Rapid increases in soil pH solubilise organic matter, dramatically increase denitrification potential and strongly stimulate microorganisms from the <i>Firmicutes</i> phylum.

For example, at continental scales there is evidence to suggest that Acidobacteria populations have a negative trend as pH increases (>4) but within phyla the relative abundance of Acidobacteria subgroups exhibit opposing trends as pH increases ( Lauber et al., 2009 ).

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Respiration in the control and pH 6.7 microcosms generally followed an increasing trend for the first 32 h before decreasing ( Table 1 ).

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