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选择适宜的播期,是飞播造林一项重要的研究课题。飞播造林实践证明,播期适宜,种子能迅速发芽和出苗,成苗率高,能获得飞播造林成功;播期选择不当,往往影响飞播造林效果,甚至造成飞播失败。例如:1958年四川省西昌地区飞播云南松,失败的主要原因是播期选择太晚,幼苗生长期过短,未能木质化,造成越冬困难所致;1963年广东省阳江林场在2月上旬飞播马尾松,由于播期早,播后60多天未降雨,使
Select the appropriate sowing date, is an important issue of aerial seeding afforestation. The practice of aerial seeding afforestation proves that sowing date is suitable, the seeds can germinate and emerge rapidly, the seedling rate is high, and the success of aerial seeding afforestation can be obtained; improper sowing date often affects aerial seeding afforestation effect and even causes aerial seeding failure. For example: in 1958 Xichang, Sichuan Province, sowing Pinus tabulaeformis, the main reason for the failure is too late sowing options, seedling growth period is too short, failed to lignification, resulting in overwintering difficulties; 1963 Yangjiang Forestry Center in Guangdong Province in early February Fly sowing pine, due to sowing early, after sowing more than 60 days without rain, so