In Fuyuan county,14 trunks of Betula luminifera plants from different slope,elevation;soil thickness were selected and analyzed.

• 在富源县选择不同坡向、不同海拔、不同土层厚度上生长的光皮桦共14株进行树干解析,结果为平均胸径、树高、材积的生长量分别为0。