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Table 1 The relationships of microbial community functional structure to plant and soil characteristics by RDA and VPA a

From: Elevated CO2 influences microbial carbon and nitrogen cycling

   All genes detected C cycling genes N cycling genes
With nine selected variables First axis explanation (%) 19.1 20.3 19.6
  Total explanation (%) 42.2 42.8 42.8
  F 1.138 1.167 1.163
  p 0.098 0.072 0.087
Explanations of the selected plant variables (%) Total 24.7 24.6 25.1
  The number of plant functional groups (PFG) 5.9 4.5 5.1
  Belowground plant C percentage (BPC) 4.4 4.5 4.5
  Biomass of C4 plant species Andropogon gerardi (BAG) 4.4 3.7 4.5
  Biomass of C4 plant species Bouteloua gracilis (BBG) 3.7 4.5 3.8
  Biomass of legume plant species Lupinus perennis (BLP) 6.0 6.0 6.4
Explanations of the selected soil variables (%) Total 19.4 19.0 19.7
  Soil N% at the depth of 0-10 cm (SN0-10) 5.7 5.2 4.5
  Soil N% at the depth of 10-20 cm (SN10-20) 4.4 4.5 5.1
  Soil C and N ratio at the depth of 10–20 cm (SCNR10-20) 4.4 4.5 3.8
  pH 4.4 5.2 5.1
  1. a The covariables for plant and soil variables were close zero.