安曹下76年生杉木林主要植物种群生态位宽度

Niche Breadth of Main Plant Species in A 76-year-old Chinese Fir Community in Ancaoxia,Fujian

通过2400m2标准地调查,采用不同取样尺度对福建南平安曹下76年生老龄杉木林下植物群落不同层片的主要种群的生态位宽度进行了测定,结果表明:76年生老龄杉木群落多数主要种群的生态位较宽,而只有少数主要种群为窄生态位的;老龄杉木群落中丝栗栲、美秀栲、绒楠、青冈、五月茶等乔木种类生态位宽度值较大,有向常绿阔叶林演替的趋势。均匀分布的种群,取样尺度越大,则生态位宽度值越大。

The niche breadth of main species in different synusia of a 76-year-old Chinese fir community in Ancaoxia,Fujian,China,were studied by different sampling scale based on the data collected from sample plots with an area of 2 400 m^2.The results showed that most of the main species in the old-growth Chinese fir community had broad niche breadth,only few main species had narrow niche breadth.The old-growth Chinese fir community,with broader niche breadth of evergreen broadleaved tree species;Castanopsis fargesii,Castanopsis jucunda,Machilus velutina,Cyclobalanopsis glauca and Antidesma gracil,would be replaced by evergreen broadleaved forest community.The niche breadth of the species with uniform distribution increased with increasing sampling scale.