Experimental decomposition of particulate organic matter collected under the fast ice in Lutzow-Holm Bay, Antarctica with special reference to fate of carbon, nitrogen and phosphorus

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Available information on the decomposition of particulate organic materials under the fast ice is scarce. To estimate the in situ degradation, decomposition experiments of various kinds of particulate matter collected under the fast ice near Syowa Station (69°00′S, 39°35′E) were conducted at -1.5℃ in the dark for 7 months from February to October 1984. The variations of Chl. a, carbon, nitrogen, phosphorus and oxygen consumption were particularly noted. Among the samples, particulate materials obtained by sediment traps set under the fast ice showed the most active decomposition compared with net plankton and surface sediment. In the decomposition of trapped sediment, two steps of first order reaction were observed. Corresponding rate constants for decomposition estimated from the variation of Chl. a, POC, PON were 0.021-0.081 day^<-1> for k_1 (first step) and 0.016-0.0023 for k_2 (second step), respectively. These results indicate a fairly fast in situ decomposition of particulate organic matter under the fast ice.
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