火炬松在涟源地区自1974年引种以来,几年的生产实践证明,确实是一种适应性强,生长快,干形圆满通直的优良速生用材树种,深受群众欢迎。但是目前种源不足,为了加速繁殖,双丰县猪婆山林场科研小组进行了多种扦插试验。1978年12月5日,在二工区扦播火炬松250株,1979年9月20日检查,成活98株,成活率39.2％,新梢长一般5厘米左右,根系十分发达。从中挖取一株测定,主根两条,分别长42厘米和30厘米,侧根9条,须根密集。实验结果表明,火炬松冬季扦插已初获成功。插床选在西北向、沟坡中部,土壤是 Since its introduction in 1974 in Lianyuan area, the production of loblolly pine has proved that it is indeed an excellent fast-growing timber species with strong adaptability, fast growth and perfect stem shape. It has been well received by the public. However, at present, there are not enough provenances. In order to speed up the breeding, a variety of cutting experiments were carried out by the Scientific Research Team of Zhupanshan Forest Farm in Shuangfeng County. December 5, 1978, in the second division cuttings loblolly pine 250, September 20, 1979 inspection, survived 98, survival rate of 39.2%, the new shoot about 5 cm long, the root is very developed. A determination from digging, two main root, respectively, 42 cm long and 30 cm, lateral root 9, fibrous roots. The experimental results show that winter cuttings of Pinus taeda have been initially successful. Slotting election in the northwest, ditch central, soil is