浙江六十田常绿阔叶林主要乔木种生态位研究

应用Shannon-Wiener生态位宽度指数、生态位相似性比例系数及生态位重叠指数,对浙江省六十田省级自然保护小区常绿阔叶林群落中主要乔木树种的生态位特征进行了研究.结果表明:红楠Machilus thunbergii、华东楠Machilus leptophylla、青冈Cyclobalanopsis glauca、紫楠Phoebe sheareri、木荷Schima superba、东南石栎Lithocarpus harlandii具有较大的生态位宽度,分别为0.969、0.951、0.898、0.867、0.819和0.773,而香槐Cladrastis wilsonii、树参Dendropanax dentiger、枫香Liquidambar formosana的生态位较小,仅为0.345、0.245和0.245;生态位宽度大的树种间一般有较高的生态位相似性比例;香槐、树参和枫香的生态位宽度较小,但与其它树种的相似性却很高,表明这些树种对资源有较明显的共享趋势;从生态位重叠值来看,整体上表现为生态位宽度较大的树种间都有较高的生态位重叠,生态位宽度较小的树种与其它树种的生态位重叠较小.

Niche of Dominant Species in Evergreen Broadleaved Forest in Liushitian Mini Nature Reserve of Zhejiang Province

The niche breadth,similarity and overlap of 17 dominant arbor populations in the evergreen broadleaved forest in Liushitian Mini Nature Reserve of Zhejiang Province were studied.The results show that the niche breadths of Phoebe sheareri,Machilus leptophylla,Cyclobalanopsis glauca,Machilus thunbergii,Schima superba and Lithocarpus harlandii are rather large with their breath values being respectively 0.969,0.951,0.898,0.867,0.819 and 0.773;and that those of Cladrastis wilsonii,Dendropanax dentiger and Liquidambar formosana are rather small with their breadth values being only 0.345,0.245 and 0.245,respectively.The niche similarity between the species with broad niche breadths is greater than that with narrow niche breadths.In addition,the species with small niche breadths such as Cladrastis wilsonii,Dendropanax dentiger and Liquidambar formosana,also have great similarity with other species.The results also show that these species have an obvious resource-sharing tendency;and that the niche overlap between the species with broad niche breadths is great and the small niche-breadth species have small niche overlap with other species.