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Fig. 5. Nematodes by functional groups in the (A) 0–5 cm, (B) 5–15 cm, and (C) 15–30 cm soil layers: b1, bacterial-feeding nematode and colonizer-persister (cp) 1; b2, bacterial-feeding nematode cp 2; f2, fungal-feeding nematode cp 2; pp2, plant parasitic nematode cp 2; pp3, plant parasitic nematode cp 3; o4,5, omnivorous nematodes cp 4 or 5. Data are means ± SE. Means followed by the same letter are not significantly different at the P < 0.05 level. Uppercase letters compare treatments for the entire nematode population at each depth. Standard errors are shown by error bars. NT = no-tillage; ST = standard tillage; CC = continuous cropping; and F = fallow. In the 0- to 5- and 5- to 15-cm soil layers, no treatment effects occurred for any functional group, while in the 15- to 30-cm layer, b1 in STCC was significantly higher than in NTCC or NTF.
