2.4 Data calculations and statistics
The formula for calculating phytolith and PhytOC contents in plant
species were as follows:
phytolith content (g kg-1) = phytolith weight (g) /
dry biomass (kg) [1]
PhytOC content (g
kg-1) = PhytOC weight (g) / dry biomass (kg) [2]
The community weighted mean contents of phytolith
(PhytolithCWM) and phytOC (PhytOCCWM)
were also calculated using biomass as weight:
phytolithCWM (g
kg-1)=∑i phytolith
contenti (g
kg-1)×biomassi (%) [3]
PhytOCCWM (g
kg-1)=∑i PhytOC
contenti(gkg-1)×biomassi (%) [4]
where i enumerates each species.
PhytOC stock (kg ha-1)= PhytOCCWM (g
kg-1)×biomass (kg
ha-1)×10-3 [5]
PhytOC production flux (kg ha-1yr-1) = PhytOCCWM(gkg-1)×NPP (kg ha-1yr-1)×10-3 [6]
One-way ANOVA and Duncan’s multiple range test were performed to examine
the difference in phytolith and PhytOC contents among different parts of
plant species. SPSS 20.0 was used for all the statistics and Sigma Plot
12.0 was used for figures.