论文部分内容阅读
一、前言种子发芽快慢直接影响苗木生长期的长短,苗木大小,出栽时间和抗性大小。例如:落叶松,樟子松苗木出土早,抗立枯病能力就强。林木种子育苗中;为了获得较高的发芽率和较好地发芽势,生产上总是将种子进行催芽处理;其催芽时间长短,催芽温度高低及催芽方法因不同种而异;一般说来可分为被迫休眠种子催芽及生理休眠(深休眠)种子催芽二类;后者由于胚发育不全,胚及胚乳物质转化未完成,激素不平衡等等原因;而前者催芽较易。目前林业生产中,凡主要造林树种,已取得一套成熟的催芽经验。随着林业的不断发展造林树种也不断地增加,不
First, the introduction of seed germination speed directly affects the growth of seedlings length, seedling size, planting time and resistance size. For example: Larch, Pinus sylvestris seedlings unearthed earlier, the ability to resist blight is stronger. In order to obtain higher germination rate and better germination potential, the seed is always germinated in production. The duration of germination, the temperature of germination, and the germination method vary according to species. In general, Divided into forced dormancy seed germination and physiological dormancy (deep dormancy) seed germination two; the latter due to embryonic hypoplasia, embryo and endosperm transformation is not complete, hormone imbalance and so on; and the former germination easier. At present, forestry production, where the main afforestation species, has achieved a set of mature germination experience. With the continuous development of forestry afforestation species also continue to increase, no