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Carbon dynamics in soil recorded by 14C: model calculations

Kuc T., Gorczyca Z., Kapusta M.

Geochronometria

2004

Vol. 23

45-50

Time records of 14CO2 from soil respiration collected in the years 1998 to 2003 on sites representing different ecosystems (mixed wood, agricultural field and grassland, southern Poland), were analysed by use of MLB model built for this purpose. The modelled turnover time (TT) is maximum 22 yr for the agriculturally cultivated soil and only 14 yr for soil under grassland and mixed forest. About 22% of an old component of 1500 yr was admixed to the agriculturally cultivated soil while it was only 12% under mixed forest. Estimated ratio of carbon content in slow and in fast decomposition boxes varies from 22 to 40 in southern Poland pointing to slow decomposing organic compounds as the major pool of carbon in soil. The lowest ratio was observed for soil of low proportion of organics content in mixed forest, and the highest for grassland of well developed soil profile. D14C time records for not cultivated soils (under grassland and mixed forest) showed higher values than local atmospheric CO2, moreover 14CO2 from the mixed forest soil respiration remarkable exceeded "clean air" reference level for Central Europe.