A greening method for stepwise controlled salt discharge in coastal saline-alkali land

Abstract

The invention relates to a greening method for controlling and discharging salt stepwise in a coastal saline area. The greening method is characterized by comprising the following steps: constructing a floral band area, a shrub band area and a tree band area in sequence in an area to be improved; aiming at the floral band area, the shrub band area and the tree band area, arranging planting soil layers with the thicknesses of 40 to 60 cm, 65 to 80 cm and 100 to 120 cm respectively; arranging sprinkling layers with the thicknesses of 5 to 12 cm, 10 to 15 cm and 15 to 25 cm respectively below the planting soil layers, wherein the sprinkling layers are respectively made of straws with the diameter of 1 to 2 cm, coarse sand with the diameter of 0.5 to 2 mm, and graded broken stone with the diameter of 5 to 10 mm; geotextile externally-packaged drainage boards are arranged between different types of vegetation interfaces. According to the greening method, the buried depths of the sprinkling layers are arranged stepwise according to the plant species and root activity layer depths, so that the excavation and backfilling workload is greatly reduced, the construction period is shortened, and the cost is low.

Description

technical field [0001] The invention relates to a soil salt discharge control method for coastal saline-alkali green land, in particular to a soil salt discharge control method for coastal saline-alkali green land with distinct vertical layers for classified planting of trees, shrubs, and flowers. Background technique [0002] Coastal saline-alkali land is an area directly or indirectly affected by sea water or tides. my country has a vast sea area, with a coastline of 18,000 km and a salt flat area of ​​about 22,000 km 2 , is an important reserve land resource in my country, but high salinity, easy to repeat technical problems seriously restrict the development and construction of coastal salt flats. In coastal areas, due to the proximity to the sea, the groundwater level is high and the water quality is salty. Under the dual effects of ocean tides and seawater-type groundwater, the soil salinity remains high, especially in areas with high evapotranspiration ratios, such a...

AI Technical Summary

Problems solved by technology

However, since the technical construction does not distinguish the vegetation type and the layout characteristics of the green space, the thickness of the planting soil is laid out at a uniform depth. In view of the growth of the root system of trees and shrubs, the buried position of the drench layer and blind pipes is generally deep, and the excavation depth is generally 1.2-1.4m. , during large-scale construction, the amount of excavation and backfilling is too large; the drench layer material is uniformly made of alkaline slag, and the dead pipes are all laid in the green area, which results in high cost and long construction period

In addition, due to the consistent and deep planting soil layer, the later stage of leaching and desalination process consumes a lot of water and costs high, which easily leads to waste of water resources

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