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Report No.
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Production of charred plants and subsequent their distribution, behavior and function in soils

Yanagi, Yukiko*; Shindo, Haruo*; Nishimura, Shusaku

Biochar, consisting of charred biomass products involving plants, is a stable form of C. The findings obtained in our studies, in which the production and the distribution, behavior, and function of charred plant fragments (CPFs) in soils have been investigated, may get a better understanding of the role of biochar. (1) The dehydrative polycondensation reactions occurred during the burning. (2) The CPFs were hardly mineralized by soil microorganisms. (3) The silt-sized fraction was an important reservoir of CPFs. (4) The CPFs are subjected to weathering and biological degradation in soil after burning, and are transformed to black humic acids. (5) In conclusion, after burning, the CPFs produce the black humic acids with the progression of abiotic and biotic degradation in soils. The parts of these CPFs are more stabilized by forming the complexes with inorganic components in the silt-sized fraction. Thus, their complexes are preserved in the fraction for a long period of time.

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