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Seasonal Dynamics of Denitrification along Topohydrosequences in Three Different Riparian Wetlands

U.M.R. 6553-ECOBIO, Université de Rennes I, Avenue du Général Leclerc, F-35042 Rennes cedex, France

View larger version (40K): [in a new window]   Fig. 1. (a) Location of the study site and map of the studied wetland. (b) Average nitrate concentration (with standard deviation, n = 138) in ground water below the soil topohydrosequence. m.a.s.l., meters above sea level.

View larger version (32K): [in a new window]   Fig. 2. Rainfall, air temperature, and water table elevation measurements in the three sampling zones of the three study sites between January 1998 and March 2000. Forest site data started later since this site was equipped with piezometers in August 1998.

View larger version (46K): [in a new window]   Fig. 3. Seasonal changes of in situ denitrification (DNT) (mean and standard errors, for n = 3) in soil profiles along the three topohydrosequences.

View larger version (44K): [in a new window]   Fig. 4. Seasonal changes of potential denitrification (ANACN) (mean and standard errors, for n = 3) in soil profiles along the three topohydrosequences.

View larger version (38K): [in a new window]   Fig. 5. Comparison of annual average (with standard errors, n = 12) of in situ (DNT) and potential (ANACN) denitrification rates in soil profiles along the three topohydrosequences. (Statistical differences between in situ and potential are given by asterisks: ***, p 0.001; **, p 0.01; *, p 0.05; ns, nonsignificant.)

View larger version (38K): [in a new window]   Fig. 6. Seasonal variations of denitrification-limiting factors in the upper horizon (0–25 cm) of the three topohydrosequences. Average values (with standard errors) for all sites (n = 9).

View larger version (32K): [in a new window]   Fig. 7. Denitrification limiting factors in the upper soil horizon (0–25 cm) of the topohydrosequence. Seasons and sites have been pooled together (means and standard errors, n = 36). ANA, denitrification activity of soil samples incubated with acetylene under N2 atmosphere alone. ANAC, denitrification activity of soil samples amended with carbon (4 g glucose kg-1 fresh soil) and incubated with acetylene under N2 atmosphere. ANAN, denitrification activity of soil samples amended with nitrate (10 mg NO3–N kg-1 fresh soil) and incubated with acetylene under N2 atmosphere.