CN111944531A - Modifier for physical properties of green soil and using method thereof - Google Patents

Abstract

The invention relates to a soil conditioner, in particular to a physical property conditioner of green soil and a using method thereof, which mainly comprises the following components: organic waste compost, wood biochar, rice hull ash, coconut coir, attapulgite powder and a microbial agent, wherein the volume percentage is as follows: composting organic wastes: wood charcoal: rice husk charcoal: coconut husk: 40-55% of attapulgite powder, 2-4% of attapulgite powder and 0.5-1% of attapulgite powder; the invention scientifically prepares the modifier for the physical properties of the green land soil by utilizing materials such as organic waste resource products, organic and inorganic materials, microbial agents and the like according to a certain proportion, and combines the microbial agents aiming at green land habitats of different types such as lawns, arbor and shrub planting holes, road greenbelts and the like, thereby effectively improving the degradation problems of the physical properties of the soil such as the volume weight, the air permeability, the infiltration rate, the aggregate structure, the non-capillary porosity and the like of the green land soil, playing a good long-term promotion role on the growth of green land plants and promoting the sustainability of the ecological functions of the green land.

Description

Modifier for physical properties of green soil and using method thereof

Technical Field

The invention relates to a soil conditioner, in particular to a physical property conditioner for green soil and a using method thereof.

Background

The green soil provides growing and developing environment for the underground parts of garden plants, supplies water, air, nutrient substances and the like required by the plants, is one of important components of an urban ecological system, is also a storage and purifier for urban pollutants, and one of the preconditions for maintaining a good soil ecological system is a good soil physical structure. The physical structure of soil is the foundation of soil fertility, and influences the number of elements of soil fertility and the coordination condition thereof, and simultaneously influences the physical, chemical and biological characteristics of soil. The change of the physical properties of the green land soil is greatly influenced by human activities, the green land soil has disordered structure and large spatial difference, the problems of physical properties such as large external pollutants such as construction waste, large compactness, poor air permeability and the like seriously influence the normal growth of garden plants, even cause the death of garden greening seedlings and cause greater and greater economic loss.

Even though planting soil is emphasized in traditional landscaping in China, soil fertility or pollution conditions are basically paid more attention, but physical properties of soil are not emphasized enough, the influence of the physical properties of soil on growth of landscape plants is not lower than that of other soil properties, and sometimes the soil physical properties are even the most key factors determining plant growth, such as physical indexes of soil volume weight, infiltration capacity, aggregates, non-capillary porosity and the like. In recent years, the urban green land soil remediation and improvement is becoming a research hotspot in the garden greening industry, and many reports are provided about the research on the green land soil improvement, the adopted modes and materials are various, most of the researches focus on the aspects of soil nutrient improvement, pH value improvement and the like, the research on the improvement technology related to the urban green land soil physical property is less, and related researches are limited to the aspects of physical property improvement material screening and improvement effect prediction and the like, for example, Qinling et al (reference documents: Qinling, Weijinping, Lijiarui, and the like, the influence of turf on the water retention property of sandy soil [ J ]. agricultural engineering reports, 2005,10:51-54.) consider that turf can effectively improve the soil structure, reduce the soil volume weight, improve the soil pore distribution and improve the soil water retention capacity. Zhang Xueshuang (reference: Zhang Xueshuang. research on the effect of different modifying agents on aeolian sandy soil [ D ]. Yinchuan, Ningxia university, 2008.) researches show that the straws and organic fertilizers can increase the content of organic matters and humus in sandy soil, increase the porosity of the soil and the water holding capacity in the field, and improve the ventilation and moisture conditions of the soil. The garden greening waste compost product has important effects on improving the soil fertility of urban soil, improving the soil structure, increasing the soil moisture accumulation, reducing the soil invasion, surface runoff and the like, and the woodenly et al (the reference documents: woodenly, Lisu shou, Yantian and the like) have important effects on improving the soil physical properties of the typical urban green land [ J ] soil, 2014,46(4): bush 709 ] by using different proportions of improved materials.

The soil source of the green land is complex, the soil body level is disordered, the landscaping effect is greatly influenced, meanwhile, the method is not beneficial to the sustainable development of urban gardens, and garden workers carry out a plurality of theoretical researches and practical applications in the aspect of improving the soil fertility of greenbelts, but the physical property of the soil is not paid enough attention, the physical property of the soil has no lower influence on the growth of landscape plants than the chemical property of other soil, sometimes even the most key factors determining the growth of the plants, such as soil volume weight, infiltration capacity, aggregate, non-capillary porosity and other physical indexes, related research is only limited in the aspects of screening of physical property improving materials and verifying the improving effect, and the research on the plant growth by the soil physical property improver, the exploration of the application method of the soil physical property improver under different green space habitat conditions and the evaluation research on the application effect of the soil physical property improver are less carried out.

Disclosure of Invention

In order to solve the problems, the invention aims to disclose a soil conditioner, in particular to a physical property conditioner of green soil and a using method thereof.

In order to achieve the purpose, the invention adopts the technical scheme that:

the modifier for the physical properties of the green land soil is characterized by mainly comprising the following components: organic waste compost, wood biochar, rice hull ash, coconut coir, attapulgite powder and a microbial agent.

Preferably, the modifier comprises the following components in percentage by volume: composting organic wastes: wood charcoal: rice husk charcoal: coconut husk: the attapulgite powder comprises 40-55% of attapulgite, 2-4% of attapulgite, and 0.5-1% of attapulgite.

Preferably, the volume percentage of the microbial agent in the components of the modifying agent is 0.5%, and the modifying agent is diluted to 400-500 times when in use.

Preferably, the organic waste compost is compost obtained after high-temperature fermentation compost is decomposed and sieved; the pH value is 7.0-8.0, the EC value is more than or equal to 2.0mS/cm, and the volume weight is 0.45-0.65 g/cm³The grain diameter is less than or equal to 35 mm.

Preferably, the wood charcoal is a residual carbon-rich solid byproduct generated after wood or branches are pyrolyzed in an anaerobic or hypoxic state, and the particle size is 1.5-5 mm.

Preferably, the rice husk carbon is a high-temperature carbonized product of rice husks, the pH value is 8-10, and the particle size is 0.5-1.5 mm.

Preferably, the coconut coir is a processed coconut byproduct or waste coconut husk fiber powder, the pH value is 5.5-7.0, the EC value is less than or equal to 0.5mS/cm, and the particle size is 0.5-6 mm.

Preferably, the attapulgite powder is prepared by grinding water-containing magnesium-rich aluminosilicate clay minerals with chain lamellar structures and sieving the ground materials with a 80-mesh sieve, wherein the particle size is less than or equal to 0.18 mm.

Preferably, the microbial agent is prepared by compounding various biocontrol bacteria such as bacillus, serratia and the like, and the pH value is 6.5-8.0.

The application method of the physical property improver for the green land soil is characterized by comprising the following steps:

step 1, ploughing original soil of a soil layer according to a specified depth;

step 2, applying the physical property improver of the soil with the same volume as the original soil in the ploughing process and fully mixing;

and 3, wetting by spraying water, and then uniformly spraying the microbial agent with the volume percentage of 0.5 percent diluted by 500 times to an improved area.

The invention has the beneficial effects that: the invention scientifically prepares the physical property modifying agent of the green land soil by utilizing materials such as organic waste resource products, organic and inorganic materials, microbial agents and the like according to a certain proportion, applies the physical property modifying agent of the soil by adopting different construction methods aiming at different types of green land habitats such as lawns, arbor and shrub planting holes, road green belts and the like in combination with the microbial agents, thereby effectively improving the degradation problems of the physical properties of the soil such as the volume weight, the air permeability, the infiltration rate, the aggregate structure, the non-capillary porosity and the like of the green land soil, playing a good long-acting promoting role on the growth of green land plants and promoting the sustainability of the ecological function of the green land.

The raw materials are convenient to obtain, are organic waste resource products and natural minerals rich in storage, are combined with the microbial agent for fermentation and propagation, are environment-friendly, have positive effects on promoting energy conservation and emission reduction of urban green lands and improving ecological functions of green land soil, and have good social, economic and environmental benefits. Meanwhile, the invention has good improvement effect on the physical properties and comprehensive fertility of soil in the planting areas of herbaceous, shrub and ancient trees (big trees), and can also adjust and promote the growth of plant roots. In addition, under different types of green land planting environments, different engineering construction methods are formulated to apply the soil physical property modifying agent, and the soil physical property modifying agent is more targeted to the soil physical property modification of different types of planting habitats of green land plants. After the soil physical property modifier is applied, the vegetation growth and the soil are subjected to long-term in-situ monitoring, and the application effect of the soil physical property modifier is evaluated.

Drawings

Fig. 1 is a schematic view of an operation of collecting soil of a lawn according to a first embodiment of the present invention.

FIG. 2 is a schematic diagram of the operation of preparing the soil physical property improver according to the first embodiment of the present invention.

FIG. 3 is a schematic view showing the operation of diluting the microbial inoculum 500 times in the first embodiment of the present invention.

FIG. 4 is a schematic diagram of the operation of applying the modifying agent according to the first embodiment of the present invention.

FIG. 5 is a schematic view of a modified area plowing or digging a ditch shaped like a Chinese character 'jing' according to a second embodiment of the present invention.

FIG. 6 is a schematic view showing the operation of preparing a soil physical property improver according to the second embodiment of the present invention.

FIG. 7 is a schematic view of the operation of the spreading modifier of the second embodiment of the present invention.

FIG. 8 is a schematic diagram of the operation of the sprinkling and pouring microbial inoculum in the second embodiment of the invention.

Fig. 9 is a schematic view of soil collection operation of a large tree land according to a third embodiment of the present invention.

FIG. 10 is a schematic view of the third embodiment of the present invention for digging improved trench and digging hole.

FIG. 11 is a schematic illustration showing the operation of mixing the physical property improver for soil and the original soil in equal volume in the third embodiment of the present invention.

FIG. 12 is a schematic view of the operation of pouring the microbial inoculum in the third embodiment of the invention.

FIG. 13 is a data graph of root biomass and rhizomes of kawo after the improvement of the third site according to the present invention.

Fig. 14 is a schematic view of the soil collection and investigation operation of the ancient tree stand according to the fourth embodiment of the present invention.

Fig. 15 is a schematic view of a drilling operation according to a fourth embodiment of the present invention.

FIG. 16 is a schematic view showing the operation of applying a soil physical property improver and applying a microbial agent to a deep root in example four of the present invention.

Fig. 17 is a schematic view showing a mixing operation of the soil and the soil physical property improver in the plowed open field according to the fourth embodiment of the present invention.

FIG. 18 is a diagram of the growth before root promotion according to the present invention.

FIG. 19 is a graph showing the beginning of defoliation at day 130 after rooting according to the present invention.

FIG. 20 is a graph showing the recovery of growth after rooting by day 200 according to the present invention.

FIG. 21 is a horizontal distribution diagram of the ancient hackberry tree root system before root promotion.

FIG. 22 is a vertical distribution diagram of the root system of the hackberry before the root promotion.

FIG. 23 is a three-dimensional view of the root distribution of ancient hackberry trees at 130 days after rooting promotion.

FIG. 24 is a comparison graph of root density of ancient hackberry trees with different distribution depths at 130 days after rooting promotion.

FIG. 25 is a comparison graph of root density of ancient hackberry trees with different distribution depths at 600 days after rooting promotion.

FIG. 26 is a data diagram of the variation of the comprehensive fertility of soil after the improvement agent with different formulations is added to the original soil.

Detailed Description

The following detailed description of embodiments of the invention refers to the accompanying drawings:

the method needs to investigate the current situation of green vegetation and soil on site, collect green soil and a cutting ring, and detect physical property indexes such as green soil volume weight, air permeability, infiltration rate, aggregate structure, non-capillary porosity and the like in a laboratory; and then evaluating the physical property quality of the green land soil according to the standard of the green planting soil and an improved inner Metro comprehensive index evaluation method, and obtaining a formula of the soil physical property improver in infinite tests according to the current situation of the green land soil quality:

a physical property improver for green land soil, which mainly comprises the following components: organic waste compost, wood biochar, rice hull ash, coconut coir, attapulgite powder and a microbial agent; the modifier comprises the following components in percentage by volume: composting organic wastes: wood charcoal: rice husk charcoal: coconut husk: 40-55% of attapulgite powder, 2-4% of attapulgite powder and 0.5-1% of attapulgite powder; the volume percentage of the microbial agent serving as the component of the modifying agent is 0.5%, and the modifying agent is diluted to 400-500 times when in use; putting the organic waste compost, the wood biochar, the rice hull carbon, the coconut husk and the attapulgite powder into a stirrer according to the volume percentage, fully stirring and mixing to obtain a solid improving material mixed product, and applying the solid improving material to the green soil and then adding the solid improving material into the green soil0.5% by volume of microbial inoculum is diluted 500-fold and evenly drenched or deep rooted and applied to the modified area. Further, the organic waste compost is compost obtained after high-temperature fermentation compost is decomposed and sieved; the pH value is 7.0-8.0, the EC value is more than or equal to 2.0mS/cm, and the volume weight is 0.45-0.65 g/cm³The grain diameter is less than or equal to 35 mm; the wood charcoal is a residual carbon-rich solid byproduct generated after wood or branches are pyrolyzed in an anaerobic or hypoxic state, and the particle size is 1.5-5 mm; the rice hull carbon is a high-temperature carbonized product of rice hulls, the pH value is 8-10, and the particle size is 0.5-1.5 mm; the coconut coir is a processed coconut byproduct or waste coconut husk fiber powder, the pH value is 5.5-7.0, the EC value is less than or equal to 0.5mS/cm, and the particle size is 0.5-6 mm; the attapulgite powder is prepared by grinding water-containing magnesium-rich aluminosilicate clay minerals with chain lamellar structures and sieving the ground materials with a 80-mesh sieve, wherein the particle size is less than or equal to 0.18 mm; the microbial agent is prepared by compounding various biocontrol bacteria such as bacillus, serratia and the like, and the pH value is 6.5-8.0.

A use method of a physical property improver for green land soil comprises the following steps:

step 1, ploughing original soil of a soil layer according to a specified depth;

step 2, applying the physical property improver of the soil with the same volume as the original soil in the ploughing process and fully mixing;

and 3, wetting by spraying water, and then uniformly spraying the microbial agent with the volume percentage of 0.5 percent diluted by 500 times to an improved area.

However, for different fields and different types of planting habitats of plants in green land, the soil physical property modifying agent is applied by different construction methods, namely the specific use methods are different:

the application method of the green land soil physical property modifier for the lawn environment comprises the following steps:

s1, turning original soil of a soil layer with the depth of 0-30 cm aiming at the problem of soil physical property degradation before lawn planting, applying a soil physical property modifier with the same volume as the original soil in the turning process, fully mixing, wetting by water, and diluting a microbial agent with the volume percentage of 0.5% by 500 times and uniformly pouring the microbial agent to an improved area; s2, trimming the lawn in the improved area aiming at the problem of soil physical property degradation of the green land planted with the lawn, uniformly spreading the soil physical property modifier to the improved area with the thickness of about 1-3 cm, fully spraying water to wet, and uniformly spraying 500 times of microbial agent with the volume percentage of 0.5% to the improved area.

Secondly, aiming at the shrub planting area, the use method of the physical property modifier of the green land soil is as follows:

s1, aiming at the problem of soil physical property degradation of the green land on which shrubs are not planted, the application method of the soil physical property modifier is the same as that of the lawn S1; s2, aiming at the problems of soil physical property degradation and poor construction conditions of planted shrub greenbelts, a 20 cm-wide 30-50 cm-deep well-shaped improvement ditch can be dug manually or mechanically, a soil physical property modifier equal in volume to the original soil is applied to the improvement ditch, a layer of original soil is covered on the surface layer, and after the improvement ditch is fully drenched with water and wetted, 0.5% of microbial agent in volume percentage is diluted by 500 times and evenly drenched to an improvement area.

Thirdly, aiming at the planting hole of the ancient tree (big tree), the use method of the physical property improver of the green land soil is as follows:

s1, aiming at the problem of degradation of physical properties of soil in planting holes of ancient trees (big trees) under better construction conditions, mechanically stripping original soil of a 50cm soil layer, carefully avoiding underground root systems in the cleaning process, avoiding the root systems from being damaged, fully mixing the stripped original soil and the soil according to the volume ratio of improved physical properties of 1:1, backfilling the mixture into the original tree holes, and uniformly pouring the mixture into the tree holes by diluting 500 times of a microbial agent with the volume percentage of 0.5% after fully drenching the mixture with water; s2, aiming at the problem of soil physical property degradation of planting holes of ancient trees (big trees) under poor construction conditions, drilling 6-8 round holes with the diameter of 20cm and the depth of 60cm respectively in the range of 0.5-0.8 m and 1.5-2 m away from a trunk by using a drilling machine, filling the soil physical property modifier into the round holes, fully spraying water to wet, and diluting microbial agents with the volume percentage of 0.5% by 500 times for uniform spraying or deep root application to the range of the tree holes;

observing and recording the vegetation growth vigor and root growth conditions of the improved area every 2 months, collecting the vegetation and the roots, and detecting the nutrient content and the activity of the roots in a laboratory; and (3) collecting soil in the improved area according to the method in the step 1, evaluating the soil quality according to the method in the step 3, and periodically monitoring the improvement effect of the physical properties of the soil in the green land.

When the method is specifically implemented, the process is as follows:

example one, a method for applying a lawn green soil physical property modifier:

1. selecting a lawn improvement area, collecting soil and a cutting ring in the area, detecting physical indexes such as soil volume weight, air permeability, infiltration rate, aggregate structure, non-capillary porosity and the like, and observing and recording the growth vigor of the lawn before improvement;

2. according to the soil quality evaluation result of the lawn improvement area, preparing organic wastes, wood biochar, rice hull carbon, coconut coir, attapulgite powder and other materials into a soil physical property modifier according to a certain proportion, and applying the soil physical property modifier in a mode of mixing with the original soil in an equal volume or spreading;

3. after fully drenching and wetting, diluting the microbial inoculum with the volume percentage of 0.5 percent by 500 times and evenly drenching the mixture to an improved area;

4. and observing and recording the growth vigor of the lawn in the improved area every 2 months, collecting soil layer soil and cutting rings of 0-30 cm in the improved area, detecting physical indexes such as soil volume weight, air permeability, infiltration rate, aggregate structure and non-capillary porosity, monitoring the dynamic change of the physical properties of the green soil in the improved area, and evaluating the application effect of the soil physical property improver.

As shown in fig. 1-4, the soil improvement is performed according to the steps, and as summarized in table 1 below, after the physical property improving agent is applied to the soil in the three lawn planting areas, the pH of the soil is reduced by 9.0%, the EC value, the organic matter content, the total nitrogen content, the total phosphorus content, the total potassium content and the air permeability are respectively improved by 25.0%, 42.1%, 200.0%, 50.0%, 200.0% and 127.7%, which indicates that the soil quality is remarkably improved after the improving agent is applied to the lawn planting areas.

TABLE 1 physicochemical property changes of soil before and after improvement in lawn planting area in Zhujiang park

Example two, a method for improving and applying physical properties of soil in a shrub planting area:

1. selecting a shrub planting area improvement area, collecting soil and a cutting ring in the area, and detecting physical indexes such as soil volume weight, air permeability, infiltration rate, aggregate structure, non-capillary porosity and the like;

2. according to the soil quality evaluation result of a shrub planting improvement area, preparing organic wastes, wood biochar, rice hull charcoal, coconut chaff, attapulgite powder and other materials into a soil physical property improver according to a certain proportion, and applying the soil physical property improver by adopting a mode of mixing with the original soil in the same volume or broadcasting or digging a 'well' -shaped improvement ditch;

3. after fully drenching and wetting, diluting the microbial inoculum with 0.5 percent of volume percentage by 500 times and evenly drenching the improved area;

4. observing and recording the growth vigor of shrubs in the improved area every 2 months, collecting soil and cutting rings in the shrub planting improved area, detecting physical indexes such as soil volume weight, air permeability, infiltration rate, aggregate structure and non-capillary porosity, monitoring the dynamic change of the physical properties of the soil in the improved area, and evaluating the application effect of the soil physical property improver.

As shown in fig. 5-8, the soil is improved according to the steps, and as shown in table 2 below, after the physical property improving agent is applied to the soil in the cap mountain camellia garden planting area, the pH of the soil is increased by 26.0%, and the EC value, the organic matter content, the total nitrogen content, the total phosphorus content, the total potassium content and the air permeability are respectively increased by 300%, 106.8%, 215.0%, 147.4%, 274.9% and 66.6%, which indicates that the soil quality is significantly improved after the improving agent is applied to the shrub planting area.

TABLE 2 physicochemical property changes of soil before and after soil improvement in Sheau mountain shrub planting areas

Example three, an application method for improving the physical properties of soil planted in ancient trees (big trees):

1. selecting a tree pit improvement area of an ancient tree (a big tree), collecting soil and a cutting ring in the improvement area, and detecting physical indexes such as soil volume weight, air permeability, infiltration rate, aggregate structure, non-capillary porosity and the like;

2. according to the evaluation result of the soil quality of the pit, organic waste, wood biochar, rice hull carbon, coconut coir, attapulgite powder and the like are prepared into a soil physical property modifier according to a certain proportion, and the soil physical property modifier is applied in a mode of mixing with the original soil in the same volume or drilling;

3. after fully drenching and wetting, diluting the microbial inoculum with 0.5 percent of volume percentage by 500 times, and uniformly drenching or deep-rooting the microbial inoculum to an improved area;

4. observing and recording the growth vigor and root growth conditions of ancient trees (big trees) in the improved area every 2 months, collecting soil layer soil of 0-110 cm and soil layer cutting rings of 0-30 cm in the improved area, collecting the vegetation and the roots, detecting the nutrient content and the root activity of the vegetation, detecting physical indexes such as soil volume weight, air permeability, infiltration rate, aggregate structure, non-capillary porosity and the like, monitoring the dynamic change of the physical properties of the green soil in the improved area, and evaluating the application effect of the soil physical property improver, wherein the implementation process is shown in figures 9-12.

Selecting 1 part of planting hole mixed soil sample at the end of 3 months and 5 months (after improvement) of the same year, respectively collecting 1 part of planting hole mixed soil sample, detecting and analyzing pH, EC, organic matters, total phosphorus, total nitrogen, total potassium and air permeability in a laboratory, referring to garden planting soil of Guangzhou city local standard according to a detection result, and evaluating the quality of the planting soil of the cotton tree hole of the Meiliyidong tree by using a single-factor evaluation method, wherein as shown in Table 3, the air permeability of the improved tree hole soil is enhanced by 121.7%, the contents of salt and organic matters are respectively increased by 153.8% and 27.9%, and the contents of nitrogen, phosphorus and potassium in the soil are also improved in different degrees.

TABLE 3 physicochemical Properties of beautiful kapok planting soil before and after vertical improvement

And (3) detecting and analyzing indexes such as root biomass, quantity and the like in each kilogram of soil after the vertical soil improvement of the isobavalia sinensis by using a statistical method. The result shows that the root biomass of each kilogram of soil layers of 0-30 cm and 30-60 cm after improvement is respectively increased by 43.48% and 43.90%, and the number of roots is respectively increased by 32.10% and 12.53% (as shown in figure 13); the method shows that the air permeability and nutrient condition of the soil are improved to a great extent by a series of improvement measures, thereby effectively promoting the growth of the surface soil root system.

Example four, a weak ancient woodland soil physical property improvement measure:

1. scanning the root system in the projection of the crown of the selected hackberry ancient tree with the serial number of 01060258 by using a root system scanning device type TRU tree radar scanner;

2. collecting original soil of ancient hackberry, and detecting physical and chemical indexes of soil including pH value, conductivity, organic matter content, hydrolyzable nitrogen content, available phosphorus content, available potassium content, air permeability and volume weight;

3. according to the growth characteristics of the ancient hackberry tree, organic waste, wood biochar, rice hull carbon, coconut coir, attapulgite powder and other materials are prepared into a soil physical property modifier according to a certain proportion;

4. hardening and paving sealed cement outside the ancient hackberry tree pit, crushing and excavating the ground by using an excavator to pave with the thickness of 15cm, and clearing pavement waste materials; cleaning soil paved by hardening the ancient hackberry tree, wherein the cleaning depth is 60cm, underground root systems are carefully avoided in the cleaning process, and the root systems are prevented from being damaged;

5. diluting the special bactericide by 800 times, fully sterilizing and disinfecting the old hackberry root system, uniformly spreading the modifying agent, backfilling to a depth of 60cm, properly tamping, fully spraying water for wetting, and uniformly spraying or deeply applying the microbial agent diluted by 500 times by 0.5 volume percent to a modified area;

6. re-paving the ancient hackberry tree on the ground for paving, and building a stand column support on the lower layer by using lime-sand bricks, cement and sand, wherein the paving is completed before the step 7; laying marble floor tiles with 9 air holes (the aperture is 5cm) on the upper layer, fully sealing the holes of the tiles by cement, and finishing after the step 5;

7. after the root system rooting field work is finished at 130 days, a TRU tree radar scanner is used for tracking the root system to restore the growth condition and evaluating the improvement effect, and the implementation process is shown in figures 14-17.

Analysis of results

1. Changes in growth of ancient trees

Before root system promotion, the ancient hackberry tree has poor growth vigor, sparse branches and leaves, yellowing of local leaves, the SPAD value of the leaves is 36.4, and the contents of total nitrogen, total phosphorus and total potassium are respectively 19.07g/kg, 0.97g/kg and 4.86 g/kg; the basic physicochemical properties of the cement hardened pavement bottom soil are as follows: the pH value is 8.15 (alkaline), the EC value is 0.12mS/cm, the organic matter content is 20.50g/kg, and the contents of the hydrolyzable nitrogen, the available phosphorus and the quick-acting potassium are 51.44mg/kg, 53.77mg/kg and 97.03mg/kg respectively. At 130 days after root promotion, the ancient hackberry tree begins to enter the deciduous period, and branches and leaves recover to grow well after 200 days, as shown in FIGS. 18-20; the contents of full N, full P and full K are respectively 28.13 g.kg-1, 4.34 g.kg-1 and 21.70 g.kg-1 on the 600 th day, and the content is obviously increased. Therefore, the soil physical property modifier can improve the root growth of the ancient hackberry trees and promote the accumulation of nitrogen, phosphorus and potassium nutrients in leaves.

2. Root distribution of ancient trees

(1) Root system distribution condition before habitat transformation: the scanning result of the TRU tree radar scanner shows that the root system of the ancient hackberry tree is mainly distributed in the projection coverage range of the crown, the root system is less, the maximum distance of the horizontal distribution of the root system to the tree head is about 5.8m, the vertical distribution depth is only 0-20 cm (figures 21 and 22), and the result is consistent with the result of the actual growth condition of the root system observed by digging on site;

(2) root system distribution condition after habitat transformation: after the habitat improvement day 130, the number of root systems of the ancient hackberry tree is obviously increased, the growing area is enlarged, a plurality of root systems are horizontally distributed, the farthest distance from the tree head is close to 5m, and the maximum conversion horizontal extension rate is estimated to be 3.8 cm/d; the vertical distribution depth is 0-50 cm, wherein the distribution density of root systems is the largest within the depth of 20-40 cm, the depth is 0-20 cm, and the number of root systems with the depth below 40cm is very small (fig. 23 and 24); in addition, the number of roots increased significantly from 107 on day 1 to 1914 on day 600 (see fig. 25).

3. Conclusion

The physical property of the soil conditioner is applied to the ancient hackberry tree, the recovery growth of the tree root system is obviously accelerated after 600 days, the root system quantity is increased, the growth area is enlarged, and the root system density is obviously increased from 2.48 pieces/m at 1 day to 72.27 pieces/m at 600 days.

Example five, the composition of the soil physical property improver of the invention was verified:

as can be seen from the following table 4, the results of comparing the physicochemical properties of the soil physical property improver of the formula 1 with those of the other 5 groups of formula soil physical property improvers show that each index of the formula 1 can basically reach the first-grade planting soil standard of 'garden planting soil' (DB4401T36-2019) of Guangzhou city landmarks, the pH, EC, organic matter content and total nitrogen phosphorus potassium content are all remarkably superior to those of the other 5 groups of formula (P <0.05), the volume weight is remarkably smaller than that of the other 5 groups of formula (P <0.05), and the comprehensive fertility is also remarkably higher than that of the other 5 groups of formula (P < 0.05).

TABLE 4 comparative analysis of physical and chemical properties of physical property modifiers for different formulations

Note: the improved inner Meiro (Nemoro) formula calculates the comprehensive fertility coefficient P: not less than 2.7 is fertile; 2.7-1.8 fertile; 1.8-0.9 general; <0.9 barren; the formula 6 is a soil conditioner for many years of industrialization.

Adding the 6 groups of the formula soil physical property modifying agent into raw soil to perform a soil cultivation test in a greenhouse, evaluating the comprehensive fertility of the soil of each treatment group after 30 days, and detecting the physical properties such as the bulk density, infiltration rate, air permeability and the like of the raw soil, wherein the increase effect of the formula 1 on the comprehensive fertility of the raw soil is higher than that of the other 5 groups of the formula shown in the figure 26; the formula 1 has better effect of improving the bulk density of the original soil than other 5 groups of formulas; the increase effect of the formula 1 on the original soil infiltration rate and the air permeability is higher than that of the other 5 groups of formulas.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the technical scope of the present invention, and those skilled in the art may make modifications and variations within the spirit of the present invention, and all modifications, equivalents and modifications of the above embodiments according to the technical spirit of the present invention are within the scope of the present invention.

Claims (10)

1. The modifier for the physical properties of the green land soil is characterized by mainly comprising the following components: organic waste compost, wood biochar, rice hull ash, coconut coir, attapulgite powder and a microbial agent.

2. The modifier for physical properties of green soil, according to claim 1, wherein the volume percentage of the components of the modifier is: composting organic wastes: wood charcoal: rice husk charcoal: coconut husk: the attapulgite powder comprises 40-55% of attapulgite, 2-4% of attapulgite, and 0.5-1% of attapulgite.

3. The physical property improver for the green land soil according to claim 1, wherein the volume percentage of the component microbial agent of the improver is 0.5%, and the improver is diluted to 400-500 times when in use.

4. The modifier for improving physical properties of green soil as claimed in claim 1, wherein the organic waste compost is compost obtained by decomposing and sieving high-temperature fermented compost; the pH value is 7.0-8.0, the EC value is more than or equal to 2.0mS/cm, and the volume weight is 0.45-0.65 g/cm³The grain diameter is less than or equal to 35 mm.

5. The physical property improver for the green land soil according to claim 1, wherein the wood charcoal is a residual carbon-rich solid byproduct generated after wood or branches are pyrolyzed in an anaerobic or hypoxic state, and the particle size is 1.5-5 mm.

6. The modifier for improving physical properties of green soil according to claim 1, wherein the rice husk carbon is a high-temperature carbonized product of rice husk, has a pH value of 8-10, and has a particle size of 0.5-1.5 mm.

7. The modifier for improving physical properties of green soil as claimed in claim 1, wherein the coconut coir is a processed coconut byproduct or waste coconut husk fiber powder, the pH value is 5.5-7.0, the EC value is not more than 0.5mS/cm, and the particle size is 0.5-6 mm.

8. The physical property improver for the soil of a green land as claimed in claim 1, wherein the attapulgite powder is obtained by grinding an aqueous magnesium-rich aluminosilicate clay mineral having a chain layered structure through a 80-mesh sieve, and has a particle size of 0.18mm or less.

9. The physical property improver for the green land soil according to claim 1, wherein the microbial agent is prepared by compounding various biocontrol bacteria such as bacillus and serratia, and the pH value is 6.5-8.0.

10. The use method of the modifier for physical properties of green soil as claimed in any one of claims 1 to 9, wherein the use method comprises the following steps:

step 1, ploughing original soil of a soil layer according to a specified depth;

step 2, applying the physical property improver of the soil with the same volume as the original soil in the ploughing process and fully mixing;

and 3, wetting by spraying water, and then uniformly spraying the microbial agent with the volume percentage of 0.5 percent diluted by 500 times to an improved area.

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