胡杨、灰叶胡杨开花生物学特性研究

Study on the Flowering Phenology in Populus euphratica and Populus pruinosa

从居群水平研究了胡杨、灰叶胡杨不同居群的开花物候特征。结果表明:胡杨、灰叶胡杨各居群均表现为雄株开花物候早于雌株,一般可授期开始较散粉期晚1～4d,结束较散粉期晚2～5d,并且居群散粉期和可授期的重叠期较长。在同一居群内,胡杨、灰叶胡杨同性单株间开花期的不一致性较高。两个种相比较,胡杨居群的开花进程比灰叶胡杨居群早2～5d,并且从每日开花株数累积分布来看,胡杨散粉期、可授期为双峰型,灰叶胡杨为单峰型。

Flowering phenology characteristic of Populus euphratica and Populus pruinosa in different populations was studied. The results showed that: flowering phenology of male trees was earlier than that of female ones in all populations of P. euphratica and P. pruinosa. Generally, the beginning of female bud burst time was 1-4 days later and the end was 2-5 days later than those of male bud burst time, respectively. The overlap period of male and female bud burst time was longer. In the same population, the inconsistency of inflorescence were relatively high among same gender of P. euphratica or P. pruinosa. Compared P. euphratica with P. pruinosa, flowering time of P. euphratica population was 2-5 days earlier than that of P. pruinosa. According to cumulative distribution of flowering individuals each day, the male and female bud burst time of P. euphratica was bimodal type, and that of P. pruinosa was unimodal type.