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. 2012 Mar 2;3:77. doi: 10.3389/fmicb.2012.00077

Figure 1.

Figure 1

Potential nitrifying enzyme activity (NEA) measured in the eight soils from September 2009 to October 2010 (A), and the difference observed in the amplitude of variation in sandy (Δtsandy = 0.14  μgN  h− 1  gdw− 1 ± 0.04), and in clayey soils (Δtclayey = 0.39  μgN  h− 1  gdw− 1 ± 0.08) over time (B), calculated by subtracting lower from higher values. Soil names are: B, Buinen; V, Valthermond; D, Droevendaal; W, Wildekamp; K, Kollumerwaard; S, Steenharst; G, Grebbedijk; and L, Lelystad. Bars are SE (n = 4). Black symbols: sandy soils; gray symbols, clayey soil.