Wang Yan, Yang Xiao-Dong, Ali Arshad, Lv Guang-Hui, Long Yan-Xin, Wang Ya-Yun, Ma Yong-Gang, Xu Chang-Chun
Institute of Resources and Environment Science, Xinjiang University, Ürümqi, China.
Department of Geography and Spatial Information Technology, Ningbo University, Ningbo, China.
Front Plant Sci. 2020 May 6;11:536. doi: 10.3389/fpls.2020.00536. eCollection 2020.
Climatic factors are considered the major driving forces for variation of flowering phenology among species. Yet, whether flowering phenology of woody species varies with functional traits, growth form, and phylogeny in arid regions is unknown. In the present study, we evaluated the relationships of three characteristics of flowering phenology (i.e., first flowering date, end of flowering date, and flowering duration) against functional traits, growth form, and phylogeny across 59 woody plant species across 3 years in Ürümqi city of the Xinjiang Autonomous Region, in Northwest China. The results showed that, plant functional traits and growth form had significant influences on the variability of flowering phenology among species. The contributions of fruit type (34.7-43.5%) and flower color (30.1-30.7%) to the variability of flowering phenology were larger than those of pollination mode (4.6-14.4%), life form (8.4-14%) and maximum plant height (9.7-13.1%). Trees had the significant correlations in terms of flowering duration against first flowering date and end of flowering date, while shrubs showed the opposite pattern. The values of phylogenetic signal (Blomberg's ) of the three characteristics of flowering phenology ranged from 0.36 to 0.43, which were significantly lower than the expectation of the Brownian motion model. Our results suggested that functional traits, growth form and phylogeny all affected variability of flowering phenology among species. Our results provide a new perspective for correctly evaluating the relationship between global climate change and plant reproduction.
气候因素被认为是物种间开花物候变化的主要驱动力。然而，在干旱地区木本植物的开花物候是否随功能性状、生长型和系统发育而变化尚不清楚。在本研究中，我们评估了新疆维吾尔自治区乌鲁木齐市59种木本植物3年中开花物候的三个特征（即始花日期、花期结束日期和花期持续时间）与功能性状、生长型和系统发育之间的关系。结果表明，植物功能性状和生长型对物种间开花物候的变异性有显著影响。果实类型（34.7 - 43.5%）和花色（30.1 - 30.7%）对开花物候变异性的贡献大于传粉方式（4.6 - 14.4%）、生活型（8.4 - 14%）和最大株高（9.7 - 13.1%）。乔木在花期持续时间与始花日期和花期结束日期方面存在显著相关性，而灌木则呈现相反的模式。开花物候三个特征的系统发育信号值（Blomberg's ）在0.36至0.43之间，显著低于布朗运动模型的预期值。我们的结果表明，功能性状、生长型和系统发育均影响物种间开花物候的变异性。我们的结果为正确评估全球气候变化与植物繁殖之间的关系提供了新的视角。
