Method for afforestation in arid region

Abstract

The invention provides a method for afforestation in arid regions, and relates to the field of afforestation. The method comprises the following specific steps: S1, digging holes; s2, fertilizer is put into one side in the pit; s3, a barrel-shaped first thin film is laid in the pit; s4, the pit is backfilled with soil for the first time; s5, adding water-retaining agent dry particles into the pits, and watering the pits until the water-retaining agent dry particles absorb water and expand into gel solids; s6, the center position of the gel solid in the pit is backfilled with soil for the second time; S7, the saplings are planted in the soil pile stand columns backfilled for the second time at the same time; in the planting process, the soil backfilled for the second time is tamped downwards and makes full contact with the soil backfilled for the first time, so that the gel solid overflows upwards from the gaps and wraps the soil backfilled for the second time and the planted saplings, and the surface of the gel solid is covered with the remaining soil backfilled for the second time; s8, the surface of the soil backfilled for the second time is covered with a thin film for the second time; and S9, the remaining soil is backfilled for the third time and covered with the film for the second time, and the soil is tamped. The method can improve sapling survival rate, reduce cost and promote sapling growth.

Description

Technical Field

[0001] The invention relates to the field of afforestation, and in particular to a method for afforestation in arid areas. Background Art

[0002] The ecosystems in arid, semi-arid and desert areas are fragile, with low vegetation coverage and serious soil erosion. Afforestation can effectively prevent wind and sand invasion, reduce the impact of sandstorms, improve soil quality, and increase water retention capacity, providing good basic conditions for local agricultural development and ecological construction. At the same time, planting trees can increase biodiversity, maintain ecological balance, and prevent further damage to the ecological environment. However, due to factors such as dry climate, lack of water resources, and poor soil in these areas, afforestation projects have progressed slowly and the survival rate of trees is low. Summary of the invention

[0003] The purpose of the present invention is to provide a method for afforestation in arid areas, which can improve the survival rate of seedlings, reduce costs and promote the growth of seedlings.

[0004] The present invention solves the technical problem by adopting the following technical solutions.

[0005] Solution 1, a method for afforestation in arid areas, comprising the following steps:

[0006] S1, digging pits;

[0007] S2, adding fertilizer to one side of the pit;

[0008] S3, laying a barrel-shaped first film in the pit, wherein the barrel mouth of the first film is higher than the pit mouth; and a plurality of needle-shaped small holes are opened at the barrel mouth;

[0009] S4, backfilling the pit with soil for the first time;

[0010] S5, adding gel solid into the pit; or adding water retaining agent dry particles into the pit, and then watering the pit until the water retaining agent dry particles absorb water and swell into gel solid;

[0011] S6, backfilling soil into the center of the gel solid in the pit for the second time;

[0012] S7, and at the same time, plant the seedlings in the second backfill soil pile column. When planting, tamp the second backfill soil downwards and fully contact it with the first backfill soil, so that the gel solid overflows upward from the gap, wraps the second backfill soil and the planted seedlings, and covers the surface of the gel solid with the remaining second backfill soil;

[0013] S8, folding the barrel mouth of the first film to cover the surface of the second backfill soil;

[0014] S9, backfill the remaining soil for the third time, cover the part where the film was folded for the first time, and compact the soil.

[0015] It should be noted that the first barrel-shaped film in S3 is higher than the hole mouth, and the height of the higher film must be sufficient to completely cover the second backfill soil and all the soil around the seedlings after the barrel mouth is folded over in S8. Secondly, in S3, a plurality of small pinholes are set at the beginning of the barrel mouth, and the positions of the plurality of small pinholes should be from the barrel-shaped film 10 cm below the hole, and there are a plurality of small pinholes.

[0016] In this scheme 1, the barrel-shaped first film is customized, and the customized size should be 10 cm larger than the diameter of the pit. Secondly, the barrel-shaped film is opened at the corresponding position of the pit mouth, which is convenient for laying the film on the ground and folding it back to cover the saplings, which is convenient for operation.

[0017] Solution 2: This embodiment of the present invention provides a method for afforestation in arid areas, comprising the following steps:

[0018] S1, digging pits;

[0019] S2, adding fertilizer to one side of the pit;

[0020] S3, laying the first membrane in a barrel shape in the pit;

[0021] S4, backfilling the pit with soil for the first time;

[0022] S5, adding dry particles of water retaining agent into the pit, and watering the pit until the dry particles of water retaining agent absorb water and swell into a gel solid;

[0023] S6, backfill soil to the center of the gel solid in the pit for the second time,

[0024] S7, and at the same time, plant the seedlings in the second backfill soil pile column; when planting, tamp the second backfill soil downwards and fully contact it with the first backfill soil, so that the gel solid overflows upward from the gap, wraps the second backfill soil and the planted seedlings, and covers the surface of the gel solid with the remaining second backfill soil;

[0025] S8, covering the second backfilled soil surface with a second film; opening an opening in the middle half of the second film to facilitate the seedlings to escape from the opening, and the second film can cover the middle position tightly without air leakage, thereby reducing water evaporation loss;

[0026] S9, backfill the remaining soil for the third time, cover it on the second film, and tamp the soil.

[0027] Solution 3, an embodiment of the present invention provides a method for afforestation in arid areas, comprising the following steps:

[0028] S1, digging pits;

[0029] S2, adding fertilizer to one side of the pit;

[0030] S3, laying the first membrane in a barrel shape in the pit;

[0031] S4, backfilling the pit with soil for the first time;

[0032] S5, adding a water-retaining agent into the pit to fully absorb water and swell to form a gel solid;

[0033] S6, backfilling soil into the center of the gel solid in the pit for the second time;

[0034] S7, and at the same time, plant the seedlings in the second backfill soil pile column. When planting, tamp the second backfill soil downwards and fully contact it with the first backfill soil, so that the gel solid overflows upward from the gap, wraps the second backfill soil and the planted seedlings, and covers the surface of the gel solid with the remaining second backfill soil;

[0035] S8, covering the second backfilled soil surface with a second film; opening an opening in the middle half of the second film to facilitate the seedlings to escape from the opening, and the second film can cover the middle position tightly without air leakage, thereby reducing water evaporation loss;

[0036] S9, backfill the remaining soil for the third time, cover with the second film, and compact the soil.

[0037] Solution 4: This embodiment of the present invention provides a method for afforestation in arid areas, comprising the following steps:

[0038] S1, digging pits;

[0039] S2, adding fertilizer to one side of the pit;

[0040] S3, laying the first membrane in a barrel shape in the pit;

[0041] S4, backfilling the pit with soil for the first time; and planting the sapling in the second backfilled soil;

[0042] S5, covering the soil surface of the first backfill with a second film; opening an opening in the middle half of the second film to facilitate the seedlings to leak out from the opening, and the second film can cover the middle position tightly without air leakage, thereby reducing water evaporation loss;

[0043] S6, backfill the remaining soil for the second time, press it on the second film, and compact the soil.

[0044] Solution 5, an embodiment of the present invention provides a method for afforestation in arid areas, comprising the following steps:

[0045] S1, digging pits;

[0046] S2, adding fertilizer to one side of the pit;

[0047] S3, backfilling the pit with soil for the first time;

[0048] S4, adding gel solid into the pit; or adding water retaining agent dry particles into the pit, and then watering the pit until the water retaining agent dry particles absorb water and swell into gel solid;

[0049] S5, backfilling soil into the center of the gel solid in the pit for the second time;

[0050] S6, and at the same time plant the seedlings in the second backfill soil pile columns, during planting, tamp the second backfill soil downwards and fully contact it with the first backfill soil, so that the gel solids overflow upwards from the gaps, wrapping the second backfill soil and the planted seedlings, and covering the surface of the gel solids with the remaining second backfill soil; tamp the soil.

[0051] In the above schemes 1-5, in step S1, the size and depth of the pit are determined based on the annual rainfall, annual evaporation, soil conditions, and the type and size of the planted seedlings in the planting area.

[0052] In the above scheme, the weight ratio of the gel solid to the total backfill soil is 1:(3-4), or the multiple ratio is 1:(3-4) times.

[0053] In the above schemes 1-4, the first film is located at the bottom of the pit and is provided with 6-8 cross-shaped openings or straight openings. The length of the cross-shaped openings or straight openings is 2-3 cm, and the number and length are irregular.

[0054] In the above schemes 1-5, the thickness of the third backfill soil is 20-40 cm.

[0055] In the above schemes 1-5, the first film and the second film are both made of degradable materials, which are one of polylactic acid film and polybutylene adipate / terephthalate film.

[0056] In some embodiments of the present invention, in step S1, the size and depth of the pit are determined according to the annual rainfall, annual evaporation, soil commercial conditions, and the type and size of the planted seedlings in the planting area. For example, in desert areas with harsh climates and particularly droughts, the tree pit should be dug as large as possible, and the capacity of the pit should not be less than: the sum of the volume of the gel solid after absorbing water and the volume of the backfill soil. When designing the pit capacity, the survival rate is given priority, and the catastrophic drought weather in the later period of the area should also be considered. The larger the pit capacity, the more gel solids can be added at one time during planting to solve the problem of water shortage in the later period of extreme catastrophic drought weather.

[0057] In some embodiments of the present invention, the weight ratio of the gel solid to the total backfill soil is 1:(3-4), or a multiple ratio of 1:(3-4). The more gel solid is poured in, the longer the drought resistance lasts, and the more beneficial it will be for the survival and growth of the seedlings. In the future, there is no need for artificial watering to the seedlings to survive, and they can grow into a forest quickly and normally. Correspondingly, the larger the pits are.

[0058] It should be noted that, in the embodiments of the present invention, the dry particles of the water-retaining agent refer to the water-retaining agent that has not absorbed water and expanded, and the gel solid refers to the water-retaining agent that has absorbed water and expanded to a saturated state.

[0059] In the present invention, five embodiments are provided, specifically,

[0060] Option 1: Use barrel-shaped film and gel solid together. The customized barrel-shaped film can reduce the difficulty of construction and save planting procedures and costs.

[0061] Option 2 is to use the first film, gel solid or water-retaining agent dry particles and the second film in combination. It is practical for convenient transportation roads. Heavy-duty water tankers can directly transport water to the tree planting site, and repeatedly water the tree pits. The water-retaining agent dry particles will turn into gel solids after absorbing water, and then backfill the soil and plant. After the seedlings are planted once and the process of this option is completed, there is no need to repeatedly water or fertilize to grow a forest.

[0062] Option three is to use the first film, gel solid and second film together. It is suitable for poor traffic roads and heavy-duty water tankers that cannot directly transport water to the tree planting site. The water-retaining agent dry particles can be dissolved in the nearest water source for a few minutes in advance to absorb enough water and expand into gel solid. Then, they can be transported to the tree planting site using a variety of heavy-duty vehicles or drones, providing foresters with a variety of transportation options. The upper and lower pieces of automatically degradable plastic film and gel solid in the pit have their own advantages. After the one-time planting of seedlings is completed, there is no need to repeat watering and fertilizing. The survival rate of seedlings in the later stage is high, and the preservation rate and forestation rate are high.

[0063] Option four is to use the first film and the second film together. The first film is laid in the pit in a barrel shape, and then the soil is backfilled and the saplings are planted, and then covered with the second film. This option is suitable for areas with convenient transportation roads, and heavy-duty water tankers can easily transport water directly to the tree planting site to water the tree pits one by one.

[0064] In the tree planting schemes 1-3, the survival rate of the seedlings can reach 99%, while the survival rates of schemes 4 and 5 are slightly lower.

[0065] In the above schemes 1-5, the planting sites with unchanged traffic, such as sand barrier grids, tree branches, plastic mesh grids, etc., can use transport drones to deliver gel solids to the planting area, etc., to reduce the labor intensity of workers and reduce planting costs.

[0066] In some embodiments of the present invention, the first film laid in the pit is formed into a barrel shape, and the first film extends outside the pit. The first film is located at the bottom of the pit and has 6-8 cross-shaped openings. The purpose of the cross-shaped openings is: at any time, the cross-shaped openings can allow the excess water after the water retention and expansion in the first film of the pit and the external rainwater and snow water to penetrate and leak under the first film, avoiding excessive humidity in the first film of the pit, causing water damage and harming the seedlings; at the same time, the cross-shaped openings can provide a channel for the exchange of gas and microorganisms between the roots of the seedlings and the first and second films and the backfilled soil pile columns, playing the role of an exchange hub.

[0067] In the above scheme, fertilizer is first added into the pit, then the first film is laid, 10 cm of soil is backfilled for the first time on the first film, and then gel solid is added, and then soil is backfilled for the second time in the center of the gel solid in the pit (above the gel solid), so that there is a gap between the second backfilled soil and the pit wall, and the second backfilled soil is compacted downwards so that the second backfilled soil is in full contact with the first backfilled soil, and at the same time, the gel solid overflows upwards from the gap, wrapping the second backfilled soil and the planted seedlings.

[0068] The fertilizer is located under the barrel film, which serves the purpose of isolating fertilizer and will not harm the seedlings due to fertilizer. On the one hand, in the early stage of planting, the seedlings need less nutrients, and the fertilizer located under the gel solid can be moved to the roots of the plants through water. The fertilizer concentration in the first and second backfill soil at the roots of the plants is relatively low, which is sufficient for the initial growth of the seedlings. As the seedlings grow and the root system develops, the roots can extend into the fertilizer at the bottom and fully absorb nutrients. In the process of backfilling the soil, the gel solid will be mixed with the soil, and the backfilled dry soil will be moistened more quickly, which will be more conducive to the survival of the seedlings.

[0069] The second backfill soil has a thickness of 10-20cm, which is helpful for the seedlings to take root and germinate, as well as to grow upward and take root downward. It reserves the water and nutrients needed, and combined with the openings of the first film, it plays a role in ventilation and microbial gas exchange. The first backfill soil and the second backfill soil are soil matrices for gas and microbial exchange.

[0070] When backfilling the soil for the second time, tamp the soil downward so that the gel solid wraps this part of the soil, and plant the seedling in the soil pile column of the second backfill. The part of the soil is surrounded by gel solids. On the one hand, the soil can be used to separate the gel solids from the root part of the seedling, so that the root of the seedling does not directly contact the gel solids, avoiding excessive humidity, poor air permeability, and inability to exchange air and microorganisms with the outside world, which leads to the death of the seedling. On the other hand, the surrounding gel solids can quickly moisten the soil of the first and second backfills to achieve the humidity required for the survival and growth of the seedling, forming a "micro-reservoir" around the roots of the seedling, and locking water and nutrients for a long time. During the growth cycle of the seedling, it can slowly release water and nutrients to the seedling for a long time, which is convenient for the survival and rapid growth of the seedling. It should be noted that when planting, the roots of the plant cannot be directly planted in the gel solids to avoid the roots of the seedlings being airtight and unable to survive.

[0071] On the surface of the second backfill soil, cover the second film or fold the barrel mouth of the barrel-shaped first film back to cover it. In order to provide better exchange of gas and microorganisms, multiple pinhole-sized holes are opened on the barrel mouth of the second film and the barrel mouth of the barrel-shaped first film. The purpose of laying the barrel-shaped first film in the pit and covering the surface with the second film is to reduce the evaporation of water in the pit during hot weather, control the amount of water and nutrients in the gel solid that penetrate to the surroundings and evaporate on the ground, and minimize the loss of water and nutrients. The loss of water, nutrients and evaporation can be reduced by more than 90%, and the second film can also inhibit the growth of weeds. It should be noted that a half-side opening is opened in the middle of the second film to facilitate full contact with the seedlings when covering, without air leakage, reduce water evaporation, and lock the water and nutrients in the pit. After that, according to the backfilled soil and the water and nutrients needed during the growth of the seedlings, the locked water and nutrients are slowly and long-term released to the seedlings so that the seedlings can grow quickly. Therefore, the method of the present invention combines the advantages of each material and maximizes the advantages. Therefore, under the same conditions, the former scheme is compared with the latter traditional planting method, and the former's growth height and thickness are 2-3 years better than the latter.

[0072] In some embodiments of the present invention, the thickness of the third backfill soil is 20-40 cm.

[0073] In some embodiments of the present invention, the first film and the second film are both degradable materials, such as polylactic acid film and polybutylene adipate / terephthalate film. The degradable material can be automatically degraded within 1-2 years, the film is friendly to the soil environment without any toxic side effects, can be converted into organic fertilizer to provide nutrients for the growth of seedlings, and locks all moisture and nutrients in the pit film.

[0074] The gel solid in the present invention is a water-absorbing polymer material, which can be polyacrylamide or sodium polyacrylate resin, and can repeatedly absorb and release water for up to two to three years to provide rapid growth of trees. Therefore, the saplings will not have the problem of lack of water and nutrients during the long-term growth process, greatly reducing the problem of repeated manual watering after the saplings are planted.

[0075] Compared with the prior art, the embodiments of the present invention have at least the following advantages or beneficial effects:

[0076] The afforestation method provided by the present invention first lays a barrel-shaped first film in a pit to wrap the gel solid, soil and seedlings in the pit, which has a locking effect on the water and nutrient penetration and evaporation in the pit, can significantly reduce or reduce the loss of water and nutrients, reduce the evaporation rate, and improve the survival rate of seedlings. The fertilizer in the pit can promote the rapid growth of seedlings. The soil can absorb the water in the gel solid, so that the water enters the soil, the soil becomes moist, and the root system of the plant absorbs water and nutrients from the soil, providing the plant with sufficient water. The dehydrated water retaining agent can then absorb natural water sources such as rainwater and snow water, reduce the frequency of irrigation, and thus reduce the cost of irrigation. BRIEF DESCRIPTION OF THE DRAWINGS

[0077] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0078] Figure 1 It is a cross-sectional schematic diagram after the pit is dug in Embodiment 1 or 2 of the present invention;

[0079] Figure 2 It is a cross-sectional schematic diagram after fertilization in Example 1 or 2 of the present invention;

[0080] Figure 3 It is a cross-sectional schematic diagram after the first film is laid in Example 1 or 2 of the present invention;

[0081] Figure 4 It is a cross-sectional schematic diagram after the first backfilling of soil in Example 1 or 2 of the present invention;

[0082] Figure 5 It is a cross-sectional schematic diagram after adding the gel solid in Example 1 or 2 of the present invention;

[0083] Figure 6 It is a cross-sectional schematic diagram after the second backfilling of soil in Embodiment 1 or 2 of the present invention;

[0084] Figure 7It is a cross-sectional schematic diagram after the seedlings are planted in Embodiment 1 or 2 of the present invention;

[0085] Figure 8 This is a cross-sectional schematic diagram of the second film covering in Example 2 of the present invention;

[0086] Fig. 9 This is a schematic cross-sectional view after the third soil backfilling in Example 2 of the present invention;

[0087] Fig.10 This is a cross-sectional schematic diagram of the film after being folded for the first time in Example 1 of the present invention;

[0088] Fig.11 This is a cross-sectional schematic diagram after the third soil backfilling in Example 1 of the present invention;

[0089] Icons: 1-pit, 2-fertilizer, 3-first film, 4-first backfill soil, 5-gel solid, 6-second backfill soil, 7-sapling, 8-second film, 9-third backfill soil. DETAILED DESCRIPTION

[0090] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention will be described clearly and completely below. If the specific conditions are not specified in the embodiments, they are carried out according to conventional conditions or conditions recommended by the manufacturer. If the manufacturer of the reagents or instruments is not specified, they are all conventional products that can be purchased from the market.

[0091] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other. The present invention will be described in detail below with reference to specific embodiments.

[0092] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0093] Example 1

[0094] In a certain arid area in the northwest, a piece of forest land was selected and saplings were planted according to the method of Scheme 1. The specific steps are as follows:

[0095] S1, dig pit 1; the pit is 60 cm deep, 40 cm in diameter, and barrel-shaped;

[0096] S2, add fertilizer 2 to one side of the pit 1; it can be organic fertilizer or compound fertilizer

[0097] S3, laying a barrel-shaped first film 3 in the pit 1, the barrel mouth of the first film 3 is higher than the pit hole; and a plurality of needle-shaped small holes are opened at the barrel mouth;

[0098] S4, backfilling the pit with soil for the first time;

[0099] S5, adding gel solid 5 into the pit; or adding water retaining agent dry particles into the pit, and then watering the pit until the water retaining agent dry particles absorb water and swell into gel solid 5;

[0100] S6, backfilling soil into the center of the gel solid in the pit for the second time;

[0101] S7, and at the same time, plant the seedlings in the second backfilled soil 6. During planting, tamp the second backfilled soil 6 downwards and fully contact it with the first backfilled soil 4, so that the gel solid overflows upwards from the gap, wraps the second backfilled soil 6 and the planted seedlings 7, and covers the surface of the gel solid 5 with the remaining second backfilled soil 6;

[0102] S8, fold the barrel opening of the first film 3 to cover the surface of the second backfill soil 6; completely cover the second backfill soil 6 and the gel solid 5; open a plurality of pinhole-sized holes at the barrel opening of the first film 3;

[0103] S9, backfill the remaining soil for the third time, covering the folded part of the first film 3, with a thickness of not less than 20 cm, and compact the soil.

[0104] Example 2

[0105] In a certain arid area in the northwest, a piece of forest land was selected and saplings were planted according to the method of scheme 2. The specific steps are as follows

[0106] S1, digging a pit; the pit is 60 cm deep, 40 cm in diameter, and barrel-shaped;

[0107] S2, adding fertilizer to one side of the pit; it can be organic fertilizer or compound fertilizer;

[0108] S3, laying the first membrane in a barrel shape in the pit;

[0109] S4, backfill the pit with soil for the first time; the thickness of the first backfill soil is 10 cm;

[0110] S5, adding dry particles of water retaining agent into the pit, and watering the pit until the dry particles of water retaining agent absorb water and swell into a gel solid;

[0111] S6, backfilling the soil for the second time toward the center of the pit, the soil backfilled for the second time is filled in the middle of the gel solid, and there is a certain gap between the soil backfilled for the second time and the pit wall; wherein the thickness of the soil backfilled for the second time is 10 cm;

[0112] S7, and at the same time, plant the saplings in the second backfill soil pile column; when planting the saplings, tamp the second backfill soil downwards so that the second backfill soil is in full contact with the first backfill soil, and the gel solid overflows upwards from the gap, wrapping the second backfill soil and the planted saplings (roots and part of the stem), and the second backfill soil forms a soil pile column in the center of the pit, the gel solid is located around the second backfill soil, and the remaining second backfill soil is used to cover the surface of the gel solid;

[0113] S8, covering the second backfilled soil surface with a second film; opening a plurality of pinhole-sized holes on the second film; and opening an opening in the middle half of the second film to facilitate the seedlings to escape from the opening, and the second film can cover the middle position tightly without air leakage, thereby reducing water evaporation loss;

[0114] S9, backfill the remaining soil for the third time, cover the second film, the thickness of the third backfill soil is 20cm, and tamp the soil.

[0115] Example 3

[0116] In a certain arid area in the northwest, a piece of forest land was selected and divided into five areas of equal size, named experimental groups 1-5 in sequence. Saplings were planted according to the planting method of scheme 3. The specific steps are as follows:

[0117] Experimental Group 1:

[0118] S1, dig pit 1, the depth of pit 1 is 60cm, the diameter is 40cm, and its shape is barrel-shaped, such as Figure 1 As shown;

[0119] S2, add fertilizer 2 into one side of the pit 1; either organic fertilizer or compound fertilizer can be used; Figure 2 As shown;

[0120] S3, laying a barrel-shaped degradable black first film 3 in the pit 1; and opening 6-8 cross-shaped openings with a length of 2 cm on the first film 3 at the bottom of the pit 1, and the first film 3 extends to the outside of the upper edge of the pit 1, such as attached Figure 3 As shown;

[0121] S4, backfill the pit 1 with soil for the first time; the thickness of the first backfill soil 4 is 10 cm; Figure 4 As shown;

[0122] S5, add gel solid 5 into pit 1; Figure 5 As shown;

[0123] S6, backfill the pit 1 with soil for the second time; the soil 6 backfilled for the second time is filled in the middle position above the gel solid 5, and there is a certain gap between the soil 6 backfilled for the second time and the wall of the pit 1; wherein, the thickness of the soil 6 backfilled for the second time is 10 cm; as shown in the attached Figure 6 shown.

[0124] S7, and at the same time, plant the seedlings 7 in the second backfill soil 6 pile column, and tamp the second backfill soil 6 when planting the seedlings, so that the second backfill soil 6 is fully in contact with the first backfill soil 4, and the gel solid 5 overflows upward from the gap to wrap the second backfill soil 6 and the planted seedlings 7 (such as the attached Figure 7 As shown, the roots and part of the stems of the seedlings 7 are wrapped; the second backfill soil 6 is in the central position of the pit 1, and the supporting force of the gel solid 5 is used to form a soil pile column, the gel solid 5 is located around the second backfill soil 6, and the remaining second backfill soil 6 is used to cover the surface of the gel solid 5; as shown in the attached Figure 7 As shown;

[0125] S8, covering the surface of the second backfilled soil 6 with a second film 8; opening a plurality of pinhole-sized holes on the second film 8; Fig. 9 As shown;

[0126] S9, backfill the remaining soil for the third time and compact the soil. The thickness of the third backfill soil 9 is 40 cm. Fig.10 shown.

[0127] The weight ratio of the gel solid 5 to the total weight of the backfill soil is 1:4, or a multiple of 1:4.

[0128] Experimental Group 2:

[0129] The difference from Experimental Group 1 is that the thickness of the first backfill soil is 15 cm. The rest of the steps and parameters are the same as those of Experimental Group 1.

[0130] Experimental Group 3:

[0131] The difference from Experimental Group 1 is that the thickness of the second backfill soil is 30 cm. The rest of the steps and parameters are the same as those of Experimental Group 1.

[0132] Experimental Group 4:

[0133] The difference from Experimental Group 1 is that the thickness of the second backfill soil is 40 cm. The rest of the steps and parameters are the same as those of Experimental Group 1.

[0134] Experimental Group 5:

[0135] The difference from Experimental Group 1 is that the thickness of the first backfill soil is 10 cm, and the thickness of the second backfill soil 6 is 30 cm. The rest of the steps and parameters are the same as those of Experimental Group 1.

[0136] In the above experimental groups 1-5, the gel solid used was an acrylate / acrylamide cross-linked copolymer.

[0137] In the above five groups of forest land, the number of saplings planted in each group is 50. After the planting is completed, the saplings are no longer watered or fertilized. After 1 month, 2 months, 3 months, 6 months and 12 months, the number of surviving trees in each group is counted, and the results are shown in Table 1.

[0138] Table 1 Number of live seeds produced by each group of seedlings (saplings)

[0139]

[0140] It can be concluded from Table 1 that the experimental groups 1-5 adopt the planting method provided by the present invention, and their survival rates in the early and late stages of planting can reach 100%, and after the seedlings survive, the plants basically do not die, and the gel solids and fertilizers in the pits can continuously provide sufficient water and nutrients for the growth of the seedlings.

[0141] Example 4

[0142] In a certain arid area in the northwest, a piece of forest land was selected and saplings were planted according to the method of Scheme 4. The specific steps are as follows:

[0143] S1, digging a pit; the pit is 60 cm deep, 40 cm in diameter, and barrel-shaped;

[0144] S2, adding fertilizer to one side of the pit; it can be organic fertilizer or compound fertilizer;

[0145] S3, laying the first membrane in a barrel shape in the pit;

[0146] S4, backfill the pit with soil for the first time; and plant the saplings in the soil pile columns of the second backfill;

[0147] S5, covering the surface of the soil backfilled for the first time with a second film; a plurality of pinhole-sized holes are opened on the second film;

[0148] S9, backfill the remaining soil for the second time, press it on the second film, and tamp the soil.

[0149] Example 5

[0150] In a certain arid area in the northwest, a piece of forest land was selected and saplings were planted according to the method of Scheme 5. The specific steps are as follows:

[0151] S1, digging a pit; the pit is 60 cm deep, 40 cm in diameter, and barrel-shaped;

[0152] S2, adding fertilizer to one side of the pit; it can be organic fertilizer or compound fertilizer;

[0153] S3, backfill the pit with soil for the first time; the thickness of the first backfill soil is 10 cm;

[0154] S4, adding gel solid into the pit; or adding water retaining agent dry particles into the pit, and then watering the pit until the water retaining agent dry particles absorb water and swell into gel solid;

[0155] S5, backfilling soil into the center of the gel solid in the pit for the second time;

[0156] S6, and at the same time plant the saplings in the columns of the second backfill soil pile, and tamp the second backfill soil downwards when planting the saplings, so that the second backfill soil is in full contact with the first backfill soil, and the gel solid overflows upwards from the gap, wrapping the second backfill soil and the planted saplings; the second backfill soil forms a pile in the center of the pit, the gel solid is located around the second backfill soil, and the remaining second backfill soil is used to cover the surface of the gel solid; tamp the soil.

[0157] To sum up, the afforestation method provided by the embodiment of the present invention is to first put fertilizer in the pit, then lay the first film, and then backfill the soil for the first time. The first film wraps the gel solid, soil and seedlings in the pit, which locks the water and nutrient penetration and evaporation in the pit, and can significantly reduce or lower the loss of water and nutrients, reduce the evaporation rate, and improve the survival rate of the seedlings. The fertilizer in the pit can promote the rapid growth of the seedlings.

[0158] The embodiments described above are part of the embodiments of the present invention, rather than all of the embodiments. The detailed description of the embodiments of the present invention is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. 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.

Claims

1. A method for afforestation in arid areas, characterized in that: The following steps are involved: S1, digging pits; S2, adding fertilizer to one side of the pit; S3, laying a barrel-shaped first film in the pit, wherein the barrel mouth of the first film is higher than the pit mouth; and a plurality of needle-shaped small holes are opened at the barrel mouth; S4, backfilling the pit with soil for the first time; S5, adding gel solid into the pit; or adding water retaining agent dry particles into the pit, and then watering the pit until the water retaining agent dry particles absorb water and swell into gel solid; S6, backfilling soil into the center of the gel solid in the pit for the second time; S7, and at the same time, plant the seedlings in the second backfill soil pile column. When planting, tamp the second backfill soil downwards and fully contact it with the first backfill soil, so that the gel solid overflows upward from the gap, wraps the second backfill soil and the planted seedlings, and covers the surface of the gel solid with the remaining second backfill soil; S8, folding the barrel mouth of the first film to cover the surface of the second backfill soil; S9, backfill the remaining soil for the third time, cover the part where the film was folded for the first time, and compact the soil.

2. A method for afforestation in arid areas, characterized in that: The following steps are involved: S1, digging pits; S2, adding fertilizer to one side of the pit; S3, laying the first membrane in a barrel shape in the pit; S4, backfilling the pit with soil for the first time; S5, adding dry particles of water retaining agent into the pit, and watering the pit until the dry particles of water retaining agent absorb water and swell into a gel solid; S6, backfill soil to the center of the gel solid in the pit for the second time, S7, and at the same time, plant the seedlings in the second backfill soil pile column; when planting, tamp the second backfill soil downwards and fully contact it with the first backfill soil, so that the gel solid overflows upward from the gap, wraps the second backfill soil and the planted seedlings, and covers the surface of the gel solid with the remaining second backfill soil; S8, covering the second film on the soil surface of the second backfill; S9, backfill the remaining soil for the third time, cover it on the second film, and tamp the soil.

3. A method for afforestation in arid areas, characterized in that: The following steps are involved: S1, digging pits; S2, adding fertilizer to one side of the pit; S3, laying the first membrane in a barrel shape in the pit; S4, backfilling the pit with soil for the first time; S5, adding gel solids into the pit; S6, backfilling soil into the center of the gel solid in the pit for the second time; S7, and at the same time, plant the seedlings in the second backfill soil pile column. When planting, tamp the second backfill soil downwards and fully contact it with the first backfill soil, so that the gel solid overflows upward from the gap, wraps the second backfill soil and the planted seedlings, and covers the surface of the gel solid with the remaining second backfill soil; S8, covering the second film on the soil surface of the second backfill; S9, backfill the remaining soil for the third time, cover with the second film, and compact the soil.

4. A method for afforestation in arid areas, characterized in that: The following steps are involved: S1, digging pits; S2, adding fertilizer to one side of the pit; S3, laying the first membrane in a barrel shape in the pit; S4, backfilling the pit with soil for the first time; and planting the sapling in the second backfilled soil; S5, covering the soil surface of the first backfill with a second film; S6, backfill the remaining soil for the second time, press it on the second film, and compact the soil.

5. A method for afforestation in arid areas, characterized in that: The following steps are involved: S1, digging pits; S2, adding fertilizer to one side of the pit; S3, backfilling the pit with soil for the first time; S4, adding gel solid into the pit; or adding water retaining agent dry particles into the pit, and then watering the pit until the water retaining agent dry particles absorb water and swell into gel solid; S5, backfilling soil into the center of the gel solid in the pit for the second time; S6, and at the same time plant the seedlings in the second backfill soil pile column, during planting, tamp the second backfill soil downwards and make it fully contact with the first backfill soil, so that the gel solid overflows upwards from the gap, wraps the second backfill soil and the planted seedlings, and covers the surface of the gel solid with the remaining second backfill soil, and tamps the soil.

6. The method for afforestation in arid areas according to any one of claims 1 to 5, characterized in that: In step S1, the size and depth of the pit are determined according to the annual rainfall, annual evaporation, soil conditions, and the type and size of the planted seedlings in the planting area.

7. The method for afforestation in arid areas according to any one of claims 1 to 3 or 5, characterized in that: The weight ratio of the gel solid to the total backfill soil is 1:(3-4), or the multiple ratio is 1:(3-4) times.

8. The method for afforestation in arid areas according to any one of claims 1 to 4, characterized in that: The first film is located at the bottom of the pit and is provided with a plurality of cross-shaped openings or straight openings, wherein the lengths of the cross-shaped openings or straight openings are different from 2 to 3 cm.

9. The method for afforestation in arid areas according to any one of claims 1 to 4, characterized in that: The thickness of the third backfill soil is 20-40cm.

10. The method for afforestation in arid areas according to any one of claims 1 to 3, characterized in that: The first film and the second film are both made of degradable materials, and are one of polylactic acid film and polybutylene adipate / terephthalate film.

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