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Fig. 6. Principal component analysis (PCA) of the soil microbial community shifts in pasture sites as affected by different poultry litter application rates according to the abundance of fatty acid methyl ester (FAME) indicators of fungal, bacterial, and actinomycetes groups. Each symbol specifies the year of sampling (02 = 2002, 03 = 2003, 04 = 2004), and the litter rates (C = control, L = 6.7 Mg ha–1, H = 13.4 Mg ha–1). The PCA provides a comparison of the fungal to bacterial (F:B) populations ratio among the soils. The soils located near the microbial group specified indicate they have higher relative abundance of such microbial group.
