这是和角规测树的原理相似的方法,没有固定的样圆边界,只记录符合规定的树木,减少了逐一查数样圆内全部幼树的麻烦,节省了调查时间。因此,最适宜更新路线踏查、生态地植学和资源清查中附带进行的更新调查。一、原理1.样木的计数如图1所示,凡树高超过与地面成45°倾角的锥面的幼树即算样木,正好与锥面相切的为边界木,按半株计算,其它不予计数。 This is a method similar to the principle of angle measurement tree. Without fixed sample circle boundaries, only the trees complying with the regulations are recorded, which reduces the trouble of searching all the saplings in the circle one by one and saves the investigation time. Therefore, it is most appropriate to update the updated surveys carried out along the route, eco-vegetation and resource inventories. First, the principle 1. Sample wood count shown in Figure 1, where the tree height above the ground into a 45 ° angle of the taper of the sapling that is kind of wood, just as the border with the conical taper wood, calculated by half a plant , Others do not count.