马尾松优树子代家系生产力评价的研究

对６片１３年生马尾松优树子代家系测定林的研究结果表明，５～１３年生时其高、径和材积生长性状具有丰富的遗传变异，受中度以上遗传控制。年度间相关分析表明，对８年生以上马尾松优树子代测定林进行选择是可行的。利用材积指标作为丰产性测度对马尾松优树子代家系的生产力水平进行评价，从参试的２２９个家系中评选出１０３个材积大于群体平均值的家系，可作为一代种子园疏伐时留优去劣的依据；６０个材积大于群体平均值１５．０％的优良家系，利用其亲本无性系开展杂交育种工作；３４个材积大于群体平均值２５．０％的优良家系，可以直接在一代种子园中进行单系采种、造林，提高马尾松的经营效益。

Studies on the Productivity Evaluation of Plus Tree Progeny Families of Pinus massoniana

The study results of 6 plots of 13-year-old plus tree progeny family test plantations of Pinus massoniana demonstrate that the height,DBH and volume growth characters of 5 to 13-year-old progeny families possess rich genetic variations(under the moderate or high genetic control) The annual correlation analysis indicates that the selection is feasible for the plus tree progeny test plantations of P.massoniana above the age of 8 The volume index is used to be as the yielding ability measure to evaluate the family productivity level.Among 229 families tested,103 families whose volume is larger than the population average,60 excellent families whose volume increases by 15 0% over the population average and 34 excellent families whose volume increases by 25 0% over the population average have been selected to use for various breeding work in seed orchards and thus the management benefit of P.massoniana can be greatly raised.