Root morphological traits and root biomass respond to nutrient addition
N2 addition (120 mg N/kg) had negative effects on root growth by decreasing TRL, RSA, RV and RT (P ≤ 0.05, Figure 4A-C) as compared to N1 addition (15 mg N/kg). P2 addition (24 mg P2O5/kg) significantly promoted root growth via increasing RSA, RV and RT as compared to P1 addition (2 mg P2O5/kg) (P ≤ 0.05, Figure 5A-C).