关键词: 岩生植物, 生态位宽度, 生态位相似性比例, 生态位重叠

Abstract: [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 overlap 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 lucidus (1.618), Peucedanum praeruptorum (1.560), Selaginella tamariscina (1.515), Commelina bengalensis (1.489), Pinellia cordata (1.477), Crotalaria sessiliflora (1.308), Briggsia chienii (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 C_ih≥0.5 by the calculation from Schoener. There were only 35 species pairs with O_ih 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, respectively. [Conclusion] The similarity of resource requirement was low and the trend of niche differentiation existed in species. The dominant status of N. montana was obvious and other species did not affect it.

Key words: rock plant, niche breadth, niche proportional similarity, niche overlap