Figure 1. Generic homeostatic regulation of soil elements assimilated by microbes (fractional control represents condition when microbial element is exactly certain fraction of soil elements; homeostatic regulation represents microbial regulation of its element through assimilation; strict homeostasis indicates condition when microbial element concentrations are completely independent of soil element concentration; the three scenarios based on Log(Y) = a × Log(X) + b are, a = 1, b < 0 for fractional control, 0 < a < 1, b ≠ 0 for homeostatic regulation, a = 0, b > 0 for strict homeostasis; notice the axis in this figure are not log-transformed which is different from the Eqs. 1 & 2).