Deposition and cycling of carbon and nitrogen in carbonate mud of the lagoons of Arlington and Sudbury Reefs, Great Barrier Reef

被引:27
作者
Alongi, DM [1 ]
Pfitzner, J [1 ]
Trott, LA [1 ]
机构
[1] Australian Inst Marine Sci, Townsville, Qld 4810, Australia
关键词
carbon; carbonate; lagoon; nitrogen; sediment; Great Barrier Reef;
D O I
10.1007/s00338-005-0069-2
中图分类号
Q17 [水生生物学];
学科分类号
071004 ;
摘要
The dynamics of carbon and nitrogen in carbonate mud were examined in the lagoons of Arlington and Sudbury Reefs, Great Barrier Reef. Most (89-93%) of the organic carbon and total nitrogen depositing to the carbonate mud zones was mineralized over a sediment depth of 1 m, with similar to 50% of CO2 produced during microbial decomposition involved in carbonate precipitation/dissolution reactions. There was proportionally little burial of organic carbon (10-11%) or nitrogen (7-10%). Nitrogen budgets suggest rapid turnover of porewater inorganic N pools on the order of hours to a few days. Incubation experiments indicate carbonate dissolution in surface deposits (<= 20 cm depth) and carbonate precipitation in deeper sediments. Depth- integrated reaction rates indicate net carbonate precipitation of 7-10 mol CaCO3 m(2) year(-1) over a depth of 1 m. Budget calculations at the whole-reef scale imply that deposition of CaCO3 in the mud zones of both lagoons may equate to 50-90% of total reef carbonate production, with organic carbon fluxes equating to nearly all net primary production on each reef. These biogeochemical estimates point to the functional importance of carbonate mud zones in the lagoons of the shelf reefs of the Great Barrier Reef.
引用
收藏
页码:123 / 143
页数:21
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