Carbon sequestration mechanism by using charcoal (biochar) and compost in Farmland

For global warming prevention, sequestration mechanism of carbon in soil used with charcoal (biochar) was studied, and analysis method of charcoal carbon amount in the soil was established quantitatively

. By using charcoal carbonizedfrom biomass materials and food waste compost in the farmland, carbon sequestration for long period and increase of microorganisms in the soil are expected. Food waste compost was made in composting factory. FIGURE 1 shows flow chart of preparing food waste compost with charcoal in thefactory. Wood charcoal powder and compost made from food garbagewere used to the red-clayey soil farm land located in the suburbs ofTokyo.As aggregate of the soil can be developed with microorganisms in thesoil, adenosine tri-phosphate (ATP) concentration in the soil wasmeasured. The structure of the aggregate was estimated with the wetscreen method. The mean weight diameter (MWD) of the soil wascalculated with particle diameter (mm) and the integration number ofthe aggregate (%).As shown in FIGURE 2, the ATP concentration increased in the soilused with the charcoal and the compost, and about the half value ofwhich was observed in the soil with compost and without charcoal. There no change was observed in the soil without the addition.The MWD value of the soil was about 30 before the test. FIGURE 3 shows that after ten days using the charcoal and the compost, the MWD value increases to 58. In the soil with thecompost and without charcoal, the MWD increased to 48. It was found that the soil was aggregated withmicroorganisms in the soil. The aggregation of the soil in farmland was developed by using the charcoal and the compost. It was suggested that the soil was aggregated with microorganisms proliferated on the surface of the aggregate in the soil.



Copyright: © European Compost Network ECN e.V.
Quelle: Orbit 2012 (Juni 2012)
Seiten: 7
Preis inkl. MwSt.: € 7,00
Autor: Shuji Yoshizawa
Satoko Tanaka

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