云南富源光皮桦种群与主要伴生树种生态位研究

运用Levins和Shannon-Wiener生态位宽度指数,对云南富源县光皮桦种群及其主要伴生树种的生态位进行了研究。结果表明:光皮桦生态位宽度最大,杉木、华山松次之,其他主要伴生树种的生态位宽度均较小,表明光皮桦对环境具有广泛的适应性,在群落中优势地位明显。光皮桦与杉木、华山松的生态位相似性比例较大,对资源有共享趋势;光皮桦与其他树种的生态位相似性比例较小。光皮桦群落中主要树种间的生态位重叠较低,表明主要树种间生态位分化程度较高,种间竞争关系较弱。

Study on Niche of Betula luminifera Population and Its Main Associated Tree Species in Fuyuan, Yunnan

Using Levins and Shannon-Wiener niche breadth index,the niche of Betula luminifera population and its main associated tree species in Fuyuan County,Yunnan was studied.The results showed that B.luminifera had the biggest niche breadth.The niche breadth of Cunninghamia lanceolata,Pinus armandi ranks second.The niche breadth of other associated tree species was smallest.It indicates that B.luminifera has extensive adaptation to environment and it is the dominant species in the community.The niche proportional similarity between B.luminifera and C.lanceolata,P.armandi was larger,showing that B.luminifera and C.lanceolata,P.armandi had greater resource-sharing degree.But the niche proportional similarity between B.luminifera and most of other associated tree species were small.The niche overlap between most of tree species in B.luminifera community were smaller,which indicated a higher niche polarization of main tree species and a weaker competition in B.luminifera community.