图5. 土壤因子组合对植物种群生物量(A)和群落多样性指数(B)的变差分解。小于0的数值未显示。单个圆圈内数字代表该土壤因子组合能解释的变差, 圆圈重合部分内数字代表几个土壤因子组合共同解释的变差。X₁组包括微生物生物量C含量、N含量、P含量、C:N、C:P和N:P; X₂组包括土壤有机C含量、全N含量、全P含量、C:N、C:P和N:P; X₃组包括土壤NO₃^--N浓度、NH₄⁺-N浓度和速效P浓度。

Fig. 5. Variation partitioning of plant population biomass (A) and community diversity index (B) by soil factor groups. Values < 0 not shown. Data in one circle represent the variation individually explained by the soil factor group, data in the overlapped part of circles represent the variation jointly explained by soil factor groups. X₁ group includes microbial biomass C content, N content, P content, C:N, C:P, and N:P; X₂ group includes soil organic C content, total N content, total P content, C:N, C:P, N:P; X₃ group includes soil NH₄⁺-N, NO₃^--N, and available P concentrations, respectively.