杉木立地指数表的编制,对了解立地质量的优劣,选择适宜的杉木造林地,拟定合理的经营措施,克服盲目性,增强科学性,将起到一定作用。一、编表资料的来源汉中地区马尾松、杉木栽培协作组,于1981年5—7月,在全区产杉木的8个县,按不同立地条件设置了49块标准地,伐取了30株优势木的解析木作为编表的原始资料。对萌生杉木和分蘖杉木分别绘制3龄树高曲线图,从中得到萌生杉木样木147个,分蘖杉木样木184个。按2年为一龄阶进行归类,分为14个龄阶,并对材料用2倍标准差进行筛选。除分蘖杉木两个低龄阶样本在限 The establishment of the CIF index table will play a certain role in understanding the pros and cons of site quality, selecting suitable sites for afforestation of cedar, formulating reasonable management measures, overcoming the blindness and enhancing the scientific nature. I. Sources of tabulated materials Masson pine and fir cultivation cooperative group in Hanzhong Region From May to July 1981, 49 standard areas were set up in 8 counties producing fir in the whole region, and 30 Strain wood analytical wood as the original source of the tabulation. The tree height curve of 3rd instar was plotted on sprouted fir and tillering fir respectively, and 147 spruce-fir-like wood and 184 tillering fir-like wood were obtained. According to 2 years for the first-year classification, divided into 14 age classes, and the material with 2 times the standard deviation screening. In addition to the two low-grade tillering fir samples in the limit