Table 3 Effect of N addition on the specific root area (SRA) and specific leaf area (SLA) ratios of root/leaf, the first- and second-order roots/leaves, and third- and above order roots/leaves of P. tabuliformis (mean ± SE, n = 5)
Biomass ratio | N treatment (g N kg−1) | |||||
|---|---|---|---|---|---|---|
N1 (0.02) | N2 (0.04) | N3 (0.08) | N4 (0.16) | N5 (0.32) | CK (control) | |
SRA/SLA | 37.5 ± 6.8 ab | 29.6 ± 4.5 b | 33.5 ± 5.0 ab | 30.6 ± 3.5 b | 26.3 ± 5.7 b | 49.3 ± 6.6 a |
First- and second-order SRA/SLA | 32.3 ± 6.4 ab | 23.2 ± 4.6 b | 27.2 ± 4.0 ab | 25.2 ± 2.7 ab | 22.2 ± 4.9 b | 40.7 ± 6.7 a |
Third to sixth-order SRA/SLA | 5.3 ± 0.6 ab | 6.4 ± 2.2 ab | 6.3 ± 1.1 ab | 5.5 ± 1.3 ab | 4.1 ± 0.9 b | 8.6 ± 1.5 a |