Why does the soil give off a nice earthy smell after rain, and what is the substance that causes it?

The culprit of the earthy smell is Streptomyces. Streptomyces as the highest actinomycetes, although it is not visible to the naked eye, but it can release the smell of drowning after the rain falls to the ground, proving that it has come, this smell is geosmin, and the earthy smell is the smell of the corpse of a dead streptococci.

Because when it rains, there will be some smell of bacteria in the air, and the rhizomes of plants will also smell, and there will be a smell of acidic substances in the rain, so after the rain, there will be this nice smell of earthy.

It is caused by Streptomyces. This earthy smell is actually the smell of Streptomyces corpses after heavy rain drowns Streptomyces.

The earthy smell of the soil after rain is Streptomyces. Streptomyces is the highest actinomycetes. Although it is not visible to the naked eye, it can release the smell of being drowned after the rain has fallen to the ground.

This smell is geosmin, and the earthy smell is the smell of the corpse of a dead Streptomyces.

You may not know why there is an earthy smell in the air after rain.

The earthy smell is actually caused by actinomycetes' body odor geosmin.

There are many bacteria in the soil, and actinomycetes are just one of them, which like to survive in a warm, moist environment and have super fecundity. Actinomycetes have a lot of spores in their heads, and in a state of drought, these spores are dormant, and when it rains, they will become actinomycetes again, a bit like when it rains, the dry fish pond is full of water again, and there are many small fish out of thin air, which is admirable. The spores germinate and grow into new actinomycetes, and the head of the actinomycete grows spores again, and the cycle repeats, releasing geosmin in the process.

This is the root of the earthy smell.

Earthy, with an earthy aroma after rain. The earthy smell is related to actinomycetes, which in turn are related to spores, which in turn are related to geosmin, which has an earthy smell and is volatile, which is another key to the earthy smell, although it is only produced in drought. Once the small water droplets on a rainy day come into contact with the porous soil, small bubbles will be produced, because the bubbles are light, so they are easy to float in the air, and when they rise to a certain stage, they will spray out more tiny small water droplets, and then they will be inhaled into our noses.

Because of the mud after the rain, it became damp, and it was the mud that smelled damp.

Why did Mr. Li emit a good smell after the rain, and what substance caused it, this is the reason for the first trial.

Because the rain stirs up the dust on the ground, it forms floating dust.

Dust and fine sand float evenly in the air, making horizontal visibility less than 10,000 metres. Floating dust is mostly spread by distant dust and sand through the upper airflow; Or it is formed by the appearance of sandstorms and sand that have not yet sunk fine particles floating in the air. This weather condition is very harmful to the human lungs.

According to the meteorological department, the difference between a sandstorm and floating dust or blowing sand is visibility, and only when the visibility is less than 1 km can it be considered a sandstorm.

Causes of formation

Dust in the weather refers to the suspended particles in the air with a diameter of less than 10 microns and can float in the air for a long time, it is the most common pollutant in the air, usually we call it particulate pollutants. Most of these particulate pollutants are caused by human activities, such as black smoke, white smoke, red smoke, yellow smoke, etc. floating in the sky over industrial cities, and a large amount of particulate matter suspended in the air is released by the combustion of coal and fossil fuels, which seriously pollutes the atmosphere.

About 500 million tonnes of particulate matter are emitted into the air worldwide each year, mainly from fuel combustion and industrial exhaust gases. It is estimated that for every 1 ton of cement produced, kilograms of floating dust will be discharged.

1.Because the rain stirs up the dust on the ground and forms floating dust, although this is also a bit fishy. 2.

During a thunderstorm, lightning makes a chemical reaction to oxygen in the air 3o2 (energized) = 2o3The concentration of ozone in the air is slightly higher than before, and the smell of ozone is typical of fishy.

<> there is always a foul smell of earth after the rain, what is the reason? After the rain, we can often smell the smell of earth. Where do these fragrances come from?

According to experts, it comes from a type of bacteria called "actinomycetes" in the soil. Soil is a paradise for a wide variety of bacteria. Under the microscope, you will observe such a different class of bacteria:

Other bacteria are mostly round and oval, but they look filamentous. Some of the filamentous bacteria resemble a tree, and sometimes the tree bears "fruit"; Some of them are like a piece of grass, as if they are still blooming, and they are very beautiful. This type of bacteria is biologically known as actinomycetes.

Actinomycetes are single-celled organisms.

So if you see it looks like a tree or a piece of grass, it's just a cell. Those strangely shaped filaments are its mycelium. The hyphae cover a lot of space, which is great for finding food.

Actinomycetes release a chemical substance that allows us to smell the scent of earth.

Why is the scent of the earth more pronounced after the rain? Because actinomycetes are very viable bacteria, they generally prefer to survive in warm, moist environments. When the soil is dry, its hyphae grow spores on the head.

After actinomycetes gradually die, these spores will germinate and grow into actinomycetes as long as they encounter the right conditions. When it rains, the rain washes away the soil, and the spores that are buried in the soil on sunny days grow actinomycetes that spread with small droplets in the moist air. When they are inhaled into our nostrils, we feel an earthy scent.

The longer the land is dry, the more actinomycete spores will be present, so the fragrance of the soil after rain is especially noticeable after a long drought.

I suddenly remembered that when I used to live in a bungalow, it had just rained that day, there was still a rainbow hanging in the sky, and the newly moved neighbor was turning over the ground in the vegetable garden, I stood in the yard and sighed that the smell of the air smelled so good, and then the old man put down the work in his hand and turned his head to tell me, this is called the fragrance of the earth, haha, although this sentence sounds very ordinary now, but in the period when my childhood language was scarce, it was really shocking I repeated it in my heart several times. The old man's family didn't live long before they moved out, but I also felt that they didn't belong in this bungalow area.

The whole family is very cultured, and the quality of life is also very good, the Barbie doll owned by the granddaughter of the old grandfather.

It's beautiful, I've never seen it before.

1. Moist air after heavy rain is very beneficial for the spread of particles in the air. 2. There are a large number of aromatic substances that will be emitted by the impact of rain and moisture, and react with chemicals (such as gasoline). 3. It is actually produced by bacteria.

The bacteria grow easily in moist soils and produce spores in dry soils, so the smell is strongest after the first rains at the end of the dry season.

At this time, in the process of raining, the raindrops hitting the ground will cause the dust on the ground to fly, which will cause the smell of soil to spread in the air. Therefore, it will lead to an earthy smell.

After the rain, there is some steam, so that some of the smell in the soil will be emitted with the steam, and there will be an earthy smell.

In sparse and porous soil, there is a special substance that contains an "earthy smell" called "geosmin".

When the raindrops fall to the ground, they envelop the gas and form many small bubbles, and when the gas hits our faces, we smell the fragrance of the earth.

After rain, you can often smell the "smell of earth" in parks and fields, which is actually from bacteria and algae in the soil. There are many bacteria in the soil, and there is a "actinomycetes" that can release a special substance that contains an "earthy smell", and you can smell the fragrance of the earth when you get closer. Especially after rain, actinomycetes will grow and multiply quickly, so the taste will be more pronounced.

Similar to this is the smell of grass when mowing the grass, which is the volatile of the green leaves of the grass, which is actually a distress signal from the grass.

The smell of earth can be smelled after rain due to the diffusion of particulate matter in the air, the reaction of aromatic substances with chemicals after rain, and the smell of bacteria after rain.

1. Diffusion of particulate matter in the airMoist air after a rainstorm is very conducive to the dispersion of particulate matter in the air. Similar to the smell produced by bacterial spores, the smell is strongest after the first rain at the end of the dry season, which is why the smell after rain is not always pleasant, that is, it is often smelled in the woods.

2. Aromatic substances react with chemical substances after rainDue to the impact of rain and moisture, a large amount of aromatic substances are emitted, and they react with chemicals to adhere to the gaseous solvent formed by moisture in the air after rain. Rainwater, like the smell produced by bacterial spores, tends to exhibit a certain acidity that most people perceive as fresh and pleasant.

3. The smell produced by bacteria after rain:A pleasant smell after rain that we often smell in the woods is actually produced by bacteria! This bacterium grows easily in moist soils and produces spores in dry soils, so the smell is strongest after rain.

I don't know if you have noticed that after every heavy rain, there is a faint earthy smell in the air. And this kind of soil is wafting in the air, making people feel relaxed. And this taste makes nature even more aura. <>

And what is the smell of earth in the air after every rain? In fact, the reason why the smell of earth appears in the air after the rain is because after the rain, there are living or dead creatures in the air and soil, and the smell is eroded by the rain. And this earthy taste is actually another expression of nature.

According to scientific research, the reason why the earthy smell appears in the air after rain is mainly because bacteria are easy to breed after rain, and the earthy smell is mainly related to actinomycetes. Actinomycetes mostly live in moist soil, and when the soil is dry, actinomycetes produce spores to sustain themselves, and the drier the drought, the more spores actinomycetes produce. But after the rain the soil becomes moist, and the actinomycete spores begin to become active.

In our nature, almost all the soil is sparse and has a lot of voids inside. When it rains, when the water droplets come into contact with the soil, many small bubbles are formed in the position of the soil air. When these little bubbles burst, they spread through the air like the air fresheners we use.

It also carries a lot of the dirt with it. So that's why we often smell the smell of earth after the rain.

In fact, after the rain, the air is filled with not only the smell of earth, but also other smells. And these breaths are often in nature, and organisms are formed and metabolized after rain. The reason we smell earth is because the smell of earth is often stronger than anything else.

The first reason is the effect of ozone in the air, which smells like grass. Especially after lightning, the air is rich in ozone ions, which can purify the air, so the air is particularly fresh after a thunderstorm.

The second reason is the oil released by plants. In 1964, Nature published an article entitled "Argillaceousodour of Nature". Nature 201 (4923):

993 995, which says that when dry, some plants release some oils and fats that are absorbed by the soil. When it rains, the oil is released into the air, which contributes to the taste after the rain.

Why does the soil smell so fresh after the rain?

The third reason is the role of microorganisms. Healthy soil emits a faint earthy smell, which is the activity of various microorganisms that we cannot see with the naked eye. Radioactive bacteria, in particular, give off some pleasant odors.

Radiobacteria are filamentous bacteria that grow in soil in warm, humid climates. The spores are released only when the soil is dry. The spores are very tiny, can float in moist air, have a special, fresh, earthy smell and are easily inhaled.

So in dry places after rain, the fresh smell of the earth is stronger.

Why does the soil smell so fresh after the rain?

As for the earthy smell, it is a metabolite of spore formation, which accumulates in the soil. When it rains, it is emitted with the air in the soil, but it loses its smell after continuous rain.