Phenological observations onLarix principis-rupprechtii Mayr. in primary seed orchard

Through 5 years of phenological observations onLarix principis-rupprechtii Mayr. in primary seed orchard and studies on population and individuals of clones, the annual periodic phenological laws were revealed and the annual phenological periodic table was drawn up. The correlation between various phenophases, the air temperature and active accumulated temperature were analyzed and expounded. The authors also analyzed the similarities and differences of phenophases among clonal individuals as well as the blooming properties of male and female flowers at the same time. This study could provide theoretical reference for working out the production plan of improved varieties and other management measures in seed orchard ofLarix principis-rupprechtii.