摘要
1986年李明鹤把林木改良区分为个体改良与群体改良,并在此基础上提出了采用无性系选择法,分两步迅速实现杉木良种化的方案。从1986年起,经三年的实验,现已完成了第一步,并研究出了建立采穗圃的新技术,它有助于使我国杉木造林迅速实现良种化。现将研究的结果报道如下。
A hedged orchard for cutting production of Chinese fir (Cunninghamia lanceolata (Lamb.) Hook. ) occupying 0.80ha. has been established since 1986. 31, 000 seedlings originated from desired provenances, families and seed orchards were planted in the orchard as donors. The orchard is unique to the existing ones found in the literature due to the fact that no main stems can be seen, while shoots come up from the stems lying underground and are also collected from the cuttings underground. Experiments showed that the number of the cuttings produced in 1m^2 of the orchard area was about 270 in the second year and 470 in the third year of the establishment. This means that the number of the rooted cuttings yielded in a given hedged orchard area is double or even triple the number of the seedlings produced in the same area of a seed orchard at the highest yielding age of 10 years.
An average of 90% rooting survival rate in practice was obtained with no shading, no irrigation and no hormone treatment. No damping-off disease was found. Both average height and diameter at the root collar were larger in the rooted cuttings than in the seedlings of the same age. About 230 000 rooted cuttings, whose expected genetic gain would be equal to that of the original stocks were produced in the past two years, and 600 000 propagules are now growing in the nursery beds. The cost of a rooted cutting was 20% lower than that of a seedling.
The techniques for cstablishing a hedged orchard, and the efforts to obtain high yields of shoots and to reduce the cost are also recommended in this paper.
出处
《林业科学》
EI
CAS
CSCD
北大核心
1990年第4期363-367,共5页
Scientia Silvae Sinicae
关键词
杉木
林木改良
苗木
育咱
Cunninghamia lanceolata (Lamb.) Hook
Forest tree breeding
Forest tree improvement
Hedged orchard
Clonal selection
