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贵州省龙里林场,始建于1957年,是以营造马尾松为主的用材林场。27年来已造马尾松林近十万亩,现大部为中成林,生长良好,每亩平均蓄积量为5.6m~3,年平均生长量0.4m~3,有的林分即将主伐。为了选择马尾松采伐后的更新树种,从1973年起,先后五次引进火炬松和湿地松种子育苗造林,并与马尾松进行对比试验。现已造国外松林450多亩,多数幼林均已郁闭。74年造的湿地松,现平均高9m,平均胸径14.1cm,年均高生长0.9m,年均径生长1.4cm,生长量比马尾松将近大一倍,个别株已开花结实。
Longli Forest Farm in Guizhou Province, was founded in 1957, is based on the construction of timber-based timber plantation. In the past 27 years, nearly 100,000 mu of Pinus massoniana forest has been built, most of which are in mature forests. The average volume of acreage per acre is 5.6m ~ 3 and the average annual growth is 0.4m ~ 3. In order to choose the newer species of P. massonotus after logging, from 1973 onwards, the seedlings of Pinus taeda and Pinus elliottii seedlings were introduced five times and compared with that of masson pine. Now 450 acres of foreign pine forests have been made, most of the young trees have been closed. Slash pine made in 1974 is an average height of 9m, an average diameter of 14.1cm, an average annual growth of 0.9m, the average annual growth of 1.4cm, growth is almost double the massoniana, individual plants have flowering and fruiting.