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Table 3 Stepwise regression analysis (SRA) used to identify the critical factors of plant biomass and diversity

From: Divergent responses of plant biomass and diversity to short-term nitrogen and phosphorus addition in three types of steppe in Inner Mongolia, China

  Item Equations R2 Sig n
N addition AGB AGB = − 476.32 + 747.32TP + 1.504MAP 0.827 0.000*** 42
BGB BGB = 1367.7 + 34.1NH4+ − 145.69MAT + 2513.50TP 0.840 0.000*** 42
H H = 2.317 − 0.309TN 0.832 0.000*** 42
Ma Ma = 2.545 − 0.547TN 0.849 0.000*** 42
P addition AGB AGB = − 341.51 + 231.86TP + 1.30MAP + 14.48MAT 0.859 0.000*** 42
BGB BGB = 1118.3 + 69.20NH4+ − 125.55MAT + 2107.50TP 0.904 0.000*** 42
H H = 2.12–0.276TN + 0.567TP − 0.005NO3 0.903 0.000*** 42
Ma Ma = 3.340–0.371TN − 0.021AP + 0.144MAT + 0.029NH4+ − 0.215pH 0.957 0.000*** 42
  1. *** indicates level of significance: P < 0.001