通过对来自广西 3个马尾松嫁接种子园 8份混系种的 4年造林对比试验 ,结果表明 ,种子园混系种在初期就表现明显的生长优势 ,材积的平均增幅度为 10 .9%～ 92 .8%。来自不同种子园的混系种之间的生长存在一定的差异 The results of the four-year contrast experiment on 8 mixed lines from three Pinus massoniana seed orchard in Guangxi showed that the mixed seed orchard showed obvious growth advantage in the early stage, and the average increment of the volume was 10.9% ~ 92 .8%. There are some differences in the growth of mixed lines from different seed orchards