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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