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森林立地质量评价是研究森林生长和确定各种森林经营措施的一个重要问题。 当今常用的地位级表和地位指数表都存在一定的缺点和局限性。如地位级表受森林经营措施(尤其是扶育间伐)的影响,地位指数表在没有收获表的情况下很难给人以比较清晰的优劣概念。 本文从树高曲线广义数学模型概念,分析它们的实质,研究结果表明地位级表和地位指数没有本质的区别。 因此,提出了一种以标准年龄优势木平均树高相对级别评价森林立地质量的方法。称为改进的地位级表。这种方法兼有地位级表和地位指数表两者的优点,既反映出立地质量的相对概念,便于生产经营单位使用,又具有比较稳定,适应性比较广的优点。 本文探讨编制该改进的地位级表的理论和方法,并用IBM-PCl×T微机和SR6602绘图仪建成称之为NTSCT计算机软件系统。
The quality assessment of forest sites is an important issue for studying forest growth and determining various forest management practices. There are some shortcomings and limitations in today’s commonly used status level and status index tables. Such as the status of the table by the forest management practices (especially fertile thinning) impact, status index table in the absence of income table is difficult to give a clear concept of advantages and disadvantages. In this paper, the concept of generalized mathematical model of tree height curve is analyzed and their essence is analyzed. The results show that there is no essential difference between status table and status index. Therefore, a method of evaluating the forest site quality based on the average relative height of trees with standard age is proposed. Known as the improved status level table. This method combines the advantages of both the status level table and the status index table, which not only reflects the relative concepts of site quality, is convenient for production and business units, but also has the advantages of relatively stable and wide adaptability. This article explores the theory and method of compiling this improved rank table, and builds a computer software system called NTSCT with IBM-PC1 × T microcomputer and SR6602 plotter.