Brief introduction of technical characteristics of aerial seeding afforestation

The application background of aerial seeding afforestation technology is to sow trees (grass) on the land suitable for sowing in the deep mountain area suitable for aerial seeding. According to the characteristics of natural regeneration of forest trees, with the help of natural rainfall and suitable temperature, seeds can take root and sprout into trees, thus expanding forest resources and increasing forest vegetation. The economic, ecological and social benefits of aerial seeding afforestation technology in forestry construction are very obvious, especially as an important means to expand and improve vegetation. Compared with artificial afforestation, aerial seeding afforestation technology has the following characteristics: (1) The construction speed is fast, which saves labor and effort, and can complete large-scale afforestation tasks in a short time. Each plane can sow 2667 ~ 3333 hm2 in 1 flight days, which is equivalent to the afforestation area of 5000 working days. (2) The coverage is wide, and it can go deep into remote mountainous areas with few people and difficult artificial afforestation; (3) Low construction cost and less investment. For more than 40 years, the average direct investment in aerial seeding afforestation in China is 1.25 yuan /hm2, and the later management cost is 2 1.50 ~ 300 yuan /hm2, which is about 20% of plantation investment. (4) Mixed planting of multiple tree species can form a mixed forest at one time, which is beneficial to improve the local ecological environment; (5) There are many departments involved and strong collaboration. Aircraft broadcasting is a comprehensive greening work composed of many departments and disciplines. In addition to forestry and flight departments, meteorological, communication and transportation departments must also work closely together.

Problems and solutions of aerial seeding afforestation technology 4. 1 Single tree species and poor stand stability. Most aerial seeding forests in China are still dominated by pure forests. The increase of pure forest area: on the one hand, it is easy to lead to pests and diseases and forest fires; On the other hand, the two benefits of forestry cannot be brought into full play. Therefore, the proportion of mixed forests should be increased according to the principle of suitable land and suitable trees. 4.2 The management of aerial seeding forest is relatively backward. With the in-depth development of aerial seeding afforestation, the area of large barren hills is gradually decreasing, and the woodland suitable for aerial seeding afforestation is also gradually decreasing. The focus of work should be shifted from aerial seeding afforestation to aerial seeding forest management. 4.3 Management and protection funds are insufficient, and it is difficult to implement management and protection measures in sowing areas. Sowing area is large and mostly distributed in remote mountainous areas, but the economy in remote mountainous areas is relatively backward and there is not enough financial resources to invest in management and protection. 5 Prospect China is a Shaolin country, with a per capita forest area of only 0. 128hm2, which is only 2 1.3% of the world's per capita forest area of 0.6hm2 Through aerial seeding afforestation technology, the forest coverage rate in remote mountainous areas and desert hinterland of China has been improved, and good ecological benefits have been brought into play. In recent years, the relevant research work of aerial seeding afforestation technology has also made good progress, and China's aerial seeding afforestation technology has reached the international leading level. However, there is a large area of barren hills and wasteland suitable for forest in China, and the task of improving forest coverage in the future is a long way to go. Aerial seeding afforestation is still one of the important means of afforestation in the future.