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材积生长率表是测定林分生长量的主要尺度,为了预估近年内生长量的大小,及时掌握森林资源的消长动态和变化规律,我们利用在苏南低山丘陵地区调查收集的杉木生长锥测定样条资料,按材积差法试编了苏南杉木林分村积生长率表.一、资料的收集和来源在苏南各国营林场及有关乡村布设的杉木抽样样地之外,随机抽取离样点西南角最近的3株杉木样本进行调查.用轮尺测胸径(D~1)(精度0.1厘米),用生长锥在胸高1.3米处钻取直径生长量样条,量出最近5年年轮的宽度(L)(精度0.01厘米),并测定树皮厚(L)(精度0.1厘米).
Volume growth rate table is to measure the growth of the main measures stand, in order to estimate the size of the growth in recent years, to grasp the growth and decline of forest resources dynamics and changes in the law, we use the Southern Jiangsu Hilly area to investigate the growth cone Spline data were measured, and according to the volume difference method, the test was made on the plot growth rate of cumulus seedlings of the Southern China fir plantation I. Data collection and sources In addition to the sampling plots of Cunninghamia lanceolata collected from the forestry farms and relevant villages in southern Jiangsu, A survey of three Chinese fir samples closest to the southwestern corner of the sampling site was carried out using a caliper to measure the diameter at the breast (D ~ 1) (precision 0.1 cm) and the growth cone to drill the diameter growth spline at a height of 1.3 m, The annual ring width (L) (accuracy of 0.01 cm), and bark thickness (L) (accuracy of 0.1 cm).