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为了明确城市园林中紫薇(Lagerstroemia indica)开花物候的变化特征,探讨花期影响因素和指导开花植物配置,对川南城市园林栽培的紫薇植株进行定期观测,记录了紫薇的2011—2014年开花物候,分析个体、群体水平上物候事件的差异以及植株大小和气候因子的影响。结果表明:紫薇个体在6月初至9月中旬进入花期,末花期多在10月,花期持续8~137 d,具有60~90 d花期的植株比例最高;不同年份开花植株比例和物候特征存在一定差异,种群水平花期持续时间最短为2014年的106 d,最长为2012年的130 d;但开花植株数量的时间格局总体相似,始花期与花期持续时间之间相关性显著;基径显著影响紫薇的开花物候特征,较大的植株往往开花较早,并且具有更长的花期;紫薇的盛花期多集中在7—9月;开花植株数量与前一个月的平均气温呈显著正相关,与同期温度、降雨量相关性不显著;紫薇开花物候在气候因子影响下年际间存在明显差异,也表现出一定规律性格局;园林中多样化的个体物候有利于维持群体水平上花期的观赏性,选择大植株可获得较稳定的观赏效果。
In order to clarify the characteristics of the flowering phenology of Lagerstroemia indica in urban gardens, and to explore the influencing factors of florescence and to guide the allocation of flowering plants, the crape myrtle plants cultivated in urban landscape in southern Sichuan were regularly observed. The flowering phenology of crape myrtle between 2011 and 2014 was recorded. Differences in the phenological events at the individual, group level, and plant size and climatic factors. The results showed that the individuals of Crape Mycelium entered the flowering stage from early June to the middle of September, the last flowering stage was in October, the flowering period lasts for 8 ~ 137 days, and the plants with the flowering period of 60 ~ 90 days have the highest proportion. The flowering plant proportion and phenological characteristics in different years have certain The difference was that the duration of florescence at the population level was the lowest in 106 days in 2014 and the longest was at 130 days in 2012. However, the time pattern of flowering plants was generally similar, and the correlation between the initial florescence and flowering duration was significant. Crape myrtle flowering phenology characteristics, larger plants tend to flowering earlier, and have a longer flowering; crape myrtle mostly concentrated in the July-September; the number of flowering plants and the average temperature of the previous month was significantly positively correlated with The correlation between temperature and rainfall over the same period was insignificant. The crassulaceae flowering phenology had obvious difference in the years under the influence of climatic factors, and also showed some regular patterns. The diversity of individual phenology in gardens could be helpful to maintain the ornamental value of population at the flowering stage , Choose plants can get more stable ornamental effect.