据调查,我国自1958年开始飞机播种造林(以下简称飞播)以来,累计飞播面积达一亿七千万亩。保存面积约七千万亩,保存率约40％,占全国造林保存面积的15％。早期飞播的四川西昌、贵州黔南、广西梧州、广东惠阳等地区,已出现了几十万亩、上百万亩由飞播形成的云南松(pinus yunnanensis Franch)、马尾松(Pinus massoniana Lamb)用 According to the survey, since 1958, China began planting seeding of aircraft (hereinafter referred to as aerial seeding), its total area for aerial seeding has reached 170 million mu. Save an area of ​​about 70 million mu, the preservation rate of about 40%, accounting for 15% of the national afforestation preservation area. In the early days of sowing in Xichang, Sichuan, Qiannan in Guizhou, Wuzhou in Guangxi and Huiyang in Guangdong, there were hundreds of thousands of mu of pinus yunnanensis Franch and Pinus massoniana Lamb,