Response of ex-situ conservation plant flowering phenology to climate change in Wuhan
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摘要: 以中国科学院武汉植物园内栽培的长果秤锤树（Sinojackia dolichocarpa C. J. Qi）、山白树（Sinowilsonia henryi Hemsl.）、夏腊梅（Sinocalycanthus chinensis Cheng et S. Y. Chang）、紫茎（Stewartia sinensis Rehd. et Wils.）和绒毛皂荚（Gleditsia vestita Chun et How ex B. G. Li）5种迁地保育植物为对象，通过2008-2016年观察记录的初花期物候及整个花期长度的数据，研究花期的年际变化规律及其与迁入地武汉气候因子的相关性。结果显示：（1）从初花期来看，长果秤锤树的初花期每年提前1.25 d，紫茎的初花期每年推迟1.35 d，绒毛皂荚的初花期每年推迟1.22 d。（2）从花期长度来看，山白树的花期每年增加1.72 d，夏蜡梅的花期每年减少1.62 d，紫茎的花期每年增加0.32 d。（3）从花期与气候因子的相关性来看，年降水量、年平均相对湿度、 > 10℃有效积温、花前 > 10℃的有效积温是影响这5种植物初花期、花期长度的主要气候因子；不同物种间影响花期的主要气候因子有所差异。Abstract: In the current study, we analyzed the flowering phenology of five ex-situ conserved plants, including Sinojackia dolichocarpa C.J.Qi, Sinowilsonia henryi Hemsl., Sinocalycanthus chinensis Cheng et S.Y.Chang, Stewartia sinensis Rehd. et Wils., and Gleditsia vestita Chun et How ex B. G. Li, in Wuhan Botanical Garden, Chinese Academy of Sciences, using meteorological data and interannual variation from 2008 to 2016. Results showed that: (1) Flowering phenology of Sinojackia dolichocarpa occurred 1.25 d earlier per year; Stewartia sinensis flowering time was delayed by 1.35 d per year; and flowering phenology of Gleditsia vestita was delayed by 1.22 d per year. (2) Flowering length for Sinowilsonia henryi increased 1.72 d per year; flowering length for Sinocalycanthus chinensis decreased 1.62 d per year; and flowering length for Stewartia sinensis increased 0.32 d per year. (3) Pearson correlation coefficients were calculated to indicate the relationships among flower phenological periods and related meteorological factors. Results showed that annual precipitation, annual average relative humidity, effective accumulated temperature of more than 10 degrees, and effective accumulated temperature of more than 10 degrees before flowering were correlated with flower phenological, but the main meteorological factors differed from plant to plant.
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