Table 6 Definition of five ratios contrasting tree species diversity in the regeneration and overstory layers
From: Tree regeneration characteristics in limestone forests of the Cat Ba National Park, Vietnam
Ratio | Function | Explanation |
|---|---|---|
Species richness ratio (SRR) | Nr/ No | Nr, number of species in the regeneration layer per sample plot No, number of species in the overstory layer in the same sample plot |
True diversity ratio (TDR) | Tr/To | Tr, true diversity of the regeneration layer per sample plot To, true diversity of the overstory layer in the same sample plot |
Same species ratio (SSR) | Sr/No | Sr, number of regeneration species present in the overstory layer per sample plot No, see above |
Newly occurred species ratio (NSR) | Nn/No | Nn, number of species occurring in the regeneration layer but not in the overstory layer of a sample plot No, see above |
Threatened species ratio (TSR) | Rr/Ro | Rr, number of threatened tree species in the regeneration layer per sample plot Ro, number of threatened tree species in the overstory layer in the same sample plot |