胡杨、灰叶胡杨花空间分布及数量特征研究

研究了不同居群的胡杨、灰叶胡杨花空间分布及其数量特征.结果表明,无论是胡杨还是灰叶胡杨,其雄树的树高、最低花位、集花区下限、集花区上限、最高花位皆低于雌树,并且雌株与雄株的花序分布范围亦有着较大的重叠区域.在树体上,雄花序主要分布在树冠的中部,上部次之,下部最少;雌花序主要分布在树冠的上部,中部次之,下部最少.胡杨的单株花序量、花朵花药数、花药花粉量和花序花粉量均小于灰叶胡杨,而花序花朵数胡杨雄树的小于灰叶胡杨,雌树的大于灰叶胡杨.统计分析表明,不同居群胡杨的单株花序量、花序花朵数与花药花粉量是相对稳定的,而灰叶胡杨仅雄树的单株花序量是稳定的.

A study on the spatial distribution and quantitive characteristic of Populus euphratica and Populus pruinosa flowers

The spatial distribution and quantitive characteristic of Populus euphratica and Populus pruinosa flowers from different inhabited environment was studied. The results showed that the height,undermost and topmost position of flowers, the lower limit and upper limit catkin concentration of male trees were lower than that of female trees. The distributed range of catkins of male and female trees had a wider superpose. The order of male catkin quantity in the canopy was middle>upper>under and that of female catkins quantity was upper>middle>under. The quantity of catkins of a tree, the number of anther of a inflorescence, the quantity of pollen of a anther and a catkin of Populus euphratica were little than that of Populus pruinosa. The stastic showed that the quantity of catkin of a tree, the number of inflorescence of a catkin and the quantity of pollen of a anther were relatively stable, and the quantity of catkin of a tree of Populus pruinosa male trees was stable.