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对白桦16个种源的1年生苗高、地径进行方差分析．用各种源的苗高、地径与地理、气候因子做相关分析、结果表明：各种源间的苗高、地径差异极显著．苗高、地径与各种源的地理纬度呈负相关．与经度呈正相关。用16个种源的苗高、地径聚类分析．结合各种源的地理、气候因素。可将16个白桦种源区划为5个种源区。即六盘山及祁连山种源区、辽东及长白山种源区、小兴安岭及完达山种源区、大兴安岭种源区和新疆北部种源区，根据白桦苗期的生长表现。初步选择出最佳种源为汪清、凉水种源。
The annual height and diameter of 16 provenances of Betula platyphylla were analyzed by ANOVA. The correlation analysis of the seedling height, the diameter and the geographical and the climatic factors of various sources showed that the differences of seedling height and diameter among all the sources were extremely significant. Seedling height and ground diameter are negatively correlated with the geographic latitudes of various sources. And longitude was positively correlated. With 16 provenances of seedling height, diameter cluster analysis. Combination of various sources of geography and climate factors. The 16 provenances of Birch can be divided into 5 provenance areas. Namely the provenance of Liupanshan and Qilian Mountains, provenances of Liaodong and Changbai Mountains, provenances of Xiaoxing’anling and Wandashan, provenances of Daxinganling and provenance of northern Xinjiang, according to the growth of birch at seedling stage. The best source for the initial selection of Wang Qing, cold water provenance.