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种子的特征如种子的重量、大小和传播方式直接影响物种的扩散能力,从而影响物种空间分布的聚集强度。作者以古田山亚热带常绿阔叶林24 ha样地中89种木本植物为研究对象,分析了它们的种子大小、重量和扩散方式与物种聚集强度的关系。结果表明:在20 m范围内,样地内90%的物种为聚集分布,聚集强度随着尺度的增大而减弱,稀有种的聚集强度大于常见种。用系统发育独立比较(phylogenetically independent contrasts)方法排除了系统发育影响后,物种的多度与聚集强度呈显著相关(在15 m尺度,R2=0.32,P<0.001);种子大小与物种聚集强度的相关性较弱(R2=0.05,P<0.05),而种子重量与物种聚集强度之间的相关性相对较强(R2=0.14,P<0.05)。种子的传播方式显著地影响物种的聚集强度:无助力扩散物种的聚集强度显著地高于有助力扩散物种的聚集强度(F1,87=4.439,P=0.038),即长距离扩散导致物种的聚集强度减弱。可见,在亚热带森林中,种子性状通过影响种子扩散进而引起物种聚集强度的变化,是影响物种空间分布格局的重要生态因素。
Seed characteristics such as seed weight, size and mode of transmission directly affect the ability of species to diffuse, thus affecting the intensity of the spatial distribution of species. In this paper, 89 species of woody plants in the 24 ha plot of subtropical evergreen broad-leaved forest in Gutian Mountain were studied. Their seed size, weight, and diffusion patterns were analyzed. The results showed that in the range of 20 m, 90% of the species in the sample were aggregated, the aggregation intensity weakened with the increase of the scale, and the aggregation intensity of the rare species was greater than that of the common species. After exclusion of phylogenetic effects by phylogenetically independent contrasts, there was a significant correlation between abundance and aggregation intensity (R2 = 0.32, P <0.001 at 15 m scale); the relationship between seed size and species aggregation intensity (R2 = 0.05, P <0.05), while the correlation between seed weight and species aggregation intensity was relatively strong (R2 = 0.14, P <0.05). The mode of seed dispersal significantly affected the aggregation intensity of the species: the intensity of aggregation of the non-assisted species was significantly higher than that of the species that facilitated the proliferation (F1,87 = 4.439, P = 0.038), ie, the long-distance diffusion led to the aggregation of species Weakened intensity. It can be seen that in the subtropical forests, the seed traits affect the intensity of seed aggregation by affecting seed dispersal, which is an important ecological factor that affects the spatial distribution patterns of species.