Table 2 Sampling error (E%) according to the different sampling procedures for each plot size and sampling intensity tested
From: Sampling methods for titica vine (Heteropsis spp.) inventory in a tropical forest
Process sampling | Sampling intensity (%) | Plot (m × m)/area (m2) | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
10 × 25 | 15 × 20 | 10 × 30 | 20 × 25 | 40 × 15 | 20 × 30 | 30 × 30 | 6 × 150 | 10 × 100 | 10 × 150 | 20 × 150 | ||
250 | 300 | 300 | 500 | 600 | 600 | 900 | 900 | 1000 | 1500 | 3000 | ||
Random | 5 | 24.889 | 27.780 | 27.629 | 28.272 | 29.221 | 31.79 | 32.636 | 35.115 | 27.963 | 37.931 | 37.931 |
10 | 18.309 | 19.265 | 18.638 | 20.772 | 21.616 | 23.421 | 24.06 | 21.28 | 23.513 | 27.236 | 27.236 | |
15 | 15.439 | 15.609 | 16.05 | 17.687 | 18.022 | 18.504 | 19.161 | 19.619 | 18.809 | 24.658 | 24.658 | |
20 | 13.222 | 13.443 | 13.708 | 15.113 | 15.924 | 15.589 | 16.937 | 17.652 | 16.432 | 20.847 | 20.847 | |
Systematic | 5 | 20.184 | 24.034 | 24.47 | 24.303 | 26.887 | 28.147 | 31.099 | 37.303 | 34.347 | 46.011 | 23.260 |
10 | 15.881 | 17.433 | 17.538 | 16.117 | 18.044 | 18.583 | 20.453 | 29.998 | 27.994 | 31.526 | 20.297 | |
15 | 12.435 | 13.876 | 14.368 | 14.951 | 14.58 | 16.101 | 16.708 | 23.009 | 23.71 | 26.153 | 33.919 | |
20 | 10.708 | 11.980 | 12.530 | 12.346 | 12.501 | 13.605 | 14.394 | 20.256 | 19.313 | 24.195 | 31.431 | |