Skip to main content
Ecological Processes

Table 3 The variance analysis of the RGR, root activity, Chl T content, SOD activity, CAT activity, REC, and MDA content of P. cordata under the simulated acid rain spraying times, simulated acid rain (SAR) and simulated eutrophication

From: Physiological responses and algae inhibition of Pontederia cordata to simulated eutrophication and acid rain co-pollution

Indicators

Source

Type III sum of squares

df

Mean square

F

Sig.

RGR (%)

Modified model

9333.150

11

848.468

12.879

 < 0.05

SAR

2189.120

2

1094.560

16.615

 < 0.05

Eutrophication

5282.438

3

1760.813

26.728

 < 0.05

SAR × eutrophication

1861.592

6

310.265

4.710

 < 0.05

Error

1581.106

24

65.879

  

Total

10,914.255

35

   

Root activity (μg·g−1·h−1)

Modified model

352.927

11

32.084

807.998

 < 0.05

SAR

98.645

2

49.323

1242.123

 < 0.05

Eutrophication

133.333

3

44.444

1119.271

 < 0.05

SAR × eutrophication

120.948

6

20.158

507.653

 < 0.05

Error

0.953

24

0.040

  

Total

353.879

35

   

Chl T content (mg·g−1)

Modified model

74,306,691.659

47

1,580,993.440

72.569

 < 0.05

Spraying time

43,701,031.990

3

14,567,010.660

668.640

 < 0.05

SAR

8,536,639.803

2

4,268,319.902

195.920‍

 < 0.05

Eutrophication

7,771,249.193

3

2,590,416.398

118.903‍

 < 0.05

Spraying time × SAR

936,064.140

6

156,010.690

7.161‍

 < 0.05

Spraying time × eutrophication

7,071,024.968

9

785,669.441

36.063‍

 < 0.05

SAR × eutrophication

2,580,471.667

6

430,078.611

19.741‍

 < 0.05

Spraying time × SAR × eutrophication

3,710,209.899

18

206,122.772

9.461‍

 < 0.05

Error

2,091,459.343

96

21,786.035

  

Total

76,398,151.002

143

   

SOD activity (U·g−1)

Modified model

14,410.544

47

306.607

204.383

 

Spraying time

9056.557

3

3018.852

2012.351

 < 0.05

SAR

529.412

2

264.706

176.451

 < 0.05

Eutrophication

570.129

3

190.043

126.682

 < 0.05

Spraying time × SAR

624.470

6

104.078

69.378

 < 0.05

Spraying time × eutrophication

668.070

9

74.230

49.481

 < 0.05

SAR × eutrophication

706.253

6

117.709

78.464

 < 0.05

Spraying time × SAR × eutrophication

2255.654

18

125.314

83.534

 < 0.05

Error

144.016

96

1.500

  

Total

14,554.560

143

   

CAT activity (U·g−1·min−1)

Modified model

48,394,887.489

47

1,029,678.457

138.113

 < 0.05

Spraying time

34,115,828.370

3

11,371,942.790

1525.343‍

 < 0.05

SAR

1,986,408.073

2

993,204.036

133.221‍

 < 0.05

Eutrophication

3,350,353.184

3

1,116,784.395

149.797‍

 < 0.05

Spraying time × SAR

1,570,254.211

6

261,709.035

35.104‍

 < 0.05

Spraying time × eutrophication

5,552,955.866

9

616,995.096

82.759‍

 < 0.05

SAR × eutrophication

304,539.296

6

50,756.549

6.808‍

 < 0.05

Spraying time × SAR × eutrophication

1,514,548.493

18

84,141.583

11.286‍

 < 0.05

Error

715,712.233

96

7455.336

  

Total

49,110,599.720

143

   

REC (%)

Modified model

39,799.495

47

846.798

291.970

 

Spraying time

21,763.019

3

7254.340

2501.250

 < 0.05

SAR

2892.592

2

1446.296

498.674

 < 0.05

Eutrophication

7238.790

3

2412.930

831.963

 < 0.05

Spraying time × SAR

965.229

6

160.872

55.467

 < 0.05

Spraying time × eutrophication

2038.650

9

226.517

78.101

 < 0.05

SAR × eutrophication

1150.834

6

191.806

66.133

 < 0.05

Spraying time × SAR × eutrophication

3750.381

18

208.354

71.839

 < 0.05

Error

278.427

96

2.900

  

Total

40,077.922

143

   

MDA content (nmol·g−1)

Modified model

4963.725

47

105.611

225.012

 < 0.05

Spraying time

1186.218

3

395.406

842.441‍

 < 0.05

SAR

1493.204

2

746.602

1590.689‍

 < 0.05

Eutrophication

1625.039

3

541.680

1154.087‍

 < 0.05

spraying time × SAR

63.515

6

10.586

22.554‍

 < 0.05

Spraying time × eutrophication

64.575

9

7.175

15.287‍

 < 0.05

SAR × eutrophication

410.638

6

68.440

145.816‍

 < 0.05

Spraying time × SAR × eutrophication

120.536

18

6.696

14.267‍

 < 0.05

Error

45.058

96

0.469

  

Total

5008.783

143

   
  1. Differences in the seven indicators following interactive effects of four spraying times, four eutrophication levels (E0, E1, E2, and E3) and three pH levels (7.0, 5.0, and 4.0) were analyzed using a general linear model (GLM), with spraying time, eutrophication, and pH as fixed factors, and the RGR, root activity, or Chl T, or SOD, or CAT, or REC, or MDA as a dependent variable (Additional file 1)
Back to article page