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浙江省余杭县长乐林场1964年首次引种湿地松、火炬松和晚松,1975年后开始较大面积栽培,现有面积423.4公顷。引种第二代火炬松和晚松林分,生长良好。“三松”胸径、树高和材积随林龄的变化规律分别可用y=a+b1nx、y=a+bx+cx~2和y=a+bx回归方程来描述,相关紧密。“三松”生长量绝对值彼此尚存在差异,无论立地优劣、经营好差,都以火炬松生长最快,湿地松次之,晚松比湿地松略差。
Changle Forestry Farm of Yuhang County, Zhejiang Province introduced the pine planter, loblolly pine and evening pine for the first time in 1964. After 1975, large-scale cultivation began. The existing area is 423.4 hectares. The introduction of second-generation loblolly pine and late-stand, grow well. The variation of DBH, tree height and tree volume with forest age of “Songsong” can be described by the regression equation of y = a + b1nx, y = a + bx + cx ~ 2 and y = a + bx, respectively. The absolute value of the growth of “three pine” is still different from each other. Regardless of the merits of the site and the poor operation, the growth of the pine is the fastest, the second is the pine, and the later is easier than the pine.