Abstract

Short-term (3–6 d) and long-term (27 d) laboratory experiments were carried out to determine the distribution of assimilated carbon in the system of common reed (Phragmites australis (Cav.) Trin. ex Steud.) — waterlogged fen soil after 14C pulse labelling. Maximally 2% of the assimilated plant 14C were released from the fen soil as CO2 and about 5 to 9 % remained in the soil. The remaining 14C from reed plants grown in waterlogged fen soil had the same proportion as that in the cultivated plant grown in mineral soil, despite of lower 14C release (i. e. rhizodeposition and root respiration) from reed roots. This reveals that turnover of assimilated carbon in the waterlogged fen soil is much slower compared to mineral soils.

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