不同来源地同种植物种群间物候期比较研究

Comparison of phenology among tropical plant populations from different source regions

关键词:  热带植物  物候  同步性  变异

Key words:  tropical plants  phenology  synchrony of phenology  variation in phenology

摘要:

通过比较西双版纳植物园内雨树和甜菜豆不同大洲来源种群间的物候期,本研究探讨了两种植物种群间的物候分化现象及其与气候因子的关系。结果发现:(1)两种植物不同来源地种群间物候期相似,但是同步性不高,呈现明显的分化现象,且不同种群间萌叶起始期先后顺序差异显著;(2)不同种群间物候期同步系数与气候因子相关,尤其干季气候因子。因此可以认为:不同的生境气候因子是导致两种植物不同种群间出现物候变异的重要因子,并且这种关系可能会影响不同种群对气候变化的响应。

Abstract:

Some species usually cover wide regions with different circumstances,so it was expected that the species would demonstrate various phenotypes due to different selection pressures. In this study,the phenologcial differences of 2 tropical species,e.g.,Samanea saman and Glirdia sepium planted in Xishuangbanna Tropical Botanical Garden were explored. Each species has individuals form two or three different continents and shared a same phenological observation period. Although all the plant individuals showed similar phenological pattern,there were still obvious differentiation in phenology among different populations. The synchronous index of phenology for the two species was low,and the flushing commencement dates were significantly different among the populations. Relationship analysis showed that the differentiation in phenology was related to climatic variables,especially those in the dry season. The results suggested that the different climate characters in primary habitats have resulted in phenological variation in the two species,which would influence their response to climate change in the future.