3.1 Trade-off among P. australis traits
The P. australis height traits had obvious positive correlations with the growth traits of leaf and stem, such as SLA (P<0.01), leaf area (P<0.01), pitch number (P<0.01), internode height (P<0.01), and shoot basal diameter (P<0.01). The SPAD and leaf thickness had significant negative correlations with other traits (Table 1).
Table 1. Trade-off among P. australis traits.