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Biodegradation measurements confirm the predictive value of the O:C‐ratio for biochar recalcitrance |
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| Authors: | Mo Bai Burkhard Wilske Franz Buegger Esben Wilson Bruun Martin Bach Hans‐Georg Frede Lutz Breuer |
| Institution: | 1. Institute for Landscape Ecology and Resources Management (ILR), Research Centre for BioSystems, Land Use and Nutrition (IFZ), Justus Liebig University, Heinrich‐Buff‐Ring 26, 35392 Gie?en, Germany;2. Helmholtz Zentrum München, German Research Center for Environmental Health, Institute of Soil Ecology, Ingolst?dter Landstra?e 1, 85764 Neuherberg, Germany;3. Department of Chemical and Biochemical Engineering, Technical University of Denmark, Anker Engelunds Vej 1, 2800 Kgs. Lyngby, Denmark |
| Abstract: | Suitable predictors of degradability are sought to support the identification of biochars with large potential to increase C sequestration in soils. We determined the biodegradation of 9 chars from hydrothermal carbonization and pyrolysis in two agricultural soils. The 200‐ and 115‐day degradation correlated strongly with the O:C‐ and slightly with the H:C‐atomic ratio of 9 and 14 biochars, respectively. Highest temperature treatment and ash content did not show similar correlations. |
| Keywords: | biochar HTC biodegradability O:C atomic ratio 13CO2 efflux |