期刊
CHEMISTRY AND ECOLOGY
卷 19, 期 5, 页码 373-390出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/02757540310001609370
关键词
Detritus; Decomposition; Stable carbon isotopes; Stable nitrogen isotopes; Stoichiometry
资金
- National Science Foundation [9910514]
- NSF-REU supplement
- Div Of Biological Infrastructure
- Direct For Biological Sciences [9910514] Funding Source: National Science Foundation
The decomposition of the mangrove Rhizophora mangle and the seagrass Thalassia testudinum was examined using litterbags along a natural gradient in nutrient availability. Seagrass leaves had a higher fraction of their biomass in the labile pool (57%), compared to mangrove leaves (36%) and seagrass rhizomes (29%); the overall decomposition rates of the starting material reflected the fractionation into labile and refractory components. There was no relationship between the N or P content of the starting material and the decomposition rate. Nutrient availability had no influence on decomposition rate, and mass was lost at the same rate from litterbags that were buried in the sediment and litterbags that were left on the sediment surface. The dynamics of N and P content during decomposition varied as a function of starting material and burial state. N content of decomposing mangrove leaves increased, but seagrass rhizomes decreased in N content during decomposition while there was no change in seagrass leaf N content. These same general patterns held for P content, but buried seagrass leaves increased in P content while surficial leaves decreased. C-13 and N-15 changed by as much as 2 parts per thousand during decomposition.
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