[Objective]The aim of the study was to study the relationship among rock plants on Jianglang mountain,and to provide a basis for resources protection and sustainable utilization.[Method]Based on the investigation,niche breadth,niche proportional similarity and niche over-lap values of 16 rock plants were calculated with Shannon-Wiener,Schoener and Pianka formulas.[Results]Neyraudia montana had the largest niche breadth (1.986),followed by Lycopus lucid-us (1.618),Peucedanum praeruptorum (1.560),Selaginella tamariscina (1.515),Commelina bengalensis (1.489),Pinellia cordata (1.477),Crotalaria sessiliflora (1.308),Briggsia chie-nii (1.236),Sedum emarginatum (1.199),Malaxis microtatantha (1.186),Millettia dielsiana (1.168),Pilea pumila (1.121 ),Pyrrosia lingua (1.057),Conandron ramondioides (1.015 ), Sedum drymarioides (0.910)and Saxifraga stolonifera (0.856 ).There were only 20 species pairs (16.7% of the total pairs)with Cih ≥0.5 by the calculation from Schoener.There were only 35 species pairs with Oih according to Pianka value,which accounted for 29.2% of the total pairs. The value of N .montana versus others ranged from 0.32 to 0.57 and from 0.29 to 0.82,respec-tively.[Conclusion]The similarity of resource requirement was low and the trend of niche differ-entiation existed in species.The dominant status of N .montana was obvious and other species did not affect it.%【目的】研究江郎山岩生植物种群间的相互关系，为该地岩生植物资源的保护和可持续利用提供依据。【方法】在调查的基础上，应用 Shannon-Wiener 公式、Schoener 公式和 Pianka 公式，对16个岩生植物种群的生态位宽度、生态位相似性比例和生态位重叠进行了计算和分析。【结果】生态位宽度最大的是山类芦（1．986），其他依次为地笋（1．618），前胡（1．560），卷柏（1．515），饭包草（1．489），滴水珠（1．477），野百合（1．308），浙皖粗筒苣苔（1．236），凹叶景天（1．199），小沼兰（1．186），香花崖豆藤（1．168），透茎冷水花（1．121），石韦（1．057），苦苣苔（1．015），大叶火焰草（0．910）和虎耳草（0．856）。Schoener 生态位相似性比例表明，Cih ≥0．5的种对仅有20个，占总对数的16．7％。Pianka 生态位重叠值表明，Oih ≥0．5的种对仅有35个，占总对数的29．2％。优势种山类芦与其他种的生态位相似性比例和生态位重叠分别在0．32～0．57和0．29～0．82之间。【结论】物种之间对资源的需求趋同性不高，对资源的偏向性和生态位分化趋势存在。山类芦在群落中的优势明显，其他种并不构成竞争威胁。
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