Response of the abundance of key soil microbial nitrogen-cycling genes to multi-factorial global changes.

Results The effect of environmental changes on soil physicochemical indices and gene abundances In the first experiment, for the six soil physicochemical indices (total C, total N, NH 4 + -N, NO 3 - -N, water contents and pH), as PFG number decreased from 3 to 0, only NO 3 - -N content showed an increasing trend, although its difference among the four PFG gradients was non-significant ( P >0.05; Fig. 1a1–f1 ).

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