基于多点解析木的长白落叶松建筑材优良种源选择1）

采用伐倒木取样的方法，对帽儿山、凉水、加格达奇3个地点31年生长白落叶松种源的生长、密度以及抗压、硬度、抗弯等14个性状进行测定，通过方差分析、主成分分析、稳定性分析等方法筛选出优良的建筑材种源。结果表明：3个地点不同种源间树高、胸径、材积差异显著，其他性状差异极显著。材积的变异系数最大，为36．43％，基本密度的变异系数最小，为10．11％。整合几种分析方法筛选出穆棱、天桥岭这两个种源为优良建筑材种源。两个优良种源的树高、胸径、材积、基本密度、气干密度、顺纹抗压强度、弦面硬度、径面硬度、抗弯强度、抗弯弹性模量的平均值为19．02 m、20．67 cm、0．320 m3、0．440 g／cm3、0．539 g／cm3、36．79 MPa、3293．54 N、3423．34 N、148．54 MPa、15．04 GPa，与3个地点种源平均值相比分别增产2．348％、3．261％、7．353％、1．614％、2．366％、1．589％、2．399％、1．613％、2．765％、2．566％。

Superior Building Timber Provenances Selection of Larix olgensis in Different Sites Based on Analytic Timber

We studied the growth character , wood density , crushing strength , hardness , bending strength and other characters for the superior building timber provenances selection of 31-year-old Larix olgensis provenances in Maoershan , Liangshui and Jiagedaqi .After testing the felled-wood samples , we selected superior building timber provenances by variance analy-sis, multiple comparison , principal component analysis and stability analysis .The differences of tree height , DBH and tim-ber volume among families were significant , and the differences of other characters were extremely significant .The variation coefficient of timer volume was the most (36.43%) among all characters, while the wood basic density was the least (10.11%). We selected two provenances ( Muling and Tianqiaoling ) as the superior building timber provenances .The average timber volume, basic density, crushing strength parallel to grain , the hardness of tangential section and bending strength of these two provenances were 0.320 m3, 0.440 g/cm3, 36.79 MPa, 3 293.54 N and 148.54 MPa, respectively, and they were 7.353%, 1.614%, 1.589%, 2.399%and 2.765%more than the averages, respectively.