太阳河自然保护区西南桦天然次生林乔木种群生态位分析

摘要

采用种群重要值、生态位宽度和生态位重叠等研究方法,对云南省太阳河自然保护区的西南桦天然次生林进行群落的物种组成以及种群间的相互关系的研究.结果表明,西南桦和红木荷在群落中的优势地位明显,重要值分别是16.87%和15.17%;生态位宽度排前5位的物种分别是红木荷、西南桦、岗柃、红皮水锦树和截头石栎.西南桦天然次生林种群重要值与生态位宽度之间存在极显著的正相关,且可用Growth函数表示;生态位宽度大的种群间生态位重叠值也往往较大,西南桦与其它种群之间的生态位重叠值大于0.8的有6个,显示出西南桦种群与其它种群间存在较强的资源利用性竞争.%For analyzing the species composition and interspecific association of tree populations of Betula alnoides natural secondery forest in Taiyanghe Nature Reserve in Yunnan province,study methods such as importance value,niche breadth and niche overlap were used.The results showed that Betula alnoides and Schima wallichii were dominant species and corresponding importance values were 16.87% and 15.17%.Niche breadth of Betula alnoides,Schima wallichii,Eurya groffii,Wendlandia tinctoria ssp.intermedia and Lithocarpus truncatus populations were larger than other populations.There was a significant positive correlation between importance value and niche breadth and the model was Growth function.Simultaneously,niche breadth increased with niche overlap in the Betula alnoides primary forest.Niche overlap exceeded 0.8 had 6 species pairs between Betula alnoides and other populations which means that Betula alnoides population had a stronger resource utilization competition.