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In Situ Ground Water Denitrification in Stratified, Permeable Soils Underlying Riparian Wetlands

^a Department of Natural Resources Science, 105 Coastal Institute in Kingston, University of Rhode Island, Kingston, RI 02881
^b Institute of Ecosystem Studies, Box AB, 65 Sharon Turnpike, Millbrook, NY 12545

View larger version (33K): [in a new window]   Fig. 1. Location of study Sites A, B, C, and D within the Pawcatuck River Watershed, Rhode Island, USA.

View larger version (22K): [in a new window]   Fig. 2. Comparison of ground water denitrification rates from mini-piezometers that were sampled over two years, but during the same season. Rates from Year 1 were significantly correlated with rates from Year 2 with r = 0.91 at P < 0.05.

View larger version (21K): [in a new window]   Fig. 3. Mean annual riparian ground water denitrification rates versus distance from the stream at (a) 150 cm and (b) 260 to 300 cm below the soil surface. Spearman rank correlations between denitrification rates and distance from the stream were significant at P < 0.01. Error bars signify ±1 SE.

View larger version (19K): [in a new window]   Fig. 4. Mean annual riparian ground water denitrification rates versus weighted average soil carbon content at (a) 65 cm and (b) 150 cm below the soil surface. Spearman rank correlations between denitrification rates and the weighted average of % C in samples from horizons at (a) 55 to 75 cm and (b) 140 to 160 cm below the soil surface were not significant. Error bars signify ±1 SE (n = 6).