Double-layer spray-seeding method of alien soil matrix and water-retaining agents for recovering rock slope vegetations

Abstract

The invention discloses a double-layer spray-seeding method of an alien soil matrix and water-retaining agents for recovering rock slope vegetations. Firstly, a basic layer is sprayed and seeded on the surface of a rock slope and contains a starch grafting acrylate slow-releasing water-retaining agent, and the water-retaining agent comprises, by mass, 23-29 parts of starch, 60-66 parts of acrylate, 12-15 parts of water and 0.5-1.0 part of cross-linking agent. Then, a vegetation layer is sprayed and seeded on the basic layer and contains a polyacrylamide quick-releasing water-retaining agent, and the polyacrylamide quick-releasing water-retaining agent comprises, by mass, 45-48 parts of acrylamide, 38-44 parts of potassium acrylate, 7-9 parts of water and 0.5-1.0 part of cross-linking agent. The double-layer spray-seeding method can effectively improve germination rate and uniformity degree of shrub and grass seeds at a spray-seeding initial stage under the rainfall-free condition in the rock slope alien soil landscape engineering and is simple and is high in landscape engineering success rate.

Description

technical field [0001] The invention relates to a spraying method of guest soil for vegetation restoration, in particular to a double-layer spraying method of guest soil matrix and water-retaining agent for vegetation restoration on rock slopes. Background technique [0002] A large area of ​​northern China has an arid climate and little rainfall. For rocky slopes, due to the special site conditions of the slope, the actual water intake of the slope is significantly smaller than that of the flat land, usually only 30% to 60%. Exacerbated the loss of soil moisture. Therefore, it is very difficult to restore vegetation on rocky slopes. The most fundamental reason is that the problem of water retention and supply on the slope surface to meet the needs of plant growth cannot be solved. [0003] The rock slope vegetation restoration of prior art mainly solves this problem through the following three ways: [0004] 1. To expand the amount of soil stored on the slope, such as in...

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Problems solved by technology

[0004] 1. To expand the amount of soil stored on the slope, such as increasing the soil thickness of guest soil spraying, artificially digging holes, anchoring and tying piles to make roughness, etc. This type of method obviously ignores the stability of the topsoil under the slope conditions, and the natural state The soil on the slope that has been increased blindly is likely to be lost again within 1 to 2 years, and disasters are likely to occur in case of heavy rain;

[0005] 2. Use water retaining agent. In the past, the base material and water retaining agent were mixed and used at one time. The type of water retaining agent is usually quick-release water retaining agent. The short-term effect is obvious, but the secondary water absorption efficiency is very low. The biggest problem is that this will directly lead to The superficial 3-4cm water-retaining agent quickly oxidizes and fails, wasting costs;

[0006] 3. Artificial watering and maintenance, which is the most primitive method, can only be used conditionally in a small area, but it cannot be carried out on a large scale in vegetation restoration projects on rocky slopes such as highways and high and steep mines, and there are also trial slopes Surface sprinkler irrigation facilities, but there are generally problems of high maintenance costs and huge water consumption

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