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海南五针松属松科松属,主产海南,1977年在通道县坪阳乡和大高平乡首次发现。我们对其生态条件及生长规律作了调查之后,1981年开始采种,1982年育苗,1984年栽植在海拔380米的本所,生长良好,7年生林分平均树高4.6米,胸径5.2厘米,优势木树高7.6厘米,胸径8.1厘米。原来生长环境为针阔混交林,海拔290米,南坡中部,板岩发育的红壤,原腐殖质中等厚度土层。解析木树龄109年,树高21.4米,胸径50.8厘米,材积1.838立方米,树
Hainan Pinus pine Pinaceae, Hainan, the main production in 1977, Pingyang Township, Channel County and the first high-found Pingxiang. After we investigated its ecological conditions and growth pattern, we started to plant seeds in 1981 and raised seedlings in 1982. When we planted the seedlings in 1982 and grown at a height of 380 meters in 1984, we grew well. The mean tree height of 7-year-old stands was 4.6 m and the diameter at breast height was 5.2 cm. Advantageous tree height 7.6 cm, diameter 8.1 cm. The original growth environment for the conifer and broad-leaved mixed forest, 290 meters above sea level, the central southern slope, slate developed red soil, the original humus medium thickness of soil. Analysis of wood 109 years old, tree height 21.4 meters, diameter 50.8 cm, volume 1.838 cubic meters, the tree