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在浙江省,营造杉木速生丰产林的高指标是“三个一”,即在整个轮伐期内,按年平均生长量计:树高1米、胸径1厘米,每亩材积1立方米。对于杉木人工林的生长发育过程,多数研究者又将其划分为幼林、速生、干材和成熟四个阶段。在幼林阶段,因苗木处于恢复时期,高和径生长比较缓慢,通常达不到年高生长1米的指标。1982年春,我们在富阳县金慈的红土丘陵地上营造了82亩杉木林,据1984年生长季结束后观测,平均树高达366厘米,即年平均高生长已达1.22米。在已发表的材料中,这片幼林的生长速度是领先的。
In Zhejiang Province, the high index of fast-growing and high-yield fir plantation is “three in one”, that is, the average annual growth rate during the whole rotation period is 1 meter in height and 1 cm in diameter at breast height, with a volume of 1 cubic meter per mu. For the growth and development of Cunninghamia lanceolata plantations, most of the researchers divided them into four stages: young forest, fast growing, dry wood and mature. In the young forest stage, because the seedlings are in the recovery period, the height and diameter growth is relatively slow, and the index of annual growth of 1 meter is usually not reached. In the spring of 1982, we built 82 mu of fir forest on the clay mound in Jinci, Fuyang County. According to the observation after the end of the growing season in 1984, the average tree was as high as 366 centimeters. That is to say, the annual average high growth has reached 1.22 meters. Among the published materials, the growth rate of this young forest is the highest.