Deep root system plant planting pool for intercepting road soil pollution

Abstract

The invention belongs to the technical field of soil pollution treatment, and discloses a deep root system plant planting pool for intercepting road soil pollution, which comprises a pool body, the pool body is in an inverted conical shape and is arranged on a roadside green belt, the periphery of the top end of the pool body is provided with a protective layer, and the bottom end of the pool body is provided with a nutrition layer for the growth of deep root plants; the water treatment layer is arranged in the pool body and is positioned above the nutrition layer; the gradient permeable layer is arranged in the pool body and arranged above the nutrition layer, the deep-rooted plants are planted in the gradient permeable layer, and seepage water of the road surface penetrates through the gradient permeable layer and then enters the water treatment layer to be treated; the covering layer is arranged at the top end of the pool body and the top end of the gradient permeable layer. The deep-rooted plants are combined with layer-by-layer filtration, residual pollutants are adsorbed, pollution interception and biodegradation in the vertical direction are achieved, the remediation efficiency is improved, engineering stability and ecological sustainability are both achieved, and the method is suitable for soil remediation and greening quality improvement of high-pollution-risk roads.

Description

Technical Field

[0001] The present invention relates to the technical field of soil pollution control, and in particular to a deep-rooted plant planting pool for intercepting road soil pollution. Background Art

[0002] During road use, pollutants such as vehicle exhaust, leaked fuel, tire wear debris and anti-skid materials on the road will gradually accumulate. These pollutants will seep into the surrounding soil and cause pollution, which will not only damage the soil ecology and affect plant growth, but may also spread and accumulate deep into the soil through the groundwater system, affecting the groundwater.

[0003] Existing soil pollution interception technologies mostly rely on physical barriers or chemical remediation and in-situ remediation, but physical barriers cannot remove existing pollutants and have a short lifespan and high maintenance costs; chemical remediation is prone to secondary pollution and is costly. Traditional in-situ remediation uses shallow-rooted plants, which makes it difficult to block the vertical migration of pollutants, resulting in the continued deterioration of the problem of road runoff infiltration pollution. Deep-rooted plants have main roots that are 2-3 meters deep, and their lateral roots are densely distributed in a network. They have the ability to accumulate heavy metals and can adapt to soil environments with a pH of 4.5-8.0. They have been successfully used in mine remediation. As the core greening unit of the road, in addition to their ecological landscape functions, the deep roots of street trees can serve as a natural pollution barrier; however, the existing tree pits only provide shallow planting space, which can neither guide the roots to penetrate the pollution layer as deep as 2 meters, nor block the infiltration of runoff pollutants, resulting in the continued spread of underground pollution.

[0004] Therefore, the present invention discloses a deep-rooted plant planting pool for intercepting road soil pollution to solve the above technical problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a deep-rooted plant planting pool for intercepting road soil pollution, so as to solve the problems existing in the prior art.

[0006] To achieve the above objectives, the present invention provides the following solution: The present invention provides a deep-rooted plant planting pond for intercepting road soil pollution, comprising:

[0007] The pond body is in an inverted cone shape and is opened on the roadside green belt. The top periphery of the pond body is provided with a protective layer, and the bottom of the pond body is provided with a nutrient layer for the growth of deep-rooted plants;

[0008] a water treatment layer, the water treatment layer being arranged in the pool body and above the nutrient layer;

[0009] A gradient permeation layer is provided in the pool body, the gradient permeation layer is provided above the nutrient layer, deep-rooted plants are planted in the gradient permeation layer, and road seepage water passes through the gradient permeation layer and enters the water treatment layer for treatment;

[0010] A covering layer is provided on the top of the cell body, and the covering layer is provided on the top of the gradient permeation layer.

[0011] Preferably, the gradient osmosis layer includes a gradient osmosis layer lower layer, a gradient osmosis layer middle layer and a gradient osmosis layer upper layer arranged layer by layer from bottom to top, the gradient osmosis layer lower layer is arranged in contact with the top of the water treatment layer, and the gradient osmosis layer upper layer is in contact with the bottom end of the covering layer.

[0012] Preferably, the permeation porosity of the upper layer of the gradient permeation layer, the middle layer of the gradient permeation layer and the lower layer of the gradient permeation layer increases layer by layer.

[0013] Preferably, the water treatment layer includes a water retention layer provided on the nutrient layer, a water permeable layer is provided on the top of the water retention layer, and the top of the water permeable layer abuts against the bottom end of the lower layer of the gradient permeation layer.

[0014] Preferably, the permeable layer includes a porous support layer arranged between the water retention layer and the lower layer of the gradient permeation layer, and a plurality of permeable hoses are embedded side by side in the porous support layer. The permeable hoses in the plurality of pool bodies on the same side are connected to the sewer.

[0015] Preferably, a plurality of water-permeable holes are formed through the upper half of the water-permeable hose, and filter plugs are embedded in the water-permeable holes.

[0016] Preferably, the covering layer includes an improved planting soil layer and a surface covering layer arranged in sequence from bottom to top, and the improved planting soil layer covers the upper layer of the gradient permeability layer.

[0017] Preferably, the nutrient layer includes a vertical nutrient column arranged at the bottom of the pool body, the vertical nutrient column extends into the pool body and into the second rammed soil layer at the bottom of the inner cavity of the pool body, and an improved nutrient soil layer is arranged between the top of the second rammed soil layer and the bottom of the water retention layer.

[0018] Preferably, the protective layer includes a perimeter tooth surrounding the top of the pool body, and a first rammed earth layer, a concrete reinforcement layer and a cement mortar filling layer are arranged layer by layer from bottom to top between the bottom of the perimeter tooth and the ground, and the perimeter tooth is located above the cement mortar filling layer.

[0019] Preferably, the inner cavity top cover of the perimeter tooth is provided with an ecological water-permeable grate, and the ecological water-permeable grate is suspended above the surface covering layer.

[0020] Compared with the prior art, the present invention has the following advantages and technical effects: the present invention discloses a deep-rooted plant planting pool for intercepting road soil pollution, the pool body is in an inverted cone shape, and is arranged on the roadside green belt, so that the entire planting pool is arranged in the roadside green belt and integrated with the surrounding ecological environment. While purifying pollution, it can also play a role in greening, improve the road landscape effect, and promote ecological balance; a protective layer is provided on the outer periphery of the top of the pool body to prevent external factors from damaging the pool body, protect the internal structure and the plant growth environment; a nutrient layer is provided at the bottom of the pool body to provide sufficient nutrients for deep-rooted plants, and the inverted cone shape of the pool body is conducive to guiding water and plant roots to grow downward, and the synergistic effect of the pool body and each layer structure creates a good growth environment for plants, promotes the growth of deep-rooted plants, and enhances their resistance to pollution. purification capacity; from bottom to top in the pool body, there are nutrient layer, gradient infiltration layer, water treatment layer and covering layer. Deep-rooted plants are planted in the gradient infiltration layer, which can initially filter road seepage and intercept some pollutants. At the same time, deep-rooted plants use their own adsorption and degradation capabilities of pollutants, combined with the physical filtration effect of the gradient infiltration layer, to intercept pollutants in road seepage; water filtered by the gradient infiltration layer enters the treatment layer, and the water treatment layer combined with the gradient infiltration layer can store part of the water for the growth of deep-rooted plants; when there is a lot of rainfall, excess water overflows through the water treatment layer and is discharged into the sewer, reducing the entry of pollutants into the soil and groundwater, and effectively intercepting road soil pollution; the covering layer is set at the top of the pool body and the top of the gradient infiltration layer, which can reduce water evaporation and prevent debris from clogging the gradient infiltration layer.

[0021] The present invention adopts a combination of deep-rooted plants and layer-by-layer filtration to absorb residual pollutants, achieve vertical pollution interception and biodegradation, improve remediation efficiency, and combine engineering stability and ecological sustainability. It is suitable for soil remediation and greening quality improvement of high-pollution risk roads. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of this application. The exemplary embodiments and descriptions of this application are intended to explain this application and do not constitute an improper limitation on this application. In the accompanying drawings:

[0023] Figure 1 This is a schematic diagram of the structure of a deep-rooted plant planting pool for intercepting road soil pollution according to the present invention;

[0024] Figure 2 This is a schematic diagram of the top view of the perimeter teeth structure of the present invention;

[0025] Figure 3 Schematic diagram of the water-permeable layer structure of the present invention;

[0026] Figure 4 This is a schematic diagram of the surrounding tooth arrangement of the present invention;

[0027] Figure 5This is a schematic diagram of sewage flow in the present invention;

[0028] In the figure: 1. Peripheral teeth; 2. Cement mortar filling layer; 3. Concrete reinforcement layer; 4. First rammed earth layer; 5. Ecological permeable grate; 6. Surface covering layer; 7. Improved planting soil; 8. Upper layer of gradient infiltration layer; 9. Middle layer of gradient infiltration layer; 10. Lower layer of gradient infiltration layer; 11. Permeable layer; 12. Water retention layer; 13. Improved nutrient soil; 14. Vertical nutrient column; 15. Second rammed earth layer; 16. Porous support layer; 17. Permeable hose; 18. Permeable hole; 19. Filter plug; 20. Permeable cage; 21. Deep-rooted plants. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0030] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] Reference Figure 1-Figure 5 As shown, this embodiment provides a deep-rooted plant planting pool for intercepting road soil pollution, comprising:

[0032] The pond body is in the shape of an inverted cone and is opened on the roadside green belt. A protective layer is provided on the top periphery of the pond body, and a nutrient layer for the growth of deep-rooted plants 21 is provided at the bottom of the pond body;

[0033] A water treatment layer is provided in the tank body and is located above the nutrient layer;

[0034] Gradient infiltration layer, the gradient infiltration layer is arranged in the pool body, the gradient infiltration layer is arranged above the nutrient layer, deep-rooted plants 21 are planted in the gradient infiltration layer, and the seepage water from the road passes through the gradient infiltration layer and enters the water treatment layer for treatment;

[0035] The covering layer is arranged on the top of the pool body and the covering layer is arranged on the top of the gradient permeation layer.

[0036] The present invention discloses a deep-rooted plant planting pond for intercepting road soil pollution. The pond body is in an inverted cone shape and is arranged on a roadside green belt. The entire planting pond is arranged in the roadside green belt and integrated with the surrounding ecological environment. While purifying pollution, it can also play a greening role, improve the road landscape effect, and promote ecological balance. A protective layer is provided on the outer periphery of the top of the pond body to prevent external factors from damaging the pond body and protect the internal structure and the plant growth environment. A nutrient layer is provided at the bottom of the pond body to provide sufficient nutrients for deep-rooted plants 21. The inverted cone shape of the pond body is conducive to guiding water and plant roots to grow downward. The synergistic effect of the pond body and the various layer structures creates a good growth environment for plants, promotes the growth of deep-rooted plants 21, and enhances their pollution purification ability. The pool body is composed of a nutrient layer, a filter layer, a water treatment layer and a covering layer from bottom to top. Deep-rooted plants 21 are planted in the filter layer, which can initially filter road seepage and intercept some pollutants. At the same time, the deep-rooted plants 21 use their own adsorption and degradation capabilities of pollutants, combined with the physical filtration effect of the filter layer, to intercept pollutants in road seepage; the water filtered by the filter layer enters the treatment layer, and the water treatment layer combined with the filter layer can store some water for the growth of deep-rooted plants 21; and when there is a large amount of rainfall, excess water overflows through the water treatment layer and is collected in the sewer for discharge, reducing the entry of pollutants into the soil and groundwater, and effectively intercepting road soil pollution; the covering layer is arranged at the top of the pool body and the top of the filter layer, which can reduce water evaporation and prevent debris from clogging the filter layer. The present invention adopts a combination of deep-rooted plants 21 and layer-by-layer filtration to adsorb residual pollutants, achieve vertical pollution interception and biodegradation, improve remediation efficiency, and have both engineering stability and ecological sustainability. It is suitable for soil remediation and greening quality improvement of high-pollution risk roads.

[0037] In one embodiment of the present invention, the depth of the pool body is not less than 3m, and the minimum size of the top is 1.5m×1.5m.

[0038] A further optimized solution includes a gradient permeation layer comprising a lower gradient permeation layer 10, a middle gradient permeation layer 9, and an upper gradient permeation layer 8, arranged layer by layer from bottom to top. The lower gradient permeation layer 10 is arranged abutting the top of the water treatment layer, and the upper gradient permeation layer 8 is abutting the bottom of the cover layer. The lower gradient permeation layer 10, the middle gradient permeation layer 9, and the upper gradient permeation layer 8 of the filtration layer are arranged layer by layer from bottom to top. The seepage water passes through the upper gradient permeation layer 8, the middle gradient permeation layer 9, and the lower gradient permeation layer 10 in sequence. Each layer filters and adsorbs pollutants. Through layered filtration, the filtration effect is enhanced, pollutants are more effectively intercepted, and the water quality of the water treatment layer is guaranteed. When planting, deep-rooted plants 21 are mainly planted in the middle gradient permeation layer 9 to facilitate their root system to spread outward, forming a physical barrier that "blocks from above and loosens from below." Combining the water and nutrient gradients with the pollutant concentration gradient, and utilizing the biological characteristics of plant roots that "move towards water, nutrients, and avoid obstacles," the taproot can penetrate directionally from the shallow loose area to the deep polluted layer, ultimately constructing a deep root interception barrier.

[0039] In one embodiment of the present invention, the total thickness of the gradient permeation layer lower layer 10, the gradient permeation layer middle layer 9 and the gradient permeation layer upper layer 8 is ≥1.7 m.

[0040] Further optimizing the solution, the permeability porosity of the gradient permeation layer 8, the gradient permeation layer 9, and the gradient permeation layer 10 increases layer by layer. As the permeability porosity of the gradient permeation layer 8, the gradient permeation layer 9, and the gradient permeation layer 10 increases layer by layer, the seeping water is filtered in layers with increasing porosity, permeating downward more smoothly. At the same time, pollutants are gradually intercepted, which is more conducive to the flow of seeping water, improves filtration efficiency, and strengthens the adsorption and interception capabilities of pollutants.

[0041] In one embodiment of the present invention, the upper layer 8 of the gradient permeation layer comprises 40% humus soil + 30% zeolite + 10% organic fertilizer, has a porosity of 40%, and a thickness of about 0.5 m.

[0042] In one embodiment of the present invention, the middle layer 9 of the gradient permeation layer includes 30% biochar and 20% steel slag, has a porosity of 50%, and has a thickness of about 0.8 m.

[0043] In one embodiment of the present invention, the particle size of the steel slag is 10-20 mm, and the particle size of the biochar is 5-10 mm, which are mainly used to adsorb pollutants such as heavy metals.

[0044] In one embodiment of the present invention, the lower layer 10 of the gradient permeability layer includes 45% gravel and 10% volcanic rock, has a porosity of 60%, and has a thickness of about 0.4 m.

[0045] A further optimized solution is that the water treatment layer includes a water-retaining layer 12 disposed on the nutrient layer. A permeable layer 11 is disposed on top of the water-retaining layer 12, and the top of the permeable layer 11 abuts the bottom of the lower layer 10 of the gradient permeation layer. The water treatment layer includes the water-retaining layer 12 and the permeable layer 11. The permeable layer 11 maintains stable soil moisture in the planting pool through multiple functions such as water permeability, drainage, and erosion prevention, preventing street trees from rotting due to water accumulation or drought. The water-retaining layer 12 has a low water permeability, which can effectively reduce water penetration into the nutrient layer and maintain water content. The trace amount of permeated water can also soak the nutrient layer, causing the internal nutrients to overflow and facilitate absorption by deep-rooted plants 21. Water that has been filtered layer by layer enters the permeable layer 11 and then flows into the water-retaining layer 12. The water-retaining layer 12 stores water, maintaining the water demand and nutrient overflow demand of plant growth, avoiding water shortage and drought, while attracting roots to grow in moist areas. The permeable layer 11 can ensure water circulation, promptly drain excess water, and prevent water accumulation and root rot.

[0046] In one embodiment of the present invention, the water-retaining layer 12 is composed of humus, gravel, and coconut husk, which can effectively absorb part of the water and reduce the rate of water loss.

[0047] A further optimized solution includes a porous support layer 16 disposed between the water-retaining layer 12 and the lower layer 10 of the gradient permeation layer. Several permeable hoses 17 are embedded side by side within the porous support layer 16. The hoses 17 within several tanks on the same side are connected to the sewer. The permeable layer 11 consists of the porous support layer 16 disposed between the water-retaining layer 12 and the lower layer 10 of the gradient permeation layer, and the hoses 17 embedded within the porous support layer 16 and connected to the sewer. When there is a lot of water, excess water passes through the porous support layer 16 and enters the hoses 17, where it is collected and discharged into the sewer, preventing water accumulation, ensuring a suitable environment for plant growth, and avoiding damage to plants caused by excessive water.

[0048] In one embodiment of the present invention, a water-permeable hose 17 with an inner diameter of 100 mm is buried horizontally to facilitate the discharge of excess water.

[0049] As a further optimization, the upper half of the permeable hose 17 is perforated with a plurality of permeable holes 18, each of which is embedded with a filter plug 19. The permeable holes 18 with the filter plug 19 allow water to seep directly into the water-retaining layer 12 through the porous support layer 16 when the water level is low. When the water level is high, excess water enters the hose through the permeable holes 18 for easy drainage. The filter plug 19 further filters impurities from the water, improving filtration accuracy, reducing impurities from entering the sewer, and protecting the drainage system.

[0050] A further optimized solution includes a cover layer consisting of, from bottom to top, 7 layers of improved planting soil and a surface cover layer 6, which overlies the upper layer 8 of the gradient permeability layer. This cover layer, composed of 7 layers of improved planting soil and surface cover layer 6, protects the filtration layer, creating better conditions for plant growth and enhancing soil fertility. The porous structure of surface cover layer 6 provides initial pollutant interception while allowing for rapid rainwater infiltration, retaining soil moisture and air permeability, preventing soil compaction that reduces permeability, and protecting the underlying layer of improved planting soil 7, which is composed of humus and coconut coir.

[0051] In one embodiment of the present invention, the surface covering layer 6 comprises small stones and coarse wood chips, and its porosity is ≥20%.

[0052] A further optimized solution is that the nutrient layer includes a vertical nutrient column 14 arranged at the bottom of the pool body. The vertical nutrient column 14 extends into the pool body and into the second rammed soil layer 15 at the bottom of the inner cavity of the pool body. A layer of improved nutrient soil 13 is arranged between the top of the second rammed soil layer 15 and the bottom of the water retention layer 12. The nutrient layer includes a vertical nutrient column 14 and an improved nutrient soil layer 13. A second rammed soil layer 15 is arranged between the vertical nutrient column 14 and the improved nutrient soil 13. The vertical nutrient column 14 is perpendicular to the bottom of the pool and adopts a hollow concrete pipe with an inner diameter of 200mm and a length of 0.5m. The pipe wall is provided with spiral water-permeable holes 18, and the interior is filled with a slow-release nutrient matrix. Nutrients are transported to the deep roots through capillary action, and the bottom is connected to the groundwater level to form a water-based dual channel to provide sufficient nutrients for deep-rooted plants 21; ensure the stable growth of plant roots, and the root growth of deep-rooted plants 21 is guided by the vertical nutrient column 14 to continue to grow downward to intercept pollutants, avoiding lateral diffusion and pollution of the surrounding environment; and the improved nutrient soil 13 is composed of humus, compost, and leaf mold, of which coconut coir accounts for 20%, which can increase the total porosity of the soil to 55%-65% and reduce the root penetration resistance.

[0053] To further optimize the solution, the protective layer includes a tooth 1 surrounding the top of the pool body. Between the bottom of the tooth 1 and the ground, a first rammed earth layer 4, a concrete reinforcement layer 3, and a cement mortar filling layer 2 are arranged layer by layer from bottom to top, and the tooth 1 is located above the cement mortar filling layer 2. The protective layer consists of the tooth 1, the first rammed earth layer 4, the concrete reinforcement layer 3, and the cement mortar filling layer 2. The tooth 1 adopts a precast concrete structure, which is higher than the ground to form an anti-scour barrier. Combined with the cement mortar filling layer 2 and the concrete reinforcement layer 3, it has both compression and anti-subsidence functions, blocking external interference. Each layer enhances the stability of the pool body, protects the pool body, prevents external damage, and enhances the pool body's compression and anti-subsidence capabilities. The modular design adapts to road line splicing.

[0054] In one embodiment of the present invention, the ratio of the cement mortar filling layer 2 is 1:2.5.

[0055] In one embodiment of the present invention, a plurality of water-permeable cages 20 are provided around the periphery of the tooth 1, which can allow external water to flow into the pool body and prevent debris from entering the pool body.

[0056] To further optimize the solution, an ecological permeable grate 5 is provided at the top of the inner cavity of the tooth 1, and the ecological permeable grate 5 is suspended above the surface covering layer 6. The suspended ecological permeable grate 5 at the top of the inner cavity of the tooth 1 allows rainwater to pass through, preventing debris from entering the pool body and avoiding clogging by debris, ensuring the cleanliness of the pool body, maintaining the normal operation of each layer, and ensuring the safety of the soil ecology in the planting pool.

[0057] In one embodiment of the present invention, the compressive strength of the ecological permeable grate 5 is ≥50 MPa, which reduces soil compaction caused by pedestrians and vehicles and soil loss caused by rainwater erosion.

[0058] Processing process:

[0059] Refer to the attached Figure 4 As shown in the figure, first, pollutants such as oil, tire debris, and heavy metal particles generated by vehicle driving seep into the road surface or the soil of the planting pool. After being washed and infiltrated by rainwater runoff, they enter the upper layer of the planting pool and achieve initial sedimentation through the surface covering layer 6 with a porosity of 20%; the pollutants enter the upper layer of the gradient infiltration layer 8, and the zeolite selectively adsorbs the heavy metal Pb 2 + and Cd 2 +, humus microorganisms and the roots of deep-rooted plants 21 absorb and degrade organic matter; then, steel slag in the middle layer 9 of the gradient permeability layer absorbs residual heavy metals, and biochar provides microbial attachment sites. Finally, the lower layer 10 of the gradient permeability layer further filters suspended solids, and the porous structure of the volcanic rock promotes aerobic microbial activity. The permeable layer 11 drains water laterally, delivering purified water to the groundwater table to prevent waterlogging and contamination. The taproots of deep-rooted plants 21 penetrate the gradient permeability layer and come into contact with contaminated soil at a depth of 1.7m. Root hairs adsorb pollutants and secretions further remove pollutants. Root growth, guided by vertical nutrient columns 14, continues downward, intercepting pollutants and preventing lateral spread and contamination of the surrounding environment.

[0060] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0061] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by persons skilled in the art should fall within the scope of protection defined by the claims of the present invention.

Claims

1. A deep root plant planting pond for intercepting road soil pollution, characterized in that: include: A pond body, the pond body being in an inverted cone shape and being opened on a roadside green belt, the top periphery of the pond body being provided with a protective layer, and the bottom end of the pond body being provided with a nutrient layer for the growth of deep-rooted plants (21); a water treatment layer, the water treatment layer being arranged in the pool body and above the nutrient layer; A gradient infiltration layer is provided in the pool body, the gradient infiltration layer is provided above the nutrient layer, deep-rooted plants (21) are planted in the gradient infiltration layer, and water seepage from the road surface passes through the gradient infiltration layer and enters the water treatment layer for treatment; A covering layer is provided on the top of the cell body, and the covering layer is provided on the top of the gradient permeation layer.

2. The deep-rooted plant planting pond for intercepting road soil pollution according to claim 1 is characterized by: The gradient osmosis layer comprises a gradient osmosis layer lower layer (10), a gradient osmosis layer middle layer (9) and a gradient osmosis layer upper layer (8) arranged layer by layer from bottom to top, the gradient osmosis layer lower layer (10) is arranged in contact with the top of the water treatment layer, and the gradient osmosis layer upper layer (8) is in contact with the bottom end of the covering layer.

3. The deep-rooted plant planting pond for intercepting road soil pollution according to claim 2 is characterized by: The permeation porosity of the upper layer (8) of the gradient permeation layer, the middle layer (9) of the gradient permeation layer, and the lower layer (10) of the gradient permeation layer increases layer by layer.

4. The deep-rooted plant planting pond for intercepting road soil pollution according to claim 2 is characterized by: The water treatment layer comprises a water-retaining layer (12) arranged on the nutrient layer, a water-permeable layer (11) is arranged on the top of the water-retaining layer (12), and the top of the water-permeable layer (11) abuts against the bottom of the lower layer (10) of the gradient permeation layer.

5. The deep-rooted plant planting pond for intercepting road soil pollution according to claim 4 is characterized by: The permeable layer (11) includes a porous support layer (16) arranged between the water-retaining layer (12) and the lower layer (10) of the gradient permeation layer. A plurality of permeable hoses (17) are embedded side by side in the porous support layer (16). The permeable hoses (17) located in the plurality of tank bodies on the same side are connected to a sewer.

6. The deep-rooted plant planting pond for intercepting road soil pollution according to claim 5 is characterized by: A plurality of water-permeable holes (18) are formed through the upper half of the water-permeable hose (17), and filter plugs (19) are embedded in the water-permeable holes (18).

7. The deep-rooted plant planting pond for intercepting road soil pollution according to claim 2 is characterized by: The covering layer comprises an improved planting soil (7) layer and a surface covering layer (6) arranged in sequence from bottom to top, and the improved planting soil (7) layer covers the upper layer (8) of the gradient permeation layer.

8. The deep-rooted plant planting pond for intercepting road soil pollution according to claim 4 is characterized by: The nutrient layer comprises a vertical nutrient column (14) arranged at the bottom end of the pool body, the vertical nutrient column (14) extends into the pool body and into a second rammed soil layer (15) at the bottom end of the inner cavity of the pool body, and an improved nutrient soil (13) layer is arranged between the top end of the second rammed soil layer (15) and the bottom end of the water retention layer (12).

9. The deep-rooted plant planting pond for intercepting road soil pollution according to claim 7, characterized in that: The protective layer comprises a perimeter tooth (1) surrounding the top of the pool body, wherein a first soil ramming layer (4), a concrete reinforcement layer (3) and a cement mortar filling layer (2) are arranged layer by layer from bottom to top between the bottom of the perimeter tooth (1) and the ground, and the perimeter tooth (1) is located above the cement mortar filling layer (2).

10. The deep-rooted plant planting pond for intercepting road soil pollution according to claim 9, characterized in that: The inner cavity top cover of the perimeter tooth (1) is provided with an ecological water-permeable grate (5), and the ecological water-permeable grate (5) is suspended above the surface covering layer (6).

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