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Temporal and Spatial Development of Surface Soil Conditions at Two Created Riverine Marshes

^a The Schiermeier Olentangy River Wetland Research Park, School of Natural Resources, The Ohio State University, 352 West Dodridge Street, Columbus, OH 43202
^b Present address: School of Civil Engineering and Environmental Science, The University of Oklahoma, 202 West Boyd Street, Norman, OK 73019

View larger version (66K): [in a new window]   Fig. 1. The two experimental wetlands at The Olentangy River Wetland Research Park (ORWRP) at The Ohio State University in Columbus, Ohio, including pumping system and water control structures.

View larger version (68K): [in a new window]   Fig. 2. The 10-m grid and locations used for soil sampling at the Olentangy River Wetland Research Park (ORWRP) experimental wetlands in 1993, 1995, and 2004. Shaded areas within the grid map represent approximate location of the deeper, open water (OW) zones.

View larger version (49K): [in a new window]   Fig. 3. Comparison of combined mean (±1 SE) for (a) percent organic matter (n = 32), (b) total C (n = 18), (c) total P (n = 18), (d) available P (n = 28), (e) exchangeable Ca (n = 28), (f) exchangeable K (n = 28), (g) exchangeable Mg (n = 28), and (h) soil pH (n = 28) at the Olentangy River Wetland Research Park (ORWRP) experimental wetlands in 1993, 1995, and 2004 at 0- to 8- and 8- to 16-cm depths. Letters denote differences between years and depths detected at p < 0.05 based on Wilcoxon Signed Ranks Test (Bonferroni adjusted).

View larger version (23K): [in a new window]   Fig. 4. Frequency distribution curves of soil organic matter in 1993, 1995, and 2004 for (a) Wetland 1 and (b) Wetland 2 based on spatially interpolated data.

View larger version (54K): [in a new window]   Fig. 5. Spatial distribution maps of soil organic matter for Wetlands 1 and 2 in (a) 1993, (b) 1995, and (c) 2005. Maps for 1993 and 2004 were generated by ordinary point kriging using isotropic variogram models. Maps for 1995 were generated using the inverse distance weighing method for spatial interpolation (see text).