作　　者： ; ; (彭玉华）; (何琴飞）; (黄小荣）;

机构地区： 广西壮族自治区林业科学研究院

出　　处： 《应用生态学报》 2013年第9期2440-2446,共7页

摘　　要： 分析了桂西南喀斯特山地蚬木幼龄植株的结构特征、空间分布格局和生长动态,以及影响其种群更新的环境因子.结果表明:该区域的幼龄蚬木种群为稳定型,种群空间分布格局呈集群型分布;幼龄植株的地径和株高生长趋势相同,且地径随株高的增长而增加,实生苗的地径和株高生长受到种群密度的抑制;群落乔木和灌木层对蚬木幼龄植株的更新有重要影响,而草本层的影响不显著;岩石裸露率对蚬木天然更新未产生显著影响,不同坡度、坡位上蚬木幼龄植株的株高和地径的差异极显著,不同坡向植株的密度、株高和地径差异极显著.蚬木的天然更新受到物种的生物学特性,种内、种间竞争,生境异质性及人为干扰等因素的综合影响. A field survey was conducted in the karst mountainous region in Pingguo County of Southwest Guangxi, China to explore the structural characteristics, spatial distribution pattern, and growth dynamics of young Excentrodendron hsienmu as well as the main environmental factors affect- ing the natural regeneration of the E. hsienmu population. In the study area, the population struc- ture of the young E. hsienmu was stable, and exhibited a clumped spatial pattern for the seedlings and seedling sprouts. The ground diameter growth and height growth of the young E. hsienmu pres- ented the same variation trend, i. e. , the ground diameter increased with increasing height. The ground diameter growth and height growth of the E. hsienmu seedlings were limited by population density, i. e. , decreased with increasing population density. The correlation analysis showed that the trees more than 2.5 m in height and the shrubs were the major stand factors affecting the natural regeneration of young E. hsienmu, while the herbs had no significant correlation with the regenera- tion. The percentage of covered rock also had no significant effects on the regeneration. Kruskal- Wallis ANOVA showed that there existed significant differences in the height and ground diameter of young E. hsienmu at different slope degrees and slope positions. The population density, height, and ground diameter had significant differences across slope aspects. The natural regeneration of young E. hsienmu was comprehensively affected by the species biological characteristics, intraspe- cific competition, interspecific competition, heterogeneous habitat, and anthropogenic disturb- anees.

关 键 词： 蚬木 幼龄植株 天然更新 空间格局

领　　域： [生物学]