红椿优树子代苗期生长表现

为了奠定红椿遗传改良的研究基础，以湖南省20个红椿优树子代为研究对象，在湖南省桃源县进行育苗试验，对苗期生长指标进行调查，并对苗高、地径等性状进行统计分析。按20%的入选率，筛选出4个红椿苗期速生优良家系TC-5、TC-6、TC-12、TC-15。结果表明，4个红椿优良家系平均苗高为86.87 cm，比本次参试的20个家系平均苗高(74.85 cm)高16.1%，4个红椿优良家系平均地径为10.4 mm，比本次参试的20个家系平均地径(9.4 mm)高10.6%。家系间苗高、地径等性状均达极显著差异，说明红椿半同胞家系间存在较为丰富的变异，具选育潜力。然而，苗期表现不能代表整个树体成长的过程，只能为红椿优良家系选育的早期选择提供参考。

Seedling growth performance of Toona ciliata elite trees progeny

In order to establish genetic improvement research foundation of Toona ciliate, the author studied on seedling propagation of 20 Toona ciliate elite trees progenys of Hunan and investigated the growth condition of seedling height and ground diameter. After statistically analyzing, 4 fast-growing improved families in seedling period of of Toona ciliate were screened out based on selecting rate of 20%, those were TC-5, TC-6, TC-12 and TC-15. The average seedling height of 4 fast-growing improved families was 86.87 cm, which was 16.1% larger than that of whole 20 families with the figure of 74.85 cm. The average ground diameter of 4 fast-growing improved families was 10.4 mm, which was 10.6% larger than that of whole 20 families with the figure of 9.4 mm. There were extremely significant differences both in seedling height and ground diameter among families. It showed that there was good selecting and breeding potentiality among half-sib families for their abundant variation. However, the growth performance in seedling period could not demonstrate the growth law during whole life time but could help researchers finish early selection of selecting and breeding of Toona ciliate improved families.