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测量树径的工具一般是轮尺和围尺。轮尺的尺身长度要大于树干直径,且多需测量长、短径,取其平均值。用围尺测量大径木,一人难以操作,树干不为正圆时,精度便无保证。吉林省林科院副研究员赵彤堂发明的新式测径方法,不用卡,不用围,通过三点靠至树干便可测量出树径大小。测径靠尺由角度式尺臂、动尺、读数窗等组成。实际测量操作时,首先将两尺臂靠在树干上,再推动动尺使其顶端也靠至树干,
The tools for measuring tree diameters are generally calipers and rulers. Caliper ruler length to be greater than the trunk diameter, and more to measure long, short diameter, whichever is the average. With the foot to measure large-diameter wood, one difficult to operate, the trunk is not perfect, the accuracy is no guarantee. Jilin Province Academy of Forestry associate researcher Zhao Tong Tong invented new caliper method, without the card, not Wai, by three o’clock by the trunk can measure the size of the tree. Diameter by the foot by the angle-foot arm, moving feet, reading windows and other components. The actual measurement operation, the first two feet on the tree trunk, and then push the moving ruler so that the top also rely on the trunk,