Figure 6. Relationships of root mass fraction (RMF) with maximum root
depth (MRD), Root diameter (RD), Specific root length (SRL), specific
root area (SRA), Root tissue density (RTD) and Topological index(TI).*
indicates P <0.05, ** indicates P <0.01,
and *** indicates P <0.001. Standardised major axis
(SMA) regressions were fitted to the data.