[Objective]In this paper,the quantity characteristics of two typical epiphytic ferns,Neottopteris nidus and Pseudodrynaria coronans,were investigated to provide basic information for evaluating the characteristics of the two ferns and monitoring the biodiversity located in canopy. [Method]The primary forests ( PFs ) and degraded primary forests ( DPFs) were analyzed respectively using data from 16 plots,at which all the two nest ferns can be present. The two types of communities were compared of their elevation of distribution,size and density,and density of hosts,number of nest ferns on individual hosts. The Shapiro-Wilk method or distribution models of those measurements were fitted. The diffusion coefficient ( C) was calculated to decide hosts’distribution pattern. [Result]Average density of the two nest ferns in PFs was 111. 2 individual·hm -2 ,and in DPFs was 210. 6 individual·hm -2 . Average density of hosts in PFs and DPFs were 72. 8 and 117. 8 individual·hm -2 ,respectively. The sum of host species was 79 species which belong to 53 genera of 31 families. All the hosts are tree species except Tetrastigma planicaule,a vine of N. nidus could only be found on 25 host species and P. coronans was only present on 17 host species. There were 24 host species could only be found in PFs and 48 in DPFs. And 7 host species ( i. e. common host species) could be found in both types of plots. The height of the two nest ferns were in the range of 0. 5 25. 0 m,but 69. 5% of them lower than 10 m and 39. 7% of them in a height range of 5. 0 9. 0 m. Ferns size,ferns density,hosts density,and ferns on per host could be described well by negative exponential function. Hosts in PFs and DPFs were clumped distribution patterns. [Conclusion]In rain forests of the study region,the two nest epiphytic ferns tended to fasten on hosts in a height range of 5. 0 9. 0 m although they could be found in height range of 0. 5 25. 0 m,and they were in clumped distribution patterns in the horizontal direction. It was interesting that ferns size and density,hosts density and ferns on per host appeared an inverse“J”pattern together. To explore the reason why more of the two nest epiphytic ferns were present in DPFs than in PFs,it was recommended that the relations of their richness and abundance with forest community type,structure and microclimate should be analyzed next step.%【目的】研究吊罗山国家森林公园山地雨林中巢蕨和崖姜的数量特征，为这2种蕨的特征评价和冠层生物多样性监测提供依据。【方法】对出现巢状蕨的原始林和退化原始林的组成与结构特征做比较分析，通过检验或拟合分布函数，量化分析巢状蕨的分布高度、大小和密度，以及寄主的密度、单个寄主上的巢状蕨数量，用扩散系数和 t－检验方法判断寄主在群落中的分布格局。【结果】在退化原始林和原始林中，巢状蕨的平均密度分别为210.6和111.2株·hm －2，寄主的平均密度分别为117.8和72.8株·hm －2；寄主有79种，分属31科、53属，除1种是藤本植物外，其余均为乔木树种；只出现巢蕨的有25种，只出现崖姜的有17种，同时出现巢蕨和崖姜的寄主有37种；只出现在退化原始林中的寄主有48种，只出现在原始林中的有24种，2种森林类型中都出现的有7种；从寄主基部0.5 m到树冠层25.0 m的高度范围均有巢蕨和崖姜分布，低于10 m的占69.5%，出现在5.0～9.0 m 的占39.7%；巢蕨和崖姜的直径分布和密度分布以及寄主的密度分布和单株寄主上的数量分布均可用负指数函数描述；寄主在群落中呈集群分布。【结论】巢状蕨主要出现在寄主基部到10.0 m 的位置，5.0～9.0 m 尤为集中；在林内水平方向，寄主呈集群分布；巢状蕨的直径与密度分布以及寄主密度、单个寄主上巢状蕨的数量分布均呈反“J”型；山地雨林中寄主植物物种丰富，未表现出明显的寄主专一性；退化原始林中的巢状蕨多于原始林，寄主的丰富度和多度亦是如此；为揭示成因，需进一步研究森林群落类型、结构、小气候等与附生蕨的丰富度和多度关系。
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