我国森林面积很少,只占总面积的12.0％。飞播是高度机械化的绿化手段,速度快,成本低,省劳力,效果好。为加快绿化步伐在大面积荒山、荒地、沙区人口稀少之地可大面积推广。我国飞播造林每年约一千多万亩。要使飞播发挥更大的作用,必须掌握好适宜的播种期。在播区,植物种确定后,适宜飞播期就是成苗好坏的关键。播种过早过晚,都会因水分不足或气温不够而延长种子发芽时间,从而增加了鸟、鼠类的危害,或因温度过高而降低发 China’s forest area is small, only 12.0% of the total area. Aerial broadcast is a highly mechanized afforestation, fast, low cost, labor-saving, effective. To speed up the pace of afforestation in a large area of ​​barren hills, wasteland, sand sparsely populated areas can be large-scale promotion. China’s aerial seeding every year about more than 10 million mu. To make the aerial seeding play a greater role, we must master the appropriate seeding period. In the broadcast area, plant species identified, the appropriate stage of seeding is the key to good or bad seedlings. Sowing too early, will be due to insufficient water or temperature is not enough to extend the seed germination time, thereby increasing the birds, mice or harm, or because the temperature is too high and reduce the hair