Method for increasing afforestation survival rate of quick growing tree species in coastal saline-alkali land through catchment, salt leaching and water retention

Abstract

The invention provides a method for increasing the afforestation survival rate of quick growing tree species in a coastal saline-alkali land through catchment, salt leaching and water retention. The method comprises the steps of platform field building, wherein earth cutting and bed hedgehopping are performed on a section to be afforested to form an east-to-west platform field and a drainage ditch before a rainy season in the first afforestation year, the length of the platform field is 50-100 m, the width of the platform field is 20-50 m, the platform field is 1-1.5 m higher than the ground surface, the drainage ditch is 1-1.5 m lower than the ground surface, a cofferdam is built at the periphery of the platform field, the height of the cofferdam is 0.8-1.2 m, and the width of the cofferdam is 0.5-1.0 m. The method has the advantages that due to the fact that the platform field is small and convenient to construct, the soil salt content can be quickly decreased in half a year to one year through catchment, and the salt leaching speed is high; through comprehensive film mulching, soil moisture evaporation can be effectively reduced, salt content increasing can be prevented, and it is guaranteed that leached salt cannot rise to the ground surface layer; meanwhile, water can be retained, weed growing can be inhibited, the survival effect on black poplar, willow and elm seedlings which are poor in salt tolerance and high in water requirement is significant, and the problem that afforestation of black poplar, willow and elm trees is difficult in a saline-alkali area can be significantly solved.

Description

technical field [0001] The invention relates to afforestation technology on saline-alkali land, in particular to a planting technology for collecting water, washing salt and retaining water to improve the survival rate of fast-growing tree species in coastal saline-alkali land. Background technique [0002] There is a large area of ​​coastal saline-alkali land in my country. The soil type is coastal saline-alkali soil. This type of soil is characterized by heavy texture, high salt content, high pH value, high groundwater table, and high salt content in groundwater. With the evaporation of water in the soil, the salt in the groundwater gradually accumulates to the upper surface of the soil, causing the salt content in the surface soil to gradually increase, forming secondary salinization. Although some plants such as Suaeda salsa, Tamarix, Elaeagnus sativa, Iris, white wax, etc. are resistant to saline and alkali, they can survive on saline-alkali soil, but their growth rate ...

AI Technical Summary

Problems solved by technology

Although some plants such as Suaeda salsa, Tamarix, Elaeagnus eraeus, Iris, white wax, etc. are resistant to saline and alkali, they can survive on saline-alkali land, but their growth rate is slow, their wood output is low, and their economic value is not great.

At present, fast-growing tree species that grow fast, can provide timber, and have high economic value, such as black poplar, willow, elm, etc., have poor salt tolerance, and the survival rate of afforestation on saline-alkali land by conventional methods is very low, and it is difficult to form forests and form an effective economic system. efficiency and eco-efficiency

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