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Soil Morphology-Water Table Cumulative Duration Relationships in Southern New England

^a USDA-NRCS, Norwich, CT
^b Dep. of Natural Resources Science, Univ. of Rhode Island, Kingston, RI 02881

View larger version (30K): [in a new window]   Fig. 1. Water table hydrographs for the Clayhead 2, Turnip Farm 19, and Mansion Beach 5 wells. The average seasonal high water table (ASHWT) depth for Clayhead 2, Turnip Farm 19, and Mansion Beach 5 wells are 44, 66, and 48 cm, respectively.

View larger version (25K): [in a new window]   Fig. 2. Relationships between the depth to the average seasonal high water table (ASHWT) and depth to redoximorphic features (RMFs). Graph A shows the relationship between the depth to the ASHWT and the first horizon with >2% RMFs with 16 of the 20 wells considered together (regardless of texture). The ASHWT was not calculated for four of the sites because the water table was either often below the bottom of the well during the time of year the ASHWT was calculated or was never present in the well over the duration of the study. Graphs B, C, and D show the relationship between the ASHWT and RMFs for loamy textured horizons. Graph B shows the relationship between the depth to the ASHWT and the depth to the first loamy horizon with either >2% concentrations or >2% depletions. Graph C shows the relationship between the depth to the ASHWT and the depth to the first loamy horizon with >2% concentrations but <2% depletions. Graph D shows the relationship between the depth to the ASHWT and the depth to the first loamy horizon with >2% depletions. The dashed line represents a 1:1 relationship.

View larger version (27K): [in a new window]   Fig. 3. Graph of the cumulative saturation with depth for the Turnip Farm 20 site. Shaded areas represent horizons with described redox features. At this site the soil was saturated above the shallowest expression of redox features for roughly 13% (67 d) of the 18 mo-long study period.

View larger version (11K): [in a new window]   Fig. 4. Boxplots showing the relationship between cumulative saturation and the abundance of redoximorphic features in loamy textured horizons for the 18 mo-long study period. The three outliers from the 66 data points were removed before statistical analysis. A one way analysis of variance and Tukey's multiple comparison tests were used to determine differences between means. Means of boxplots with different letters are significantly different at the 0.05 level. Values below the x axis indicate the number of horizons having this class of redoximorphic feature (RMF). * indicates outliers.

View larger version (12K): [in a new window]   Fig. 5. Boxplots showing relationship between cumulative saturation and the abundance of redox features in coarse textured horizons for the 18 mo-long study period. There was no significant difference between categories at the 0.05 level. Values below the x axis indicate the number of horizons having this class of redoximorphic feature (RMF).

View larger version (10K): [in a new window]   Fig. 6. Boxplots showing relationship between cumulative saturation and the abundance of redox features at the Mansion Beach site for the 18 mo-long study period. There was no significant difference between categories at the 0.05 level. Values below the x axis indicate the number of horizons having this class of redoximorphic feature (RMF). * indicates outliers.