Decomposition of macroalgae and the release of nutrient Admiralty Bay, King George, Antarctica

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On land and in the shore zone macroalgae are a source of organic matter and of nutrients. A crumbled mixture of macroalgae and 10 selected species of macroalge were used in investigations. In long (22-69 days) and short (11-52 hours) term experiments the quantities of released nutrients per 1 kg of dry mass of identified macroalgae were: for nitrogen 10.6-93.7 mg NO2--N, 12.9-406 mg, NO3--N, 74.0-7890 mg NH4+-N, and 1110-22000 mg total-N; for phosphorus the figures were: 718-6110 mg reactive-P and 1370-13400 mg total-P. The amounts of ammonium-N, total-N, reactive-P and total-P, released from the mixture of disintegrated algae collected on the beach, were lower than those from fresh algae. Nitrate-N, reactive-P and total-P were liberated most readily. From the total amounts of nutrients in the long and short term experiments about 80% were released during the first 3 days and the first 3 hours respectively. The decomposition of macroalgae may improve the fertility of poor soils and inland water as well as of sea water, being a source of nutrients.
国立極地研究所の論文
2004-02-01