通过闽中山地 2 1～ 2 2年生的湿地松、火炬松、马尾松生长过程的研究表明 :在一般经营条件下 ,湿地松 2 1年生材积可比马尾松高 2 3 8% ,火炬松介于湿地松与马尾松之间。国外松胸径、树高在 8年生前为速生期 ,材积在前 14年生为速生期 ,持续时间短 ,18～ 2 0年生达数量成熟。马尾松的胸径速生期在 14年生 ,高生长的速生期在 14～ 16年生 ,材积在 2 0年生为速生期。 The growth of Pinus elliottii, Pinus taeda and Pinus massoniana from 21 to 22 years old in the mountainous area of ​​Minzhong showed that the annual volume of 21-year-old Pinus elliottii was 23.8% higher than that of Pinus massoniana under normal operating conditions, Between pine and masson pine. Abroad, the diameter of pineapples, tree height in 8 years ago for the fast-growing period, the volume of the first 14 years of life as a fast-growing period, duration is short, 18 ~ 20 years the number of mature. Pinus massoniana DBH fast-growing period of 14 years, high growth period of 14 to 16 years old, volume in 20 years as a fast-growing period.