CN111149457A - Coastal saline-alkali soil engineering improvement system and method - Google Patents
Coastal saline-alkali soil engineering improvement system and method Download PDFInfo
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01B—SOIL WORKING IN AGRICULTURE OR FORESTRY; PARTS, DETAILS, OR ACCESSORIES OF AGRICULTURAL MACHINES OR IMPLEMENTS, IN GENERAL
- A01B77/00—Machines for lifting and treating soil
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01B—SOIL WORKING IN AGRICULTURE OR FORESTRY; PARTS, DETAILS, OR ACCESSORIES OF AGRICULTURAL MACHINES OR IMPLEMENTS, IN GENERAL
- A01B79/00—Methods for working soil
- A01B79/02—Methods for working soil combined with other agricultural processing, e.g. fertilising, planting
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G24/00—Growth substrates; Culture media; Apparatus or methods therefor
- A01G24/40—Growth substrates; Culture media; Apparatus or methods therefor characterised by their structure
- A01G24/44—Growth substrates; Culture media; Apparatus or methods therefor characterised by their structure in block, mat or sheet form
- A01G24/46—Growth substrates; Culture media; Apparatus or methods therefor characterised by their structure in block, mat or sheet form multi-layered
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K17/00—Soil-conditioning materials or soil-stabilising materials
- C09K17/40—Soil-conditioning materials or soil-stabilising materials containing mixtures of inorganic and organic compounds
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B11/00—Drainage of soil, e.g. for agricultural purposes
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- General Engineering & Computer Science (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Organic Chemistry (AREA)
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Abstract
The invention discloses a coastal saline-alkali soil engineering improvement system and a method, which comprises a large pit dug in saline-alkali soil, wherein the bottom of the pit is provided with a salt discharge ditch, an isolation layer is arranged in the large pit, the isolation layer is paved on all side walls of the pit, the bottom of the pit and the salt discharge ditch, and a planting soil layer, an original soil layer and a salt discharge layer are sequentially arranged in the large pit from top to bottom. The system and the method of the invention realize the effects of cutting off the saline water infiltration channel, quickly discharging salt and reversely infiltrating and fully utilizing the original soil resource, quickly achieve the aims of improving the quality of the severe saline-alkali soil, increasing the survival rate of the greening plants and improving the greening level of the severe saline-alkali soil with lower cost, and can not cause the saline-alkali soil to return salt to the planting soil.
Description
Technical Field
The invention belongs to the technical field of saline-alkali soil improvement engineering, and particularly relates to a coastal saline-alkali soil engineering improvement system and method.
Background
The total area of the coastal saline-alkali soil in China reaches 500 multiplied by 104hm2With the increasing urgency of economic development and urban construction on the demand of land resources, the improvement and utilization of saline-alkali soil becomes an important direction for developing reserve land resources, and the dredger fill engineering of reclamation of land by dredger fill sludge is developed vigorously. By the end of 2007, the area of the dredger fill in China reaches 540km2The area of the Chinese dredger fill reaches 1500km by 20152Above, the planned reclamation area reaches 600km only in Tianjin coastal new areas and Hebei Caofen Dian to 20202The area of the coastal saline-alkali soil is further enlarged. Coastal saline-alkali soil, particularly dredger fill, has the characteristics of high salt content, easy alkalization, poor nutrients, heavy soil texture, extremely high permeability, high salinity of underground water, shallow burial and the like, seriously influences the agriculture and forestry production, and greening on the dredger fill with insanitary weeds is an internationally recognized 'worldwide problem'.
At present, the saline-alkali soil greening of China generally adopts engineering measures of 'engineering salt avoidance + soil replacement'; the engineering salt avoidance generally adopts physical measures to improve the saline-alkali condition of soil, namely, the purposes of regulating and controlling the water and salt movement of the soil, inhibiting the evaporation of the soil and improving the salt infiltration and leaching are achieved by changing the physical structure of the soil. The methods of open ditches, blind pipes, hidden pipes, layer drenching and the like are the more common physical improvement measures at present. The concealed conduit salt elimination is a mature saline-alkali land treatment method for eliminating salt by using a plastic corrugated concealed conduit, has the advantages of quick response, good effect, moderate cost and land saving, and is widely applied to coastal areas in China. But the technology has high requirements on machinery and fields and is suitable for mechanized operation of leveling land in large area. A leaching layer and a blind ditch are arranged at a certain depth of saline-alkali soil, and the method is also a common method for improving and utilizing saline-alkali soil in coastal areas. The salt is discharged from the open ditch by utilizing the lateral seepage of the soil body, can be used independently, and can also be used in combination with methods such as a drenching layer, a blind ditch, a hidden pipe and the like.
Although the methods can achieve the effects of removing salt and reducing salt to a certain extent, the methods are applied above the underground water level, and if the burial depth exceeds the underground water level, the methods cannot resist reverse osmosis and side osmosis of underground saline water and cannot achieve the effects of removing salt and reducing salt. The underground water level of the coastal region is influenced by multiple factors such as climate, seawater and the like, the fluctuation is large, and the influence on the soil body is larger when the underground water level is closer to the seaside and the change is larger.
In addition, a method for raising the terrain is also provided for solving the problems of too shallow buried depth and large fluctuation of the underground water level, the elevation of the green land is raised by climbing on the terrain, the elevation is generally raised by 1-2m on the original terrain, the green land is further far away from the underground high-salinity water, and the influence of the high-salinity capillary water is reduced, so that the improved soil is ensured not to be salinized any more, and the greening can be normally carried out. However, the method has the following defects that the elevation of the green land needs to increase a large amount of earth volume, is not economical and consumes a large amount of soil resources, and after the elevation of the green land, runoff rainwater flows into peripheral facilities such as peripheral roads during rainfall so as to increase the drainage pressure and waterlogging risk of the roads, and meanwhile, the soil of the green land scours the road surface along with the runoff, so that the problem of runoff pollution such as mud left after the rain of the roads is caused.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a coastal saline-alkali soil engineering improvement system and method, which solve the problems in the prior art that the soil salinity of coastal saline-alkali areas is high, the soil quality is poor, the underground saline water level fluctuation is large, and greening plants are difficult to grow.
The technical scheme of the invention is as follows:
the utility model provides a coastal saline-alkali soil engineering improvement system, includes the big hole of digging out in saline-alkali soil, and the hole bottom is provided with the salt drain ditch, sets up the isolation layer in the big hole, all lateral walls, the hole bottom and the salt drain ditch that the isolation layer paved the hole, from the top down has set gradually planting soil layer, former soil layer, salt drainage layer in the big hole.
And a drain pipe is arranged in the salt discharge ditch, coarse sand with the thickness of 4-6cm and fine sand with the thickness of 8-12cm are coated on the periphery of the drain pipe, or permeable geotextile is coated on the periphery of the drain pipe, and the outlet of the drain pipe is communicated with a municipal drainage well.
Preferably, the drain pipe is a PVC seepage pipe; more preferably, a plurality of rows of narrow strip-shaped or circular water seepage holes can be formed in the circumference, and the requirements of different ring rigidity and permeability can be met by controlling the opening rate; the drain outlet leads to a municipal drainage well.
The depth of the big pit is 0.6-1.5 m, the thickness of the planting soil layer is 30-50cm, and the thickness of the original soil layer is 30-100 cm.
The isolation layer comprises an inner waterproof geotextile layer, a waterproof membrane layer and an outer waterproof geotextile layer.
The salt discharge ditches are arranged at the bottom of the pit at intervals, the arrangement distance is 6-8 meters, and the width and the depth are 25-45 cm.
The salt removing layer is stone chips or coarse sand with the thickness of 15-22 cm; the particle size of the stone chips or coarse sand is 0.5-10 mm.
Preferably, the modifier is mixed in the original soil layer, and comprises subcritical hydrolyzed sludge, subcritical hydrolyzed chicken manure, composite bacterial manure and fiber adhesive.
Preferably, the mass ratio of the subcritical hydrolyzed sludge to the subcritical hydrolyzed chicken manure to the composite bacterial fertilizer to the fiber adhesive is 5-15: 1-3: 20-50: 100-150.
A coastal saline-alkali soil engineering improvement method comprises the following steps:
1) setting an isolation layer: digging 0.6-1.5 m above the ground water level in the range of the saline-alkali soil to form a large pit, digging a salt discharge ditch at the bottom of the pit, using a waterproof material as an isolation layer in the large pit, and paving all side walls, the bottom of the pit and the salt discharge ditch;
2) arranging a salt discharge ditch: the salt discharge ditch is arranged at intervals of 6-8 meters, the width and the depth are 25-45cm, the gradient is 1-3 per mill, a drain pipe is placed in the middle of the salt discharge ditch, coarse sand with the thickness of 4-6cm and fine sand with the thickness of 8-12cm or permeable geotextile coated on the periphery of the drain pipe are filled in the drain pipe to serve as a reverse filter layer, and the outlet of the drain pipe is communicated with a municipal drainage well;
3) arranging a salt draining layer: paving stone chips or coarse sand with the thickness of 15-22cm above the pit bottom isolation layer to serve as a spraying layer; on one hand, the saline water can be quickly discharged, and on the other hand, the reverse osmosis of the saline water through the capillary can be prevented;
4) setting an original soil layer: crushing raw soil, uniformly mixing to avoid large soil blocks to obtain crushed raw soil; filling crushed raw soil with the thickness of 30-100cm above the salt removing layer to obtain a raw soil layer; modifying agent can be mixed into the crushed raw soil according to the requirement; the modifier comprises subcritical hydrolyzed sludge, subcritical hydrolyzed chicken manure, compound bacterial manure and fiber adhesive; the mass ratio of the subcritical hydrolyzed sludge to the subcritical hydrolyzed chicken manure to the composite bacterial fertilizer to the fiber adhesive is 5-15: 1-3: 20-50: 100-150.
5) Setting a planting soil layer: laying 30-50cm of planting soil above the original soil layer; the surface of the planting soil layer is basically level with the surface of the original saline-alkali soil; the planting soil layer is a layer where plant roots are distributed and grow in a large quantity, so that the planting soil can adopt light saline-alkali soil, original soil added with soil conditioner, gardening planting soil, alien soil or other culture substances with low saline-alkali degree according to actual conditions.
The invention has the beneficial effects that: the system and the method of the invention realize the effects of cutting off the saline water infiltration channel, quickly discharging salt and reversely infiltrating and fully utilizing the original soil resource, quickly achieve the aims of improving the quality of the severe saline-alkali soil, increasing the survival rate of the greening plants and improving the greening level of the severe saline-alkali soil with lower cost, and can not cause the saline-alkali soil to return salt to the planting soil.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 shows the variation of the salinity of the soil in a 0-30cm soil layer under different treatment measures;
FIG. 3 shows the variation of the salinity of the soil in a soil layer of 30-60cm under different treatment measures;
FIG. 4 shows the variation of the salinity of the soil in the soil layer of 60-90cm under different treatment measures;
FIG. 5 shows the variation of eight major ion contents in soil;
FIG. 6 shows the canopy width of pasture grasses under different soil improvement methods.
Detailed Description
In order to more clearly illustrate the invention, the invention is further described below in connection with preferred embodiments. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings that is solely for the purpose of facilitating the description and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and is therefore not to be construed as limiting the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
Referring to fig. 1, the coastal saline-alkali soil engineering improvement system 500 of the invention comprises a large pit dug in saline-alkali soil 600, a planting soil layer 501, an original soil layer 502, a salt discharge layer 503, a salt discharge ditch 504 and an isolation layer 505 which are arranged in the large pit from top to bottom;
an isolation layer 505 is arranged in the large pit, and the isolation layer 505 is paved on all side walls of the pit, the bottom of the pit and the salt discharge trench 504;
the salt discharge ditch 504 is arranged at the bottom of the pit, a drain pipe 506 is arranged in the salt discharge ditch 504, and coarse sand 507 with the thickness of 4-6cm and fine sand 508 with the thickness of 8-12cm are coated around the drain pipe 506 or permeable geotextile is coated; the coarse sand 507 and the fine sand 508 are coated outside the pipe, or the permeable geotextile can play a role in water permeation and prevent silt from entering a drain pipe to cause blockage; the outlet of the drain pipe leads to a municipal drainage well; the grain size of the coarse sand 507 is 0.5-2 mm; the grain size of the fine sand 508 is 0.25-0.4 mm;
a salt discharge layer 503 is arranged above the pit bottom isolation layer 505 and the salt discharge ditch 504;
an original soil layer 502 is arranged above the salt discharging layer 503;
a planting soil layer 501 is arranged above the original soil layer 502.
In the areas with high mineralization of underground water and irregular or large fluctuation of water level, the invention adopts a method of combining physical isolation measures and salt discharge measures to ensure the normal growth of greening plants, thereby avoiding the invasion of underground saline water to soil bodies to the greatest extent.
According to certain preferred embodiments of the present invention, the depth of the large pit is 1.2-1.5 m (if the groundwater level is high, the depth can be shortened according to actual conditions).
According to certain preferred embodiments of the present invention, the isolation layer 505 includes an inner waterproof geotextile layer, a waterproof membrane layer, and an outer waterproof geotextile layer. The isolation layer 505 can ensure that water permeates into the saline-alkali soil layer below and is lost; the saline water in the saline-alkali soil layer can be prevented from reversely permeating into the large pit and even reversely permeating into the planting soil layer 501, so that the planting soil layer 501 is damaged; in addition, the inner waterproof geotextile layer is also beneficial to enhancing the toughness and strength of the isolation layer 505 and preventing broken stones and the like from damaging the isolation layer 505; likewise, the outer waterproof geotechnical layer also helps prevent damage to the barrier 505 from the saline-alkali soil outside the large pit.
According to certain preferred embodiments of the present invention, the salt discharge ditches 504 are arranged at intervals at the bottom of the pit, the intervals are 6-8 meters, and the width and the depth are 35-45 cm.
According to certain preferred embodiments of the present invention, the drain pipe 506 is a PVC seepage pipe; more preferably, a plurality of rows of narrow-strip-shaped water seepage holes can be formed on the circumference of the water drainage pipe 506, and the requirements of different ring rigidity and permeability can be met by controlling the opening rate.
According to certain preferred embodiments of the present invention, the salt-removing layer 503 is stone chips or grit with a thickness of 15-22 cm; the particle size of the stone chips or coarse sand is 0.5-10 mm.
According to certain preferred embodiments of the present invention, the raw soil layer 502 is raw saline-alkali earth ground particles having a thickness of 30 to 80 cm; preferably, modifying agents can be mixed into the original soil layer 502 according to needs; generally speaking, modifiers such as organic fertilizers, turfy soil, mountain leather sand and the like are mostly adopted for improving the prior saline-alkali soil; preferably, the modifier used in the invention comprises subcritical hydrolyzed sludge, subcritical hydrolyzed chicken manure, composite bacterial manure and fiber adhesive (all existing commodities such as subcritical hydrolyzed sludge and subcritical hydrolyzed chicken manure produced by Shanghai environmental protection member company, the composite bacterial manure is a composite microbial manure commodity produced by Weifang Shenzhou biofertilizer Limited company, and the fiber adhesive is a soil fiber adhesive commodity produced by Henan Luteng chemical products commerce and trade Limited company).
The mass ratio of the subcritical hydrolyzed sludge to the subcritical hydrolyzed chicken manure to the composite bacterial fertilizer to the fiber adhesive is 5-15: 1-3: 20-50: 100-150.
Experiments show that the improvement effect of the modifier is improved by 30-100% compared with the conventional saline-alkali soil modifier, such as organic fertilizer, turfy soil, mountain leather sand and the like.
According to certain preferred embodiments of the present invention, the planting soil layer 501 has a thickness of 30 to 50 cm; various plants 509 can be planted on the planting soil layer.
The setting method of the coastal saline-alkali soil engineering improvement system comprises the following steps:
1) setting an isolation layer: digging 1.2-1.5 meters above the underground water level in the range of saline-alkali soil to form a large pit, digging a salt discharge ditch at the bottom of the pit, using an inner waterproof geotextile layer, a waterproof membrane layer and an outer waterproof geotextile layer as isolation layers in the large pit, and laying all side walls, the bottom of the pit and the salt discharge ditch;
2) arranging a salt discharge ditch: the salt discharge ditch is arranged at intervals of 6-8 meters, the width and the depth are both 35-45cm, the gradient is 1-3 per mill, a drain pipe is placed in the middle of the salt discharge ditch, coarse sand with the thickness of 4-6cm is filled around the drain pipe, fine sand with the thickness of 8-12cm is added, or permeable geotextile is coated on the drain pipe to serve as a reverse filter layer; the outlet of the drain pipe leads to a municipal drainage well;
3) arranging a salt draining layer: paving stone chips or coarse sand with the thickness of 15-22cm above the pit bottom isolation layer to serve as a spraying layer; on one hand, the saline water can be quickly discharged, and on the other hand, the reverse osmosis of the saline water through the capillary can be prevented;
4) setting an original soil layer: crushing raw soil, uniformly mixing to avoid large soil blocks to obtain crushed raw soil; filling crushed raw soil with the thickness of 30-80cm above the salt removing layer to obtain a raw soil layer;
5) setting a planting soil layer: laying 30-50cm of planting soil above the original soil layer; the surface of the planting soil layer is basically level with the surface of the original saline-alkali soil; the planting soil layer is a layer where plant roots are distributed and grow in a large quantity, so that the planting soil can adopt light saline-alkali soil, original soil added with soil conditioner, gardening planting soil, foreign soil or other culture substances with low saline-alkali degree and the like according to actual conditions.
The saline-alkali soil salinity can be improved by utilizing a manual spraying or rainwater intermittent or continuous spraying improvement system.
Effect test of the invention
1. Experimental area
The test area is located in a seedling base of a municipal landscape company of Tianjin ecological city, the salt content of the whole soil is higher than 5-10g/kg, and the surface aggregation phenomenon is obvious; the pH is between 8.5 and 9.0, the soil texture is mainly heavy soil and clay, the volume weight is 1.4 to 1.7g/cm3, the aeration and water permeability are poor, and the desalting is difficult; the average content of organic matters in the soil is 5.5-19g/kg, which belongs to the level below the medium level; the mineralization degree of water of reservoirs, farms, salt farms, wastelands and ponds adjacent to the region is above 10g/L, the water of canal canals and ditches of farmlands is 5g/L-8.5g/L, the underground water is saline water, and the burial depth is 1.5-1.2 m; comprehensive conditions show that in an experimental area, the salt content of soil is high, the soil is heavy in viscosity, and underground water is saline water, so that greening and planting cannot be directly carried out.
2. Experimental methods
The conventional method for greening the local saline-alkali area is adopted, namely, a nitre drenching layer is directly paved above the underground water level by 20cm, original soil is backfilled by 80cm, a geomembrane is backfilled by 40cm, the control treatment of the treatment method is realized, the same mixed sowing pasture is planted in the two treatments, the salt content of the soil is measured at several key time nodes, and the improvement effect comparison is carried out on the content of eight major ions in the soil. The sampling time is set at 2016, 3, 2016, 4, 2016, 8, 2016, 11 and 2017, 5, which is the background value investigation before improvement of engineering, irrigation completion after seedling planting, rainfall leaching completion in rainy season, salt return period in autumn and salt return period in spring of the next year.
3. The experimental effect is as follows: the experimental effect is shown in fig. 2-5.
From the salt content of the soil profile (see fig. 2-5), after the treatment by the method of the invention, the salt content of each soil layer of each important event node is obviously lower than that of the control treatment, which shows that the method of the invention obviously reduces the salt content of the soil body.
The salinity of Tianjin coastal saline-alkali soil is mainly NaCl and mostly comes from underground saline water. From 2016 autumn to 2017 spring, namely non-rainy season, under the condition of no irrigation, the soil salt content of a 0-30cm soil layer changes, the method can effectively prevent the accumulation of NaCl, and the method is shown from the side to effectively block the ascending channel of the underground saline water.
Referring to fig. 6, comparing the growth conditions of the pasture grasses under different soil improvement methods, it can be seen that, by applying the method of the present invention, the average value of the crown width of the pasture grasses is 91.3cm, which is significantly higher than that of the control treatment of 51.7cm, indicating that the method effectively improves the growth environment of the plants.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. Not all embodiments are exhaustive. All obvious changes and modifications which are obvious to the technical scheme of the invention are covered by the protection scope of the invention.
Claims (10)
1. The utility model provides a coastal saline-alkali soil engineering improvement system which characterized in that includes the big hole of digging out in saline-alkali soil, and the hole bottom is provided with the salt drain ditch, sets up the isolation layer in the big hole, all lateral walls, the hole bottom and the salt drain ditch that the hole was covered with to the isolation layer have set gradually planting soil layer, former soil layer, salt drainage layer from the top down in the big hole.
2. The coastal saline-alkali soil engineering improvement system according to claim 1, wherein a drain pipe is arranged in the salt discharge ditch, the periphery of the drain pipe is coated with coarse sand with the thickness of 4-6cm and fine sand with the thickness of 8-12cm, or coated with a permeable geotextile, and the outlet of the drain pipe is communicated with a municipal drain well.
3. The improvement system for coastal saline-alkali soil engineering according to claim 2, wherein the drainage pipe is formed with a plurality of rows of narrow strip-shaped or circular water seepage holes on the circumference.
4. The coastal saline-alkali soil engineering improvement system of claim 1, wherein the depth of the large pit is 0.6-1.5 m, the thickness of the planting soil layer is 30-50cm, and the thickness of the original soil layer is 30-100 cm.
5. The coastal saline-alkali soil engineering improvement system of claim 1, wherein the insulation layer comprises an inner waterproof geotextile layer, a waterproof membrane layer and an outer waterproof geotextile layer.
6. The improvement system for coastal saline-alkali soil engineering according to claim 1, wherein the salt discharge ditches are arranged at the bottom of the pit at intervals of 6-8 m, and have a width and a depth of 25-45 cm.
7. The coastal saline-alkali soil engineering improvement system of claim 1, wherein the salt drainage layer is stone chips or coarse sand with a thickness of 15-22 cm; the particle size of the stone chips or coarse sand is 0.5-10 mm.
8. The coastal saline-alkali soil engineering improvement system of claim 1, wherein an improver is mixed in the original soil layer, and the improver comprises subcritical hydrolyzed sludge, subcritical hydrolyzed chicken manure, composite bacterial manure and fiber adhesive.
9. The coastal saline-alkali soil engineering improvement system of claim 1, wherein the mass ratio of the subcritical hydrolyzed sludge, the subcritical hydrolyzed chicken manure, the composite bacterial fertilizer and the fiber adhesive is 5-15: 1-3: 20-50: 100-150.
10. A coastal saline-alkali soil engineering improvement method is characterized by comprising the following steps:
1) setting an isolation layer: digging 1.2-1.5 meters above the underground water level in the range of the saline-alkali soil to form a large pit, digging a salt discharge ditch at the bottom of the pit, using a waterproof material as an isolation layer in the large pit, and paving all side walls, the bottom of the pit and the salt discharge ditch;
2) arranging a salt discharge ditch: the salt discharge ditch is arranged at intervals of 6-8 meters, the width and the depth are both 35-45cm, the gradient is 1-3 per mill, a drain pipe is placed in the middle of the salt discharge ditch, coarse sand with the thickness of 4-6cm and fine sand with the thickness of 8-12cm or permeable geotextile are filled around the drain pipe to serve as a reverse filter layer, and the outlet of the drain pipe is communicated with a municipal drainage well;
3) arranging a salt draining layer: paving stone chips or coarse sand with the thickness of 15-22cm above the pit bottom isolation layer to serve as a spraying layer; on one hand, the saline water can be quickly discharged, and on the other hand, the reverse osmosis of the saline water through the capillary can be prevented;
4) setting an original soil layer: crushing raw soil, uniformly mixing to avoid large soil blocks to obtain crushed raw soil; filling crushed raw soil with the thickness of 30-100cm above the salt removing layer to obtain a raw soil layer; modifying agent can be mixed into the crushed raw soil according to the requirement; the modifier comprises subcritical hydrolyzed sludge, subcritical hydrolyzed chicken manure, compound bacterial manure and fiber adhesive; the mass ratio of the subcritical hydrolyzed sludge to the subcritical hydrolyzed chicken manure to the composite bacterial fertilizer to the fiber adhesive is 5-15: 1-3: 20-50: 100-150.
5) Setting a planting soil layer: laying 30-50cm of planting soil above the original soil layer; the surface of the planting soil layer is basically level with the surface of the original saline-alkali soil; the planting soil layer is a layer where plant roots are distributed and grow in a large quantity, so that the planting soil can adopt light saline-alkali soil, original soil added with soil conditioner, gardening planting soil, alien soil or other culture substances with low saline-alkali degree according to actual conditions.
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| CN112166730A (en) * | 2020-11-02 | 2021-01-05 | 青岛农业大学 | Inverted convex planting ditch for saline-alkali soil and construction method and application thereof |
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