樟子松种子园无性系产种量差异分析

ANALYSIS OF DIFFERENCE IN SEED YIELD AMONG MONGOLIAN PINE CLONES IN THE SEED ORCHARD

21个无性系连续3年的种子产量观测结果表明,不同无性系间,不同年份间产种量不同。这种差异是由于无性系的遗传性状及雌、雄球花开放时的天气条件所致。花期为中间类型的无性系产种量较高;在雌、雄球花开放期内天气晴朗,则次年球果产量大,出种率高;种子产量与树高、胸径、冠幅呈正向相关,达0.1%水平;分枝角度越大,无性系的种子产量亦越高。

The 3 years studies on the seed yield of 21 clones show that there are differences in seed yield among clones and years which depends on the genetic characteristics of the clones and the weather conditions in flowering period.The clones with medium flowering period(i.e.not too early or late)have higher seed yield.Fine weather in the fowering period induces a high cone and seed yield in the following years. Seed yields is in positive correlation with tree height, diameter and crown size(to a level of 0.1%)The wider the branching angle of clone,the higher the seed yield.