日本落叶松种子园花粉散发及其空间分布特征

Studies of Pollen Dispersal and Its Spatial Distribution in Seed Orchard of Larix kaempferi(Lamb.) carr

对湖北省建始县长岭岗林场日本落叶松种子园内花粉散发和空间分布特征进行2年的研究．结果表明：日本落叶松花粉散发受气候因子的影响很大；整个散粉期间日本落叶松花粉散发量呈现低一高一低的节律，每天花粉散发量呈极显著差异；散粉期间出现一个散粉高峰期，一般持续3～5d，散粉高峰期间每天不同时间段的散粉量也呈现低一高一低的节律，散粉高峰时间段出现在8：00～16：00，具体时间段受当日天气的影响，每天不同时间段内花粉散发量呈极显著差异；种子园内不同样点花粉散发量中，八方位花粉散发量及树冠内、中、外部花粉散发量均未达到显著性差异，花粉分布都呈均匀分布型1种子园内不同垂直高度花粉散发量呈极显著差异，花粉分布呈集群分布型．

Pollen dispersal and its spatial distribution in the seed orchard of Lariat kaempferi （Lamb.） carr in Changlinggang Forest Farm, Jianshi County, Hubei Province has been observed for 2 years. The results show that pollen dispersal is affected by climate dramatically. Pollen dispersal has a rhythm of low-high low during the whole pollen dispersal period. Pollen quantity in space has significant difference from day to day. A peak time of 3-5 days usually appears during the whole period. Pollen dispersal also has a rhythm of low--high--low during the peak time. The peak time of each day appears in 8 ： 00-16：00, which is practically affected by weather. Pollen quantity in space in different time of each day also has significant difference. Pollen quantity in space is of no significant difference along horizontal directions, along 8 orientations, and on different positions of a tree＇s crown in the seed orchard, and all the pollen distributions are of uniform types, Pollen quantity along different vertical heights has significant difference and the pollen distribution is a cluster distribution type.