Table 3 Number of individuals, species number (S), Shannon–Wiener index (H′), and species evenness (E) of dominant plant species (for both understory trees <1.2 m height and all plants) and the number of stems/relative density (in percent) in the 1 m × 1 m quadrats in an EBLF in Okinawa

Number of individuals

63

88

63

64

278

67

69

63

55

254

Species number (S)

20

30

21

15

44

29

24

34

25

56

Shannon–Wiener index (H′)

4.04

4.30

4.00

3.10

4.60

4.40

3.90

4.70

4.10

5.00

Species evenness (E)

0.93

0.88

0.91

0.79

0.84

0.91

0.85

0.92

0.88

0.86

  Adinandra ryukyuensis

5/7.9

5/2.0

  Ardisia quinquegona

4/6.3

8/9.1

8/12.7

4/6.3

24/8.6

8/11.9

11/15.9

9/14.3

6/10.9

34/13.4

  Camellia japonica

5/7.9

5/1.8

3/4.5

1/1.6

4/1.6

  Cinnamomum pseudo-pedunculatum

1/1.1

5/7.9

2/3.1

8/2.9

1/1.6

1/0.4

  Eurya japonica

3/4.5

1/1.4

4/6.3

8/3.1

  Glochidion acuminatum

2/2.3

2/0.7

6/9.0

5/7.2

2/3.2

2/3.6

15/5.9

  Neolitsea aciculata

1/1.4

2/3.2

3/5.5

6/2.4

  Persea thunbergii

4/4.5

2/3.1

6/2.2

2/2.9

3/5.5

5/2.0

  Rapanea neriifolia

3/4.8

2/2.3

4/6.3

9/3.2

7/10.4

6/8.7

2/3.2

1/1.8

16/6.3

  Schima wallichii

6/9.0

3/4.8

1/1.8

10/3.9

  Tarenna gracilipes

5/7.9

3/3.4

1/1.6

9/3.2

  Alpinia intermedia

5/7.9

9/10.2

5/7.9

8/12.5

27/9.7

4/6.0

2/2.9

1/1.9

10/18.2

17/6.7

  Diplazium donianum

6/9.5

6/2.2

1/1.5

1/0.4

  Dryopteris sordidipes

8/14.5

8/3.1

  Microlepia marginata

24/37.5

24/8.6

  Psychotria serpens

7/11.1

5/5.7

9/14.3

5/7.8

26/9.4

4/6.0

15/21.7

2/3.2

2/3.6

23/9.1

  Smilax bracteata

6/9.5

16/18.2

5/7.9

4/6.3

31/11.2

2/3.2

1/1.8

3/1.2

  Trachelospermum asiaticum

1/1.1

6/9.4

7/2.5

2/3.0

5/7.2

1/1.6

8/3.1

  Tylophora japonica

6/6.8

6/9.5

12/4.3

1/1.6

1/0.4

Unknown species

4/6.3

7/8.0

4/6.3

2/3.1

17/6.1