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Soil Microbial Biomass Relationships with Organic Matter Fractions in a Nebraska Corn Field Mapped using Apparent Electrical Conductivity

^a Dep. of Agronomy and Horticulture, Univ. of Nebraska, Lincoln, NE 68583
^b Dep. of Statistics, Univ. of Nebraska, Lincoln, NE 68506
^c USDA-ARS, Soil and Water Conservation Research Unit, Lincoln, NE 68583

View larger version (75K): [in a new window]   Fig. 1. Four ECa classes and location of sampling sites (circles) in each class at the Buffalo Co., NE study site. : 19–20 dS m–1; : 21–22 dS m–1; : 23–25 dS m–1; : 28–35 dS m–1.

View larger version (24K): [in a new window]   Fig. 2. Apparent electrical conductivity (ECa) classes and (a) clay content (0–90 cm), (b) total C (0–90 cm), (c) topsoil depth, and (d) total dissolved solids content (0–90-cm). Bars followed by the same letter within ECa classes are not significantly different (p < 0.05). Error bars represent ± one standard error of the mean.

View larger version (26K): [in a new window]   Fig. 3. Apparent electrical conductivity (ECa) classes and (a) clay content (0–15 cm), (b) total C (0–15 cm), (c) extractable P (0–15 cm) and (d) total and fine POM (0–15 cm). Bars followed by the same letter within ECa classes are not significantly different (p < 0.05). Error bars represent ± one standard error of the mean.

View larger version (25K): [in a new window]   Fig. 4. Apparent electrical conductivity (ECa) classes and biological soil properties in the 0- to 15-cm depth. (a) Total microbial biomass measured as lipid P; (b) Bacteria = bacterial markers (iC15:0, aC15:0, C15:0, iC16:0, iC17:0, aC17:0, C17:0, cyC17:0, cyC19:0,C16:1cis7); (c) Actinomycetes = actinomycetes markers (i10MeC18:0, 10MeC18:0); and d) Fungi = fungal marker (C18:2cis9,12) and Mycorrhizae = mycorrhizal marker (C16:1cis11). Bars followed by the same letter within ECa classes are not significantly different (p < 0.05). Error bars represent ± one standard error of the mean.

View larger version (15K): [in a new window]   Fig. 5. Correlations among coarse and fine particulate organic matter fractions and different microbial groups during V6 stage of corn.