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一、问题的提出 马尾松（Pinus massoniana Lamb）分布广,生长快,适应性强,是我国荒山造林的先锋树种。为了迅速实现我省林木良种化,近几年来,我们进行了马尾松优树选择工作,并制定了《马尾松选优的标准与方法》,选优的方法是采用“五株大树对比法”。但在试行过程中,有很多不足之处,特别是选一株要实测六株树的高、胸径、中央直径,计算形率、形数、材积。由于目前缺乏方便而准确的仪器,测树高、中央直径都是采用人工爬树直接测量,选一株要爬六株,计算也很麻烦,选优的工作量很大,不利于群众性的选优活动。为了探讨比较简便、精确的选优方法及标准,我们对采用“五株大树对比法”调查的数据,进行了统计分析,初步提出了较为简便、精确的方法——三株大树胸径对比法。
First, the problem raised Pinus massoniana Lamb (Pinus massoniana Lamb) wide distribution, fast growth, adaptability, is the pioneer of afforestation in the barren hills of China. In order to quickly achieve the province’s tree planting, in recent years, we conducted a selection of superior tree masson pine, and developed a “Masson pine selection of the best standards and methods”, the best method is to use “five trees comparison method ”. However, in the pilot process, there are many shortcomings, especially the election of a tree to be measured six high, DBH, the central diameter, the calculation of the rate, shape, volume. Due to the current lack of convenient and accurate instruments, measuring tree height, the central diameter are measured directly by artificial tree-climbing, choose a to climb six strains, the calculation is also very troublesome, the great workload of the election, is not conducive to the masses Selected activities. In order to explore the simpler and more accurate optimization methods and standards, we conducted a statistical analysis on the data collected from the survey of “Five Tree Comparisons” and initially proposed a relatively simple and accurate method - comparison of the DBH of three trees law.