Root morphological traits and root biomass respond to the interaction between water and nutrients
The N × W had significant effects on SRL (Table 3). Under the drought condition of 25 % FMC water addition, the SRL was significantly lower in the 15 mg N/kg addition than that in the 120 mg N/kg addition, while there were no variations of the SRL between two-level nitrogen additions under well – watered condition (75 % FMC water addition) (P< 0.001, Figure 6A). Besides, the P × W also had significant effects on SRL (Table 3), which showed that water addition had no effect on SRL under the condition of 2 mg P2O5/kg addition (P1), but under higher phosphorus condition with 24 mg P2O5/kg (P2), the SRL was significantly higher under drought condition (W1) than that under well-watered condition (W2) (P ≤ 0.05, Figure 6B).