腾格里沙漠东南缘沙木蓼传粉生态学特性研究

研究了腾格里沙漠东南缘沙坡头地区沙木蓼的花部性状、花粉胚珠比(P/O)、花粉活力和育性、柱头可授性、访花昆虫种类和访花频率、杂交指数(OCI)及不同套袋处理的结实率.主要结果如下:沙木蓼单花花期3 d,开花初期花粉活力最高,可达74%,可持续4 h,柱头可授性在开花9 h后达到最高;繁育系统为异交,部分自交亲和,需要传粉者,不存在无融合生殖现象;主要传粉昆虫有宽结大头蚁、意大利蜜蜂、黑带食蚜蝇等.

Pollination Biology of Atraphaxis Bracteata A. Los. in the Southeastern Edge of Tengger Desert

The floral quantity characteristics, pollen ovule rate （ P/O ）, pollen viability and fertility, stigma re- ceptivity, floral visitors and their visiting frequency, outcrossing index （ OCI）, fruit set rate of Atraphaxis bracte- ata A. Los. in the field of southeastern edge of Tengger Desert, Shapotou, China, were studied. The main results were as follows ： the flowering of Atraphaxis bracteata A. Los. was 3 days, pollen viability achieved the maximum 74% at the beginning of flowering, and can keep 4 hours, stigma receptivity achieved the maximum at 9 hours later in flowering. The breeding system was facuhative xenogamy, partial self-incompatibility, pollinators were required, and there were no apomixes. The most common floral visitors were Pheidole nodus Smith, Apis mellifera Linnaeus and Episyrphus balteatus De Geer.