图4. 油松人工林火烧迹地早期土壤结构性质对入渗性的作用。实线和虚线分别表示达到显著水平的正负作用(p < 0.05), 未达显著水平的作用不显示。线条粗细表示作用大小, 数值表示直接路径系数, 即标准化的回归系数(β)。R²为模型对土壤入渗的解释能力。Aggr, 团聚体; BD, 容重; CIV, 入渗总量; CMC, 毛管持水量; FMC, 田间持水量; IIR, 初渗速率; IWC, 初始含水率; MC, 持水量; NCP, 非毛管孔隙度; OMC, 有机质含量; Por, 孔隙度; SHC, 饱和导水率; SIR, 稳渗速率; SMC, 饱和持水量; TP, 总孔隙度。

Fig. 4. Effects of soil structural properties on infiltrability in the early period of a post-fire Pinus tabulaeformis plantation. Solid and dashed arrows indicate positive and negative effects at significant level (p < 0.05), respectively. Non-significant effects are not shown. The thickness of the line indicates the effect size. Values associated represent direct path coefficients (β). R² values indicate the ability of the model to explain soil infiltration. Aggr, aggregate; BD, bulk density; CIV, cumulative-infiltration volume; CMC, capillary moisture capacity; FMC, field moisture capacity; IIR, initial infiltration rate; IWC, initial water content; MC, moisture capacity; NCP, non-capillary porosity; OMC, organic matter content; Por, porosity; SHC, saturated hydraulic conductivity; SIR, steady infiltration rate; SMC, saturation moisture capacity; TP, total porosity.