Soil hydraulic properties as influenced by prairie restoration

Prairie restoration has received increased public attention in recent years for its ecosystem services. The objective of this study was to evaluate effects of prairie restoration on soil hydraulic properties as compared to native prairie (NP), grass and row-crop management. Soil cores (76 mm diam. x 76 mm long) from six replicate locations were sampled to a 60-cm depth at 10-cm intervals from two prairie treatments, a continuous no-till treatment (NT), a long-term timothy grass (Phleum pratense L) treatment (TM) and a row-crop (RC) treatment. The NP has never been tilled and the restored prairie (RP) was established in 1993. All treatments have Mexico silt loam (fine, smectitic, mesic, Vertic Epiaqualfs) soil. Bulk density, saturated hydraulic conductivity (Ksat), soil water retention and pore size distribution were determined. In-situ K-sat was measured using a constant head permeameter with five replications. Bulk density was significantly lower for NP than all treatments. Bulk density was significantly lower for the 0 to 10 cm depth for all treatments, and the 10 to 30 cm depth recorded the highest values. The in-situ K-sat of RP was lower than other treatments. The first horizon had the highest value for this parameter for all treatments. NP had significantly higher laboratory measured K-sat, and it was almost four times higher than RP. The 0 to 10 cm depth of all treatments had significantly higher values for laboratory Ksat than other depths and the 50 to 60 cm showed the lowest K-sat. NP had the highest macroporosity and fine-mesoporosity, while RP had the highest microporosity. NP had significantly higher water retention at saturation while RP had the highest water retention for soil water pressures of -33 kPa, -100 kPa and -1500 kPa. Soil water retention was significantly higher in NP for -0.4 kPa to -10 kPa soil water pressures; at -20 kPa NP, RP and RC had significantly higher water retention. The NP treatment had higher soil water content than the other treatments for the 0 to 10 cm, 10 to 20 cm, 20 to 30 cm and 50 to 60 cm depths at soil water pressure of -20 kPa. The 30 to 40 cm and 40 to 50 cm depths of RP had higher soil water content at all soil water pressures. Results imply that prairie restoration influences some hydraulic properties in claypan soils; however, it is unlikely to achieve the original prairie soil characteristics due to the prior erosion of the top soil. (C) 2016 Elsevier B.V. All rights reserved.