654672.fig.002
Figure 2: Species (s) versus area (A) relationship (black) is a cumulative curve of nonequilibrium stationary-state distribution of chemical energy in an ecosystem. The total amount of base constituents N in the system is taken proportional to the area A. The cumulative curve follows mostly the power law (green) but at large areas the logistic form (blue) accounts better for the statistical series. The units on axes depend on the energetics given by γ, units of measurements, and proportionality constants.