天然柳杉群落主要种群生态位特征

摘要

研究天宝岩国家自然保护区天然柳杉群落中12个主要种群生态位,利用生态位宽度、生态位重叠值等相关指标对生态位等方面特征进行研究分析.结果表明,天宝岩国家自然保护区天然柳杉群落中,占大多数的主要是广生态位种群,狭生态位型物种相对较少些.生态位宽度较大的4种物种为柳杉＞闽粤栲＞细叶青冈＞甜槠,群落内部其他物种之间的生态位重叠度也比较大,说明群落中很可能存在较大种间竞争,可以考虑采用人为因素进行干扰.从柳杉种群来看,柳杉的生态位宽度最大,与木荷的生态位重叠最大.%Niche characteristics of 12 major populations of natural Cryptromeria fortunei forest in Tianbaoyan National Nature Reserve were analyzed by quantitative method. The niche characteristics include niche breadth and niche overlap. The results showed that most of the populations investigated in the natural Cryptromeria fortunei forest had wide niche, and the populations with narrow niche relatively less. Hie first four populations with the wider niche were Cryptromeria fortunei > Castanopsis fissa > Cyclobalanopsit gracilis > Castanopsis eyrei. Hie niche overlap of the 12 dominant species were comparably big, which indicated that the intra species competition was very serious in the community investigated. From the niche characteristics of Cryptromeria fortunei population, it can be seen that Cryptromeria fortunei had the widest niche breadth, and also had the biggest niche overlap with Schima superba.