修剪强度和留芽数量对紫薇二次开花的影响

Effects of pruning intensity and number of remaining buds on second flowering of Lagerstroemia indica

以日本复色矮紫薇(Lagerstroemia indica L.)5年生盆栽苗为试验材料,采用双因素完全随机区组试验设计,研究修剪强度和留芽数量对紫薇二次开花的影响。结果表明,修剪强度对紫薇修剪后萌芽长有极显著影响,轻度和中度剪梢萌芽情况较佳;修剪强度和留芽数量及其组合间对紫薇修剪后花枝长、花序长、整株花序数量均具有极显著影响,轻度剪梢、中度剪梢分别留4芽处理的花序长、小花枝数、整株花序数量指标较高;修剪强度对紫薇修剪后初花期、盛花期、末花期等主要物候期的影响较大,通过修剪能让紫薇二次开花,花期延长55 d。不同的修剪强度和留芽数量均能有效影响紫薇修剪后再次开花的情况。

The five-year potted seedlings of Japanese multicolored(Lagerstroemia indica) were used as test materials. The effects of pruning intensity and the number of remaining buds on the secondary flowering of L. indica were studied using a two-factor completely randomized block design. The results showed that pruning intensity had a significant effect on sprout length, and the germination of light and medium-sized cutting shoots was better. The pruning intensity and the number of remaining buds and their combinations have extremely significant effects on the flower branch length, inflorescence length, and the number of inflorescences of the L. indica after pruning. The index of inflorescence length, number of small flower branches, and inflorescence number of the whole plant were slightly higher with slight cutting and moderate cutting with 4 buds respectively. Pruning intensity has a greater effect on the main phenological stages such as the initial flowering stage, the flowering stage, and the last flowering stage after prunes. L. indica can be re-flowered by trimming, and the flowering period can be prolonged by 55 d. Different pruning intensities and the number of remaining buds can effectively affect the condition of flowering again of L. indica.