甘南高寒草甸群落花期物候研究

Plants flowering phenology in Gannan alpine meadow

对草地群落物候的研究,不仅有助于对草地群落功能认知,更重要的是为生态系统评估提供背景资料。本研究从地理环境因素、功能性状、传粉者竞争以及系统发育4个方面讨论影响甘南高寒草甸植物花期物候的因素。结果表明,在群落水平上,开花期涵盖了整个生长季,但在整体上有一个高峰期,群落中各物种的始花期、开花峰值期及开花持续期不同,每一物种均有其独特的花期格局;植株高度(P<0.001)和种子大小(P=0.034)能够显著地预测开花,而比叶面积(SLA)则不显著(GLM,P>0.05);风媒物种开花期早于虫媒物种(P=0.008);花期物候重叠与系统发育距离之间存在着负相关关系。

The research on the phenology of the grassland community could help cognize the function of the grassland community, and provide the background data for the ecosystem assessment. In this study, the factors that affect the flowering phenology of alpine meadow in Gannan were discussed in four aspects： geographical environment, functional traits, pollination modes and phylogeny. The results showed that, at the community level, the flowering period covered the whole growing season, but there was still a peak flowering period in the whole species. The first flowering date, peak flowering date and duration of flowering time were different. Each species has unique pattern in flowering phenology; Plants height（P〈0.001） and seed size（P=0.034） could significantly predict flowering time; Wind pollinated species flowered earlier than insect-pollinated species（P = 0.008） ;There was a negative correlation between flowering phenology overlaps and phylogenetic distances.