杉木第2代种子园效果分析

调查分析了广东龙山林场杉木第2代种子园母树生长、结实情况和种子播种品质及2代园子代测定与现实增益等．结果显示：嫁接6～8年,2代园母树保存率74．39％,正冠率87．65％,母树生长正常．结实株率50．45％,单株结实指数1．52,母树结实力中下。球果出籽率、种子千粒质量、发芽率和发芽势分别为3．24％、6．554g、31．74％和23．16％,种子播种品质总体上优于同龄初级种子园,但劣于1．5代种子园．来自广东、广西的建园亲本,在结实力及子代速生性方面均优于来自福建、贵州、湖南的亲本．4年生子代测定结果表明,2代园材积现实增益7．58％～10．60％,建设2代园提高种子遗传品质的关键目的已实现,广东龙山2代种子园营建基本上是成功的。

Study on the Effects in the Second-Generation Orchard of Cunninghamia lanceolata

The growth and seeding situation of parental trees, the seed quality of sowing, the performance of progeny and the practical gains for the second-generation orchard were assessed. The results were summarized as follows. In 6 to 8 years after graft, the remaining rate of trees in the second-generation seed orchard was 74.34% and the rate of straight trunk was 87.65%. Trees in the orchard have grown well. Rate of seeding trees was 50.45%, and cone production index was 1.52. The seed rate of cone was 3.24%. The thousand-grain mass was 6.554 gram. The germination rate was 31.74%, and the germination capacity was 23.16%. The quality of sowing of the seed in the second-generation seed orchard was higher than those in the first-generation orchard with the same age, but was lower than those in the 1.5-generation orchard. The parents from Guangdong and Guangxi are better than those from Fujian, Guizhou and Hunan according to their seeding ability. The results from 4-year-old progeny tests indicated that the practical gain of volume in the second-generation seed orchard was 7.58%-10.60%, and the key targets of developing second-generation seed orchard and improving genetic quality of seeds were realized. The establishment of the second-generation seed orchard in Longshan state-own forest farm was basically successful.