Street tree planting method capable of expanding root system range

Abstract

The invention provides a border tree planting method capable of expanding a root system range. The method comprises the following steps: digging a planting belt of border trees on the side of a road; setting out and fixing points to determine a planting area and a permeable supporting area of each border tree; laying a supporting module at the bottom of the planting belt, wherein the supporting module is located in the permeable supporting area; base fertilizer is applied to the bottom of the planting area and covered with thin soil; placing trees in the planting area; tensioning assemblies are pre-embedded in the four corners of the tree soil ball; root blocking plates are laid on the two sides, parallel to the road, of the planting belt and the top sides of the supporting modules; preparing special planting soil, and backfilling the planting area and the permeable supporting area with the special planting soil; and a permeable pavement is laid above the supporting module, a plant pit cover plate is installed above the soil ball, and the plant pit cover plate is connected with a tensioning assembly. The problems that the root growth space of border trees is limited, the root distribution range is insufficient, roads and pipelines are damaged by roots, and water permeability and air permeability of root soil become poor after long-term compression can be solved.

Description

Technical Field

[0001] The present application relates to the technical field of tree planting, and in particular to a method for planting street trees with an expanded root system. Background Art

[0002] Street trees refer to trees planted on both sides of the road in a certain pattern. Street trees are important green infrastructure in the city and play an important role in creating a beautiful environment and improving the ecological environment. The current planting method of street trees is mainly tree pit planting, and the tree pit specifications are usually 1.5×1.5m square tree pits. This planting method has the following problems: First, the tree pit is small, the root distribution range is insufficient, and there is a lack of guidance for the root growth, resulting in a "top-heavy" phenomenon when the tree grows up, which easily leads to the risk of tree lodging; Second, there is insufficient effective soil in the tree pit, and the soil nutrient content is low; the surrounding area is sealed by hardened pavement, and the root soil has been under external pressure for a long time, resulting in poor physical and chemical properties such as permeability and air permeability, which is not conducive to the healthy growth of trees in the long run, resulting in poor flowering quality of flowering trees and inability to fully realize the value of trees; Third, in South China, trees with well-developed root systems, represented by banyan trees, have difficulty growing downwards and can only grow across the tree pit on the surface layer, often damaging the pavement layer of the sidewalk and causing the road surface to arch. Some well-developed roots enter the municipal pipeline, seriously affecting the safety of the municipal pipeline; Fourth, due to the limited space for root growth, the anchoring force provided by the roots is insufficient, and tree support frames need to be installed for a long time, affecting the landscape effect and occupying sidewalk space.

[0003] The existing measures to improve the planting method of street trees mainly include expanding the tree pit to improve soil permeability and air permeability; removing the ground cover or turf planted in the tree pit, and replacing it with a well-shaped grass brick or scattered pebbles (gravel) to improve the air permeability and water permeability of the tree pit; improving the soil in a small area in the tree pit to increase the frequency of fertilization, burying microbial slow-release fertilizers to increase soil nutrients in a short time. The above measures can work in a short period of time, but they cannot fundamentally solve the problems of limited root growth space, lack of guidance for root growth, resulting in insufficient root distribution range, poor soil physical and chemical properties, and root damage to roads and municipal pipelines. The current street tree planting method is not conducive to the healthy growth of trees in the long run, cannot fully realize the value of trees, and has also caused some negative impacts on the overall urban landscape, so it needs to be improved. Summary of the invention

[0004] In order to improve the problems of limited root growth space, insufficient root distribution range, poor soil physical and chemical properties, and root damage to roads and pipelines of street trees, the present application provides a street tree planting method that expands the root range.

[0005] The present application provides a method for planting roadside trees with an expanded root system, which adopts the following technical solution: A method for planting roadside trees to expand the root system range comprises the following steps: Dig a planting strip for street trees on the side of the road; Laying out lines and fixing points to determine the planting area and permeable support area of ​​each street tree, and setting the planting area and the permeable support area alternately; Laying a support module at the bottom of the planting belt, wherein the support module is located in the permeable support area; Apply basal fertilizer to the bottom of the planting area and cover with a thin layer of soil; placing trees within said planting area; Pre-embed the tensioning components at the four corners of the tree soil ball; Root blocking plates are laid on both sides of the planting belt parallel to the road and on the top side of the support module; Providing special planting soil, and backfilling the special planting soil in the planting area and the permeable support area; Laying permeable pavement above the support module, wherein the permeable pavement is located within the permeable support area; A tree pit cover is installed above the soil ball, and the tree pit cover is connected to the tensioning assembly.

[0006] By adopting the above technical scheme, the alternating planting area and permeable support area improve the air permeability and water permeability of the soil, which is conducive to the healthy growth of the root system. The laying of the support module enhances the stability and bearing capacity of the soil structure, while ensuring the permeability. The application of base fertilizer at the bottom of the planting area and covering it with a thin soil improves the soil nutrient status, promotes the root system to absorb nutrients, and increases the healthy growth rate of trees. The pre-buried tensioning components are connected to the tree hole cover to improve the stability of the trees. The laying of the root barrier plate limits the tendency of the roots to grow to both sides of the planting belt, reduces the situation of damaging the pavement layer of the sidewalk and causing the pavement to arch, promotes the root system to develop downward, increases the depth of the root system, and can significantly expand the root distribution range of street trees, enhance the stability of trees, and reduce the risk of lodging. The use of special planting soil optimizes the soil structure and further improves the root growth environment. The permeable paving structure not only ensures the infiltration of rainwater, but also maintains the convenience and safety of pedestrians. While achieving the healthy growth of street trees, this application takes into account the aesthetic needs of the city and solves the various defects of the existing street tree planting methods.

[0007] Optionally, before laying the support module, a drainage pipe is pre-buried on the bottom side of the planting belt, and a plurality of water inlet holes are opened on the circumference of the drainage pipe.

[0008] By adopting the above technical solution, excess rainwater in the soil enters the drainage pipe through the water inlet hole, which can significantly improve the drainage performance in the planting belt, reduce the long-term immersion of the roots in water, and improve the air permeability of the roots, which is beneficial to the healthy growth of the roots of street trees and reduces root diseases caused by excessive water.

[0009] Optionally, after laying the root barrier board, a vertical deep air permeable pipe is pre-buried, and a plurality of air permeable holes are opened around the deep air permeable pipe.

[0010] By adopting the above technical solution, the deep air permeable tube can significantly improve the air permeability in the planting belt, promote the oxygen supply to the root system, thereby enhancing the vitality of the root system and improving the overall health level and growth rate of the tree. The design of the deep air permeable tube effectively solves the problem of poor soil permeability in traditional planting methods.

[0011] Optionally, the supporting module includes a module base plate, a module upper plate and a limiting plug rod, the module base plate is plugged into the module upper plate, the module base plate is provided with a plurality of adjustment holes, the limiting plug rod is inserted into the adjustment holes, and the limiting plug rod locks the positions of the module base plate and the module upper plate.

[0012] By adopting the above technical solution, when the limiting rod is inserted into different adjustment holes, the position of the module bottom plate and the module upper plate can be locked, thereby locking the height of the support module, thereby facilitating adjusting the support module to a suitable height.

[0013] Optionally, the limit rod includes a first rod and a second rod, the first rod and the second rod are threadedly connected, the first rod and the second rod are respectively inserted into the adjustment holes of the adjacent module base plates, the ends of the first rod and the second rod are connected to limit stop rings, and the limit stop rings abut against the module upper plate.

[0014] By adopting the above technical solution, when the first plug rod and the second plug rod are screwed, the length of the limit plug rod can be changed, so that the limit ring abuts against the upper plate of the module, thereby adjusting the spacing between adjacent support modules. The limit plug rod can apply force to the adjacent support modules, making the spacing between adjacent support modules more stable.

[0015] Optionally, the steps of backfilling the special planting soil include: The first backfill is with special planting soil, the backfill height should cover the support module and part of the soil ball; Water the planting strips thoroughly; After the first backfill of special planting soil has settled naturally, the second backfill of special planting soil is carried out, with the backfill height being higher than the ground height, and then the second backfill soil is allowed to settle to a height lower than the ground height.

[0016] By adopting the above technical solution, the special planting soil is backfilled twice to ensure that the special planting soil can fully fill the gaps between the planting area and the permeable support area, reduce the settlement of the special planting soil after watering, and cause gaps around the soil ball, thereby enhancing the stability of the trees. Backfilling the special planting soil is conducive to the stable laying of the permeable pavement and reduces soil loss, thereby improving the overall stability of the street trees.

[0017] Optionally, the tensioning assembly includes anchor rods and cables, the anchor rods are inserted at the four corners of the soil ball, and the cables are respectively connected to the anchor rods and the tree hole cover.

[0018] By adopting the above technical solution, the anchor rod is connected to the tree hole cover through a cable, thereby being able to effectively provide a stable pulling force, stabilize the soil above the soil ball, ensure the stability of the tree during its growth process, and reduce the tree from falling over due to unstable root system.

[0019] Optionally, the tree hole cover includes a cover body, the cover body is provided with a countersunk hole; the tensioning assembly also includes an insertion tube, the insertion tube is inserted into the countersunk hole, the top end of the insertion tube has an abutment edge, the side wall of the countersunk hole has a supporting edge, and the abutment edge of the insertion tube presses the supporting edge.

[0020] By adopting the above technical solution, the insertion tube is inserted from the sinking platform hole to the periphery of the soil ball, and the abutment edge is pressed against the support edge, which can improve the stability of the cover plate body and further improve the stability of the soil ball.

[0021] Optionally, the cover plate body is connected to a guide rod, and the cable passes around the guide rod and then passes between the supporting edge and the abutting edge, and the supporting edge and the abutting edge press the cable.

[0022] By adopting the above technical solution, the cable passes around the guide rod and passes between the supporting edge and the abutting edge. The cable is then tightened to put it in a taut state, and the supporting edge presses the cable against the abutting edge, so that the cable remains in a taut state, thereby improving the stability of the cover body.

[0023] Optionally, a sealing cover is threadedly connected to the inner surface of the sink hole, the sealing cover is pressed against the top end of the insertion tube, and a plurality of air-permeable and water-conducting holes are provided on the sealing cover and the circumferential side wall of the insertion tube.

[0024] By adopting the above technical solution, the cover is screwed into the sinking hole, and the cover is pressed against the top of the insertion tube, thereby fixing the position of the insertion tube, making the position of the insertion tube more stable. The air-permeable water-conducting holes of the cover and the insertion tube can facilitate the transport of water and air around the soil ball, which is beneficial to the growth of the root system.

[0025] In summary, the present application includes at least one of the following beneficial effects: 1. Laying support modules enhances soil structural stability and bearing capacity while ensuring water permeability. Applying base fertilizer at the bottom of the planting area and covering it with thin soil improves soil nutrient conditions, promotes root absorption of nutrients, and increases the healthy growth rate of trees. The use of special planting soil optimizes soil structure and further improves the root growth environment.

[0026] 2. The laying of root barrier plates limits the tendency of roots to grow toward both sides of the planting belt, reduces the damage to the pavement layer of the sidewalk and causes the pavement to arch, encourages the roots to grow downward, increases the depth of the roots, and can significantly expand the root distribution range of street trees, enhance tree stability, and reduce the risk of lodging.

[0027] 3. By pre-embedding the tensioning components and connecting them to the tree pit cover, it can effectively provide a stable pulling force, stabilize the soil ball and the soil above the soil ball, and ensure the stability of the tree during its growth process. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the top view structure of the road and planting belt in Example 1 of the present application; Figure 2 This is a schematic diagram of the structure of the planting area and the permeable support area of ​​Example 1 of the present application; Figure 3 This is a partial structural diagram of the planting area and the permeable support area of ​​Example 1 of the present application; Figure 4 yes Figure 3 Schematic diagram of the cross-section structure of AA; Figure 5 This is a schematic diagram of the local structure of the planting area highlighted in Example 2 of the present application; Figure 6 It is a schematic diagram of the cross-section structure of the tree pit cover plate of Example 2 of the present application; Figure 7 is a partial structural schematic diagram highlighting the sealing cover and the insertion tube of Example 2 of the present application; Figure 8 is a schematic cross-sectional structural diagram of a support module in Example 3 of the present application; Fig. 9 It is a schematic diagram of the cross-sectional structure of adjacent support modules in Example 3 of the present application.

[0029] Explanation of the accompanying drawings: 1. Planting belt; 11. Planting area; 12. Permeable support area; 2. Support module; 21. Module bottom plate; 211. Adjustment hole; 22. Module upper plate; 23. Limiting rod; 231. First rod; 232. Second rod; 24. Limiting baffle ring; 3. Permeable pavement; 4. Root blocking plate; 5. Deep air pipe; 6. Drain pipe; 7. Tree hole cover; 71. Cover body; 711. Sinking platform hole; 712. Support edge; 72. Cover; 73. Guide rod; 8. Tensioning assembly; 81. Anchor rod; 82. Cable; 83. Insertion tube; 831. Abutment edge; 100. Road; 200. Tree; 201. Soil ball. DETAILED DESCRIPTION

[0030] The following is combined with Figure 1-9 This application is described in further detail.

[0031] Embodiment 1: Embodiment 1 of the present application provides a method for planting roadside trees with an expanded root system, comprising the following steps: Step S1: Reference Figure 1 , collect soil samples from the roadside tree planting area in layers, test soil physical and chemical indicators, and analyze soil quality. The tested soil physical and chemical indicators include pH, electrical conductivity, organic matter content, hydrolyzable nitrogen content, available phosphorus content, available potassium content, density, bulk density and aeration.

[0032] Step S2: Reference Figure 1 and Figure 2 , a planting belt 1 of roadside trees is excavated on both sides of the road 100. In this embodiment, the planting belt 1 has a width of not less than 1.2 m and a depth of not less than 1.2 m. After the planting belt 1 is excavated, the bottom of the planting belt 1 is trimmed and leveled. The excavation process is carried out by an excavator to ensure excavation efficiency and quality.

[0033] Step S3: Laying out lines and fixing points to determine the planting area 11 and the permeable support area 12 of each roadside tree, so that the planting area 11 and the permeable support area 12 are arranged alternately.

[0034] Step S4: Reference Figure 2 and Figure 3 The drainage pipe 6 is pre-buried at the bottom of the planting belt 1. A plurality of water-permeable holes are opened on the circumferential side wall of the drainage pipe 6. The moisture in the soil enters the drainage pipe 6 through the water-permeable holes, thereby draining away excess moisture in the soil, reducing the root rot of trees caused by excessive moisture in the soil, and facilitating the growth of trees.

[0035] Step S5: Reference Figure 3 and Figure 4, a support module 2 is laid at the bottom of the planting belt 1, and the support module 2 is located in the permeable support area 12. The support module 2 is specifically made of I-shaped bricks formed by cement pouring, and a plurality of I-shaped bricks are stacked at the bottom of the planting belt 1. The I-shaped bricks are stacked upward in three layers, and the I-shaped bricks located on the same horizontal plane are arranged at intervals. The I-shaped bricks have high structural strength and also have certain permeability.

[0036] Step S6: Apply base fertilizer to the bottom side of the planting area 11 and cover it with a thin layer of soil, the soil covering thickness is about 1 cm.

[0037] Step S7: Place the tree 200 in the planting area 11 and make the soil ball 201 of the tree 200 located above the thinner soil covered in step S6.

[0038] Step S8: setting a tensioning assembly 8 at the four corners of the soil ball 201 , the tensioning assembly 8 comprising an anchor rod 81 and a cable 82 , the anchor rod 81 is obliquely inserted into the soil at the four corners of the soil ball 201 , and the cable 82 is fixedly connected to the top of the anchor rod 81 .

[0039] Step S9: Root blocking plates 4 are laid on both sides of the planting belt 1 parallel to the road 100 and on the top side of the support module 2. The root blocking plates 4 can overlap each other. The root blocking plates 4 include geogrids and geotextiles, which are bonded to form the root blocking plates 4. The root blocking plates 4 can reduce the growth of the roots of the trees 200 toward the road 100 and ensure their water permeability and air permeability.

[0040] Step S10: prepare special planting soil and backfill the special planting soil. The special planting soil includes greening waste compost, humus, organic fertilizer, ceramsite and common planting soil.

[0041] The first backfill of the special planting soil is performed so that the backfill height covers the support modules 2 and part of the soil ball 201 , and the special planting soil is filled between adjacent support modules 2 .

[0042] Then, the planting belt 1 is fully watered, and after the first backfill of special planting soil settles naturally, the second backfill of special planting soil is carried out, and the backfill height is higher than the ground height, and then the second backfill soil is allowed to settle to a height slightly lower than the ground height.

[0043] Step S11: Lay the permeable pavement 3 above the root blocking plate 4 on the top side of the support module 2, that is, the permeable pavement 3 is located in the permeable support area 12. The permeable pavement 3 includes a plurality of permeable concrete bricks, each of which is provided with 4-16 permeable holes. The permeable pavement 3 has good air permeability and water permeability, is durable and does not affect pedestrian activities. The deep air pipe 5 should pass through the permeable pavement 3, and the deep air pipe 5 is flush with the top side of the permeable pavement 3. Due to the provision of the root blocking plate 4, the roots of the trees can be encouraged to grow toward the permeable support area 12 and downward, thereby increasing the growth range of the roots. The deep air pipe 5 can improve the air permeability and water permeability of the deep layer of the permeable support area 12, which is beneficial to the growth of the roots.

[0044] Step S12: Cover the top side of the soil ball 201 of the tree 200 with a tree pit cover 7, and fix the cable 82 to the tree pit cover 7. Each tree 200 corresponds to two tree pit covers 7, each tree pit cover 7 corresponds to two cables 82, and the two tree pit covers 7 surround the bottom of the trunk of the tree 200.

[0045] Step S13: dilute the root promoter to 600-800 times and then water around the tree 200 .

[0046] The implementation principle of a method for planting street trees to expand the root range in Example 1 of the present application is as follows: through a series of steps of detecting and analyzing soil physical and chemical indicators and soil quality, excavating a street tree planting belt 1, laying out lines and fixing points, setting up drainage pipes 6, laying support modules 2, applying base fertilizer, placing trees 200, pre-burying tensioning components 8, laying root barrier boards 4, backfilling special planting soil, laying permeable pavement 3, installing tree hole covers 7 and pouring root promoters, the root range of the trees 200 is effectively expanded, the possibility of the roots causing damage to the sidewalk pavement layer is reduced, and the durability of the pavement is improved.

[0047] Embodiment 2: Embodiment 2 of the present application provides a method for planting roadside trees with an expanded root system. The difference between Embodiment 2 of the present application and Embodiment 1 is that: Step S12 further specifically includes: refer to Figure 5 and Figure 6 The tree hole cover 7 includes a cover body 71 , a guide rod 73 and a cover 72 , and the tensioning assembly 8 also includes an insertion tube 83 .

[0048] refer to Figure 6 and Figure 7 The four corners of the cover body 71 are provided with countersunk holes 711. The insertion tube 83 passes through the countersunk holes 711 and then goes down and is located around the soil ball 201. The top of the insertion tube 83 has an abutment edge 831, and the side wall of the countersunk hole 711 has a supporting edge 712. The abutment edge 831 of the insertion tube 83 can press the supporting edge 712 tightly.

[0049] refer to Figure 6 and Figure 7 The guide rod 73 is fixedly connected to the cover body 71, and the guide rod 73 is arranged horizontally. The cable 82 passes through the support edge 712 and the abutment edge 831 after passing around the guide rod 73, and the end of the cable 82 passes through the side of the cover body 71. The end of the cable 82 is pulled to tighten the cable 82, and then the insertion tube 83 is inserted into the sink hole 711, so that the abutment edge 831 and the support edge 712 press the cable 82, thereby fixing the cable 82, so that the cable 82 is always in a tightened state.

[0050] refer to Figure 6 and Figure 7 The cover 72 is threadedly connected to the sink hole 711. By twisting the cover 72, the cover 72 can be pressed against the top of the insertion tube 83, so that the connection between the insertion tube 83 and the cover body 71 is more stable. The cover 72 and the insertion tube 83 are hollow inside, and the circumferential side walls of the cover 72 and the insertion tube 83 are provided with a plurality of air-permeable and water-conducting holes. The air-permeable and water-conducting holes can improve the air permeability around the soil ball 201, which is beneficial to the root growth of the tree 200. When it rains, part of the rainwater penetrates into the soil ball 201 of the tree 200, and part of the rainwater enters the soil around the soil ball 201 through the air-permeable and water-conducting holes, which is beneficial for the root system of the tree 200 to absorb water.

[0051] The implementation principle of the roadside tree planting method for expanding the root range in Example 2 of the present application is as follows: in step S12, firstly, the cable 82 is passed around the guide rod 73 and then passed through the top side of the support edge 712, then the cable 82 is tightened, and then the insertion tube 83 is inserted into the sinking hole 711, and then the abutting edge 831 is pressed against the cable 82 and the support edge 712. Finally, the cover 72 is screwed into the sinking hole 711, so that the cover 72 presses against the abutting edge 831 of the insertion tube 83.

[0052] Embodiment 3: Embodiment 3 of the present application provides a method for planting street trees with an expanded root system. The difference between Embodiment 3 of the present application and Embodiment 2 is that: refer to Figure 8 and Fig. 9 The support module 2 includes a module bottom plate 21, a module upper plate 22, a limit rod 23 and a limit ring 24. The module upper plate 22 is provided with a slot, and the module bottom plate 21 is inserted into the slot of the module upper plate 22, so that the module bottom plate 21 and the module upper plate 22 are close to or away from each other, and the height of the support module 2 can be adjusted.

[0053] refer to Figure 8 and Fig. 9The limiting plug rod 23 includes a first plug rod 231 and a second plug rod 232. The first plug rod 231 is inserted into the second plug rod 232, and the first plug rod 231 and the second plug rod 232 are threadedly connected. The module bottom plate 21 is provided with a plurality of adjustment holes 211 in the vertical direction, and the first plug rod 231 and the second plug rod 232 can be inserted into the adjustment holes 211. A plurality of limiting stop rings 24 are provided, and the limiting stop rings 24 are fixedly connected to the ends of the first plug rod 231 and the second plug rod 232, respectively.

[0054] The implementation principle of the roadside tree planting method for expanding the root range in Example 3 of the present application is as follows: when the first plug rod 231 and the second plug rod 232 are inserted into the adjustment holes 211 of the adjacent module bottom plates 21, the adjacent module upper plates 22 can respectively abut against the first plug rod 231 and the second plug rod 232, thereby limiting the height of the support module 2. Then, the first plug rod 231 and the second plug rod 232 are screwed to adjust the length of the limit plug rod 23, thereby adjusting the distance between adjacent support modules 2.

[0055] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A method for planting roadside trees to expand the root system, characterized in that: The following steps are involved: Excavating a planting strip (1) for roadside trees on the side of the road (100); Laying out lines and fixing points to determine the planting area (11) and the water-permeable support area (12) of each roadside tree, and arranging the planting area (11) and the water-permeable support area (12) alternately; A support module (2) is laid at the bottom of the planting belt (1), and the support module (2) is located in the water-permeable support area (12); Applying basal fertilizer at the bottom of the planting area (11) and covering it with a thin layer of soil; Placing trees (200) in the planting area (11); Pre-embed tensioning components (8) at the four corners of the soil ball (201) of the tree (200); Root blocking plates (4) are laid on both sides of the planting belt (1) parallel to the road (100) and on the top side of the support module (2); Providing special planting soil, and backfilling the special planting soil in the planting area (11) and the permeable support area (12); Laying a permeable pavement (3) above the support module (2), wherein the permeable pavement (3) is located within the permeable support area (12); A tree pit cover plate (7) is installed above the soil ball (201), and the tree pit cover plate (7) is connected to the tensioning assembly (8).

2. A method for planting roadside trees to expand the root system according to claim 1, characterized in that: Before laying the support module (2), a drainage pipe (6) is pre-buried on the bottom side of the planting belt (1), and a plurality of water inlet holes are provided on the circumference of the drainage pipe (6).

3. A method for planting roadside trees to expand the root system according to claim 1, characterized in that: After laying the root barrier plate (4), a vertical deep-layer air permeable pipe (5) is pre-buried, and a plurality of air permeable holes are opened around the deep-layer air permeable pipe (5).

4. A method for planting roadside trees to expand the root system according to claim 1, characterized in that: The support module (2) comprises a module bottom plate (21), a module top plate (22) and a limit rod (23); the module bottom plate (21) is plugged into and matched with the module top plate (22); the module bottom plate (21) is provided with a plurality of adjustment holes (211); the limit rod (23) is inserted into the adjustment holes (211); and the limit rod (23) locks the positions of the module bottom plate (21) and the module top plate (22).

5. A method for planting roadside trees to expand the root system according to claim 4, characterized in that: The limiting plug rod (23) comprises a first plug rod (231) and a second plug rod (232), the first plug rod (231) and the second plug rod (232) being threadedly connected, the first plug rod (231) and the second plug rod (232) being respectively inserted into the adjustment holes (211) of the adjacent module bottom plates (21), the ends of the first plug rod (231) and the second plug rod (232) being connected to a limiting stop ring (24), the limiting stop ring (24) being in contact with the module upper plate (22).

6. A method for planting roadside trees to expand the root system according to claim 1, characterized in that: The steps for backfilling special planting soil include: Backfilling the special planting soil for the first time, the backfill height is high enough to bury the support module (2) and part of the soil ball (201); Provide sufficient water in the planting zone (1); After the first backfill of special planting soil has settled naturally, the second backfill of special planting soil is carried out, with the backfill height being higher than the ground height, and then the second backfill of special planting soil is allowed to settle to a height lower than the ground height.

7. A method for planting roadside trees to expand the root system according to claim 1, characterized in that: The tensioning assembly (8) comprises an anchor rod (81) and a pull cable (82), wherein the anchor rod (81) is inserted into the four corners of the soil ball (201), and the pull cable (82) is respectively connected to the anchor rod (81) and the tree hole cover plate (7).

8. A method for planting roadside trees to expand the root system according to claim 7, characterized in that: The tree hole cover (7) comprises a cover body (71), the cover body (71) being provided with a sink hole (711); the tensioning assembly (8) further comprises an insertion tube (83), the insertion tube (83) being inserted into the sink hole (711), the top end of the insertion tube (83) being provided with an abutment edge (831), the side wall of the sink hole (711) being provided with a support edge (712), the abutment edge (831) of the insertion tube (83) pressing the support edge (712).

9. A method for planting roadside trees to expand the root system according to claim 8, characterized in that: The cover plate body (71) is connected to a guide rod (73), and the cable (82) passes around the guide rod (73) and then passes between the support edge (712) and the abutment edge (831), and the support edge (712) and the abutment edge (831) press the cable (82).

10. A method for planting roadside trees to expand the root system according to claim 9, characterized in that: The sink hole (711) is internally threadedly connected to a sealing cover (72), the sealing cover (72) is pressed against the top end of the insertion tube (83), and the circumferential side walls of the sealing cover (72) and the insertion tube (83) are both provided with a plurality of air-permeable and water-conducting holes.

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