Table 2 Results of the curve estimation of the relationship
between water additions and total biomass, aboveground biomass,
belowground biomass and R: S ratio (i.e. the ratio of aboveground
biomass and belowground biomass) of species Stipa grandis with
linear, quadratic, power and exponential equations, where
R2, F, Df1, Df2, significance, constant, b1 and b2
were showed. A larger R2 with a significant value is a
better estimation, which is marked in red