Rejuvenation method for poor growth vigor of border trees in hardened earth surface environment

Abstract

The invention discloses a rejuvenation method for poor growth vigor of border trees in a hardened earth surface environment. The rejuvenation method comprises the steps that original soil with the thickness of 15-20 cm in a border tree pool is removed; 4-8 holes are vertically and evenly drilled in the tree pool with the tree trunk as the center, and vertical blind pipes are arranged in the holes; 2-6 slow-release rod fertilizers are uniformly implanted into the tree pool; a permeable layer with the thickness of 15-20 cm is laid on the surface of soil in the tree pool; communicating blind ditches a are formed between the adjacent border trees, and blind pipes a are laid in the communicating blind ditches; communicating blind ditches b are arranged along the communicating blind ditches a every 30-50 m, one ends of the communicating blind ditches b are connected with the communicating blind ditches a, the other ends of the communicating blind ditches b lead to a municipal drainage well, and blind pipes b are laid in the communicating blind ditches b; and rejuvenation liquid is added into the vertical blind pipes in the tree pool. The invention provides a three-in-one rejuvenation system of three-dimensional ventilation, targeted oxygen supply and longitudinal communication, and the growth vigor of the border trees is greatly improved.

Description

Technical Field

[0001] This invention belongs to the field of landscape seedling rejuvenation technology, specifically relating to a method for rejuvenating poor growth of street trees in hardened surface environments. Background Technology

[0002] Street trees (such as London plane trees, ash trees, Chinese scholar trees, and goldenrain trees) are an important part of urban landscaping, providing not only shade and beautifying the environment, but also purifying the air, regulating the microclimate, and reducing wind and noise. As a component of a sustainable urban environment, street trees make significant contributions to climate regulation, human health, and habitat improvement. Most street trees are planted in rectangular tree pits, 1.2-1.5 meters long and wide, surrounded by a load-bearing roadbed made of 3:7 lime-soil mixture. This hardened space makes each street tree appear as if it were planted in an individual large flowerpot. Pedestrian traffic causes the soil in the tree pits to become dense, hindering water infiltration and leading to waterlogging. Simultaneously, the 3:7 lime-soil roadbed surrounding the tree pits also restricts root growth. Deep watering and limited root growth for street trees are pressing problems that need to be addressed. Currently, conventional methods for rejuvenating roadside trees, such as increasing the size of tree pits, soil improvement, applying fertilizer, and drilling ventilation holes in the tree pits, are not very effective due to their simplistic approach or limitations imposed by terrain and other practical conditions. Summary of the Invention

[0003] This invention aims to at least partially solve one of the technical problems in related technologies. To this end, this invention provides a method for rejuvenating poor growth of roadside trees in hardened surface environments. This method proposes a three-in-one rejuvenation system of "three-dimensional aeration - targeted nutrition - vertical connectivity". Through processes such as drilling for oxygenation, root system ecological reconstruction, and dynamic nutrient regulation, the growth vigor of roadside trees is greatly improved.

[0004] This invention provides a method for rejuvenating poor growth of street trees in hardened surface environments, comprising the following steps: (1) Remove the original soil layer of 15-20cm in the tree pit of the roadside trees; drill 4-8 vertical holes evenly in the tree pit with the trunk as the center; install vertical blind pipes in the holes; and plant 2-6 slow-release fertilizer sticks evenly in the tree pit with the trunk as the center. (2) Lay a 15-20cm thick permeable layer on the soil surface in the tree pit. The permeable layer includes a fine sand layer above the soil surface and a saltpeter layer above the fine sand layer. (3) Using the line connecting adjacent roadside trees as the center line, remove the original sidewalk paving on the center line; set up connecting blind drains a between adjacent roadside trees, and lay blind pipes a in the connecting blind drains; along the connecting blind drains a, set up connecting blind drains b every 30-50m, with one end of the connecting blind drains b connected to the connecting blind drains a and the other end leading to the municipal drainage well, backfill the soil, lay blind pipes b in the connecting blind drains b, and restore the surface sidewalk paving or green space; (4) Add rejuvenation solution to the vertical blind tubes in the tree pit.

[0005] In some embodiments, when drilling holes in the tree pit, the drilling depth is 1.2-1.5m and the hole diameter is 10cm; the vertical blind pipes are 63mm in diameter, with the upper end of the vertical blind pipes extending 15-20cm above the soil surface in the tree pit and the lower end reaching the bottom of the hole. With this design, the vertical blind pipe group can extend into the deep root zone, ensuring the aeration of the deep root system.

[0006] In some embodiments, the vertical blind tube is filled with perlite inside and out. The microporous structure of the perlite provides capillary channels for water conduction and aeration for the roots of roadside trees. Furthermore, the tube body of the vertical blind tube is a spiral corrugated tube with a corrugated wall. At the troughs, there are breathable micropores with a diameter of 2-5 mm, which increase air permeability. Fine yarn (such as wool or polyester yarn) is spirally wound around the troughs to prevent impurities from clogging the micropores while ensuring air permeability. Furthermore, the upper end of the vertical blind tube is fitted with a cap, and the lower end is wrapped with a water-permeable non-woven fabric.

[0007] In this embodiment of the invention, the permeable layer is divided into a fine sand layer and a rock salt layer. The permeable layer is located on the upper layer of the tree pit and can store some rainwater or drain water. Furthermore, the fine sand layer is below and the rock salt layer is above. The fine sand layer is located between the soil and the rock salt layer and can play a buffering role to prevent soil particles from entering the rock salt layer and affecting the water permeability and air permeability of the rock salt layer.

[0008] In some embodiments, the permeable layer comprises a 5-8 cm layer of fine sand and a 10-12 cm layer of potassium nitrate, with the potassium nitrate having a particle size of 0.8-1.5 cm. Tree grates are then laid on top of the potassium nitrate layer. This ensures the aeration of the tree pit soil while preventing soil compaction caused by pedestrians walking on it.

[0009] In some embodiments, The slow-release bar fertilizer has a diameter of about 3cm and a length of about 13cm, and its composition is N:P2O5:K2O=15:15:15.

[0010] Slow-release fertilizer can provide a nitrogen source to initiate the rejuvenation process in the early stages, and provide phosphorus and potassium fertilizer to promote root lignification in the middle stages of rejuvenation.

[0011] Furthermore, the slow-release fertilizer sticks are implanted in 2-6 sticks according to the diameter at breast height (DBH) of the roadside trees. The amount of fertilizer is adjusted according to the DBH of the trees. For trees with a DBH of about 10cm, 2 sticks are implanted. For every 10cm increase in DBH, 1-2 more sticks are added. When applying the fertilizer, first make holes in the root zone of the tree, with a depth of 40-60cm and a diameter of about 4cm. Then, inject the fertilizer sticks into the holes and cover them with an appropriate amount of soil. The fertilizer application points should be evenly distributed around the tree roots. This fertilization method not only meets the tree's nutrient needs but also improves the soil permeability.

[0012] Furthermore, the slow-release fertilizer sticks are implanted at the outer edge of the tree pit, while maintaining a distance of at least 25cm from the vertical blind pipes to avoid overlapping with the area where rejuvenation solution will be applied later. This staggered arrangement prevents components in the rejuvenation solution from potentially eroding the fertilizer stick coating, maintaining its integrity and preventing premature degradation. On the other hand, the staggered arrangement also avoids concentrated salt damage, preventing seedling burn.

[0013] In some embodiments, the rejuvenation solution comprises a rooting agent, a fungicide, and a microbial agent; the rooting agent can induce the differentiation of root meristems and promote root growth; the fungicide can inhibit soil-borne pathogens and provide a favorable environment for root growth; the microbial agent can form a mutually beneficial symbiotic relationship with the root system and expand the root absorption area.

[0014] In some preferred embodiments, the rooting agent is a 25,000-33,000 times diluted solution of Root-En-Shuai; the fungicide is a 500-700 times diluted solution of Bacillus subtilis; and the microbial agent is a 200-300 times diluted solution of arbuscular mycorrhizal fungi (AMF).

[0015] In some preferred embodiments, the different components of the rejuvenation solution should be applied in stages. On the 7th day after planting the slow-release fertilizer, 15-30L of a mixture of rooting agent and fungicide should be added; on the 14th day after planting the slow-release fertilizer, 15-30L of AMF (ammonia lysate) should be added separately. After Bacillus subtilis colonizes, the nitrogen source released by the fertilizer can be used to synthesize antibiotics, which can first eliminate pathogens and provide an ecological niche for AMF reproduction later. The addition of AMF avoids the competition period with Bacillus subtilis, preventing Bacillus subtilis from inhibiting spore germination. The rejuvenation solution and slow-release fertilizer are spatially staggered and time-separated in their application time and method, and can synergistically enhance each other, jointly providing a good growth environment for the roots of roadside trees and improving root absorption efficiency.

[0016] In some preferred embodiments, the microbial agent further includes 0.01% trehalose, which can protect spores and improve stress resistance.

[0017] In some embodiments, the connecting blind ditch a is a small ditch dug along the center line of adjacent roadside trees, with both ends of the ditch connected to the soil in the tree pit. The bottom of the ditch is leveled, and then lime salt is laid, followed by the blind pipe a, and then more lime salt is laid, so that the total thickness of the lime salt layer is maintained at 15-20cm. In the connecting blind ditch b, the bottom of the ditch is leveled, and then lime salt is laid, followed by the blind pipe b, and then more lime salt is laid, so that the total thickness of the lime salt layer is maintained at 15-20cm.

[0018] Furthermore, the specifications of the small ditch are 40cm wide and 60cm deep; both ends of the blind pipe a and the blind pipe b are wrapped with water-permeable non-woven fabric to prevent soil particles from entering the blind pipe; furthermore, the walls of the blind pipe a and the blind pipe b are provided with breathable micropores with a diameter of 2-5mm to increase air permeability.

[0019] In one specific embodiment, the diameter of the blind tube a and the blind tube b is 63mm, the tube body is a spiral corrugated tube, the tube wall is in the form of crests and troughs, there are breathable micropores at the troughs with a diameter of 2-5mm, and fine thread (such as wool or polyester thread) is spirally wound at the troughs to prevent impurities from clogging the micropores.

[0020] In some embodiments, blind tube a and blind tube b are connected by a tee. Furthermore, the blind pipe b in the connecting blind ditch b leading to the municipal drainage well should extend 20-30cm beyond the municipal drainage well.

[0021] The advantages and beneficial effects of this invention are as follows: The technical method of this invention can effectively restore the growth vigor of roadside trees. By setting up a three-dimensional aeration network in the tree pit with a vertical perlite blind pipe group and a horizontal limestone permeable layer, the root system's respiration and aeration are effectively guaranteed. By using slow-release stick fertilizer combined with microbial growth regulators, a synergistic effect is achieved through spatially staggered and time-separated application, targeting and activating the root system, ensuring a good soil environment for root growth. The combination of the permeable layer and the connecting blind drains can store some rainwater in the dry season, acting like a sponge, and can drain water in the rainy season, alleviating waterlogging. Finally, a three-in-one rejuvenation system of "three-dimensional aeration - targeted nutrient supply - vertical connectivity" is formed. Through processes such as drilling for oxygenation, root ecological reconstruction, dynamic nutrient regulation, and water storage and drainage, deep root aeration is guaranteed, and nutrient utilization efficiency is improved. At the same time, the combination of the horizontal drainage layer, vertical blind pipe group, and connecting blind drains achieves the effect of "storing water in drought and draining water in flood," which can greatly restore and improve the growth vigor of roadside trees. Attached Figure Description

[0022] Figure 1 This is a cross-sectional schematic diagram of the tree pit and connecting blind drain a structure; Figure 2A top-view schematic diagram of the tree pit and the connecting blind drains (including connecting blind drain a and connecting blind drain b); In the diagram, 1 is a roadside tree, 2 is a tree grate, 3 is a layer of nitrate, 4 is a layer of fine sand, 5 is a slow-release fertilizer stick, 6 is a vertical blind pipe, 7 is a connecting blind ditch a, 8 is blind pipe a, 9 is a connecting blind ditch b, 10 is blind pipe b, 11 is a municipal drainage well, 12 is nitrate, and 13 is a tee. Detailed Implementation

[0023] The embodiments of the present invention are described in detail below. These embodiments are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0024] Unless otherwise specified, the experimental methods used in the following examples are conventional methods.

[0025] Unless otherwise specified, the materials, reagents, and apparatus used in the following examples can be obtained commercially or prepared according to methods published in the literature.

[0026] In this document, when values ​​are described as ranges, it should be understood that such disclosure includes disclosure of all possible subranges within that range, as well as the specific numerical values ​​falling within that range, regardless of whether the specific numerical value or specific subrange is explicitly specified.

[0027] The following are descriptions of terms or words, and unless otherwise defined, all technical and scientific terms used herein have the meanings commonly understood by one of ordinary skill in the art to which this invention pertains.

[0028] In this article, the words “contain” and “include” and their various variations mean that other elements or wholes may be included but not specifically described.

[0029] All raw materials used in this invention are commercially available products. Among them: Bacillus subtilis: Huaneng ® Bacillus subtilis microbial agent, effective live bacteria count ≥2 billion / g, produced by Qingdao Hairuis Marine Biotechnology Co., Ltd., specification is 1kg / bag, powder.

[0030] Arbuscular mycorrhizal fungal inoculant: Produced by Beijing Jinbilai Biotechnology Co., Ltd., specification: 50g / bag, powder, effective strain name: Rhizocystis heterophylla, propagation number ≥70 cells / mL.

[0031] Bacillus megaterium inoculum: produced by Guangxi Nongbao Bioengineering Co., Ltd., in 500g / bag powder form, with a live bacteria count of 10 billion / g.

[0032] Slow-release fertilizer: Guoguang Shiqi compound fertilizer (N:P2O5:K2O=15:15:15).

[0033] Nitrogen, phosphorus and potassium compound fertilizer: Stanley compound fertilizer (N:P2O5:K2O=19:19:19).

[0034] Example 1

[0035] Treatment was administered to London plane trees with a diameter at breast height (DBH) of 15 cm that were growing poorly. The experiment was conducted in Huayuan Industrial Park, Xiqing District, Tianjin. The London plane trees were found to have reduced foliage, yellowish leaves, and some withered branches.

[0036] (1) Remove the original soil layer of 15cm thickness in the tree pit of the roadside trees; drill five vertical holes evenly in the tree pit with the trunk as the center, with a drilling depth of 1.2m and a drilling diameter of 10cm; install vertical blind pipes with a diameter of 63mm in the holes, with the upper end of the blind pipes 15cm above the soil surface in the tree pit and the lower end of the blind pipes reaching the bottom of the holes; fill the inside and outside of the blind pipes with perlite, and the pipe body of the vertical blind pipes is a spiral corrugated pipe with a corrugated wall in the form of corrugations and troughs, with 2mm diameter micropores at the troughs. Plant three slow-release fertilizer sticks at the inner and outer edges of the tree pit, with the distance between the fertilizer sticks and the blind pipes greater than 25cm; (2) First, lay a 5cm thick layer of fine sand on the soil surface in the tree pit, then lay a 10cm thick layer of saltpeter with a particle size of 0.8-1.5cm; then lay a tree grate on top of the saltpeter layer. (3) Using the line connecting adjacent roadside trees as the center line, the original sidewalk on the center line is removed; dig a small ditch along the center line of the adjacent roadside trees, with both ends of the ditch connected to the soil in the tree pit. The ditch is 40cm wide and 60cm deep (the distance from the bottom of the ditch to the ground surface); level the bottom of the ditch and lay a 5cm thick layer of nitrate at the bottom, with a particle size of 0.8-1.5cm; lay blind pipe a on the nitrate layer, and wrap both ends of blind pipe a with permeable non-woven fabric (the body of blind pipe a is a spiral corrugated pipe with a corrugated wall in the form of crests and troughs, and there are breathable micropores with a diameter of 2mm at the trough position); after laying blind pipe a, continue to lay nitrate to keep the total thickness of the nitrate layer 15cm, thus completing the connection of blind ditch a; (4) Along the connecting blind ditch a, every 30-50m, a connecting blind ditch b is set up. One end of the connecting blind ditch b is connected to the connecting blind ditch a, and the other end leads to the municipal drainage well. First, dig a small ditch with a width of 40cm and a depth of 60cm. Level the bottom of the small ditch and lay a 5cm thick layer of nitrate at the bottom. The particle size of the nitrate is 0.8-1.5cm. Lay the blind pipe b on the nitrate layer. Wrap both ends of the blind pipe b with water-permeable non-woven fabric (the pipe body of the blind pipe b is a spiral corrugated pipe with a corrugated peak and trough shape. There are breathable micropores with a diameter of 2mm at the trough position). After laying the blind pipe b, continue to lay nitrate to keep the total thickness of the nitrate layer 15cm. The connecting blind ditch b is then completed. (5) Backfill soil on the connecting blind drains a and b, and restore the surface sidewalk paving or green space; (6) Add rejuvenation solution to the vertical blind tube in the tree pit at different time periods. On the 7th day after planting the slow-release stick fertilizer, add 20L of a mixture of 28,000 times diluted Genenshuai and 500 times diluted Bacillus subtilis. (7) On the 14th day after implantation of slow-release stick fertilizer, add 20L of AMF bacterial agent diluted 200 times. The AMF bacterial agent contains 0.01% trehalose.

[0037] Comparative Example 1

[0038] The difference from Example 1 is that in Comparative Example 1, three vertically uniform holes were drilled in the tree pit, and two slow-release fertilizer sticks were implanted in the inner and outer edges of the tree pit.

[0039] Comparative Example 2

[0040] The difference from Example 1 is that in Comparative Example 2, three vertically uniform holes were drilled in the tree pit, and two slow-release fertilizer sticks were inserted into the inner and outer edges of the tree pit. Rejuvenating solution was added to the vertical blind tubes in the tree pit at different time intervals. On the 7th day after inserting the slow-release fertilizer sticks, 20L of a mixture of 20,000 times diluted Root Enshuai and 300 times diluted Bacillus subtilis was added. On the 14th day after inserting the slow-release fertilizer sticks, 20L of 100 times diluted AMF bacterial agent was added alone.

[0041] Comparative Example 3

[0042] The difference from Example 1 is that in Comparative Example 3, a rejuvenation solution was added to the vertical blind tube in the tree pit at the same time. On the 7th day after the slow-release stick fertilizer was planted, 20L of a mixture of Root Enshuai at a concentration of 28,000 times and Bacillus subtilis at a concentration of 500 times was added, along with 20L of AMF bacterial agent at a concentration of 200 times.

[0043] Comparative Example 4

[0044] The difference from Example 1 is that in Comparative Example 4, rejuvenation solution was added to the vertical blind tube in the tree pit at different time periods. On the 3rd day after the slow-release fertilizer was planted, 20L of a mixture of 28,000 times diluted Genenshuai and 500 times diluted Bacillus subtilis was added. On the 6th day after the slow-release fertilizer was planted, 20L of 200 times diluted AMF bacterial agent was added alone.

[0045] Comparative Example 5

[0046] The difference from Example 1 is that in Comparative Example 5, 20L of a mixture of 28,000 times diluted Genenshuai and 500 times diluted 50% carbendazim was added on the 7th day after the slow-release fertilizer was implanted, and 20L of 200 times diluted Bacillus megaterium inoculant was added separately on the 14th day after the slow-release fertilizer was implanted.

[0047] Comparative Example 6

[0048] The difference from Example 1 is that when setting up connecting blind drains a and b, a 3cm thick layer of nitrate is first laid at the bottom of the small drain, and then blind pipes are laid on the nitrate layer. After laying the blind pipes, nitrate is laid again to keep the total thickness of the nitrate layer 10cm.

[0049] Comparative Example 7

[0050] The difference from Example 1 is as follows: slow-release fertilizer sticks are not implanted; five vertical blind tubes are set up; a mixture of perlite and NPK compound fertilizer (the volume ratio of NPK compound fertilizer and perlite is 1:3) is filled inside the vertical blind tubes; perlite is filled outside the vertical blind tubes; rejuvenation solution is added to the vertical blind tubes in the tree pit at different time periods; on the 7th day after setting up the vertical blind tubes, 20L of a mixture of 28,000 times diluted Genenshuai and 500 times diluted Bacillus subtilis is added; on the 14th day after setting up the vertical blind tubes, 20L of 200 times diluted AMF bacterial agent is added alone.

[0051] Comparative Example 8

[0052] The difference from Example 1 is that slow-release fertilizer sticks, vertical blind pipes, and rejuvenation liquid are not set up. Instead, conventional soil improvement methods are used, that is, well-rotted cow manure and NPK compound fertilizer are evenly applied in the tree pit. The amount of well-rotted cow manure is 2 kg / m², and the amount of NPK compound fertilizer is 500 g / tree. Then, the cow manure, compound fertilizer and soil are mixed evenly with a shovel to a depth of 20 cm.

[0053] Results Analysis After processing different implementation examples and comparative examples, the growth of roadside trees was statistically analyzed after one year. The statistical results are shown in Table 1. The length of new shoots was measured directly (using a steel tape measure to measure the length of new branches), and the leaf area was measured using a leaf area meter. Five trees were randomly selected from each treatment, and five new branches were randomly selected from each tree for measurement and average value was taken.

[0054] Table 1. Statistics on the growth of roadside trees

[0055] As shown in Table 1, the average new shoot length of the London plane trees treated using the technical method of this invention reached 145.24 cm, and the average leaf area reached 829.47 cm². 2 Furthermore, based on the comparison between Comparative Examples 1-8 and Example 1, it can be seen that the number of vertical blind tube groups, the number of slow-release fertilizer sticks, the spatial position of the vertical blind tube groups and fertilizer sticks, as well as the selection, application amount, and application time of rooting agents, fungicides, and microbial agents can all have a significant impact on restoring and improving the growth vigor of roadside trees. Only under the conditions of the embodiments of the present invention can the growth vigor of roadside trees be greatly restored and improved.

[0056] A comparison of Example 1 and Comparative Example 1 shows that in Example 1, five vertical blind tubes were installed in the tree pit, and three slow-release fertilizer sticks were implanted along the inner and outer edges of the tree pit; in Comparative Example 1, three vertical blind tubes and two slow-release fertilizer sticks were installed. The average new shoot length and average leaf area of ​​Comparative Example 1 were 135.67 cm² and 546.81 cm², respectively. 2 Example 1 showed significantly better results than Comparative Example 1. It can be seen that only when the number of vertical blind tube groups and the number of slow-release fertilizer sticks reach a certain level can the perlite micropores provide sufficient air channels and mineral elements for the London plane tree roots, promote root growth, and significantly improve the growth potential of the London plane tree.

[0057] A comparison of Example 1 and Comparative Example 2 shows that in Example 1, five vertical blind pipes were installed in the tree pit, and three slow-release fertilizer sticks were planted along the inner and outer edges of the tree pit. The rejuvenation solution included a 28,000-fold dilution of Root Enshuai, a 500-fold dilution of Bacillus subtilis, and a 200-fold dilution of AMF inoculant. In Comparative Example 2, three vertical blind pipes and two slow-release fertilizer sticks were installed. The rejuvenation solution included a 20,000-fold dilution of Root Enshuai, a 300-fold dilution of Bacillus subtilis, and a 100-fold dilution of AMF inoculant. The average new shoot length and average leaf area of ​​Comparative Example 2 were 138.19 cm² and 651.21 cm², respectively. 2 Example 1 showed significantly better results than Comparative Example 2. It can be seen that when the number of vertical blind tube groups and slow-release stick fertilizers was insufficient, although the concentration of the rejuvenation solution was increased, it still could not significantly improve the growth vigor of the London plane tree. Due to insufficient aeration and fertilizer in the early stage, the root growth was weak. Although the concentration of the rejuvenation solution was increased in the later stage, the effect on promoting root growth was limited.

[0058] A comparison of Example 1 and Comparative Example 3 shows that in Example 1, rejuvenation solution was added to the vertical blind tubes in the tree pit at different time intervals. On the 7th day after planting the slow-release fertilizer, 20L of a mixture of 28,000x concentration of GenEnShuai and 500x concentration of Bacillus subtilis was added. On the 14th day after planting the slow-release fertilizer, 20L of 200x concentration of AMF inoculant was added alone. In Comparative Example 3, rejuvenation solution was added to the vertical blind tubes in the tree pit simultaneously. On the 7th day after planting the slow-release fertilizer, 20L of a mixture of 28,000x concentration of GenEnShuai, 500x concentration of Bacillus subtilis, and 20L of 200x concentration of AMF inoculant were added. The average new shoot length and average leaf area of ​​Comparative Example 3 were 130.38cm and 447.48cm, respectively. 2The effect of Example 1 was significantly better than that of Comparative Example 3, indicating that adding the rejuvenation solution at different time periods significantly promoted the growth of the London plane tree. In Example 1, the initial application of organic fertilizer activated the rhizosphere soil and indigenous microorganisms; after 7 days, Bacillus subtilis used the nitrogen source of the organic fertilizer to synthesize antibiotics, eliminating pathogens and providing an ecological niche for AMF; after 14 days, AMF avoided the competition period with Bacillus subtilis, inducing a large number of secondary roots to grow, which helped the new roots absorb nutrients from the organic fertilizer.

[0059] A comparison of Example 1 and Comparative Example 4 shows that in Example 1, rejuvenation solution was added to the vertical blind tubes in the tree pit at different time periods. On the 7th day after planting the slow-release fertilizer, 20L of a mixture of 28,000 times diluted GenEnShuai and 500 times diluted Bacillus subtilis was added. On the 14th day after planting the slow-release fertilizer, 20L of 200 times diluted AMF inoculant was added alone. In Comparative Example 4, rejuvenation solution was added to the vertical blind tubes in the tree pit at different time periods. On the 3rd day after planting the slow-release fertilizer, 20L of a mixture of 28,000 times diluted GenEnShuai and 500 times diluted Bacillus subtilis was added. On the 6th day after planting the slow-release fertilizer, 20L of 200 times diluted AMF inoculant was added. The average new shoot length and average leaf area of ​​Comparative Example 4 were 133.63 cm² and 523.88 cm², respectively. 2 Example 1 showed a significantly better effect than Comparative Example 4. It can be seen that the timing of adding different components of the rejuvenation solution has a significant impact on the rejuvenation effect. In Comparative Example 4, the rooting agent, fungicide, and microbial agent could not play a good synergistic role in the application of the rejuvenation solution, so the effect of promoting root growth was not significant.

[0060] A comparison of Example 1 and Comparative Example 5 shows that in Example 1, a rejuvenation solution was added to the vertical blind tubes in the tree pit at different time periods. On the 7th day after planting the slow-release fertilizer, 20L of a mixture of 28,000 times diluted Genenshuai and 500 times diluted Bacillus subtilis was added. On the 14th day after planting the slow-release fertilizer, 20L of 200 times diluted AMF inoculant was added alone. In Comparative Example 5, a rejuvenation solution was added to the vertical blind tubes in the tree pit at different time periods. On the 7th day after planting the slow-release fertilizer, 20L of a mixture of 28,000 times diluted Genenshuai and 500 times diluted 50% carbendazim was added. On the 14th day after planting the slow-release fertilizer, 20L of 200 times diluted Bacillus megaterium inoculant was added alone. The average new shoot length and average leaf area of ​​Comparative Example 5 were 131.85cm and 472.95cm, respectively. 2 Example 1 showed significantly better results than Comparative Example 5. The reason for this may be that the application of chemical bactericides in Comparative Example 5 may have killed beneficial microorganisms, which then had an antagonistic effect on the subsequently added Bacillus megaterium.

[0061] A comparison of Example 1 and Comparative Example 6 shows that in Example 1, when setting up connecting blind ditches a and b, a 5cm thick layer of nitrates was first laid at the bottom of the small ditch, followed by blind pipes. After laying the blind pipes, more nitrates were laid to maintain a total nitrate layer thickness of 15cm. In Comparative Example 6, when setting up connecting blind ditches a and b, a 3cm thick layer of nitrates was first laid at the bottom of the small ditch, followed by blind pipes. After laying the blind pipes, more nitrates were laid to maintain a total nitrate layer thickness of 10cm. The average new shoot length and average leaf area of ​​Comparative Example 6 reached 137.94cm² and 625.74cm², respectively. 2 Example 1 showed significantly better results than Comparative Example 6. The reason for this may be that the thickness of the nitrate layer in the connecting blind drains a and b in Comparative Example 6 was smaller, which would reduce the water conduction and drainage function of the connecting blind drains a and b, thereby reducing the root aeration and affecting root growth.

[0062] A comparison of Example 1 and Comparative Example 7 shows that in Example 1, five vertical blind tubes were installed in the tree pit, and three slow-release fertilizer sticks were implanted along the inner and outer edges of the tree pit. Rejuvenating solution was added to the vertical blind tubes at different time intervals. On the 7th day after implanting the slow-release fertilizer sticks, 20L of a mixture of 28,000 times diluted Root Enshuai and 500 times diluted Bacillus subtilis was added. On the 14th day after implanting the slow-release fertilizer sticks, 20L of 200 times diluted AMF bacterial agent was added alone. Comparative Example 7 did not implant slow-release fertilizer sticks; instead, the vertical blind tubes were filled with perlite and... A mixture of nitrogen, phosphorus, and potassium compound fertilizer (the volume ratio of compound fertilizer to perlite was 1:3) was used to fill the outside of vertical blind tubes. Rejuvenating solution was added to the vertical blind tubes in the tree pit at different time intervals. On the 7th day after setting up the vertical blind tubes, 20L of a mixture of 28,000 times diluted Root Enshuai and 500 times diluted Bacillus subtilis was added. On the 14th day after setting up the vertical blind tubes, 20L of 200 times diluted AMF inoculant was added alone. In Comparative Example 7, the average new shoot length and average leaf area reached 134.36cm and 549.34cm, respectively. 2 The effect of Example 1 was significantly better than that of Comparative Example 7. The reason may be that the effect of applying nitrogen, phosphorus and potassium compound fertilizer and rejuvenation liquid at the same site is worse than that of spatial staggered arrangement. Spatial staggered arrangement can allow AMF to avoid the bacterial dense area and establish symbiosis, while the rooting agent can efficiently induce root growth in the low nitrogen area, which is more conducive to the synergistic effect of different components.

[0063] A comparison of Example 1 and Comparative Example 8 shows that Example 1 of this application involved setting up five vertical blind pipes in the tree pit, planting three slow-release fertilizer sticks along the inner and outer edges of the tree pit, and adding a rejuvenation solution to the vertical blind pipes at different time intervals. On the 7th day after planting the slow-release fertilizer sticks, 20L of a mixture of 28,000 times diluted GenEnShuai and 500 times diluted Bacillus subtilis was added. On the 14th day after planting the slow-release fertilizer sticks, 20L of 200 times diluted AMF inoculant was added separately. Comparative Example 8 did not use slow-release fertilizer sticks, vertical blind pipes, or rejuvenation solution, but instead used a conventional soil improvement method, namely, uniformly applying well-rotted cow manure and NPK compound fertilizer in the tree pit. The amount of well-rotted cow manure was 2kg / m², and the amount of NPK compound fertilizer was 500g / tree. Then, the cow manure, compound fertilizer, and soil were mixed evenly with a shovel to a depth of 20cm. The average new shoot length and average leaf area of ​​Comparative Example 8 were 128.27cm² and 396.55cm², respectively. 2 Example 1 showed significantly better results than Comparative Example 8. It can be seen that conventional soil improvement methods cannot effectively improve the growth vigor of London plane trees. The combined effect of vertical blind tube groups, slow-release fertilizer sticks, and rejuvenation liquid in three-dimensional aeration and targeted nutrient supply can better promote the root growth of London plane trees and thus improve their growth vigor.

[0064] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0065] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A method for rejuvenating poor growth of street trees in hardened surface environments, characterized in that, Includes the following steps: (1) Remove the original soil layer of 15-20cm in the tree pit of the roadside trees; drill 4-8 vertical holes evenly in the tree pit with the trunk as the center; install vertical blind pipes in the holes; and plant 2-6 slow-release fertilizer sticks evenly in the tree pit with the trunk as the center. (2) Lay a 15-20cm thick permeable layer on the soil surface in the tree pit. The permeable layer includes a fine sand layer above the soil surface and a saltpeter layer above the fine sand layer. (3) Using the line connecting adjacent roadside trees as the center line, remove the original sidewalk paving on the center line; set up connecting blind drains a between adjacent roadside trees, and lay blind pipes a in the connecting blind drains; along the connecting blind drains a, set up connecting blind drains b every 30-50m, with one end of the connecting blind drains b connected to the connecting blind drains a and the other end leading to the municipal drainage well, backfill the soil, lay blind pipes b in the connecting blind drains b, and restore the surface sidewalk paving or green space; (4) Add rejuvenation solution to the vertical blind tubes in the tree pit.

2. The method for rejuvenating poor growth of roadside trees in hardened surface environments according to claim 1, characterized in that, When drilling holes in the tree pit, the drilling depth is 1.2-1.5m and the hole diameter is 10cm; the vertical blind pipe is 63mm in diameter, the upper end of the vertical blind pipe is 15-20cm above the soil surface in the tree pit, and the lower end of the vertical blind pipe reaches the bottom of the hole.

3. The method for rejuvenating poor growth of roadside trees in hardened surface environments according to claim 1, characterized in that, The vertical blind pipe is filled with perlite inside and out. In the permeable layer, the fine sand layer is 5-8cm long, the saltpeter layer is 10-12cm long, the saltpeter particle size is 0.8-1.5cm, and tree grates are laid on the saltpeter layer.

4. The method for rejuvenating poor growth of roadside trees in hardened surface environments according to claim 1, characterized in that, The slow-release bar fertilizer has a diameter of 3cm, a length of 13cm, and a composition of N:P2O5:K2O=15:15:15; Furthermore, the slow-release fertilizer sticks are implanted in 2-6 sticks according to the diameter at breast height (DBH) of the roadside trees. The amount of fertilizer is adjusted according to the DBH of the trees. For trees with a DBH of about 10cm, 2 sticks are implanted. For every 10cm increase in DBH, 1-2 more sticks are added. When applying the fertilizer, holes are first drilled within the root system of the tree. The holes are 40-60cm deep and 4cm in diameter. The slow-release fertilizer sticks are then injected into the holes and covered with soil.

5. The method for rejuvenating poor growth of roadside trees in hardened surface environments according to claim 1, characterized in that, The slow-release fertilizer sticks are planted on the outer edge of the tree pit, and the distance between the slow-release fertilizer sticks and the vertical blind pipes should be greater than or equal to 25cm.

6. The method for rejuvenating poor growth of roadside trees in hardened surface environments according to claim 1, characterized in that, The rejuvenation solution contains rooting agents, fungicides, and microbial agents; Preferably, the rooting agent is a 25,000-33,000 times diluted solution of Root Enshua; the fungicide is a 500-700 times diluted solution of Bacillus subtilis; and the microbial agent is a 200-300 times diluted solution of arbuscular mycorrhizal fungi.

7. A method for rejuvenating poor growth of roadside trees in hardened surface environments according to claim 6, characterized in that, The different components of the rejuvenation solution should be applied in stages. On the 7th day after planting the slow-release fertilizer, add 15-30L of the rooting agent and fungicide mixture; on the 14th day after planting the slow-release fertilizer, add 15-30L of AMF fungicide alone.

8. A method for rejuvenating poor growth of roadside trees in hardened surface environments according to claim 6, characterized in that, The microbial agent also includes 0.01% trehalose.

9. A method for rejuvenating poor growth of roadside trees in hardened surface environments according to claim 1, characterized in that, The connecting blind ditch a is a small ditch dug along the center line of adjacent roadside trees, with both ends of the ditch connected to the soil in the tree pit. The bottom of the ditch is leveled, and then lime salt is laid, followed by blind pipe a, and then more lime salt is laid, so that the total thickness of the lime salt layer is maintained at 15-20cm. In the connecting blind ditch b, the bottom of the ditch is leveled, and then lime salt is laid, followed by blind pipe b, and then more lime salt is laid, so that the total thickness of the lime salt layer is maintained at 15-20cm.

10. A method for rejuvenating poor growth of roadside trees in hardened surface environments according to claim 9, characterized in that, The specifications of the small trench are 40cm wide and 60cm deep; both ends of the blind tube a and the blind tube b are wrapped with water-permeable non-woven fabric; the walls of the blind tube a and the blind tube b are opened with air-permeable micropores with a diameter of 2-5mm; Furthermore, the blind pipe b in the connecting blind ditch b leading to the municipal drainage well should extend 20-30cm beyond the municipal drainage well.

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