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桦属在日本有９个种，主要分布在本洲北部，其中日本白桦、日本岳桦和棘皮桦３种桦树最为重要，研究的也较多。自１９５８年以来主要研究了桦树的抗野兔、野鼠特性，以及桦属种间杂交的后代抗野兔、野鼠性的差异，桦属种间杂交和种内杂交其杂交方式不同对种子产量和成活率等的影响；日本白桦、棘皮桦种源试验；日本白桦无性系的测定与早期选择；棘皮桦材质材性的研究。制定了日本桦树的育种战略。
There are 9 species of Betula in Japan, mainly distributed in the northern part of this continent. Among them, 3 species of Betula platyphylla, Betula ermanii and Echinochloa crus-galli are the most important and studied. Since 1958, the study has mainly studied the anti-hare and wild rat characteristics of birch and the anti-hare and rodent sex differences among the interspecific hybrids of Betula sp., The differences in the hybridization between birch interspecific hybridization and intraspecific hybridization on seed yield and survival Rate and other effects; Japanese white birch, Betula farnese provenance; Japanese white birch clones determination and early selection; Echinochloa crusgalli material properties. Developed a Japanese birch breeding strategy.