Why is the higher the vegetation coverage, the stronger the dissolution rate of flowing water?

Dissolution itself is a chemical and physical process with rich meanings and many types of processes, so if it is only an influencing factor of vegetation, it cannot completely determine the dissolution rate.

But it is certain that vegetation can affect the dissolution rate of flowing water.

Vegetation is the most active factor in the process of soil formation, and it is the most important factor under the same climatic conditions, and the succession of vegetation changes the physical and chemical properties of soil and promotes soil formation. The positive succession of vegetation could improve the physicochemical properties of soil layer A, reduce bulk density, and increase porosity, water content and organic matter content. However, the physicochemical properties of the B-layer were improved in the early stage of succession, but decreased significantly in the later stage (arbor stage), the bulk density increased, and the porosity, water content and organic matter content were greatly reduced. Soil P H value decreased gradually with succession.

The surface dissolution rate decreases first and then increases with the positive succession of vegetation. The dissolution rate of rocks in soil increased with succession, which was inversely proportional to the contents of Ca and Mg, P H value, and proportional to the concentration of soil organic carbon and CO2. The surface dissolution rate of the surface layer was higher than that of the deep layer at the beginning of succession, and higher at the stage of arbor. The dissolution rate of rocks is also affected by various factors such as soil moisture content and porosity. "

As can be seen from the above paragraph, vegetation has an impact on the dissolution rate.

In order to solve the problem of water leakage in the cave, the vegetation on the top of the cave began to be controlled, because the spread of tree roots will accelerate the development of rock cracks, and the sulfate and carbonate in the vegetation layer will seep into the cave, which will accelerate the dissolution and weathering of the carvings. ”

From the above text, it can be seen that the biggest possibility of vegetation affecting dissolution is that vegetation has an impact on the object of dissolution --- rock mass, which affects the structure of the rock mass, and then affects the ability of the rock to resist dissolution, and indirectly affects the dissolution rate of flowing water.

I checked, and there is no direct relationship between the two, where did you see it?

1. Conditions and causes of surface water infiltration:

1. Meteorological conditions: the intensity of precipitation is small, and the duration of precipitation lasts;

2. Terrain conditions: flat ground and small slope;

3. Soil conditions: loose soil, large and many soil pores;

4. Surface vegetation conditions: The ground vegetation coverage rate is high, and the vegetation is lush.

2. Surface water refers to the general term of dynamic water and static water on the land surface, also known as "land water", including various liquid and solid water bodies, mainly rivers, lakes, swamps, glaciers, ice sheets, etc. It is one of the most important water sources for human life, and it is also the main component of water resources in various countries.

3. Surface water is formed by the accumulation of natural precipitation and snow over many years, and is naturally lost to the ocean, or by evaporation, and seeps into the ground.

Infiltration refers to the movement of rainwater from the ground into the soil. The following phases are included:

Infiltration stage: In the early stage of infiltration, the hygroscopic water has not been satisfied, and under the strong molecular force attraction, the rainwater infiltrates rapidly, so that the initial stage has a large infiltration rate. This phase ends when the infiltration brings the soil to its maximum molecular water holding capacity.

Seepage stage: infiltration rainwater, mainly under the action of capillary force and gravity, makes unstable movement downward along the soil pores until the soil is saturated and the capillary force disappears. At this stage, the infiltration rate varies greatly, and the higher the vegetation coverage, the greater the infiltration rate.

Infiltration stage: After the soil is saturated, the water flows steadily under the action of gravity, and the infiltration is carried out to stabilize the infiltration rate.

Less precipitation translates into surface runoff, which inevitably translates into more groundwater. Conditions conducive to surface water infiltration are:

Meteorological conditions: precipitation intensity is small, precipitation duration;

Terrain conditions: Flat ground with small slope;

Soil conditions: loose soil, large and many pores in the soil;

Surface vegetation conditions: high ground vegetation coverage and lush vegetation.

The root system of the plant can hold the water and soil.

Then the soil will not be easily carried away by the current.

On the one hand, vegetation can block sunlight from direct sunlight and reduce evaporation. On the other hand, vegetation has transpiration, which increases evaporation relatively speaking, because vegetation has to cope with transpiration and demand water on its own, so vegetation coverage and water conditions are important factors affecting evaporation.

If there is no vegetation, the water will be washed away with the soil The higher the vegetation coverage, the more water will be left, and as for the infiltration, it is only a matter of time, what do you think??

The vegetation coverage rate is high, the ability to conserve water is strong, the formation of surface runoff is slow during heavy rainfall, and the runoff of rivers increases slowly, that is, the flood peak of the river arrives late, and the water level is low during the flood peak period, so the quasi-vegetation coverage rate is high, which is conducive to reducing the flood disaster of the river. The vegetation coverage is high, the soil erosion is light, the sediment content of the river is small, and the sediment accumulation in the downstream is slow, even if the river runoff is large, the flood peak water level is not necessarily high.

If you want to reduce soil erosion when the planting area is large, the soil will eventually flow to the river through the erosion of water, and the silt in the river will increase, and the riverbed will not be raised, and the water level will naturally rise.

A place with high vegetation cover absorbs solar radiation from the ground under vegetation cover during the day.

There are fewer botans, and the temperature is low. Transpiration of vegetation at night.

The clouds can strongly absorb ground radiation and enhance the atmospheric reverse radiation, and the temperature at night is high, so the temperature difference between day and night is small.