【摘要】 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。更多还原

【Abstract】 The paper describes an experiment, five broad-leaved woods (Tilia amurensis, Fraxinus mandshurica, Quercus mongolica, Populus davidiana, Belula platyphylla) with a larger amount of yield of secondary forest in Northeast area have been tested and the density, coefficients of shriknage and several mechanical strength indexes have bean determined. Meanwhile the authors compared the result of experiment with that of origin forest. It showed that the radial growth of secondary forest is about 53.1％ larger than that of oirgin one. However the values of several mechanical strength indexes are very similar, but only the coefficients of shrinkage is somewhat larger. Therefore, we considered that the straight wood of secondary forest can substitute the wood of onigin forest completely.更多还原