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为探讨不同发育阶段林分下的雌雄异株植物与性别相关的性比格局和空间分布,以5.2ha的中龄林和1.0ha的老龄林固定监测样地内簇毛槭(Acer barbinerve)雌、雄植株的定位观测数据为基础,对比分析了长白山不同林龄的阔叶红松林中的已花簇毛槭的性比格局、空间分布及其与环境因子间的关系。研究结果表明:中龄林和老龄林中雌树的胸径均显著大于雄树,总体上性比极显著偏离1:1。随着树木的生长,性比由偏雄性转变为不再偏离1:1,这可能是因为雄树始花胸径较小所致。O-ring单变量点格局分析显示中龄林样地中的雌树和雄树符合异质性泊松分布,老龄林样地中的雌树和雄树均完全随机分布。O-ring双变量点格局分析显示,在随机标签假设下,中龄林中的雌树和雄树在1-4m尺度上空间负相关,在4-100m尺度上空间独立,老龄林中的雌树和雄树在所有尺度上空间独立。簇毛槭在中龄林和老龄林中不同的空间分布格局说明中龄林中簇毛槭分布的斑块性相对明显,随着林分的发育,郁闭度较高的老龄林样地中环境异质性降低,环境因子对簇毛槭分布的影响减弱。典范冗余分析(redundancy analysis,RDA)表明在中龄林中,林分密度只能解释3.73%的雌树分布的变异,与雄树分布的相关性不显著,叶面积指数和非生物因子对雌树和雄树的影响均较弱;老龄林中簇毛槭的分布与生物因子和非生物因子的相关性均不显著。
In order to explore the gender-related sex ratio pattern and spatial distribution of dioecious plants under different developmental stages, the female Acer barbinerve was fixed and monitored in 5.2ha middle-aged and 1.0ha old- Based on the observed data of the male plants, the sex ratio pattern, spatial distribution and its relationship with environmental factors in the broad-leaved Korean pine forests of different ages in Changbai Mountains were comparatively analyzed. The results showed that the DBH of the middle-aged and aged trees were significantly larger than that of the male trees, and the overall sex ratio deviated significantly from 1: 1. With the growth of trees, the sex ratio shifted from partial male to no longer deviated from 1: 1, which may be attributed to the smaller DBH diameter of male trees. O-ring univariate point pattern analysis showed that the female tree and male tree in mid-aged forest conformed to the heterogeneous Poisson distribution, and the female and male trees in the aged forest were completely randomized. O-ring bivariate point pattern analysis showed that under random label assumptions, the female tree and the male tree in the middle-aged forest were spatially negatively correlated in the 1-4m scale and the spatial independent in the 4-100m scale. The female tree in the aged forest The tree is independent of the tree on all scales. The spatial distribution pattern of Acer palmatum in the middle-aged and aged stands shows that the patchiness of the distribution of Acer ciliata in the middle-aged stands is relatively obvious. With the development of stand, Environmental heterogeneity decreased, environmental factors on the distribution of Acer Asclerachis diminished. The redundancy analysis (RDA) showed that in the middle-aged stands, the stand density could only explain the variation of 3.73% of the female tree distribution, and the correlation with the male tree was insignificant. The leaf area index and abiotic factor The effects of both female and male trees were weaker. The distribution of Acer palmatum in the aged forest had no significant correlation with biological factors and abiotic factors.