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本文应用分形理论和方法比较分析了濒危种裂叶沙参与广布种泡沙参种群的空间分布格局及其分形特征。裂叶沙参与泡沙参种群在不同海拔区域分布格局的计盒维数与其在群落中占据空间的能力成正比，并且与环境因素密切相关。在裂叶沙参与泡沙参种群较为适生的区域，海拔２７００～３１００ｍ，两者在群落中占据空间的能力最强，他们的计盒维数达到最高。在低于海拔２７００ｍ或高于海拔３１００ｍ，环境条件严酷的区域，裂叶沙参种群与泡沙参种群占据空间的能力不同程度的下降。在不同的海拔区域，广布种泡沙参种群占据空间的能力均比裂叶沙参种群高，而其受环境因素影响较弱。在海拔２７００ｍ以下地区，泡沙参种群水平分布格局的计盒维数比裂叶沙参种群高４５倍；在两种群较为适生的区域，海拔２７００～３１００ｍ，泡沙参计盒维数比裂叶沙参种群高１５倍，差异最小；在泡沙参与裂叶沙参种群分布的上限，海拔３１００ｍ以上地区，两者计盒维数差异又增加，泡沙参计盒维数比裂叶沙参种群高１８倍。这说明裂叶沙参种群的内在适应力、竞争力比泡沙参种群相对较弱。
In this paper, the fractal theory and methods are used to compare and analyze the spatial distribution pattern and fractal characteristics of the endangered species, fissured sand, in the widely distributed species of Paeonia variabilis. The box-counting dimension of the fragmentation of sand-leaf sand participating in the population distribution at different altitudes is directly proportional to its ability to occupy space in the community, and is closely related to environmental factors. In the area where the fissured sand is involved in the adaptation of the Paphiea ginseng population, the altitude is 2700-3100m. Both of them have the strongest ability to occupy space in the community, and their box-counting dimension is the highest. In areas where the environmental conditions are less than 2700m above sea level or 3100m above sea level, the ability of the population of Alisma alba and Paphiopedilum to take up space is reduced to varying degrees. At different altitudes, the population of the broadly-dispersed Pamphlet was higher than the population of the Alisma alba, and it was less affected by environmental factors. In the area below 2700 m above sea level, the box-counting dimension of the horizontal distribution pattern of Paphiopedilum giraldii population is 4 5 times higher than that of the population of Alnus pilosa, and in the more suitable areas of the two groups, the altitude is 2700-3100 m. The number is 15 times higher than that of the population of Alnus striata, and the difference is the smallest. In the area where Paosha participates in the upper limit of the population distribution of Alisporium, the difference in box-counting dimensions between the two areas is increased again. The number is 1 8 times higher than that of the population of the schizophyllum. This shows that the intrinsic resilience and competitiveness of the population of the Alisma speciosa is relatively weaker than that of the Paeonia ginseng population.