清凉峰自然保护区木荷种群结构研究
Population Structure of Schima superba in QingliangfengNational Nature Reserve
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摘要: 以位于浙江清凉峰国家级自然保护区1 hm2永久样地为研究材料,逐一测量并记录了样地中所有胸径≥1 cm树木的胸围,并对其挂牌标记、鉴定种名和确定坐标位置,分析了样地内木荷种群结构与空间格局。研究结果表明,DBH≤17.5 cm的木荷个体数量占80.5%,DBH>27.5 cm的仅占8.4%,种群能够实现自我更新,属稳定型种群。基于种群径级结构分析,木荷种群密度随个体胸径的变化趋势类似于偏正态分布形曲线。木荷在整个样地中的分布表现出明显的空间异质性,多数聚集于坡面和山脊的生境中。种群空间关联性分析表明,木荷大径级(DBH≥16.1 cm)和小径级(1 cm≤DBH＜16.1 cm)间在0-8 m的尺度上负相关,8-25 m的尺度上无关联。另外,25个小样地的木荷重要值为0-34.35%,平均重要值为8.24%,小样地间的这种巨大差异归因于木荷种群空间分布的聚集性。Abstract: The population structure and spatial distribution patterns of Schima superba on 1 hm2 permanent sample plot located at Qingliangfeng Nature Reserve were analyzed by measuring ,registering, tagging, identifying and mapping all the trees with DBH≥1 cm in the 1 hm2 permanent sample plot. The result indicated the percentage of Schima superba with DBH≤17.5 cm and DBH>27.5 cm was 80.5%, 8.4%. With self-renewal ability, the population was stable. Based on analysis of population size class structure, the trend of population density of Schima superba changing with individual DBH was similar to skew normal distribution. Possibly attributed to the choice of plot, Schima superba, distribution of which took on obvious spatial heterogeneity, mostly gathered at slope and ridge. The analysis of population spatial association indicated there was negative correlation between individuals with DBH≥16.1 cm and those with 1 cm≤DBH＜16.1 cm at scales≤8 m, and no correlation at larger scales. Importance values of Schima superba in 25 little plots were 0-34.35%, and the average was 8.24%. The great difference among little plots was due to aggregation of spatial distribution of Schima superba.
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Key words:
- Qingliangfeng
- / Schima superba
- / size class structure
- / spatial pattern
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