^<14>C ages and δ^<13>C of sclerotium grains found in forest soils(Soil Chemistry and Soil Mineralogy)

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^<14>C ages and δ^<13>C were examined for sclerotium grains to elucidate the characteristics of these grains distributed in forest soils. The ages of the grains from surface A horizons and buried A horizons were ca 100-200 BP and ca 300-1,200 BP, respectively. In comparison with humic acid extracts, the ^<14>C ages were in the increasing order: humic acid fraction <humic acid Pg fraction <sclerotium grains. The δ^<13>C values for sclerotium grains in surface A horizons and buried A horizons were approximately-31‰ to -28‰, and these values were approximately 2-4‰ smaller than those of humic acids and soils. The C content of the grains had a tendency to decrease with increasing ^<14>C ages, while the C content of humic acid was constant with age. The ^<14>C ages of sclerotium grains indicate the individual age of grain formation, which are more likely to assign closer ages to the beginning of soil forming than the ^<14>C ages of humic acid. The low δ^<13>C values for sclerotium grains have presumably originated from characteristically biological organics, which may be protected from attack in soils because of their structure.
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