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Table 3 P concentrations (mg kg−1) in the soils of the Green Island chronosequence

From: Sequestration of P fractions in the soils of an incipient ferralisation chronosequence on a humid tropical volcanic island

Bench height (m)

Horizon

Total

Pt

KCl

Pi

NaHCO3

Pi

NaHCO3

Po

NaOH

Pi

NaOH

Po

HCl

Pi

Sum of

extracts

Residual

P

Overall

Pi%

Overall

Po%

15

A

564

3.20

12.6

79

9.16

225

120

449

75

32.3

67.7

 

C1

477

2.11

9.15

84

6.28

163

125

390

285

36.6

63.4

 

C2

471

1.80

9.80

81

5.30

145

127

370

235

38.9

61.1

 

C3

213

0.85

4.44

82

3.71

142

123

356

65

37.1

62.9

20

A

783

1.43

24.4

133

138

489

129

915

424

32.0

68.0

 

Bw

296

0.65

4.74

63

92

292

19.4

42

107

24.9

75.1

 

BC

113

0.63

3.94

53

35

121

21.0

235

60.0

25.8

74.2

 

C

322

0.61

4.05

67

28

111

284

555

75.0

67.9

32.1

50

A

536

0.68

11.7

86

195

271

1.97

567

430

36.9

63.1

 

Bt1

475

0.35

5.65

97

145

257

2.31

507

381

30.2

69.8

 

2 A

427

0.39

4.00

98

142

285

1.50

531

312

27.9

72.1

 

2Bt

440

0.41

2.60

84

199

315

2.86

604

387

33.9

66.1

 

C

1153

0.75

50.2

137

367

412

34.0

1001

934

45.2

54.8

90

A

209

0.70

6.56

98

48

150

2.01

306

183

18.9

81.1

 

BA

221

0.36

3.62

68

39

136

2.13

248

164

18.1

81.9

 

Bt1

178

0.46

2.75

64

29

120

3.22

220

159

16.2

83.8

 

Bt2

187

0.36

2.60

64

28

102

3.90

201

155

17.4

82.6

 

BC

156

0.49

3.35

61

28

59

3.39

156

142

22.8

77.2

100

A

458

0.65

6.36

79

64

170

3.51

324

309

23.2

76.8

 

AB

441

0.68

5.18

53

47

120

6.70

233

342

25.6

74.4

 

Bt1

269

0.33

2.77

44

62

113

2.09

225

187

30.1

69.9

 

Bt2

228

0.34

2.69

64

50

97

3.91

217

216

26.4

73.6

 

BC

202

0.35

3.01

58

31

59

5.54

157

169

25.4

74.6

170

A

320

0.42

19.5

36

83

188

5.25

332

292

32.5

67.5

 

Bt2

264

0.16

1.72

39

77

154

6.02

278

298

30.5

69.5

 

Bt2

287

0.27

1.92

39

85

151

6.59

284

314

33.0

67.0

 

Bt3

291

0.22

2.27

39

90

148

4.48

283

316

34.0

66.0

 

Bt4

314

0.02

2.40

38

88

177

5.30

310

387

30.9

69.1

 

C

597

0.28

12.2

53

111

172

12.0

360

653

37.6

62.4

190

A

518

0.59

10.2

81

83

336

2.70

514

266

18.8

81.1

 

Bt1

342

0.48

1.90

58

44

201

3.90

309

231

16.4

83.8

 

Bt2

353

0.43

1.40

62

64

220

8.15

356

286

20.6

79.4

 

Bt3

362

0.60

1.45

60

77

213

7.40

359

283

24.1

75.9

240

A

577

0.56

36.0

74

119

288

3.95

522

377

31.0

69.0

 

Bt1

234

0.24

3.22

26

37

103

7.19

176

270

27.0

73.0

 

Bt2

212

0.24

3.87

52

25

81

5.10

167

262

20.5

79.5

 

BC

138

0.24

2.46

54

27

69

6.61

164

229

22.4

76.0