白桦不同种源种子形态特征及发芽率

The Configuration Characters and Germination Percentages of Various Provenance Seeds of Betula platyphylla

对白桦１６个种源的种子研究表明：各地种子大小、质量及发芽率存在极显著差异；种子大小及质量与经纬度呈极显著的负相关．即从东北到西南种子越来越大。也越来越重；种子发芽率与经度呈极显著的负相关即从东到西发芽率越来越高。根据各种源地理气候因子聚类结果．初步划分为５个种源区。即大兴安岭种源区：小兴安岭种源区；完达山、张广才岭种源区；长白山、千山种源区；六盘山、祁连山种源区。

According to the study on the characters of 16 provenances of Betula platyphylla Suk.. the differencesof size. weight.and germination percentage of the provenances are significant, the size and weight of seedtire strongly correlated negatively with latitude and longitude. namely. the larger and weightier fromnortheast to southwest; the germination percentage is significantly correlated negatively with longitude.nanlely. the higher percentage from east to west. According to the clustering of the climate zoology factorsof provenances.5 provenances are divided as follows' Daxing' anting provenances, Xiaoxing'anlingprovenances： Wanda Mountains and Zhangguangcai range provenances, Changbai Mountains and QianshanMountains provenances; Liupan Mountains and Qilian Mountains provenances.