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采用二维极点排序法定量地将不同地段的6个珙桐群落样地划分为3组，即碧峰沟上源珙桐群落、竹园沟珙桐群落以及石磨河上源珙桐群落。这3个组合与土壤湿度及厚度的梯度变化相一致，表明植物群落与环境密切相关。极点排序图直观地表明了这6个样地的生态分布，且反映出生境的梯度变化，排序图还可反映群落优势种在样地上的定量分布，表明植物种的生态适应性。
Two-dimensional pole-ordering method was used to quantitatively divide the four communities of Davidia involucrata in different locations into three groups, namely, the Davidia involucrata community in the Bifengdian area, the Davidia involucrata community in the Chukougou valley and the Davidia involucrata community in the Shimuhe River. These three combinations are consistent with the gradient of soil moisture and thickness, indicating that the plant community is closely related to the environment. The polar ordination diagram visually shows the ecological distribution of the six plots and reflects the gradient change of the habitat. The sorted plots can also reflect the quantitative distribution of the dominant species on the plots and indicate the ecological adaptability of the plant species.