Greening technique for improving clay soil in drought areas

Abstract

The invention provides a greening technique for improving clay soil in drought areas, which comprises the following steps: firstly, digging out the original soil by 60-100 cm; secondly, laying a gravel layer of 20-30 cm on the bottom; thirdly, laying a geotechnical drape on the gravel, making holes in the geotechnical drape with the density of 8-12 / square meter, and the diameter of the hole is preferably 2-3 cm; and fourthly, laying 40-70 cm of cultivated soil on the geotechnical drape. The content of stone blocks and sand in the cultivated soil is smaller than 15%, the cultivated soil shouldnot contain stone blocks and foreign matters of which the diameter is greater than 25 mm, the total salt content of the soil should be smaller than 2.2ms / cm, and the pH value is smaller than 8.5. Thetechnique is suitable for surface-form soil-displacement transformation and not suitable for cave-like soil-displacement transformation, and requires a minimum of 1 meter of the embedded depth of theunderground water. The technique aims to improve the clay soil; on the basis of sufficient analysis on the generation principle of salinization, the invention utilizes the greening technique; and therefore, the technique fundamentally solves the problems of salinization and secondary salinization of the green land soil, ensures the long-term effect for greening and has the advantages of short operation period, low cost and strong operability. From 2006 to 2008, the lawns, and arbor and shrub tree species for trial plantation are successful for three successive years, which sufficiently verifies the value and the practicality of the application and the popularization of the greening technique in drought areas.

Description

technical field [0001] The invention relates to soil improvement, in particular to preventing salinization of clay soil, and is especially suitable for greening technology for improving clay soil in arid areas. Background technique [0002] At present, in arid and semi-arid areas, one of the prominent problems often encountered in the transformation of human living environment and the implementation of greening projects is soil salinization and secondary salinization, which often directly affect the effect of greening projects, and even lead to failure. . Especially clay soil, this problem is most prominent. This is mainly caused by the climate background of low rainfall and strong evaporation in arid areas, as well as the characteristics of clay soil with poor water permeability and strong surface aggregation. Salinization is very easy to occur after irrigation. The large-scale land reclamation in the 1950s fully proved up to this point. In this regard, people in arid ar...

AI Technical Summary

Problems solved by technology

The former has a short time limit and often cannot solve the fundamental problem, while the latter has high requirements on terrain conditions, high engineering cost, complicated construction technology, and there are also problems of long-term operation pipeline blockage and difficult maintenance

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