杉木种子园种子品质的观测和分析

为了提高杉木种子园的播种品质，１９９１～１９９４年在贵州黎平、天柱、锦屏和四川洪雅林场杉木种子园开展了有关试验和观测．研究认为：在种子园花粉产量较低，散粉期多雨的年份，种子品质较差；各无性系种子品质的排序在年份间的相关性较弱，但种子质量较高或较低的两类无性系在种子园不同大区和不同年份间仍较稳定，因此，从种子品质考虑对无性系作再选择是有效的；自交是出现涩籽的一个主要因素，与空籽的形成关系不大，空籽产生的直接原因是授粉不足；在开花盛期对幼树和可授期较早或较晚的无性系进行一次辅助授粉能收到明显的效果

Observation and Analysis on the Traits of Seeds from Chinese fir Seed Orchards

In order to improve the sowing quality of seeds of Chinese fir seed orchards,some tests and observations were carried out at Liping,Tianzhu and Jinping counties in Guizhou province and Hongya county in Sichuan province from 1991 to 1994. The results showed that the sowing quality of seeds were bad due to the shortage of pollens and unbroken spell of wet weather during pollen releasing;the correlation between years for sowing quality of seeds collected from different clones was not significant,but the difference between two kinds of clones with better and worse seeds was stable, therefore, the reselection of clones should be a measure to improve the seed quality. Selfing was one of primary causes to produce tannic seeds,but it had no significant effect on the production of empty seeds; the shortage of pollen was the main factor to cause empty seeds.The supplemental pollination was effective for improving sowing quality of seeds of younger grafts only once during optimum receptivity periods.