Method for efficiently recovering sand vegetation

Abstract

The invention relates to the technical field of ecological environment treatment, in particular to a method for efficiently recovering sand vegetation. Comprising the following steps: S1, collecting soil samples, respectively digging soil profiles in a vegetation recovery area and a plant growth good area, dividing soil layers according to the root growth condition and the layer change of soil texture, and collecting loose soil samples and cutting ring samples in a layered manner; s2, soil property analysis; s3, adjusting the particle size; s4, soil level transformation; s5, fertilizing the surface soil; and S6, planting plants. According to the soil particle size composition and the soil profile structure of the area with good plant growth and the content of organic matters and total nitrogen in the surface soil, the soil in the vegetation recovery area is transformed, sand vegetation recovery in arid and semi-arid areas is rapidly promoted, operation is easy, cost is low, the vegetation recovery effect is good, and the method is suitable for large-scale popularization and application. The method is suitable for ecological restoration of arid and semi-arid sand construction project disturbed areas and has high application value.

Description

Technical Field

[0001] The invention relates to the technical field of ecological environment governance, and in particular to a method for efficiently restoring vegetation in sandy land. Background Art

[0002] Arid and semi-arid areas have little rainfall, high evaporation, frequent sandstorms, and fragile ecological environments. In recent years, affected by extreme climate change and increasing human activities, regional vegetation is easily damaged, and compared with humid and semi-humid areas, vegetation restoration is difficult, which seriously threatens regional ecological security and sustainable social and economic development. The development of rapid vegetation restoration technology in arid and semi-arid areas is an urgent need for ecological restoration of development and construction projects.

[0003] Water is the limiting factor for plant survival in arid and semi-arid areas, and soil is the basis for vegetation growth. Soil structure and profile levels affect water movement and storage capacity, and thus affect vegetation growth. Traditional methods for restoring vegetation in sandy land include soil importation, fertilization, regular irrigation, and addition of soil conditioners, which are not only costly and require regular maintenance, but also have poor vegetation restoration effects. Therefore, the present invention provides a method for efficiently restoring vegetation in sandy land, which can promote the rapid restoration of vegetation in sandy land in arid and semi-arid areas, is simple to operate, has low cost, and has good vegetation restoration effects. Summary of the invention

[0004] The purpose of the present invention is to provide a method for efficiently restoring vegetation in sandy land, which can promote the rapid restoration of vegetation in sandy land in arid and semi-arid areas, has simple operation, low cost and good vegetation restoration effect.

[0005] The present invention provides a method for efficiently restoring vegetation in sandy land, comprising the following steps:

[0006] S1. Soil sample collection: dig soil profiles in the vegetation restoration area and the area with good plant growth, divide the soil layers according to the root production status and the layer changes of soil texture, and collect soil loose soil samples and ring cutter samples in each layer;

[0007] S2. Soil property analysis: analyze the properties of the collected soil samples.

[0008] S21. Determine soil bulk density;

[0009] S22. Determine the soil particle size distribution curve of the bulk soil sample;

[0010] S23. Determine the organic matter and total nitrogen content of the surface soil;

[0011] S3. Particle size adjustment: using the soil particle size composition and characteristics of the area with good plant growth as a reference, add or remove coarse particles or fine particles to the soil in the vegetation restoration area to adjust the soil particle size composition in the vegetation restoration area;

[0012] S4. Soil layer modification: Taking the soil layer thickness and compactness of the area with good plant growth as a reference, the soil profile layer and compactness of the vegetation restoration area are modified;

[0013] S5. Fertilize the topsoil. Fertilize the topsoil in the vegetation restoration area based on the organic matter and total nitrogen content of the topsoil in the area with good plant growth;

[0014] S6. Planting: Planting in the vegetation restoration area shall be carried out based on the surface plant species in the area where plants grow well.

[0015] Furthermore, the specific process of step S22 is as follows: after air-drying, the soil particles are screened to obtain soil particles with particle sizes >5mm, 2-5mm, 1-2mm, 0.5-1mm, 0.25-0.5mm, 0.10-0.25mm, 0.05-0.10mm and <0.05mm, respectively, draw a soil particle size distribution curve, and calculate the uniformity coefficient Cu and the curvature coefficient Cc.

[0016] Furthermore, in step S3, the soil particle size composition in the vegetation restoration area is controlled by screening. For soil profile layers with a relatively high coarse particle content, a certain amount of coarse particles are screened out or fine particles are added; for soil profile layers with a relatively high fine particle content, a certain amount of coarse particles are added.

[0017] Furthermore, the fertilization in step S5 may be one or more of organic fertilizer, organic-inorganic compound fertilizer or water retaining agent.

[0018] Furthermore, when the plants are planted in step S6, the shrubs are transplanted as a whole plant by digging holes, and the herbaceous plants are planted by germination and sowing in a natural soil seed bank.

[0019] Furthermore, the depth of the soil profile excavated in step S1 is not less than 0.5 meters.

[0020] Furthermore, after the particle size adjustment in step S3, the similarity of the soil particle unevenness coefficient Cu and the curvature coefficient Cc in the vegetation restoration area and the area with good plant growth is above 90%.

[0021] Furthermore, after the soil layer transformation in step S4, the similarity of soil layer thickness and bulk density between the vegetation restoration area and the area with good plant growth is above 90%.

[0022] Furthermore, after the topsoil is fertilized in step S5, the similarity of organic matter and total nitrogen content in the topsoil of the vegetation restoration area and the area with good plant growth is above 90%.

[0023] In summary, compared with the prior art, the present invention has the following advantages:

[0024] The technical solution provided by the present invention transforms the soil particle size composition, soil layer, topsoil organic matter and total nitrogen content in the vegetation restoration area according to the soil particle size composition and soil profile structure, topsoil organic matter and total nitrogen content in the area with good plant growth, promotes plant growth and enhances drought resistance, and promotes rapid recovery of sandy vegetation in arid and semi-arid areas. The method provided by the present invention is simple to operate, low in cost, and has good vegetation restoration effect. It is suitable for ecological restoration in disturbed areas of arid and semi-arid sandy construction projects and has strong application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 Flow chart of the method for restoring vegetation in sandy land according to an embodiment of the present invention;

[0027] Figure 2 This is a physical comparison diagram of the vegetation restoration area and the area with good plant growth in the embodiment of the present invention. DETAILED DESCRIPTION

[0028] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0030] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] Example

[0032] A method for efficiently restoring vegetation in sandy land, such as Figure 1 As shown, the specific process is as follows:

[0033] S1. Soil sample collection

[0034] like Figure 2 As shown in the figure, the moderately degraded vegetation area in Hangjin Banner, Inner Mongolia Autonomous Region was selected as the vegetation restoration area (referred to as Area A, with a vegetation coverage of 8%), and the area with good plant growth nearby was selected as the area with good plant growth (referred to as Area B, with a vegetation coverage of 45%). The soil profiles were excavated at a depth of 0.5 meters. According to the root growth status and the layer changes of soil texture, the soil layers in Area A were divided into 0-10cm and 10-50cm, and the soil layers in Area B were divided into 0-30cm and 30-50cm. Soil loose soil samples and ring cutter samples (volume of 100cm) were collected in layers. 3 ).

[0035] S2. Soil property analysis

[0036] The properties of the collected soil samples were analyzed.

[0037] S21. The collected soil samples were respectively subjected to the drying and weighing method to determine the soil bulk density. The specific results are shown in Table 1.

[0038] Table 1 Soil bulk density, organic matter and total nitrogen content in area A and area B

[0039]

[0040] S22. The loose soil samples collected from areas A and B were air-dried, and after being completely air-dried, the soil particles were screened to obtain soil particles of >1mm, 0.5-1mm, 0.25-0.5mm, 0.10-0.25mm, 0.05-0.10mm and <0.05mm. The percentage of particle size in each interval was calculated after weighing, and the soil particle size distribution curve was drawn. The uniformity coefficient Cu and curvature coefficient Cc were calculated. The specific results are shown in Table 2.

[0041] Table 2 Soil particle size composition in area A and area B

[0042]

[0043] S23. Determine the organic matter and total nitrogen content of the surface soil in Area A and Area B.

[0044] S3. Particle size adjustment

[0045] Taking the soil particle size composition and characteristics of area B as a reference, the differences in soil particle size composition in area A and its changes with profile levels were compared. For soil profile layers with high coarse particle content, a certain amount of coarse particles were screened out or fine particles were added. For soil profile layers with high fine particle content, a certain amount of coarse particles were added to adjust the soil particle size composition, so that the soil particle uniformity coefficient Cu and curvature coefficient Cc in area A after adjustment were kept close to those in area B, with a similarity of more than 90%.

[0046] S4. Soil layer transformation

[0047] Taking the soil layer thickness and compactness of area B as a reference, the changes in soil layer and compactness of area A were compared, and the soil after particle size adjustment was modified with reference to area B for soil layer thickness and compactness. The planting layer thickness was increased by 20 cm, and the soil bulk density was consistent with that of area B.

[0048] S5. Topsoil fertilization

[0049] Taking the organic matter and total nitrogen content of the topsoil in area B as a reference, sheep manure fermented organic fertilizer (5kg / mu) was applied to the topsoil in area A to ensure that the soil organic matter and total nitrogen content after application were consistent with those in area B.

[0050] S6. Planting

[0051] The surface plants and shrubs in area B are mainly Caragana korshinskii, with a large number, and the herbs are mainly Salsola, Echinops sphenanthera, and Corythuja serrata. The native plants and shrubs in area A are mainly narrow-leaved Caragana, with a small number, and the herbs are mainly Salsola and Setaria viridis, which are relatively sparse. Plants are planted in area A after deployment, among which the shrub Caragana is transplanted in a whole hole (50cm×50cm×50cm), and the herbaceous plants are restored through soil seed bank germination and artificial sowing. The artificial sowing amount is 14-20kg / mu, and the soil seed bank is collected from the surface 5cm soil of area B and spread on the surface of area A, with a thickness of 2cm.

[0052] Watering is carried out in the early stage of planting, and then film covering is carried out to keep moisture. According to weather conditions, watering is carried out on newly transplanted shrubs, and watering is stopped after one month.

[0053] After three months of continuous observation, the plants in area A grew well after the particle size adjustment, and the vegetation coverage increased from the original 8% to 47%, indicating that the improved soil adjustment can better meet the plant growth requirements and promote plant growth; the survival rate of shrub plants such as Caragana korshinskii after transplanting was over 80%, which significantly and rapidly promoted the vegetation restoration in the area.

[0054] The sandy soil particle size composition and thickness are different, and the aboveground vegetation types and growth vary greatly. Therefore, the sandy soil particle composition and thickness have an important impact on the restoration of aboveground vegetation. The method provided by the present invention promotes the rapid restoration of sandy vegetation in arid and semi-arid areas by regulating the soil particle size composition and soil layer thickness. It has the characteristics of simple operation, low cost, good vegetation restoration effect, etc. It is suitable for ecological restoration of disturbed areas of arid and semi-arid sandy construction projects and has strong application value.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for efficiently restoring vegetation in sandy land, characterized in that: The following steps are involved: S1. Soil sample collection: dig soil profiles in the vegetation restoration area and the area with good plant growth, divide the soil layers according to the root growth status and the layer changes of soil texture, and collect soil loose soil samples and ring cutter samples in each layer; S2. Soil property analysis: analyze the properties of the collected soil samples. S21. Determine soil bulk density; S22. Determine the soil particle size distribution curve of the bulk soil sample; S23. Determine the organic matter and total nitrogen content of the surface soil; S3. Particle size adjustment: using the soil particle size composition and characteristics of areas with good plant growth as a reference, add or remove coarse or fine particles to the soil in the vegetation restoration area to adjust the soil particle size composition in the vegetation restoration area; S4. Soil layer modification: Taking the soil layer thickness and compactness of the area with good plant growth as a reference, the soil profile layer and compactness of the vegetation restoration area are modified; S5. Fertilize the topsoil. Fertilize the topsoil in the vegetation restoration area based on the organic matter and total nitrogen content of the topsoil in the area with good plant growth; S6. Planting: Planting in the vegetation restoration area shall be carried out based on the surface plant species in the area where plants grow well.

2. The method according to claim 1, characterized in that The specific process of step S22 is as follows: after air drying, the soil particles are screened to obtain soil particles with particle sizes >5mm, 2-5mm, 1-2mm, 0.5-1mm, 0.25-0.5mm, 0.10-0.25mm, 0.05-0.10mm and <0.05mm, respectively, draw a soil particle size distribution curve, and calculate the uniformity coefficient Cu and the curvature coefficient Cc.

3. The method according to claim 1, characterized in that In step S3, the particle size composition of soil particles in the vegetation restoration area is controlled by screening. For soil profile layers with a relatively high content of coarse particles, a certain amount of coarse particles are screened out or fine particles are added; for soil profile layers with a relatively high content of fine particles, a certain amount of coarse particles are added.

4. The method according to claim 1, characterized in that: In step S5, the fertilization may be carried out by using one or more of organic fertilizer, organic-inorganic compound fertilizer or water-retaining agent.

5. The method according to claim 1, characterized in that When planting plants in step S6, shrubs are transplanted whole plants by digging holes, and herbaceous plants are planted by germination and sowing in natural soil seed banks.

6. The method according to claim 1, characterized in that The depth of the soil profile excavated in step S1 is not less than 0.5 meters.

7. The method according to claim 1, characterized in that After the particle size adjustment in step S3, the similarity between the soil particle unevenness coefficient Cu and the curvature coefficient Cc in the vegetation restoration area and the area with good plant growth is above 90%.

8. The method according to claim 1, characterized in that: After the soil layer transformation in step S4, the similarity of soil layer thickness and bulk density between the vegetation restoration area and the area with good plant growth is above 90%.

9. The method according to claim 1, characterized in that: After the surface soil is fertilized in step S5, the similarity of organic matter and total nitrogen content in the surface soil of the vegetation restoration area and the area with good plant growth is above 90%.

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