2.4 Clonal diversity analysis
Clone diversity was estimated using the total genet number (G ), average clone size (N /G ), Simpson index (D ), and Fager index (E ). The calculation formulas of the Simpson and Fager indices were: D = 1-∑{[N i(N i-1)] /[N (N -1)]}; E = (D-D min) / (D max -D min); D min= (G -1) (2N -G ) /N (N -1);D max = (G -1) N /G (N-1). Where, N = ΣN i was the total number of sampled individuals (ramets), G was the total number of genotypes (genets), and N i was the number of individuals (ramets) with the i genotype.