德兴常绿阔叶林乔木层优势种群的生态位

基于对德兴常绿阔叶林的样地调查,采用定量分析的方法,测算了30种乔木层优势种群的生态位宽度和生态位重叠。结果表明:木荷、石栎、甜槠、丝栗栲种群的生态位宽度最大,而油茶、石楠由于在常绿阔叶林中环境适应性较差,仅能利用极其有限的资源,成为特化种,生态位宽度为0。生态位宽度较大的树种间生态位重叠较大,如木荷、石栎、甜槠等,生态位重叠值均在0.55以上。255个种对的生态位重叠值<0.2,占全部计算种对的58.6%,而>0.5的种对仅占7.4%,各树种间生态位的重叠程度不高,不同树种因利用相同的资源而产生的种间竞争并不激烈,这是树种间长期的竞争和适应的结果。

The ecological niche of dominant tree species in the evergreen broad-leave forest of Dexing city

Based on the plot investigation of evergreen broad-leave forests in Dexing city,the niche breadths and overlaps of thirty dominant species were measured by using a quantitative analysis method.The results showed that the largerest niche breadths were Schima superba,Lithocarpus glabra,Castanopsis eyrei and Castanopsis fargesii.However,Camellia oleifera and Photinia serrulata could only use very limited resources in the ambience of evergreen broad-leaved forests and developed to specialized species because of poor adaptability.Their niche breadths were 0.Species that niche breadths were larger had greater niche overlaps among them,such as Schima superba,Lithocarpus glabra and Castanopsis eyrei,etc.Their niche overlap values were all above 0.55.Niche overlap values of 255 species were less than 0.2,accounted for 58.6% of the total.But the species with more than 0.5 niche overlap values only took up 7.4% of the total.It was a long-term competition and adaptation among the species with small niche overlaps and weak competition,because they consumed the same resources.