杉木种子园中无性系的开花结实规律

根据杉木树冠各部位的年龄大小，将杉木树冠划分为若干年龄段。通过对各年龄段♀、♂球花（果）数的调查分析，结果表明：杉木种子园中各无性系♀、♂球花（果）数以及座果率的差异都极其显著、而且低产无性系占一半以上；不同年龄段上的♀、♂球花（果）数的差异也达到极其显著水平并呈规律性变化，但各年龄段的座果率基本一致。

FLOWERING AND SETTING REGULARITY OF CLONES IN CHINESE FIR SEED ORCHARD

The distributions of female cone, male cone and seed cone in the crown of Chinese fir ( Cunningbania laceolata Lamb. Hook.) were investigated in seed orchard by growth age section. The results show that significant differences about these characteristic values existed among clones and growth age sections. On the other hand, the setting ratio varies greatly with clones, but not with growth age sections. The clones of low output accounted for over 50% of all clones in seed orchard and the distributions of female cone, male cone and seed cone in the crown display regular changes, but are greatly different from that in normal forest land.