Method for breaking through multiple impervious layers of difficult afforestation soil

Abstract

The invention discloses a method for breaking through multiple impervious layers of difficult afforestation soil. The method comprises the following steps of A, leveling a land parcel to be afforestedaccording to the terrain; B, determining planting ditches on the levelled land according to the types of trees or shrubs to be planted; C, determining the positions and the number of poles of the planting ditches; D, mechanically punching impervious layers to form vertical holes; E, filling sand back into the vertical holes and compacting the sand, and mounting filtering tubes as into a part of the vertical holes as observing holes; F, periodically observing the water level change in the vertical holes. The method for breaking through the multiple impervious layers of the difficult afforestation soil is based on engineering physical measures to break through the impervious layers of difficult afforestation underground soil to form a mesh shape, so that rainwater or upper underground waterformed by irrigation can be displaced downwards to reduce the content of salt and alkali in soil of an afforestation arable layer, reach the critical depth of underground water and avoid death of afforestation seedlings due to secondary salinization caused by irrational irrigation. The method for breaking through the multiple impervious layers of the difficult afforestation soil is low in cost, easy to operate, rapid in effect, good in desalination effects and capable improve the seedling survival rate.

Description

technical field [0001] The invention relates to the field of forestry artificial afforestation, in particular to a method for breaking the soil impermeable layer of a difficult afforestation site. Background technique [0002] Domestic scholars such as Tian Changyan reported that under the coexistence of impermeable clay layer and sand layer in the soil, subsoiling plows were used to subsoil the clay layer and discharge irrigation water laterally through the sand layer into the drainage system to achieve the purpose of improving the soil. The method is only suitable when the distribution depth of the impermeable sticky board layer in the soil is 80-120cm, and the thickness is between 10-30cm. Shang Xin et al. used blasting to break the impermeable layer in the arid irrigation area of ​​Northwest China, and washed the saline and alkali in the soil with fresh water after blasting. There are land plots with impermeable layers in the deep layer of the ground, and there are prob...

AI Technical Summary

Problems solved by technology

Wang Sheng and others used the method of drilling vertical wells, placing drainage pipes and forced drainage equipment to pump out underground water or irrigation water in saline-alkaline land improvement. This method requires intensive drainage and equipment, and the equipment is expensive, so it is not suitable for large-scale promotion.

The traditional method of subsoiling, digging wells, and even underground blasting cannot penetrate the impermeable layer effectively and comprehensively. The surface submerged water and soil salt accumulate in the soil, causing the soil to be in a state of long-term water accumulation and salt accumulation, resulting in unusable land

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