马尾松种源区内林分遗传变异及其阶段选择的研究

Study on Genetic Variation of Stands and its Stage Selection in Masson Pine Provenance Region

在福建马尾松优良种源区内，密集布点，选择林分，进行林分的遗传测定和分析。结果表明：马尾松优良种源区内林分间在树高、胸径、材积等调查性状上有着极显著的差异。树高、胸径、材积等生长性状的平均遗传方差分量为２６％，轮盘数具有较高的分量（７３．０６％）。１３个参试的初选林分，绝大多数比当地商品种长得快，在优良种源中再进行优良林分选择的材积、胸径、树高平均遗传增益分别为：４２．４７％、２０．４２％和１３．２１％。

In this paper,genetic determination of selected stands with design in high density which derived from excellent masson pine(Pinus massoniana)provenance region in Fujian Province indicated that there was a significant distrinction among survey characters in different stands auch as height, DBH and volume in this region.The mean genectic variance of height, DBH and volume reached to 26%,the variance of branch layer number was high (reached to 73.06%).Most of 13 selected experimental stands grew faster than local commercial stands.The mean genetic gains of volume, DBH and height of selected stands derived from excellent provenance region come to 42.47%, 20.42% and 13.21% respectively.