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Table 2 Applied parameters of the vulnerability index

From: Local perception of ecosystem services and their conservation in Sudanian savannas of Burkina Faso (West Africa)

Parameters 1 (Low scale) 2 (Average scale) 3 (High scale)
Use frequency (N1) N1 < 20% 20% ≤ N1 < 60% N1 ≥ 60%
Number of uses (N2) N2 < 2 2 ≤ N2 ≤ 4 N2 ≥ 5
Plant parts used (N3) Leaves, latex Fruits, branches Wood, seeds, bark, roots, flowers
Biotope of plant (N4) Ruderal, gardens, field Secondary forest Primary or undisturbed forest
Collection mode (N5) Collection on the ground   Collection on the tree, cutting
Development stage (N6) Old, senescent Adult Young
Relative frequency in the environment (N7) Rf ≥ 2/3 Fm 1/3 Fm ≤ Rf < 2/3 Fm Rf < 1/3 Fm
  1. Rf, relative frequency; Fm, maximum frequency