马尾松种源试验研究

Study of the Provenance Test of Pinus massoniana

马尾松是我国亚热带地区分布最广、资源最多的特有乡土树种.对参试的44个马尾松种源的树高、胸径、材积、枝下高和冠幅等生长指标进行了系统分析.结果表明:8年生马尾松种源试验林树高、胸径和材积生长差异显著,枝下高和冠幅生长无明显差异;树高、胸径和材积遗传力较高,分别为40.61%、39.53%和32.79%,枝下高和冠幅较低;聚类分析研究将马尾松种源分为极速生、速生和中等3种类型;综合评定的结果与聚类分析结果相符,确定了40号种源为最佳种源和33个可供采用的优良种源.

Pinus is a unique native species in the subtropical area of our country, whose distribution is broad and whose resources are rich. This article conducted a synthetic study of the tree height, diameter at breast height, stern volume, clean length and crown width of 44 provenances. The results show that the difference in the tree height, diameter at breast height and stern volume is remarkable in the 8-year-old provenance trial forest, but clean length and crown width show no obvious difference. The heritabilities of tree height, diameter at breast height and stem volume are rather high： respectively 40.61%, 39.53% and 32.79%, but those of clean length and crown width are rather low. A cluster analysis can divide Pinus massoniana provenances into 3 types ： the extremely fast-growlng, fast-growing and medium. The result from the synthetic evaluation is consistent with that of the cluster analysis, which determines that No. 40 provenance is the best provenance and there are altogether 33 fine provenances to be supplied.