Fig. 3
From: Testing allometric scaling relationships in plant roots
SMA results of the relationship between plant fine root productivity (P) and biomass (M) among ecosystems. Values are log-transformed (base 10). The lines show the fitted regression equations for boreal forests: log10P = 0.082 + 1.00 × log10M (95% C.I. for slope is 0.83 to 1.14, r2 = 0.24, n = 184); temperate forests: log10P = − 0.036 + 0.93 × log10M (95% C.I. for slope is 0.85 to 1.02, r2 = 0.51, n = 254); subtropical forests: log10P = − 0.125 + 1.11 × log10M (95% C.I. for slope is 0.96 to 1.29, r2 = 0.43, n = 101); tropical forests: log10P = − 0.131 + 1.08 × log10M (95% C.I. for slope is 0.92 to 1.26, r2 = 0.29, n = 118); temperate grasslands: log10P = − 0.279 + 0.94 × log10M (95% C.I. for slope is 0.78 to 1.13, r2 = 0.59, n = 50); tropical grasslands: log10P = 0.166 + 0.73 × log10M (95% C.I. for slope is 0.42 to 1.28, r2 = 0.29, n = 12); tundra: log10P = − 0.085 + 0.94 × log10M (95% C.I. for slope is 0.77 to 1.15, r2 = 0.88, n = 16); wetlands: log10P = − 0.149 + 1.03 × log10M (95% C.I. for slope is 0.94 to 1.12, r2 = 0.84, n = 91). The short dash lines refer to the 95% confidence intervals. The pink line refers to the 1:1 line