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楸树是我国独有的速生珍贵用材树种之一,已有三千多年的栽培历史。地处陕西渭北黄土高原南缘的淳化县,楸树分布较为普遍,生长良好。因它分枝点高,主干明显、高大、通直圆满,树势雄伟,材质优良,不翘不裂,生长迅速,有“北方杉木”之说,曾与椿、榆、槐并列为关中平原的“四大金刚”,群众十分喜爱,栽培楸树的积极性很高。楸树播种育苗,一般情况下生长较慢,育苗周期较长,扦插育苗又较难成活,因其根部萌蘖力强,当前群众多采用埋根育苗或挖掘根蘖苗的办法来繁殖楸树,从苗木质量和数量上看,都不能满足造林的需要,加之砍得多,栽得少,资源不断地减少。为大力发展楸树,以解决苗木来源,我们于1981年开展了楸树塑料小棚播种育苗的试验研究。现将结果整理如下,以供参考。
Catalpa bungei is one of China’s unique fast-growing precious timber species, has more than 3,000 years of cultivation history. Located in Chunhua County, the southern edge of the Loess Plateau in Weibei, Shaanxi, Catalpa bungei distributes more commonly and grows well. Because of its high branching point, the trunk is obvious, tall, straight, round, magnificent trees, excellent material, not Alice not crack, rapid growth, there is “North fir”, with Chun, Ulmus, Huai as Guanzhong Plain The “Four Diamonds”, the masses are very fond of Catalpa trees planted with high enthusiasm. Catalpa bungei sowing seedlings, under normal circumstances, slower growth, longer seedling cycle, cutting seedling and more difficult to survive, because of its strong rooting ability, the current population of many rooted seedling or digging tillering seedlings to propagate Catalpa tree From seedling quality and quantity point of view, can not meet the needs of afforestation, combined with much cut, planted less, the resources continue to decrease. In order to develop Catalpa bungei, in order to solve the source of nursery stock, we conducted a pilot study on sowing plastic seedlings of Catalpa bungei in 1981. The results are now organized as follows for reference.