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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。
Seeds from 16 provenances of Betula platyphylla showed that there was a significant difference in seed size, quality and germination rate among all the provenances. Seed size and quality had a significant negative correlation with latitude and longitude. That is, from northeast to southwest seed is growing. Also more and more heavy; seed germination rate and longitude showed a significant negative correlation between the germination rate from east to west is getting higher and higher. According to various sources of geographical and climatic factors clustering results. Preliminary divided into five provenance areas. Daxinganling provenance area: xiao xinganling provenance area; Wandashan, ZhangGuangcai provenance area; Changbai Mountain, Qianshan provenance area; Liupanshan, Qilian Mountains provenance area.