Hagemann, N; Joseph, S; Schmidt, HP; Kammann, CI; Harter, J; Borch, T; Young, RB; Varga, K; Taherymoosavi, S; Elliott, KW; McKenna, A; Albu, M; Mayrhofer, C; Obst, M; Conte, P; Dieguez-Alonso, A; Orsetti, S; Subdiaga, E; Behrens, S; Kappler, A: Organic coating on biochar explains its nutrient retention and stimulation of soil fertility, Nature Communications, 8, 1089 1-11 (2017), online: 20.10.2017, doi:10.1038/s41467-017-01123-0 [Link]
Abstract:
Amending soil with biochar (pyrolized biomass) is suggested as a globally applicable approach to address climate change and soil degradation by carbon sequestration, reducing soil-borne greenhouse-gas emissions and increasing soil nutrient retention. Biochar was shown to promote plant growth, especially when combined with nutrient-rich organic matter, e.g., co-composted biochar. Plant growth promotion was explained by slow release of nutrients, although a mechanistic understanding of nutrient storage in biochar is missing. Here we identify a complex, nutrient-rich organic coating on co-composted biochar that covers the outer and inner (pore) surfaces of biochar particles using high-resolution spectro (micro)scopy and mass spectrometry. Fast field cycling nuclear magnetic resonance, elec- trochemical analysis and gas adsorption demonstrated that this coating adds hydrophilicity, redox-active moieties, and additional mesoporosity, which strengthens biochar- water interactions and thus enhances nutrient retention. This implies that the functioning of biochar in soil is determined by the formation of an organic coating, rather than biochar surface oxidation, as previously suggested.
Aktuelle Termine


Antrittsvorlesung:
Mi. 19.12.2018
Antrittsvorlesung von Juniorprofessorin Dr. Johanna Pausch (Agrarökologie)
BayCEER-Kolloquium:
Do. 13.12.2018
High resolution mass spectrometry in environmental sciences and beyond.
Do. 10.01.2019
From research to agro-environmental policy: success stories for biodiversity conservation
Do. 17.01.2019
Hot spots of C turnover in soil
Geographisches Kolloquium:
Mi. 12.12.2018
Die Mittelterrassen des Rheins und ihre Deckschichten – Genese, Stratigraphie und Chronologie
Wetter Versuchsflächen
Luftdruck (356m): 966.6 hPa
Lufttemperatur: 3.7 °C
Niederschlag: 0.0 mm/24h
Sonnenschein: <1 h/d
Wind (Höhe 17m): 17.5 km/h
Wind (Max.): 34.9 km/h
Windrichtung: W

...mehr
Globalstrahlung: 2 W/m²
Lufttemperatur: 0.8 °C
Niederschlag: 0.0 mm/24h
Sonnenschein: <1 h/d
Wind (Höhe 32m): 16.7 km/h
Wind (Max.): 36.0 km/h

...mehr
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