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Denitrification Enzyme Activity of Fringe Salt Marshes in New England (USA)

^a USEPA Office of Research and Development, National Health and Environmental Effects Research Laboratory, Atlantic Ecology Division, 27 Tarzwell Drive, Narragansett, RI 02882
^b OAO Corporation, 27 Tarzwell Drive, Narragansett, RI 02882
^c Institute of Ecosystem Studies, PO Box AB, Millbrook, NY 12545

View larger version (32K): [in a new window]   Fig. 1. Location of the salt marshes and adjacent watersheds of the sites in the bay-wide survey (see Table 1 for site descriptions), and Nag Creek, which was the site of the Prudence Island fertilization experiment.

View larger version (11K): [in a new window]   Fig. 2. Denitrification enzyme activity (DEA) values (±SE) of the controls and N- and P-amended plots from the Prudence Island fertilization experiment. * Significant at the 0.05 probability level.

View larger version (9K): [in a new window]   Fig. 3. Response (mean denitrification enzyme activity, log-transformed kg N ha–1 yr–1) to N and P treatments. There was a significant (p < 0.05) main effect of N, but no significant effect of P and no significant N x P interaction. * Significant at the 0.05 probability level.

View larger version (19K): [in a new window]   Fig. 4. The relationship from the bay-wide survey between denitrification enzyme activity (DEA) in the high marshes and watershed N loads in fall (a) 1998 and (b) 2000.

View larger version (19K): [in a new window]   Fig. 5. The relationship from the bay-wide survey between denitrification enzyme activity (DEA) in the high marshes and percent hydric soils in an adjacent terrestrial buffer in (a) fall 1998 and (b) spring 1999.