<正>以７个试验点１２年生马尾松种源试验林及２个试验点１１年生优树子代测定林为基础材料，在研究马尾松主要性状不同层次遗传变异的基础上，对马尾松制浆造纸材良种选育目标及在不同变异层次的选择策略进行了探讨。结果表明，马尾松制浆造纸材的良种选育应以材积和木材基本密度作为主要指标，首先进行种源的选择，在此基础上进行林分和个体的选择。种源选择以材积生长为主，不同的造林区应用不同的最适种源：分布区南部选用的优良种原来自该区域内；分布区中部选用的优良种源来自南部种源及中部区域内南部的一些种源；而分布区北部造林应选择分布区中部（特别是北纬 ２６．５～２８.0°区域内）的优良种源。林分选择仅以生长量作为主要指标。而材积和木材基本密度在林分内个体的选择中具有同样的重要性。

Genetic variations in different levels of masson pine (Pinus massoniana Lamb. ) in main traits were studied on the basis of the 12-year-old data of provenance tests at 7 test locations and the 11-year-old data of plus progenies at 2 test locations, and the index and strategy in different variation levels on selection breeding for pulpwood in masson pine was also discussed. The results showed that stem volume (V) and wood basic density (BD) were the most important traits in selection breeding for pulpwood of masson pine and, stand and individul selections shoud be based on the provenance selection. V was the first trait in provenance selection for pulpwood. There were different optimum provenances in different regions: the best provenances in the south of range were from the same regions the best ones in the middle of range were from the south of the same region and from the south of range; then the optimum ones in the north of range were from the middle of range (especially N 26. 5°～ 28. 0°). V could be regarded as the only trait in stand selection and both V and BD shoud be considered in individual selection within stand.