1958年中国林业科学研究院林业科学研究所森林经理经营研究室在角规测树方面取得新的研究成果。角规是一种极其简单的测树工具。用它来测定林地单位面积上的胸高断面积,不用对每棵树进行实测,只要通过工具,站在一点上,对周围的树木看一看就行了。在一般杉木或马尾松林中,花一分钟左右的时间,就能得出一公顷面积上所有树木的胸高断面积总和,而且精度合乎要求。用角规测定胸高断面积的方法原来是奥地利林学家比特里奇在1948年提出的,经许多国家的试验和应 1958 Forestry Research Institute of Chinese Academy of Forestry, Forest Management Operations Research Office in the angle measurement tree made new research results. Angle gauge is a very simple tool for measuring trees. Use it to determine the chest area of ​​forest land area, do not have to measure each tree, just by the tool, stand a little, take a look at the surrounding trees on the line. In a typical fir or masson pine forest, it takes about a minute or so to draw the sum of the chest and heights of all the trees on a hectare area, and the accuracy is satisfactory. The method of determining the area of ​​the thoracic area with the angle gauge was originally proposed by the Austrian forestryist Bittrich in 1948 and tested in many countries