STUDY ON THE SEED QUALITY OF ALNUS CREMASTOGYNE

Alnus cremastogyne is a fast growing timber tree species with much utilization.It originated in Sichuan and has been cultivated for 1000 years.So far it has been introduced to Zhejiang,Anhui and Jiangxi Provinces.Authors tested 75 copies of excellent single-tree seed and 5 copies of mixture seed from 6 counties in Sichuan and Zhejiang.The result indicated that the 1000-seed weight is 0.474 g in average and it varied from 0.15g to0.79g.The difference is obvious among different seed sources-percentageof germination was 2-83%,43.7% in average at 25℃ room temperature.Besides,the percentage of germination was also correlated with altitude,the side of slope,especially tree age.When we want to determine the time for seed collection,we must consider the method for seed collection and the environment of seed sources.