云南红豆杉小孢子叶球和种子的时空分布规律

Temporal and spatial distribution of the pollen cones and seed in Taxus yunnanensis

通过研究云南红豆杉种子和小孢子叶球的空间分布及年际变化规律,得出如下结果:小孢子叶球和种子的空间分布规律相似,在树体的各个水平方向间没有显著差异,在垂直分布上差异显著,从上到下,小孢子叶球的相对密度依次递减;种子的相对密度最高的是树体中部,最低的是下部.种子和小孢子叶球相对密度的年际变化结果表明,种子和小孢子叶球的相对密度在年际间变化明显,都达到了显著水平.种子的相对密度在2006年和2007年间呈低度负相关,R=-0.46;小孢子叶球的相对密度在2006年和2007年间呈高度正相关,R=0.86.种子相对密度同新枝相对密度及最长新枝长度分别呈低度负相关和微弱负相关,相关系数分别为R=-0.47和R=-0.29.基于以上结果,作者认为光是影响种子和小孢子叶球空间分布的主要因素之一;气候会影响种子和小孢子叶球的产量;就某一植株而言,当年种子产量会影响下一年种子产量;小孢子叶球的产量可能同植株的遗传特性相关.

The temporal and spatial distribution of the pollen cones and seed in Taxus yunnanensis was explored, and the results are as follow：there is no obvious variation of the relative density of seed and pollen cones in all directions horizontally; but the variation at the different layers of the trees is significant： from top to base, the relative density of pollen cones declined, and the relative density of seeds is highest in the middle level, and lowest at the base;the variation in the outputs of the seeds and pollen cones between years is significant：the seeds production in 2006 was negatively related to that in 2007 with R = - 0.46 ; the pollen cones production in 2006 was positively related to that in 2007 with R = 0.86 ; the seeds production was negatively related to the production of new twigs with R =-0. 47, and was negatively related to the length of longest new twigs with R = - 0.29. Based on these results, the authors considered that sun light might be one of the primary factors that affected the seeds and pollen cones＂ distribution;climate might affect the seeds and pollen cones＂ production;as it was observed in any individuals that the seeds＇produetion was affected by the seeds＂ production of the last year;the pollen cones＇production might be decided by the its genetic characters.