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Influence of Grass and Agroforestry Buffer Strips on Soil Hydraulic Properties for an Albaqualf

^a North West Provincial Dep. of Agriculture, Soil Science Section, Private Bag X804, Botha Street, Potchefstroom, South Africa 2520
^b Dep. of Soil, Environmental and Atmospheric Sciences, 302 Anheuser-Busch Natural Resources Building, Univ. of Missouri, Columbia, MO 65211
^c Center for Agroforestry, 203 Anheuser-Busch Natural Resources Building, Univ. of Missouri, Columbia, MO 65211

View larger version (45K): [in a new window]   Fig. 1. Topographic map of study site with 0.5-m elevation interval contour lines (thin black lines), agroforestry buffer strips (wide gray lines), and sampling region (superimposed box). A grass waterway is located at the outflow end of the watershed (wider gray line; modified from Udawatta et al., 2002). The inset map shows location of watershed in Missouri.

View larger version (28K): [in a new window]   Fig. 2. Soil water retention curves for row crop (RC), grass buffer (GB), and agroforestry buffer (Ag) treatments at depths of (A) 0 to 10 cm, (B) 10 to 20 cm, (C) 20 to 30 cm, and (D) 30 to 40 cm. Bars indicate LSD (0.05) values and are presented at pressures when significant differences occurred among treatments.

View larger version (27K): [in a new window]   Fig. 3. Porosity values for selected pore-size classes for row crop (RC), grass buffer (GB), and agroforestry buffer (Ag) treatments as influenced by soil depth. Pore-size classes include (A) macropores (>1000-µm diam.), (B) coarse mesopores (60- to 1000-µm diam.), (C) fine mesopores (10- to 60-µm diam.), and (D) micropores (<10-µm diam.). Bars indicate LSD (0.05) values and are presented for pore-size classes with significant differences among treatments.

View larger version (19K): [in a new window]   Fig. 4. (A) Bulk density and (B) saturated hydraulic conductivity (Ksat) for row crop (RC), grass buffer (GB), and agroforestry buffer (Ag) treatments as influenced by soil depth. (A) The bar indicates the LSD (0.05) value for bulk density, and (B) the LDS (0.05) value for Ksat is listed on the graph due to the log scale.