论文部分内容阅读
钻天榆是河南白榆中的一个速生类型。它树干通直、圆满,高生长迅速,被誉为钻天榆;又因树冠较窄,枝条向上斜立,又被称为立枝榆。由于它生长快,耐干旱,抗盐碱,材质好,广群众十分喜爱它。 近几年,新疆农垦系统从河南省孟县、温县等地引进大量钻天榆种子和实生苗,在南北疆9个垦区播种繁殖,建立母树林,同时采用各种措施进行优选,取得了显著成效,己将它用于营造农田防护林和用材林。 一、钻天榆的特性 钻天榆同白榆一样,喜光,但主干性较
Drilling sky elm in Henan elm in a fast-growing type. Its trunk straight, successful, high growth rapidly, known as drilling sky elm; also because of the narrow canopy, branches oblique upright, also known as standing elm. Because of its rapid growth, resistance to drought, salt and alkali, good material, the broad masses love it very much. In recent years, Xinjiang Land Reclamation System has introduced a large number of seeds and seedlings of Castanopsis glauca from Mengxian County and Wenxian County of Henan Province, sown and multiplied in 9 reclamation areas of North and South Xinjiang, set up the mother tree forest and adopted various measures to optimize and obtain Significant results have been used to create farmland shelterbelts and timber forests. First, the characteristics of drilling sky elm Sky-elm drill with the same elm, hi light, but the main dry