缙云山草珊瑚群落主要种群生态位研究

A Study on the Niches of Main Species in Communities with Sarcandra glabra Populated in Mt.Jinyun

分析了缙云山草珊瑚群落20个物种的生态位特征.研究表明:①草珊瑚群落主要物种生态位宽度值大小依次为草珊瑚、狗脊、红盖鳞毛蕨、杜茎山、山黄皮、茶、马尾松、四川山矾、四川大头茶、芒萁、里白、杉木、重楼排草、川杨桐、白毛新木姜子、细枝柃、薯豆,而广东钓樟、短刺米槠以及香樟生态位宽度值相同且最小;②草珊瑚与短刺米槠、重楼排草生态位重叠值较大,存在着较激烈的竞争;③物种间的生态位重叠值与它们的生态位宽度大小并没有明显的正相关,生态位宽度小的物种之间也可能存在较大的生态位重叠.

The niche characteristics of the 12 species in Sarcandra glabra communities were analyzed in Mt. Jinyun. The results showed that： 1） The niche breadths of the main species in communities with Sarcandra glabra populated decreased following the order of Sarcandra glabra, Woodwardia japonica, Dryopteris erythrosora , Maesa japonica, Randia cochinchinensis , Camellia sinensis , Pinus rnassoniana , Syrnplocos setchuanensis, Gordonia acuminata , Dicranopteris dichotoma , Hicriopteris glauca , Cunning- harnia laceolata , L ysirnachia paridi forrnais , Adinandra bockiana , Neolitsea aurata var. glauca , Eurya loquiana and Elaeocarpus japonicus. The niches breadths of the other three species （Lindera kwangiungensis, Castanopsis carlesii vat. spinulosa, and Cinnamonum carnphora） are the same and the minimal; 2） Niche overlaps of Sarcandra glabra with Castanopsis carlesii var. spinulosa and Lysirnachia paridiforrnais were notable, indicating that considerable competition occurred among the three species; 3） Niche overlaps between species were not significantly correlated with their niche breadths. Niche overlaps may be notable between two species which have lower niche breadths.