Saline-alkali land improvement system and method

Abstract

The invention discloses a saline-alkali land improvement system. The system comprises a drainage channel, a subsoil layer and a planting layer, wherein the drainage channel is arranged above the subsoil layer, and the side face of the drainage channel is provided with the planting layer containing to-be-improved saline-alkali soil; an impermeable interlayer is arranged between the subsoil layer and the planting layer, the bottom of the drainage channel is configured to be impermeable, and the impermeable interlayer is connected with the upper edge of the bottom of the drainage channel; the impermeable interlayer is configured to be gradient from the end away from the drainage channel to the drainage channel; a first planting area to an Nth (N is greater than or equal to 2) planting area are sequentially arranged on the planting layer, from the end away from the drainage channel to the drainage channel, at the same side of the drainage channel, and the Nth planting area is next to the side wall of the drainage channel; the end, away from the drainage channel, of the first planting area is provided with a first-level infiltrating irrigation channel, and the end, away from the drainage channel, of the Nth planting area is provided with an N-level infiltrating irrigation channel; the side wall of the first-level infiltrating irrigation channel and the side wall of the N-level infiltrating irrigation channel are configured to be permeable; the side wall of the drainage channel is configured to be permeable; the first planting area to an Nth planting area are used for planting plants with salt resistance from weak to strong in sequence.

Description

technical field [0001] The invention belongs to the field of soil improvement, in particular to a system and method for improving saline-alkali land, especially coastal saline-alkali land. Background technique [0002] The soil in the coastal area has high salinity, and the groundwater is affected by the seawater and has a shallow buried depth and a high degree of mineralization, so it is not suitable for agricultural production. The salt in the groundwater accumulates in the soil layer with the rising capillary water under the strong evaporation of the surface, resulting in a heavy soil texture, poor structure, and poor air permeability. The underground freshwater resources in the coastal area are extremely scarce, but there is a lot of rainfall. Due to the poor soil permeability, most of the rainwater flows into the sea in the form of surface runoff, which does not play the role of "fresh water pressing salt" to the greatest extent. [0003] Land salinization not only red...

AI Technical Summary

Problems solved by technology

For coastal areas that are extremely short of fresh water, this method is obviously difficult to promote on a large scale

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