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一、问题的提出蓝桉是滇中及川西地区引种成功的生长最快经济价值较高的速生树种。但其树干和木纹常多弯曲扭转,对其锯材的使用价值影响较大(对原木影响较小)。根据我们调查的材料,少数地区,按林分平均,其树干的扭转纹有高达122%者(即在树干一公尺长的距离内,木纤维的走向沿着树干的轴心绕了一圈多),具扭转纹植株的比率,占全林分80%以上,这样,就大大地降低了木材的利用价值,这是目
First, the issue raised Eucalyptus is the introduction of Yunnan and western Sichuan region the fastest growing fastest growing economic value of fast-growing tree species. However, its trunk and wood often bend and twist, the use of the sawn timber greater value (less impact on the logs). According to the data we surveyed, in a few areas, up to 122% of the twisting patterns of tree trunks are averaged according to stand (ie, at a distance of one meter from the trunk, the wood fibers go around a circle along the axis of the trunk More), the ratio of twisting plants, accounting for more than 80% of the whole forest, thus greatly reducing the value of the use of timber, which is the head