What are the causes and treatment methods of saline alkali land?

Reasons for the formation of saline-alkali land: all kinds of saline-alkali soil are formed under certain natural conditions, and the essence of its formation is mainly the redistribution of various soluble salts in the horizontal and vertical directions on the ground, so that the salt gradually accumulates on the soil surface in the salt-collecting area. The main factors affecting the formation of saline-alkali soil are:

1. Climatic conditions.

2. Geographical conditions.

3. Soil texture and groundwater.

4. The influence of rivers and seawater.

5. Improper tillage management.

The causes and treatment measures of soil salinization are as follows:

The reason is climatic factors, the process of soil salinization is the process of accumulation of soluble salts in the soil surface layer step by step, and the process of surface evaporation and infiltration is an important driving force for the migration of salt in the soil, which directly controls the distribution and existence of salt in the soil.

Topographic and geomorphological factors, together with topography and landform, directly affect the runoff of surface water and groundwater. During the runoff of surface water and groundwater, the salts in the upper soil and formation are dissolved, and the total dissolved solids are continuously increased due to evaporation and concentration. Therefore, the degree of soil salinization gradually intensified with the topography from high to low and from upstream to downstream.

The treatment measures include chemical improvement measures are the method of improving saline soil through the application of chemical amendments and mineral fertilizers, and the commonly used chemical amendments are hidden dust organic or inorganic fertilizers, mineral fertilizers, calcium sulfite, desulfurization gypsum, phosphogypsum, ferrous sulfate, polymer amendments and soil comprehensive amendments.

Biological improvement measures, the aboveground growth part of plants has a shading effect, which can reduce soil water evaporation, reduce the rate of surface salt accumulation, plant salt absorption can reduce soil salt content, plant roots interspersed in the soil can change soil physical properties.

Soil salinization

Soil salinization refers to the process in which the salinity of the soil bottom layer or groundwater rises to the surface with capillary water, and after the water evaporates, the salt accumulates in the surface soil. It refers to the phenomenon or process of accumulation of soluble salts on the surface layer of soil.

The above content reference: Sogou Ask-High School Geography What are the causes and measures for the formation of land salinization.

The causes and treatment measures of soil salinization are as follows:

1. Natural factors. It is mainly determined by nature, when the groundwater level rises due to some reasons, or the water level is large during the rainy season, the probability of soil salinization will increase, especially in the area near the sea. Secondly, some relatively closed terrain will also be aggravated because the salt cannot be discharged.

2. Human factors. If the main slag is caused by man-made irrational irrigation, such as perennial flood irrigation, after infiltration, the groundwater level rises and leads to soil salinization, which can be said to be basically the result of years of accumulation.

Treatment measures: deep ploughing treatment, so that the soil is ventilated and breathable, which is conducive to improving the physical and chemical properties of the soil, can play a good role in inhibiting prudence, and the soil after deep ploughing can slow down the evaporation of part of the water in the soil, reduce a certain salt content, and can also play a certain inhibitory role.

In salinized soil, the application of organic fertilizer can play a certain role in regulation, and organic fertilizer will be transformed into humus after decomposition by microorganisms in the soil, which can reduce soil alkalinity to a certain extent. In addition, organic fertilizer will also produce certain organic acids during the decomposition process, so that the acid and alkali can be neutralized and play a role in alleviating salinization.

To a certain extent, crop rotation and stubble planting can also alleviate the salinization of the soil, which is suitable for plots with a light degree of salinization, so as to alleviate the effect.

Salinization of the land.

Refers to the high salt content of the soil (exceeding, which makes crops low or unable to grow.

There are two conditions for the formation of saline-alkali soil: first, the climate is arid and the groundwater level is high (above the critical water level); The other is low-lying and there is no way to drain the water. Groundwater contains a certain amount of salt, such as its water surface is close to the ground, and the area is relatively arid, due to capillary action.

When the water rises to the surface evaporates, it leaves behind salt, making the soil more salty.

Governance measures. Treatment of saline-alkali land.

The measures include water conservancy improvement measures (irrigation, drainage, dredging, rice planting, seepage prevention, etc.) and agricultural improvement measures (land leveling, improved tillage, soil application, fertilization, sowing, crop rotation, intercropping, etc.).

Biological improvement measures (planting salt-tolerant plants and pastures, green manure.

afforestation, etc.).

and chemical improvement measures (application of modified substances such as gypsum, phosphogypsum, calcium sulfite.

etc.). Four aspects. Since each measure has a certain scope of application and conditions, it is necessary to adapt measures to local conditions and comprehensively deal with them.

Measures for the treatment of saline-alkali land???

1. Timely harrowing can loosen the topsoil, cut off the soil capillary water to transport salt to the surface, and play a role in preventing salt return. Harrowing the land should be timely, shallow spring ploughing, rushing ambush ploughing, early autumn ploughing, ploughing dry but not wet. 2. Salt washing is to pour water into the saline-alkali land, and the slag dissolves the soil salt, and the soluble saline in the topsoil layer is discharged into the deep soil or washed out by infiltration, and the side seeps into the drainage ditch to be eliminated.

3. Non-chemical means of prevention and control can be used to effectively improve the soil with a special soil conditioner for saline-alkali land "alkali treatment", first turn the land that is ready to be applied to alkali treatment, rake it flat, and then dilute the quantitative alkali treatment with water (the dilution factor is not limited, it is appropriate to save time and effort), evenly spray it on the surface and then irrigate, and prevent water from running and irrigating.