Table 1 Results from “best” model selection procedure presented for each number of predictor variables of specific species at the phylum and class level (Relative abundance > 1%).

From: Responsiveness of soil nitrogen fractions and bacterial communities to afforestation in the Loess Hilly Region (LHR) of China

Phylum level

Class level

Number variables

R

Predictor variables

Number variables

R

Predictor variables

Global Test

Ra = 0.417

Pc = 3.3%

Global Test

Rb = 0.496

Pd = 0.9%

1

0.417

DON

1

0.448

DON

2

0.371

DON, MBN

2

0.496

DON, MBN

2

0.337

TN, DON

2

0.377

TN, DON

2

0.319

AN, DON

2

0.376

AN, DON

2

0.196

NN, DON

3

0.470

AN, DON, MBN

3

0.354

AN, DON, MBN

3

0.385

TN, DON, MBN

3

0.300

TN, DON, MBN

3

0.339

NN, DON, MBN

3

0.271

TN, AN, DON

3

0.304

TN, AN, DON

3

0.225

NN, DON, MBN

4

0.321

TN, AN, DON, MBN

4

0.229

TN, AN, DON, MBN

4

0.308

AN, NN, DON, MBN

5

0.117

TN, AN, NN, DON, MBN

5

0.251

TN, AN, NN, DON, MBN

  1. Number of permutations: 999 (Random sample). a,bMeans the Sample statistic (Average R); c,dMeans the significance level of sample statistic.