密花柽柳的两季开花结实及其生态意义

对分布于新疆荒漠地区的密花柽柳开花物候、传粉及结实特性进行了比较研究.结果表明:①密花柽柳一年有2个独立的花期--春花期和夏花期;春花花期短,仅为11 d,为集中开花模式;夏花花期长,为69d,但每天开花数量比春花期少,为持续开花模式.②春花和夏花都有自交亲和性,套袋实验表明,春花和夏花都能进行风媒传粉和虫媒传粉.③夏...

Ecological Significance of Bi-seasonal Flowering and Fruiting of Tamarix arceuthoides

In this paper, the flowering-biological and pollination-ecological properties of Tamarix arceuthoides in a desert in Xinjiang are studied. The results are as follows: (1) T. arceuthoides plants flower twice a year in spring and summer. The spring flowering period is shorter (11 days only) than the summer one, the spring flowering belongs to a mass-flowering pattern, but the summer flowering is an extended-flowering pattern; (2) It is found that T. arceuthoides is self-compatible, but it lacks the self-pollination mechanism, so it needs pollination media. T. arceuthoides plants are pollinated mostly by insects during the spring flowering period but mostly by wind during the summer one; (3) During the summer flowering period, the flowers are visited by both bees (Bracohidae) and beetles, but they are visited almost by bees (Apis indica and Bracohidae) and flies (Syrphidae) during the spring one; (4) Fruiting rate of T. arceuthoides plants during the spring flowering period is much higher than that during the summer one under natural conditions, and T. arceuthoides plants produce seeds quickly in a short fruiting period (12-7days) during both spring and summer flowering periods. T. arceuthoides plants adapt their environment by their unique way, and the bi-seasonal flowering of T. arceuthoides plants is of significance for understanding the adaptation mechanism to habitats.