Greening method for coastal saline-alkali land after soil improvement

Abstract

The invention discloses a greening method for coastal saline-alkali land after soil improvement. The formula of improved coastal saline-alkali soil includes the original soil, 35% of hill-skill sand,20% of corn straw, 1.2% of desulfurized gypsum, 30kg of an organic fertilizer and 20kg of peat. Tree holes with the depth of 1m and the diameter of 1.2m are dug, a salt barrier layer is arranged around each tree hole, the bottom of the tree holes is buried with blind holes which are communicated with three tree holes, and there are a stone chip leaching layer with the height being 10cm, a fillinglayer with the height being 70cm and an irrigation layer with the height being 20cm in sequence on the blind pipes. The irrigation of the tree holes takes tap water as a water source and adopts a quantitative and intermittent irrigation mode, 200kg of tap water is irrigated into the tree holes once a day, and the irrigation is stopped after 7 days. The greening method determines the saline-alkalisoil improvement formula in allusion to main physical and chemical properties and soil structure of the river saline-alkali soil, and provides technical support and engineering experience for greeningthe river saline-alkali land.

Description

technical field [0001] The invention relates to a method for afforesting coastal saline-alkali land greening after soil improvement, and belongs to the field of coastal saline-alkali land greening. Background technique [0002] Saline-alkali soil is usually a general term for saline soil and alkaline soil. The salt content in the soil is usually above 0.2%, the alkalization degree is above 15%, and the pH is above 8. The hazards of soil salinization are concentrated at the two levels of soil and plants: the soil colloidal structure is damaged and cannot be aggregated and loosened, which seriously affects the air permeability, water permeability, water retention, and fertilizer retention of the soil, and the soil organic matter content is very low and N , P, and K fertilizers are very limited in effectiveness, resulting in the decline of soil fertility and no grass can grow; in terms of plants, it is mainly a phenomenon of salt damage, which is manifested as water ribs, press...

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Problems solved by technology

However, the existing physical and chemical improvement measures still have certain disadvantages, which are mainly manifested as excessive reliance on water conservancy engineering measures, large project investment, high cost, short duration of treatment effect, and secondary pollution problems, etc.

In addition, most of the work done by Chinese scientific researchers is aimed at the transformation and utilization of farmland and tidal flats with severe saline-alkali soil. There are relatively few studies on the greening of saline-alkali areas. How to summarize and improve the experience of farmland improvement and tidal flat saline-alkali land management to small areas Greening should be the focus of future research work