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为了加速种子萌芽,改善幼苗生长条件,近年来芬兰创制了一种直播后复盖塑料罩的造林方法,简称盖罩直播法。这种方法最适用于立地条件差或经过排水的沼泽地的造林。在直播后,用特制的播种杆,把塑料罩盖在播种点上。塑料罩呈角锥形,起小型温室的作用,可以加速种子萌芽和生长。造林几年后,塑料罩即告破损消失(图1),因此对林地没有污染作用。这种方法主要有如下优点。①罩内小区气候条件比外界适合,种子萌芽快,扎根容易,生长迅速; ②可以调节气候,防止酷热、干旱、寒冷等极端气候的影响; ③防止鸟、虫和啮齿动物的为害; ④节省种子; ⑤操作简易迅速; 盖罩直播法的操作过程分播前准备、调整下种量、播种三个阶段,具体步骤如下。
In order to speed up the seed germination and improve seedling growth conditions, in recent years, Finland has created a direct-seeded plastic cover afforestation method, referred to as cover live broadcast method. This method is best suited for afforestation in poor wetlands or drained marshes. After the live broadcast, with a special planting rod, the plastic cover at the planting point. Plastic cover is pyramid-shaped, play a role in the small greenhouse, can accelerate the seed germination and growth. After a few years of afforestation, the plastic cover disappears and disappears (Figure 1), so it has no pollution to the woodland. This method has the following main advantages. ① climate within the enclosure area than the outside world for suitable climatic conditions, seeds sprout fast, easy to take root, rapid growth; ② climate can be adjusted to prevent heat, drought, cold and other extreme climate effects; ③ prevent birds, insects and rodents; Seed; ⑤ easy and quick operation; cover live broadcast method of pre-broadcast sub-prepared to adjust the amount of planting, sowing three stages, the specific steps are as follows.