A POSSIBLE SOURCE OF HUMIC ACIDS IN VOLCANIC ASH SOILS IN JAPAN—CHARRED RESIDUE OF Miscanthus sinensis

Alkali extraction of archaeological and geological charcoal: evidence for diagenetic degradation and formation of humic acids

“…These are similar to HA extracted from soils subjected to high temperatures (e.g. volcanic ash soils) (Kumada 1983;Kramer et al, 2004;Shindo et al, 1986). This indicates that some residues of biomass burning either initially conform to the definition of alkali-extractable HA, or become so after periods of deposition in mineral soil (c.f.…”

Solid state NMR studies of fire-induced changes in the structure of humic substances

“…These transformations conform to the concept that heat treatment at low temperatures may simula te several features of the humification process [28,11]. In sorne cases, charred lignocellulosic materials have been considered as a possible source of soil humus [29,30].…”

Black (pyrogenic) carbon: a synthesis of current knowledge and uncertainties with special consideration of boreal regions

“…The isolation of highly aromatic humic acids from SOM has long been considered an indicator of BC inputs (Haumaier and Zech, 1995;Golchin et al, 1997;Zech et al, 1997;Almendros et al, 2003;Benites et al, 2005), as is development of stable humus forms highly resistant to decomposition (Almendros et al, 2003;Benites et al, 2005). Highly aromatic humic acids (Shindo et al, 1986;Hiradate et al, 2004) and charred plant fragments constituting 3-33% of SOC (Shindo et al, , 2005 were found in volcanic ash soils from Japanese grasslands subject to frequent burning.…”