论文部分内容阅读
通过对东北次生林五种蓄积量较大的木材(紫椴、水曲柳、蒙古柞、山杨、白桦)物理力学性质试验,测试了密度,干缩系数和各项力学强度指标,并与东北原始林相同树种相应指标作了比较分析。结果表明次生林木径向生长大于原始林木53.1％,各项力学指标与原始林木材基本接近,仅干缩系数略高于原始林木材,但五种次生林木材的差异干缩性并不大。可以认为,采用树干通直成熟的次生林木材完全可以替代原始林木材。
The density, shrinkage coefficient and various mechanical strength indexes of five large-volume secondary woods (Tilia amurensis, Fraxinus mandshurica, Mongolian oak, Populus davidiana and Betula platyphylla) in the secondary forest in Northeast China were tested and compared with the northeast The corresponding index of the same species of virgin forest was compared and analyzed. The results showed that the radial growth of secondary forest was 53.1% higher than that of virgin forest, and the mechanical indexes were almost the same as that of virgin forest, only the dry shrinkage coefficient was slightly higher than that of virgin forest, but the difference of dry shrinkage of secondary forest was insignificant. It can be assumed that the use of secondary tree timber through mature trunk trees can completely replace the original forest timber.