The lognormal curve fitting formula [27] used was:
Sð^RÞ ¼ S0e½aðRR0Þ2
The formula [28] for estimating the total number of species in
the community used was:
ST ¼ S0 ffipffiffiffi
p
=a
where Sð^RÞstands for the theoretical species number in the R-th log
interval, R for the log interval, S0 for the species number at the highest
point in the actual histogram (or actual curve) of the species
abundance distribution, R0 for the log interval corresponding to
the highest point in the actual histogram (or actual curve) and a
is determined according to both the determination coefficient (R2)
and the fitting effect for a theoretical curve in statistics.
The formula [29] for the determination coefficient (R2) is shown
as follows:
R2 ¼ 1
Pm
R¼0½SðRÞ Sð^RÞ
Pm
R¼0½SðRÞ SðRÞ
SðRÞ ¼
1
m þ 1
SðRÞ