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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