1年生楸树无性系苗期生长特性

楸树(Catalpa bungei C.A.Mey.)为紫葳科(Bignoniaceae)梓树属(Catalpa Scop.),原产我国,适应性强、分布范围广、栽培历史悠久,至今已有2 600年,是我国传统栽培的珍贵优质用材树种和著名园林观赏树种,喜温暖湿润,适生于年均气温10～15℃,年降水量500～1 000 mm的气候条件.楸材作为优质上等木材可以满足国内对高级木材的需要,缓解上等材供不应求的矛盾.

Growth Traits of One-Year-Old Catalpa bungei Clones in Seedling Stage

In order to study the growth traits of Catalpa bungei clones in various growth periods during the nursery stage so as to provide a theoretical basis for genetic improvement, the authors matched the height and diameter in nursery stage by Logistic equation. The results showed that the mean height of clones was 325.19 cm, with the range of 253.48-402.88 cm, the mean basal diameter of clones was 4.29 cm, with the range of 3.61-5.05 cm. The height increment could be divided into two stage, i.e. the early-growing period and the fast-growing period, while the basal diameter increment could be divided into three stage, i.e. the early-growing period, the fast-growing period and the late-growing period. The beginning of fast-growing period, the end of fast-growing period, the duration of fast-growing period, and the daily mean height increment in fast-growing period were May 26-July 2, September 11-October 15, 72-128 days, and 1.70-2.88 cm, while that for basal diameter increment were May 9-June 5, August 23-October 3, 95-138 days, and 0.021-0.032 cm. The variation of traits in fast-growing period was more significant. The height and basal diameter were significantly correlated to their increments in early-growing period (0.744, 0.928), fast-growing period (0.965, 0.804), and their daily mean increment in fast-growing period (0.733, 0.811).