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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