Figure 3.

Relationship of leaf N (N_L) and leaf P (P_L) to specific leaf area and net photosynthetic capacity (A_mass) for all angiosperm data pooled. (a) For leaf N (N_L) and (b) leaf P (P_L), the relationships to specific leaf area (SLA) were log N_L = −0.326 + 0.759 (log SLA); n = 1819, r² = 0.54, p < 0.0001; and log P_L = −2.28 + 1.141 (log SLA); n = 1819, r² = 0.45; p < 0.0001. Statistics for specific leaf area relations for subgroups and biomes are listed in table 2. (c) For leaf N (N_L) and (d) leaf P (P_L), the relationships to net photosynthetic capacity were log N_L = −0.090 + 0.681 (log A_mass); n = 391, r² = 0.37, p < 0.0001; and log P_L = −2.21 + 1.131 (log A_mass); n = 391, r² = 0.30; p < 0.0001.