Notes: N1 = 15 mg N/kg, N2 = 120 mg N/kg; P1 = 2 mg P2O5/kg, P2 = 24 mg P2O5/kg; W1 = 25% FMC (Field moisture capacity), W2 = 75% FMC; C1 = individual with single ramet; C2 = individual with three ramets.
Table 3. The analysis of variance of the effects of nitrogen addition (N), phosphorus addition (P), water addition (W) and their interactions (N×P, N×W and P×W), and cluster fragmentation (C) on seven root traits for Stipa breviflora .