Sand dune top gathering afforestation method

Abstract

The invention provides a sand dune top gathering afforestation method. The method comprises the following steps of 1, dividing the top of a sand dune into a plurality of planting units, and predetermining whether mechanical sand barrier sand stabilization treatment is performed on the planting units or not according to the wind speed; 2, during spring afforestation, after accumulated snow melts, digging a tree pit in each planting unit, planting a plurality of robust and qualified nursery stocks in each tree pit, and setting an interval of 7-12 cm between every two adjacent planted nursery stocks; after the nursery stocks are placed, backfilling the tree pits with a mixture of bentonite and wet sandy soil, and performing trowelling and compacting; and 3, determining whether newly planted nursery stocks in the planting units are watered or not according to the suspended wet water content of the shallow sandy soil at the top of the sand dune. The gathering pattern of haloxylon ammodendron under the wind erosion condition is fully utilized, so that the positive interaction is increased, namely the mutual benefit effect is improved; and meanwhile, the water retention capacity of the suspended wet sand layer is utilized, so that the afforestation survival rate of the top of the sand dune is increased, the sand dune is prevented from moving, and vegetation recovery on arid desertification land is promoted.

Description

technical field [0001] The invention relates to the technical field of sand dune top restoration of desert vegetation, in particular to a sand dune top aggregation afforestation method. Background technique [0002] The Gurbantunggut Desert is located in the hinterland of the Junggar Basin. Affected by closed terrain and atmospheric circulation factors, it has formed a typical continental temperate desert climate with an annual average temperature of 5°C-5.7°C and an extreme maximum temperature of over 40°C. The extreme minimum temperature is less than -40°C, the annual evaporation is 2000-2800mm, the annual sunshine hours are 2700-3100 hours, the frost-free period is 135-150 days, the annual relative humidity is 15%-60%, and the annual rainfall is 80-160mm, of which The precipitation in spring and summer accounts for about 65% of the whole year. In addition, there is stable snow on the surface in winter. After melting in spring, a 50-60cm thick suspended wet sand layer is f...

AI Technical Summary

Problems solved by technology

[0005] For afforestation on the top of dunes, because the traditional technical method does not consider or understand the relationship between wind speed and the distribution pattern of Haloxylon, it has not been solved or it is difficult to solve the problem of afforestation on the top of dunes, so that dune movement often occurs, which seriously affects the oasis ecological security, the previous method of afforestation not only wastes a lot of manpower, material and financial resources, but also hardly achieves the expected effect

In addition, the afforestation in the Gurbantunggut Desert is mainly Haloxylon genus, and the method of planting seedlings by digging tree pits for a single plant is adopted. This method still has a certain survival rate on the windward slope and between the hills or on the leeward slope. Due to severe wind erosion in single-plant seedling afforestation, it is difficult for Haloxylon seedlings to survive; in addition, the root system of Haloxylon is shallow at the seedling stage, and the ability to resist wind erosion is weak, which will cause the death of Haloxylon seedlings