前几年,在杉木基地造林中,我们强调初植密度控制在167～240株(株行距 5×5、5×6、6×6)。这样的密度是否合理呢?我们对本县一九七二年以来营造的部份杉木林进行了调查。 五山林场东瓜廊林班一九七四年营造杉木林200亩,初植密度平均每亩326株。一九七八年底选标准地实测,平均胸径7.1厘米,平均高4.5米,每亩蓄积量4立方米,已郁闭, In previous years, in the afforestation of the base of Cunninghamia lanceolata, we emphasized that the initial planting density was controlled at 167 ~ 240 plants (spacing 5 × 5, 5 × 6, 6 × 6). Is such density reasonable? We surveyed some of the fir plantations built in our county since 1972. Wushan Forest Eggplant Langlin classes in 1974 to create 200 acres of Chinese fir forest, planting density average per mu 326. The end of 1978 selected standard measured, the average diameter of 7.1 cm, an average height of 4.5 meters, 4 cubic meters per mu volume, has been closed,