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Table 1 Number of initially positive plots (among the 40 initial random plots per zone), added positive plots, added negative plots (from ACS), and individual trees≥6cm of the three target species. Means and standard deviations of DBH and tree density (trees≥6cm∙ha−1) were determined by the Hansen-Hurwitz estimator

From: Fujian cypress and two other threatened tree species in three conservation zones of a nature reserve in north-western Vietnam

 

Conservation zone

Initial positive plots

Added positive plots

Added negative plots

Detected individuals (tree≥6cm)

Density (n∙ha−1)

DBH (cm)

Initial

Added

Total

F. hodginsii

Core

5

13

31

11

36

47

4.9 ± 2.5

16.9 ± 11.2

Buffer

2

1

4

4

1

5

1.9 ± 1.3

29.2 ± 13.4

Restoration

1

0

4

1

0

1

0.6 ± 0.6

8.3 ± NA

A. spectabilis

Core

8

37

53

12

62

74

5.1 ± 2.2

17.3 ± 10.1

Buffer

1

0

4

1

0

1

0.6 ± 0.6

12.7 ± NA

Restoration

1

1

6

1

1

2

0.6 ± 0.6

16.6 ± 14.4

Q. platycalyx

Core

7

6

38

7

6

13

4.4 ± 1.2

27.8 ± 18.8

Buffer

6

8

31

7

11

18

4.9 ± 2

22.4 ± 15.3

Restoration

4

1

18

29

1

30

16.6 ± 8

17.3 ± 5.5

  1. NA not available