Method for in-situ restoration of saline-alkali land ecosystem in Yellow River delta by using triarrhena lutarioriparia and biochar

Abstract

The invention discloses a method for in-situ restoration of a saline-alkali land ecosystem in the Yellow River delta by using triarrhena lutarioriparia and biochar, and belongs to the technical fieldof saline-alkali land improvement. According to the addition of the biochar, specifically, calculation is conducted according to the soil pH, the salt content and the soil property, the soil pH of coastal salt-alkali land of the Yellow River delta is 8.5, the salt content is 0.75%, the soil is sandy clay loam in property, the content of organic matter is low, and the application amount of the biochar is 2-4% of the weight of the soil. An application method comprises the steps that (1) the land is leveled; (2) the specific addition amount of the biochar is calculated according to the soil density and planting depth of an improvement site, the specific addition amount of the biochar is 2-4% of the weight of the soil, and a calculation method for the weight of the soil is that the weight of the soil is equal to a product of the surface area of the improvement site, the planting depth and the soil density; (3) a calculated amount of biochar is evenly laid on the surface of the soil, and soil turning and even mixing are conducted; (4) aging is conducted for three days after even mixing, and miscanthus of triarrhena lutarioriparia can be planted. By means of the technical scheme, the in-situ restoration of the saline-alkali land ecosystem in a coastal area of the Yellow River delta can be achieved, physiochemical characteristics and biocenosis structures of the soil of the restored saline-alkali land are greatly changed, and the restored saline-alkali land is suitable for the survival and normal growth of miscanthus.

Description

technical field [0001] The invention belongs to the field of ecological restoration of saline-alkali land, and in particular relates to a method for in-situ restoration of the saline-alkali land ecosystem of the Yellow Triangle by using Nandi and biochar. Background technique [0002] Soil salinization is a worldwide problem. my country is the third country with the largest distribution of saline-alkali land in the world. The Yellow River Delta is a receding land formed by the interaction of sea and land, with little annual rainfall and large evaporation. Soil salinization is very common in this area. According to the salt content of the soil, saline-alkali land can be divided into mild, moderate, and severe saline-alkali land. Generally, the soil salt content of mild saline-alkali land is 0.1% to 0.3%, moderate is 0.3% to 0.6%, and severe is >0.6%. According to statistics, the area of ​​salinized land in the Yellow River Delta is about 442,900 hm2, accounting for more ...

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Problems solved by technology

Although some achievements have been made in the improvement of saline-alkali land by physical and chemical methods at home and abroad, there are problems such as large amount of engineering and high cost in physical methods, and secondary pollution easily caused by chemical methods.

In the improvement process of saline-alkali land, physical and chemical measures have been used to achieve great results, but at the same time there are problems such as large amount of engineering and high cost. Mineral elements such as P, Fe, Mn, and Zn are also drained away at the same time, and there are defects such as groundwater, downstream water sources being polluted, and the effect of salt pressing is difficult to consolidate. , the more important thing is to achieve high and stable yields, that is to say, it is necessary to eliminate salt and fertilize the soil, so we began to focus on biological improvement measures

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