火炬松是美国南方主要用材树种之一,我国引种有五十多年历史,引进的火炬松多属商品种子,产地不清,品质良莠不齐,导致林分和个体差异较大。为利用种源差异,探讨不同种源的遗传变异规律,摸清各种源的适应力,做到适地适权、适种源,以达到提高林分生产力的目的,1681年开展了火炬松种源试验研究。本文就5年研究的结果,对种源幼期变异及种源初步选择分析如下。 Loblolly pine is one of the main timber species in South America. Our country has introduced more than 50 years of history. Most of the introduced loblolly pine belongs to commercial seeds, whose origin is not clear and the quality varies greatly. As a result, the differences between stands and individuals are large. In order to make use of the difference of provenances, explore the law of genetic variation among different provenances, and find out the adaptability of various sources, so as to be suitable for adapting and adapting to different provenances, in order to achieve the goal of improving productivity of stands, in 1681, Provenance test research. In this paper, the results of five years of research, early seed germplasm variation and source selection analysis is as follows.