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总结了６个测验年度，５～８年的１４９个火炬松自由授粉家系测验结果，表明家系间材积生长有显著差异．按水平表现法得５０分以上的系占４６％，它们的材积增益平均为１１１３％．按选择目的、用途及测验持续时间长短，将它们分为４组；结果还表明，不同来源的家系群优秀率不同，中选家系均优于任一对照，有力地说明选择改良的有效性
The results of 149 families of Pinus taeda pollination pollination in 6 test years and 5 ~ 8 years were summarized. The results showed that there was a significant difference in volume growth between families. According to the horizontal representation method, 50% of the above lines account for 46%, and their average volume gain is 11.13%. According to the purpose of selection, purpose and duration of the test, they were divided into 4 groups. The results also showed that the different sources of the excellent rate of different pedigrees, selected candidates were better than any of the controls, effectively explain the effectiveness of the selection of improvements