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通过对17个美国火炬松种源和对照湖北火炬松的针叶性状分析表明,苗期3年生时,各性状变化大,5年后趋于稳定。针叶变异基本呈倾群变异模式。按针叶性状将美国火炬松种源分成3个区:西部和中西部内陆区,种源针叶长而重,抗旱性强;中部沿海及东南部气温高,种源不耐寒;东北部低温区,种源叶鞘长,耐寒性强。湖北火炬松可能是中西部偏南种源,抗旱性强而耐寒性弱。并分析了3针一束和4针一束在各区中的百分率。
The analysis of the needle-like traits of 17 American loblolly pine provenance and the control of Hubei loblolly pine showed that the traits of 3-year-old seedling varied greatly, and tended to be stable after 5 years. Coniferous variation was basically the pattern of crowd variation. According to the needle-leaf traits, the species of Pinus taeda were divided into three areas: the western and central and western inland areas, with provenances with long and heavy needles, strong drought resistance, high temperatures in the central coastal and southeastern regions, Low temperature, provenance leaf sheath long, cold and strong. Hubei loblolly pine may be south-central provenance in the central and western regions, with strong drought resistance and weak cold tolerance. The percentage of 3-pin and 4-pin bundles in each region was analyzed.