光皮桦优良遗传材料选择及改良前期效果

The superior genetic material selection and the performance of improved Betula luminifera in the earlier stage

从形质指标、绝对生长量指标、相对生长量指标、木材材性指标4个方面制定了光皮桦选优标准，并确选优树28株。优树树高、胸径、木材密度、纤维含量、纤维长度分别大于林分平均值4．3％～45．9％、29．0％～81．7％、1．3％～10．3％、1．2％～10．1％、0．7％～9．6％。30个材料子代测定表明：优树子代不同的家系间，树高、胸径生长差异均达到极显著水平。经LSD显著性分析，评选出麻17、麻11、杨5、麻27、杨1、麻3、麻20、麻15共8个优良家系，可在生产中推广。

The superior standard of Betula luminifera was established on morphological index, absolute growth volume index, relative growth volume index and wood property index, and 28 superior trees were selected. The height, diameter at breast height, wood density, fiber content and fiber length were higher than the average stand with 4.3% - 45.9% ,29.0% - 81.7%, 1.3% - 10.3%, 1.2% - 10.1% and 0.7% - 9.6% respectively. The results of superior filial generation test of 30 materials showed that, the growth of tree height, diameter at breast height were extremely different from significantly among significant level in different families of superior filial generation. Based on significant analysis of LSD, the 8 superior families were selected and popularized, which including： B. luminifera-Mal7, B. luminifera-Mall ,B. luminifera-YangS, B. luminifera-Ma27, B. lurninifera-Yang1, B. luminifera-Ma3, B. luminifera- Ma20 and B. luminifera-Ma15.