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林分密度管理图是以林分密度效应规律为理论基础,由密度(即单位面积上林木株数)与各测树因子(如直径、树高、材积等)新建立的数学模型编制而成。它是林分经营的重要工具,可为定量间伐、资源调查、生长予测、造林设计等工作提供依据。本图中的欧美类杨树,主要是沙兰杨、Ⅰ—214、健杨等无性系,是我市汶河沿岸主要造林树种。本文在搜集大量标准地材料基础上,编制了该类树种林分密度管理图供试用。
The stand density management chart is based on the stand density effect law as the theoretical basis, and is compiled from the newly established mathematical models of density (ie, the number of trees per unit area) and each tree measure (eg diameter, tree height, volume, etc.). It is an important tool for forest management, which can provide basis for quantitative thinning, resource investigation, growth prediction and afforestation design. In this picture, the poplar trees in Europe and the United States are mainly the clones of Sallam, I-214 and Jiangyang, which are the main afforestation species along Wenhe River in our city. Based on the collection of a large number of standard materials, this paper compiled the tree species stand density management chart for trial use.