineral fertilizer, municipal solid waste compost, or sewage sludge. The experiment was run for 7 years in a semiarid agricultural soil. We found that biochar had no effect on soil respiration with respect to mineral fertilization and no amendment (control), and tended to decrease CO2 emissions from soils amended with municipal solid waste compost and sewage sludge. Biochar accumulated mainly in the mineral-free SOM fraction and its addition, especially in combination with municipal solid waste compost, promoted the amount of SOM occluded with aggregates and associated to mineral surfaces.
Acknowledgments: to the Spanish MICINN (MINECO, AEI, FEDER, EU) for supporting the research project AGL2016-75762-R.
How to cite: Benavente-Ferraces, I., Esteban, F., Courtier-Murias, D., Rey, A., Zaccone, C., Moreno-Jiménez, E., Gascó, G., Panettieri, M., Delgado, M. M., García-Gil, J. C., and Plaza, C.: Soil respiration and soil organic matter pools in soils amended for 7 years with biochar combined with mineral and organic fertilizers, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-21181, https://doi.org/10.5194/egusphere-egu2020-21181, 2020
