Note: SRL: specific root length; RTD: root tissue density; Significant difference *, P ≤ 0.05; **, P ≤ 0.01; ***, P ≤ 0.001; NS, not significant.
Table 4. Variance contribution rate (VCR) 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 six root traits for Stipa breviflora .