What are the grades of soil corrosion rate?

There are three levels of soil erosion: high, medium, and low.

High: Resistivity < 20

Salinity"; Water content" 12;current density; Corrosion Grade: Extra Strengthened.

Medium: Resistivity: 20 50

Salinity"; Moisture content: 5 12;current density; Corrosion Grade: Strengthened.

Low: Resistivity 50

Salinity"; Water content<5;current density; Corrosion Grade: Ordinary Grade.

: High, Medium, Low.

High: Resistivity < 20Salinity"; Water content" 12;current density; Corrosion and other versions: special weighted strong grade.

Medium: Resistivity: 20 50Salinity"; Moisture content: 5 12;current density; Corrosion Grade: Strengthened.

Low: Resistivity 50Salinity"; Water content<5;current density; Corrosion Grade: Ordinary Grade.

There are three levels of soil erosion: high, medium, and low.

High: Resistivity < 20

Salinity"; Water content" 12;current density; Corrosion Grade: Extra Strengthened.

Medium: Resistivity: 20 50

Salinity"; Moisture content: 5 12;current density; Corrosion Grade: Strengthened.

Low: Resistivity 50

Salinity"; Water content<5;current density; Corrosion Grade: Ordinary Grade.

Grading of soil erosion intensity.

1) Allowable standards for soil erosion.

Soil erosion tolerance refers to the maximum amount of soil loss that can maintain soil fertility and maintain the basic stability of land productivity in the long term.

Because of the vast territory of China, the natural conditions are very different, and the soil formation rate in each region is not the same, the standard stipulates the allowable amount of soil in the main erosion type areas of China

Woo roll erosion type area.

Allowable soil loss.

et／(km

a)] Northwest Loess Plateau region.

oooo Northeast Black Soil Zone.

Northern soil and rocky mountainous areas.

The red soil hilly area in the south.

Southwest Dirt and Stone Mountainous Area.

2) Classification of hydraulic erosion intensity.

Intensity grading. The average erosion modulus [t (km

a)] Microerosion.

2o0，500，1

Mild erosion. Moderate erosion.

Strength erosion. Extreme Strength Erosion8

Intense erosion. 3) Classification of wind erosion intensity.

The classification of wind erosion intensity was divided into three indexes: surface vegetation coverage, hydrazine erosion thickness and erosion modulus.

Intensity graded vegetation coverage.

Annual wind erosion thickness.

Erosion modulus. ram)

t／(km。·a)] Micro.

Mild. 2～1o

Moderate. 5o～301o～25

5oo 5 intensity. 3o～10

Extreme strength. Acuteness. 1o

In addition, there are grading standards such as surface erosion, trench erosion, and gravity erosion.

Soil erosion intensity.

The amount of soil erosion that is eroded and displaced per unit area and unit time under the action of natural forces and human activities.

2.Soil erosion intensity is a quantitative representation and measurement of the amount of soil erosion and the intensity of erosion in a certain area, which is usually obtained by investigation and long-term positioning observation, and is an important basis for soil and water conservation planning and the layout and design of soil and water conservation measures.

Degree of soil erosion.

The degree of soil erosion refers to the difference in the relative stages or relative intensities of soil erosion development.

Soil erosion intensity refers to the amount of soil loss per unit area and unit time, which has a certain correspondence with debris flow activities, and it reflects the degree of fine particulate matter in the watershed.

Soil erosion refers to the process by which soil and its parent material are destroyed, eroded, transported and deposited under external forces such as hydraulics, wind, freeze-thaw or gravity. The mass of soil displaced by external forces is called soil erosion. The amount of erosion per unit area per unit of time is called the soil erosion rate (or soil erosion rate); The amount of sediment that is transported out of a specific area in the amount of soil erosion is called soil erosion.

In a specific period of time, the total amount of sediment that passes through a small watershed outlet in a certain observation section is called the sediment production of the watershed. The widely used term "soil erosion" refers to the process of soil surface and its parent material being eroded, washed and transported under the action of hydraulics.

"Water" and "soil" are the two main causes of soil erosion, and soil erosion is ultimately the repeated erosion of the land surface and the loss of water.

The quantitative index of soil erosion should include the intensity indicators of two erosion subjects at the same time.

The soil erosion intensity grading standard currently used in China as the soil erosion intensity grading standard not only confuses the two different concepts of soil erosion and soil erosion, but also is one-sided, inaccurate and not serious, and it is necessary to revise and improve the author's opinion

The grading standard of soil erosion intensity should reflect the intensity grading standard that contains two erosion subjects at the same time, and one is indispensable.