Coastal saline-alkali soil terrace type afforesting method for improvement of dredger fill

Abstract

The invention discloses a coastal saline-alkali soil terrace type afforesting method for improvement of dredger fill. The coastal saline-alkali soil terrace type afforesting method for improvement of the dredger fill comprises water seepage ditches, foundation terrain dredger fill, straw curtains, geotechnical cloth, improved planting soil, local models and the like, wherein square seepage ditches of the water seepage ditches are longitudinally excavated in the lowest position of the foundation terrain dredger fill, particle-size ballast stones are filled into the square seepage ditches, the distance between the foundation terrain dredger fill and the ground is 1-1.5m, the gradient of the foundation terrain dredger fill is 15 degrees to 30 degrees, straw is distributed on the foundation terrain dredger fill, the geotechnical cloth is laid on the straw curtains, and then the improved planting soil is laid on the geotechnical cloth. Due to the fact that the coastal saline-alkali soil terrace type afforesting method for improvement of the dredger fill is combined with the terrace type shape, the coastal saline-alkali soil terrace type afforesting method for improvement of the dredger fill is beneficial to retaining rainwater, enables salinity to be effectively leached and reduced, is beneficial to fertilizer and soil conservation, and enables the survival rate of landscape plants to be more than 90%, the waste is effectively utilized, natural resources are protected, and afforesting cost is reduced by more than 50%.

Description

technical field [0001] The invention belongs to the technical field of landscaping engineering, and relates to a method for designing landscaping, in particular to a greening method for improving coastal saline-alkali land terraced fields by dredging and filling. Background technique [0002] The formation of alkaline soil and alkalized soil in my country is mostly related to the accumulation of carbonate in the soil, so the degree of alkalization is generally high, and plants in severe saline-alkali soil areas can hardly survive. As one of the main types of saline-alkali land in my country, coastal saline-alkali land has the characteristics of large area, large regional differences, and difficulty in improvement. In particular, the afforestation of the original saline-alkali soil and dredger fill in the coastal area has always been a problem that has plagued the greening construction of the port for a long time. In the past, the landscaping in the port area mostly adopted ...

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Problems solved by technology

In addition, due to the shortage of water resources in the coastal areas, the salinization of the surface soil is intensified, and it is difficult for landscaping plants to survive here, which seriously affects the greening survival rate of coastal saline-alkali land.

[0003] At present, there are many mature saline-alkali soil improvement measures for original soil greening in coastal saline-alkali areas, mainly including (1) physical improvement, such as leveling the ground, deep plowing and sunning, raising the ground with foreign soil, micro-area soil improvement, and large-hole soil preparation. Soils with low water level and below moderate salinity have a certain improvement effect, but for areas with high water level, under the action of soil capillaries, the phenomenon of salt return will still occur, resulting in the accumulation of salt in the surface layer of the soil and hardening, making it difficult for plants to survive; (2 ) Improvement of water conservancy projects, such as drainage and irrigation, storage of light salt, irrigation of salt, salt drainage of hidden pipes, etc., although the effect of salt drainage is obvious, the cost of greening projects will be greatly increased by slotting and pipe layout; (3) Chemical improvement, adding Soil chemical amendment technology, such as calcium superphosphate, humic acid, vinegar residue, etc., has quick results, but the newly added chemical substances have changed the physical and chemical properties of the original soil. From a long-term perspective, single large-scale use of chemical amendments It will increase environmental risks, such as changes in soil microbial species; (4) Biological improvement, such as breeding and screening salt-tolerant plants. Although this method is also effective, the improved plants take a long time to adapt to the environment, and the short-term effect is slow. Choose plants with strong saline-alkali tolerance, single plant species, common halophytes such as Suaeda salsa, Tamarix bicolor, Limonium bicolor, etc., are herbaceous plants with poor landscape

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