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Table 1 Mean and standard error for 14 soil variables from rhizosphere soil in the soil A horizon (0–10 cm depth) for 300 soil samples (150 per forest type) collected during root excavation in the Jianfengling Forest Reserve, Hainan Island, China, during summer 2017

From: Morphological variation of fine root systems and leaves in primary and secondary tropical forests of Hainan Island, China

Transect area

Soil quality

Total soil nutrients

Available soil nutrients

Soil cations

Soil texture

pH (in water)

Organic matter (g kg−1)

N (g kg−1)

P (g kg−1)

K (g kg−1)

N (mg kg−1)

P (mg kg−1)

K (cmol kg−1)

TEB (cmol kg−1)

ECEC (cmol kg−1)

BS (%)

% sand (0.5–2 mm)

% silt (0.002–0.5 mm)

% clay (< 0.002 mm)

Primary forest (n = 150)

4.27 ± 0.02

36.80 ± 1.45

1.39 ± 0.04

0.11 ± < 0.01

15.40 ± 0.70

186.56 ± 5.71

1.32 ± 0.08

0.19 ± 0.01

0.64 ± 0.03

8.60 ± 0.27

8.31 ± 0.41

73.01 ± 0.50

20.65 ± 0.38

6.34 ± 0.19

Secondary forest (n = 150)

4.39 ± 0.02

36.56 ± 1.28

1.42 ± 0.04

0.13 ± < 0.01

19.89 ± 0.98

176.38 ± 4.12

1.58 ± 0.19

0.26 ± 0.01

1.28 ± 0.10

9.78 ± 0.21

13.94 ± 1.12

67.06 ± 0.55

24.63 ± 0.38

8.31 ± 0.25

  1. Abbreviations: TEB total exchangeable bases, ECEC effective cation exchange capacity, BS base saturation