四川引种大花序桉花期与蒴果发育时空分布特征研究

为了探索大花序桉（Eucalyptus cloeziana）引种后花期和蒴果发育规律，对四川宜宾引种的5个种源7年生大花序桉花期和蒴果发育进行了研究。结果表明：（1）大花序桉花芽主要分布在树冠下层内膛，部分花芽直接从主干上萌发，同一个花枝的花蕾随机开放；（2）同一种源的大花序桉始花期差距不超过5 d，末花期差距不超过10 d，花期持续41~62 d，5个种源大花序桉花期从当年12月中下旬至翌年5月上旬，因此种源间存在花期不遇；（3）不同种源大花序桉开花率存在显著性差异，其中72号种源开花率（53.94%）最高，74号种源尚未生殖生长；（4）根据蒴果颜色和果爿状态将蒴果发育分为：发育早期、果爿形成期、果爿张开期和散种期。

Temporal and Spatial Distribution of Florescence and Capsule Development of Introduced Eucalyptus cloeziana in Sichuan Province

In order to explore the regularity of florescence and capsule development of Eucalyptus cloeziana, the flowering stages, were studied the blossom buds and capsules development of 7-year trees from 5 provenances which were introduced in Yibin of Sichuan. The results showed that:(1)Most of the blossom buds distributed in the lower canopy, few blossom buds germinated directly from the main stem, the buds on the same branch randomly opened. (2)The time gaps of the initial flowering stage from the same provenance was no more than 5 d, the time gaps of the determined stage from the same provenance was no more than 10 d, flowering stage last for 41-62 d. The florescence of 5 E.cloeziana provenances were from mid to late December to early May of the next year, so there was asynchronous flowering period from different provenances. (3)There was a significant difference in the flowering rate of provenances, No.72 had the highest rate of flowering, No.74 had not starting reproductive growth yet. (4)The external characteristics of capsule development can be divided into four stages:early development stage, mericarps formation period, mericarps opening period and seed dispersal period.