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. 2008 Jun 28;179(2):417–427. doi: 10.1111/j.1469-8137.2008.02476.x

Figure 6.

Figure 6

Interaction between leaf and root properties in the present study and in the two previous studies. Closed circles, data from the present study; open circles, data collected from studies by Poorter and co‐workers (Poorter & Remkes, 1990; Poorter et al., 1990, 1991); +, data collected from studies by Reich et al. (1998a,b). Bold lines represent regression lines for statistically significant relationships. Regression relationships – present study: specific leaf area (SLA), y = 224x + 26 (r 2 = 0.34, P = 0.035); leaf nitrogen productivity (LNP), y = 28.9x + 3.7 (r 2 = 0.49, P = 0.01); leaf : root ratio, y = 15.4x + 2.5 (r 2 = 0.12, P = 0.16); leaf nitrogen per area (LNCa), y = 0.028x + 1.55 (r 2 = 0, P = 0.92); net assimilation rate (NAR), y = 42.2x + 6.0 (r 2 = 0.36, P = 0.031); Poorter's study: SLA, y = 274x + 29 (r 2 = 0.55, P < 0.001); LNP, y = 43.7x + 8.3 (r 2 = 0.54, P < 0.001); leaf : root ratio, y = 17.7x + 1.2 (r 2 = 0.27, P = 0.006); LNCa, y = −5.32x + 1.62 (r 2 = 0.15, P = 0.037); NAR, y = 18.7x + 9.4 (r 2 = 0.023, P = 0.23); Reich's study: SLA, y = 1159x + 13 (r 2 = 0.82, P < 0.001); LNP, y = 227x + 2.6 (r 2 = 0.70, P < 0.001); leaf : root ratio, y = −9.64x + 3.002 (r 2 = 0.058, P = 0.53); LNCa, y = −22.8x + 1.4 (r 2 = 0.56, P = 0.013); NAR, y = 79.1x + 4.1 (r 2 = 0.31, P = 0.05).