【摘要】 在新疆塔里木河上游阿瓦提县胡杨林自然保护区内设置1.25hm2的样地,应用相邻格子法进行每木调查获取野外资料,研究灰叶胡杨种群结构和空间格局特征。结果表明:灰叶胡杨种群幼苗缺乏,大、老龄个体相对较多,其年龄结构呈倒金字塔型、属衰退型种群。种群更新困难,生存发展前景堪忧。灰叶胡杨种群空间格局符合聚集分布,随发育进程其空间格局由均匀型向聚集型转变,聚集强度逐渐增强。种群不同发育阶段的空间分布格局差异与物种本身的生物、生态学特性有关,而且与物种的生境密切相关。更多还原

【Abstract】 1.25hm2 plots were established in natural Populus euphratica Oliv forest in the upper reaches of Tarim river,Awti county,XingJing autonomouse region and field data were obtained by investigating with contiguous grid quadrate method.The distribution pattern and age structure of Populus pruinosa were studied.The result showed that when the resources of seedling was lack and resources of large and old trees were abundant,the age structure of P.pruinosa population was inverted pyramid shape and belong to the type of declining population.There was weak ability in natural regeneration and large difficult to live in the future.Spatial distribution pattern of P.pruinosa population conformed to clumped distribution.The distribution patterns of different development stages of P.prninosa population transformed from even type to clumped distribution,the aggregated intensity gradually increase with age development.The differences of spatial distribution pattern at different development stages were not only closely related to ecological and biological characteristics of species but also its environment.更多还原