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在我省的林业生产中存在这样的现象:云南松的树干纹理向左扭,蓝桉的树干纹理向右扭。这“两扭”使木材的冲击强度(弦向)显著下降,大大降低了木材的经济价值。随着林业生产的发展,改变“两扭”的现状,已迫在眉睫。云南松是云贵高原的主要针叶树种。它生长迅速,适应性强,耐干旱,因而成为荒山造林的先锋树种。在我省大面积分布于滇中高原和金沙江、南盘江流域;全省的125
In our province, there is such a phenomenon in the forestry production that the tree trunk texture of Pinus yunnanensis is twisted to the left and the trunk texture of the tree trunk is twisted to the right. This “twisting” significantly reduces the impact strength (chordwise) of the wood, greatly reducing the economic value of the wood. With the development of forestry production, it is imminent to change the status quo of “two writs”. Yunnan pine is the main conifer species in the Yunnan-Guizhou Plateau. Its rapid growth, adaptability, drought resistance, and thus become the pioneer tree afforested barren hills. In our province a large area is located in the Yunnan Plateau and the Jinsha River, Nanpanjiang River Basin; the province’s 125