What are the ways in which plants can remediate soil pollution?

Contaminated soils can be remediated to reduce their risk or hazards and restore their function, but generally requires a large amount of money and a longer period of time. Soil remediation refers to the transfer, absorption, degradation and transformation of pollutants in soil through physical, chemical and biological methods to reduce their concentration to acceptable levels, or to convert toxic and harmful pollutants into harmless substances, generally including bioremediation, physical remediation and chemical remediation 3 types of methods. Due to the complexity of soil contamination, multiple technologies are sometimes required.

Bioremediation technology was developed in the 80s of the last century, and its basic principle is to use the unique ability of organisms to decompose toxic and harmful substances to achieve the purpose of removing pollutants in the soil, mainly including phytoremediation technology, microbial remediation technology and biological joint remediation technology. The advantages are that it does not destroy soil organic matter, does not disturb the soil structure, and has low cost; The disadvantage is that the remediation period is long, and it is usually not suitable for the remediation of highly contaminated soils.

Physical remediation refers to the technique of removing or separating contaminants from the soil through various physical processes. At present, commonly used technologies include guest soil method, thermal desorption, soil vapor phase extraction, mechanical ventilation, etc. The advantage is that the repair efficiency is high and fast; The disadvantage is that it is often more expensive.

Chemical remediation refers to the addition of chemicals to the soil through redox of heavy metals and organic matter.

Chemical reactions such as chelation or precipitation to remove contaminants from the soil or to reduce the bioavailability or toxicity of contaminants in the soil. It mainly includes soil solidification and stabilization, leaching, redox and so on. The advantage is that the repair efficiency is higher and the speed is relatively fast; The disadvantage is that it is easy to damage the soil structure, and it is easy to produce secondary pollution due to the addition of chemical agents.

The above are a few ways to remediate soil pollution by plants, I hope mine is helpful to you.

1. Plant enrichment, the use of heavy metal super-enrichment plants to absorb heavy metals in the soil; 2. Plant fixation: reduce bioavailability and mobility; 3. Plant volatilization; 4. Plant degradation.

What are the ways of remediation of soil pollution by plants Plants rarely remediate soil pollution, and the main ones that remediate soil pollution are microorganisms, and the role of plants is to ensure the diversity of the ecological environment and complement each other with beneficial microorganisms.

Plant Extraction Technology.

Phytodegradation technology.

Plant immobilization technology.

Features of phytoremediation technology:

1) The most significant advantage of phytoremediation technology is that it has low cost, which has obvious advantages compared with conventional landfill methods and physicochemical methods. According to practice in the United States, the cost of planting management is $200 1000 per hectare, which corresponds to an annual treatment cost of US$ m3, which is orders of magnitude lower than the cost of physicochemical treatment.

2) Phytoremediation is an in-situ treatment technology, which has the effect of protecting topsoil, reducing erosion and soil erosion, and at the same time, transpiration can prevent the downward migration of pollutants, and can also supply oxygen to the rhizosphere, which is conducive to the degradation of organic pollutants.

3) Centralized treatment of plants can reduce secondary pollution, and some plants with high heavy metal content can use the heavy metals absorbed by plants through plant smelting technology.

(4) The process of phytoremediation is also a process of increasing soil organic matter content and soil fertility, and the soil after phytoremediation can be planted with a variety of crops.

5) The phytoremediation process is simple to operate and has long-lasting effects, such as plant stabilization technology can make the surface stable for a long time, which is conducive to the improvement of the ecological environment and the reproduction of wild animals.

Different measures should be taken for different degrees of soil damage, such as the lack of soil fertility, the application of green organic fertilizer, increase soil organic matter, restore and improve soil fertility. There are many factors that affect the soil, such as the effect of fertilizers in the soil on the soil, and so on. Let's talk about what to do if the soil is damaged and why these problems occur in the soil.

Enumerate: 1: Soil fertility declines: because farmland has not been applied to farmland for a long time, straw is returned to the field.

Rarely carried out will reduce the content of soil organic matter, and the structural damage and compaction of the soil will be more serious. Measures taken: increase the use of farm fertilizer, farm fertilizer contains more nutrients, can supplement the lack of nutrients in the soil, improve the organic matter content in the soil.

In addition, the method of returning straw to the field can also be used, which has a good effect on improving soil organic matter. <>

2: Soil salinization.

Unreasonable fertilization in the process of farming, excessive application of chemical fertilizers, and excessive use of fertilizers containing more nitrogen lead to low soil organic matter content and trace elements.

insufficient, soil compaction; The number of beneficial microorganisms in the soil decreases and is not replenished for a long time. Measures: chemical methods can be used to solve the problem, and the general chemical improvement method mainly uses the application of gypsum, phosphogypsum, and calcium sulfite.

and other chemical substances to improve, and the speed of this improvement method is relatively fast. The degree of soil salinization varies from place to place, and measures should be taken according to local conditions. <>

3: Soil acidification: Because excessive application of nitrogen fertilizer and physiological acid fertilizer, it will lead to an increase in acidic substances in the soil, which will acidify the soil.

Soil acidification will cause soil nutrient loss, activation of harmful heavy metals in soil, increase of harmful microorganisms in soil, especially parasitic fungi, and accelerate the occurrence of soil impoverishment and soil-borne diseases. Therefore, the impact of soil acidification is still relatively large. Take action:

Quicklime can be applied to the soil after the produce is harvested.

Adjust the pH in the soil with quicklime.

In addition, we can also use precision fertilization, when we cultivate crops, we apply fertilizer to them according to the needs of the plants, and reduce the amount of chemical fertilizer used. <>

Apply organic fertilizer. It can increase soil organic matter, improve soil fertility, apply organic fertilizer can increase soil organic matter, and can also plant green manure crops. Acidic soils should be neutralized with lime and other alkaline materials, which can be gradually improved from year to year.

The application of organic matter in acidic or alkaline soils favors the utilization of various nutrients.

Coordinated crop rotation system: soil nutrient imbalance, different crop rotation methods can be used to absorb more nutrients, reduce the damage to the soil, so as to achieve a state of nutrient balance, and then through appropriate fertilization, the imbalance of soil nutrient deficiency can be improved.

Green fertilizers can improve the quality of open spaces. For legumes, such as clover and green beans, let the roots break down in the soil, adding as much soil element as possible. Green fertilizers can improve soil structure, bring more nutrients, and increase soil humus content.

But whether or not to use green manure depends on the date, soil conditions, gardener's needs, and terrain conditions. Crop rotation allows plants to grow one after the other in fertile soil. There is no risk of poverty, and pests and diseases do not have time to attack susceptible plants because the plants are constantly on the move.

Crop rotation, especially for leguminous crops, is most conducive to increasing soil organic matter. The use of plastic film mulching should be increased in management to reduce soil erosion and topsoil erosion, which is also one of the ways to maintain soil organic matter. In recent years, the application of humic acid and peat soil has also been beneficial to the increase and stabilization of soil organic matter.

The climate is also the main condition that affects the soil, in winter, the plants on the ground are eroded, naturally seeping into the soil, where they are broken down into organic matter by soil decomposers, forming the black soil as we know it in the following year. On the other hand, if a place is washed by rain throughout the year, nutrients in the soil are lost.

Since different crops have different requirements for soil nutrients, it is important to understand the characteristics of crop varieties that require fertilizers. During growth, the leaves replenish the nutrient deficiencies. Then improve the properties of the soil, such as acid-base discomfort, which can adjust the nutrient absorption balance.

If it is due to certain nutrients.

There are many factors that affect the soil, and it has to do with the local socio-ecological circle and the crops grown in the soil. If you want to repair the soil, you should level the land as much as possible and plant it every other year.

Soil fertility must be ensured, watering and fertilizing must be done in time, and the straw can be ground into foam and buried in the soil, which may be caused by weather factors, may be because of crops, and may be pests and diseases.

Understand the soil, then find out the factors that are not good in the soil, and add more fertilizer to the soil to fix it. Environmental factors, social factors, personal factors, weather and temperature factors.

In such a situation, first of all, we must use more new soil, so that the soil can be repaired. The factors that affect the soil are the later use, plus the influence of the environment itself.

1. Rational use of pesticides and control of pollution sources.

I can prescribe the right medicine in the use of pesticides and look for it.

Quasi-critical period medication, rational use.

Pesticides, control the concentration and dosage of pesticides, only in this way can we achieve both prevention.

Treat pests and diseases and reduce pollution to the environment.

2. Fully mobilize the degradation capacity of the soil itself.

Through various agricultural measures, adjusting soil structure, clay content, organic matter content, soil pH, ion exchange capacity, and the number of microbial species to enhance the degradation ability of soil pesticides will be conducive to the prevention and control of soil pesticide pollution. Qi Yusen.

3. Use bioremediation technology to prevent and control soil pollution.

1.Microbial remediation: Microbial remediation, microbial cultivation, and microbial remediation, which can be artificially inoculated in contaminated soil, can degrade pesticides.

Biology is a method of using microorganisms to degrade or remove pesticides remaining in the soil, convert them into harmless substances or degrade them into C02 and water.

2.Phytoremediation technology has gradually become a research hotspot in bioremediation, which is suitable for large-area and low-concentration pollution, which can not only remove heavy metals and radioactive elements in the environment, but also remove pesticides in the environment.

3.Mycorrhizal repairMycorrhizal is a symbiosis formed by soil fungal hyphae and plant roots. reported.

Va mycorrhizal ectohyphae account for about 1% of the root weight, and these ectophytic hyphae increase the contact between roots and soil, which can enhance the absorption capacity of plants, improve plant growth, and improve plant stress resistance and tolerance. On the other hand, mycorrhizal plants can provide nutrients to fungi and maintain fungal metabolic activity. In addition, mycorrhizae have a unique enzymatic pathway that degrades organic matter that cannot be transformed by bacteria alone.

So mycorrhizal plants.

As a good carrier for the repair of life.

What is soil remediation.

Soil remediation is soil improvement and soil correction: it is the addition of soil elements such as aura, organic matter, etc. to the soil. Such as natural fertilizers (organic compost), peat soils, or chemical fertilizers, these soil modifiers improve their ability to support plant life.

Chemical fertilizers are also added to improve the soil by adding soil nutrients, but the singleness of chemical fertilizer elements will make the soil environment worse. Soil amendments such as sphagnum moss and organic fertilizers improve plant health better through their texture or water supply and drainage, thereby improving the soil environment. But peat soil does not increase nutrients in the soil.

During the planting process, organic compost can also improve soil texture and water supply and drainage by adding nutrients. Composting, sphagnum moss, and mulching all help the soil retain moisture better. Soil correction can also change the pH of the soil.

For example, sphagnum moss is acidic, and it is suitable for use around acid-loving plants.

How to remediate the soil.

This is one of the most effective types of soil remediation, but one of the most effective.

Soil modifications with compost and other forms of organic matter can be seen as a solution to soil problems and part of your regular landscape maintenance.

No matter what type of soil you have, adding soil modifiers can improve your soil. It can solve, for example, the problem of excessively sandy soils that do not retain enough moisture, or excessively clayey soils that retain too much moisture or, conversely, others.

However, even in the absence of known issues, you should correct the soil as part of a gardening preventative care regimen. Well-fertilized plants are more likely to resist plant diseases and resist pest invasions.

Abstract Hello, the beneficial effects of poplar on soil and groundwater have been extensively studied. Their secret lies in the root system, which can hold a lot of water. Chlorinated solvents such as trichloroethylene or carcinogenic carbon tetrachloride have been studied as organic pollutants, but hybrid poplars can cope well.

At the same time, the Canadian Bioremediation Methods Database – PhytoPET (Bioremediation Functions in Aquatic and Terrestrial Ecosystems) labels poplars for their ability to degrade petroleum hydrocarbons such as benzene, toluene, and o-xylene.

Indian mustard cruciferous species remove 3 times more cadmium than other species, reduce lead by 28% and selenium by up to 48%, and are also effective against zinc, mercury and copper.

Which plants can remediate soil contaminated with heavy metals.

Hello, the beneficial effects of poplar on soil and groundwater have been extensively studied. Their secret lies in the root system, which can hold a lot of water. Chlorinated solvents such as trichloroethylene or carcinogenic carbon tetrachloride have been studied as organic pollutants, but hybrid poplars can cope well.

At the same time, the Canadian Bioremediation Methods Database – PhytoPET (Bioremediation Functions in Aquatic and Terrestrial Ecosystems) labels poplars for their ability to degrade petroleum hydrocarbons such as benzene, toluene, and o-xylene. Indian mustard cruciferous species remove 3 times more cadmium than other species, reduce lead by 28% and selenium by up to 48%, and are also effective against zinc, mercury and copper.

What crops are suitable for planting plots with excessive heavy metals?

What crops are suitable for planting plots with excessive heavy metals?

Hello, plots with excessive heavy metals are not suitable for growing crops.

The crops grown in this way are harmful to the body.

Hello, what is your problem?

Is this crop affected by excessive heavy metals?

Is this crop affected by excessive heavy metals?

Hello, this leaf is yellow, caused by many reasons.