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乔山林区全属天然次生林,栎、杨、桦约占70～80%,多数是慢生低产、质量差,年生长率仅为1～1.5%。二十年来,对此类林分进行了改造作业,效果明显。现报告如下。一、改造的林分类型及技术措施依据被改造林分现状、树种组成、立地条件、外貌特征、年龄阶段,结合动态方向,划分改造林分类型。按照不同类型,因林制宜、因地制宜,本着改造、利用相结合,采取综合性的营林和改造技术措施。(一)低产山杨林:呈团、片状分布,生长在梁脊或山梁上部的阳坡、半阳坡。中壤土,含沙礓,较干燥。树种组成为10杨、9杨1栎、8杨2桦、8杨1栎1杂等。林
Qiaoshan forest area belongs to natural secondary forest, oak, poplar, birch accounts for about 70 to 80%, most of them slow and low yield, poor quality, the annual growth rate of only 1 to 1.5%. In the past two decades, the improvement of such stands has been remarkably effective. The report is as follows. First, the transformation of the forest types and technical measures According to the status of the forest being transformed, tree species composition, site conditions, physical characteristics, age, combined with the dynamic direction, the division of forest types. According to different types, due to forest system, according to local conditions, in the transformation, the use of a combination of comprehensive forest management and transformation of technical measures. (A) low-yield mountain Yang Lin: was a group, flaky distribution, growth in Liangji or ridge above the sunny, half-Yang slope. Medium loam, sandy loach, drier. The tree species composition is 10 Yang, 9 Yang 1 oak, 8 Yang 2 Cheng, 8 Yang 1 oak 1 miscellaneous and so on. forest