我场于一九六三年引进水杉,当时用少量的种子育苗,得到了一些苗木,一九六四年,由于种源缺乏,开始搞硬枝扦插试验,获得了成功,以后逐步扩大无性繁殖,一九七一年夏、秋两季,又试验嫩枝扦插,也取得了良好的效果。几年来,我们共培育了水杉苗400多万株,但水杉长期采用无性繁殖,也有一定的缺限。在十多年实践中,我们发现无性繁殖的水杉,随着年龄的增长,其总的生长势与抗病虫能力,都比定植的实生水杉苗差些,还发现无论采用老枝条、截干苗条或嫩枝条扦插,其成活率都有随母树年龄增大而下降的趋势。用种子育苗的一年生枝条摘嫩枝扦插,成活率较高,但用同一个母树进行多次重复扦插,其成活率也有逐渐下降和长势衰退的现象。 基于上述情况,为了进一步促进林业生产的发展,近些年来,在林业生产中,我们开始注意了林木良种的选育工作。一九七三年我们开始着手筹建水杉种子园工作,到目前为止,已初步建成30亩,58个无性系,共嫁接2540株,嫁接树生长良好,形势喜人。一九七三年嫁接的母树,个别植株已有雄球花和雌球果。一九七五年嫁接的,平均树高已达1.3米,最高达1.8米,已可取穗条繁殖。 My field introduced Metasequoia in 1963. At that time, some seedlings were raised with a small amount of seedlings. In 1964, due to lack of provenances, hardwood cutting experiments were started and they were succeeded. In the future, vegetative propagation was gradually expanded In the summer of 1971 and the autumn of two seasons, we tested the shoot cutting and achieved good results. In recent years, we have cultivated a total of more than 4 million metasequoia trees, but the long-term use of asexual reproduction of Metasequoia also has certain limitations. In more than a decade of practice, we found that asexual Metasequoia growth with age, its overall growth potential and resistance to pests and diseases, than the planted live Metasequoia seedlings worse, and found that regardless of the old branches cut off Slim or tender shoots cuttings, the survival rate with the mother tree age and declining trend. With seedling nursery annual shoots picking softwood cuttings, higher survival rate, but with the same mother tree repeatedly repeated cutting, the survival rate also gradually decline and growing recession phenomenon. Based on the above, in order to further promote the development of forestry production, in recent years, in forestry production, we have begun to pay attention to the breeding of forest seed varieties. In 1973, we started to set up the Metasequoia plantation. So far, we have initially built 30 mu and 58 clones with a total of 2540 grafts. The grafted tree is growing well and the situation is gratifying. The mother tree grafted in 1973, individual plants have male flowers and female cones. Grafted in 1975, the average tree height has reached 1.3 meters, up to 1.8 meters, it is desirable to breed.