Long-term decomposition of DOC from experimental diatom blooms
- Ecosystems Center, Woods Hole, MA (United States)
Decomposition of {sup 13}C-labeled dissolved organic carbon (DOC) produced in two marine diatom blooms was followed for 2.5 yr with large volume (20 liter) incubations performed in the dark. The {sup 13}C tracer was used to partition decomposition dynamics of the fresh diatom-derived DOC and the turnover of background DOC from Woods Hole Harbor. DOC from Woods Hole harbor proved largely refractory, with DOC concentrations falling from 122 to {approximately} 100 {mu}M C in 2.5 yr. DOC from the diatom blooms was more labile, but was also incompletely mineralized, with 25-35% remaining after 2.5 yr. Neither nutrients nor labile carbon (dextrose) added at 1.5 yr significantly stimulated DOC mineralization. The experiments indicate that DOC produced in short-term blooms can be surprisingly resistant to microbial attack. 21 refs., 1 fig., 1 tab.
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- FG02-92ER61438
- OSTI ID:
- 518279
- Journal Information:
- Limnology and Oceanography, Vol. 41, Issue 6; Other Information: PBD: Sep 1996
- Country of Publication:
- United States
- Language:
- English
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