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我国北方营造的人工林中,以落叶松面积最大,分布最广,将为国家提供大量的木材资源。但是,落叶松人工林中普遍发生心材变色和腐朽,变色率高达100%,对这一问题引起了生产、科研、教学等部门的重视,并组织人力开展了调查研究,提出各种解释。有人认为心材变色是心材腐朽现象,只是在各种不同林分中不同条件下,存在的程度不
In the artificial plantations built in northern China, the area of larch is the largest and the most widely distributed, which will provide the country with a great deal of timber resources. However, discoloration and decay of heartwood commonly occur in the Larix gmelinii plantation. The rate of discoloration is as high as 100%. This problem has aroused the attention of production, scientific research and teaching departments. It also organizes human resources to carry out investigations and studies and puts forward various explanations. Some people think that discoloration of heartwood is a decaying phenomenon of heartwood, but under different conditions in different kinds of forests, the degree of existence is not