A method for planting trees in arid regions

Abstract

The application discloses a tree planting method in a drought area, and provides a biological carbon composite material, wherein calcium peroxide in the biological carbon composite material slowly reacts with water to release oxygen, the oxygen is released in a sustained manner to promote the respiration of the root system of seedlings, and then the growth of the seedlings is promoted; the biological carbon / ammonium phosphomolybdate composite and the starch coated calcium peroxide are adopted instead of directly adding calcium peroxide, because calcium peroxide slowly reacts with water to generate calcium hydroxide, the calcium hydroxide is alkaline, the root system of the seedlings likes an acidic environment, the generated calcium hydroxide is not conducive to the growth of the seedlings, and the release of hydroxyl ions can be reduced by adopting the biological carbon coating treatment; meanwhile, the ammonium phosphomolybdate is loaded on the surface and the pore structure of the biological carbon, the calcium hydroxide generated by the slow reaction of calcium peroxide with water in the application is beneficial to promoting the dissolution of the ammonium phosphomolybdate, and then the ammonium phosphomolybdate is absorbed by the seedlings, the phosphorus and molybdenum elements required by the seedlings are supplemented, and the growth of the seedlings is promoted.

Description

Technical Field

[0001] This invention relates to the field of tree planting technology, and more specifically to a method for planting trees in arid regions. Background Technology

[0002] Plant growth depends on three essential elements: sunlight, air, and soil. These elements together form the foundation of plant life activities. Under sufficient sunlight, plants absorb light energy through chlorophyll and perform photosynthesis, converting carbon dioxide and water into nutrients while releasing oxygen. During growth, the plant's root system penetrates the soil and absorbs water and nutrients from the soil through capillary action. These nutrients promote the plant's growth and development.

[0003] However, in arid regions and barren mountainous areas, plants face severe survival challenges. Insufficient water makes it difficult for plants to complete normal physiological processes, ultimately leading to wilting and death. The soil in these areas is often infertile, lacking essential minerals and organic matter, which not only fails to provide the nutrients needed for plant growth but may also exacerbate soil drought due to rapid water evaporation.

[0004] To address these issues, efforts are being made to plant trees in arid and barren regions. However, relying solely on manual methods of digging pits, watering, and planting is insufficient to ensure plant survival. In deserts and other barren areas, the dry climate, water scarcity, and poor soil conditions make it difficult for these trees to adapt to the new environment, resulting in slow growth and a relatively low survival rate.

[0005] Chinese patent document CN104170698B discloses a method for planting trees in arid and semi-arid regions, using sowing as a replacement for common planting methods. The method includes seed selection, sowing, planting, and maintenance. This patented technology abandons current common planting methods, offering greater flexibility and resulting in seedlings with better adaptability. However, the seed germination rate directly limits the final survival rate of the planted trees, and in arid regions, the germination environment is extremely harsh, making it difficult to guarantee a high survival rate. Summary of the Invention

[0006] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a method for planting trees in arid regions.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A method for planting trees in arid regions includes the following steps:

[0009] S1. Dig planting holes in the natural soil layer. After the planting holes are dug, cover the bottom of the planting holes with a 10-15cm thick layer of soil conditioner. The soil conditioner includes the following raw materials: 40-60 parts fermented cassava residue, 10-15 parts vermiculite powder, 10-20 parts sheep manure, and 15-25 parts biochar composite material.

[0010] In this step, the diameter of the planting hole is 30-40cm, and the depth of the planting hole is 25-30cm.

[0011] The soil conditioner provided by this invention includes a composite material of fermented cassava residue, vermiculite powder, sheep manure, and biochar.

[0012] In some embodiments of the present invention, the fermented cassava residue can be selected in the form of 40 parts, 42 parts, 45 parts, 48 ​​parts, 50 parts, 52 parts, 55 parts, 58 parts, or 60 parts, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0013] The preparation method of fermented cassava residue adopts existing technology. As the preferred technical solution of the present invention, the preparation method of fermented cassava residue is as follows: inoculate dried cassava residue with Lactobacillus plantarum solution, adjust the water content to 60-65% with physiological saline, mix evenly, put into polyethylene film bag, use a vacuum pump to extract the air in the bag to a vacuum state, seal, place at room temperature for solid fermentation for 7-10 days, then air dry the fermented material to a moisture content of 24-28%, and then crush it to 1-2.5mm to obtain fermented cassava residue.

[0014] Further preferably, based on the mass of cassava residue dry matter, the inoculum amount of *Lactobacillus plantarum* solution is 3-5%, and the viable bacteria content in the *Lactobacillus plantarum* solution is 3 × 10⁻⁶. 5 -5×10 5 cfu / mL.

[0015] Fermented cassava residue is a byproduct of cassava processing, rich in organic matter. This invention, through fermentation, can transform cassava residue into nutrient-rich organic fertilizer, effectively increasing the organic matter content in the soil. It can also improve the soil's aggregate structure, enhance soil aeration and permeability, making the soil looser and promoting root growth and water retention.

[0016] In some embodiments of the present invention, the vermiculite powder can be selected in the form of 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, or 15 parts, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0017] Vermiculite powder has good air permeability, which can improve soil aeration and prevent soil compaction. At the same time, due to the layered structure of vermiculite, it can retain more moisture, reduce water evaporation and loss, and help plants utilize water.

[0018] In some embodiments of the present invention, sheep manure can be selected in the form of 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, or 20 parts, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0019] Sheep manure is a high-quality organic fertilizer containing a large amount of organic matter and humus, which can significantly increase the organic matter content of the soil and improve the soil structure. At the same time, the organic matter in sheep manure can enhance the soil's water retention capacity, helping to slow down water evaporation during dry seasons, maintain soil moisture, and provide a guarantee for plant growth.

[0020] In some embodiments of the present invention, the biochar composite material can be selected in quantities of 15 parts, 16 parts, 17 parts, 18 parts, 19 parts, 20 parts, 21 parts, 22 parts, 23 parts, 24 parts, or 25 parts, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0021] Specifically, the preparation method of the biochar composite material is as follows:

[0022] (1) Disperse biochar in deionized water, then add phosphate and ammonium molybdate to it, mix well, then add acid solution, stir to react, and after the reaction is completed, filter, wash and dry to obtain biochar / ammonium phosphomolybdate complex.

[0023] (2) Calcium peroxide and sodium carboxymethyl cellulose are mixed evenly and then granulated by a granulator to obtain calcium peroxide spherical particles. Then, using the calcium peroxide spherical particles as the core, biochar / ammonium phosphomolybdate composite and starch are mixed evenly and then coated on the surface of the calcium peroxide spherical particles by a granulator. After cooling and drying, the biochar composite material is obtained.

[0024] As a preferred technical solution of the present invention, in step (1), the ratio of biochar, phosphate, ammonium molybdate and acid solution is 8-12g: 3-5g: 6-8g: 20-30mL.

[0025] Specifically, the phosphate is selected from sodium phosphate or potassium phosphate.

[0026] Specifically, the acid solution is preferably a nitric acid solution, and the concentration of the acid solution is 4-8 mol / L.

[0027] Specifically, in step (1), stirring is carried out at room temperature for 6-12 hours. For example, 6 hours, 7 hours, 8 hours, 9 hours, 10 hours, 11 hours, and 12 hours can be selected, but not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0028] As a preferred technical solution of the present invention, in step (2), the mass ratio of calcium peroxide to sodium carboxymethyl cellulose is 5-10:1-2. For example, 5:1, 5:2, 6:1, 8:2, 10:1, and 10:2 can be selected, but are not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0029] In step (2), the mass ratio of biochar / ammonium phosphomolybdate complex, starch and calcium peroxide spherical particles is 40-60:3-5:10-20.

[0030] Specifically, the starch is selected from tapioca starch, potato starch, or corn starch.

[0031] S2. Plant the seedlings with soil in the planting hole and backfill the planting hole with filler material, and then carry out routine maintenance. The filler material includes the following raw materials: 50-60 parts clay and 30-40 parts straw powder.

[0032] In some embodiments of the present invention, the clay can be selected in the form of 50 parts, 51 parts, 52 parts, 53 parts, 54 parts, 55 parts, 56 parts, 57 parts, 58 parts, 59 parts, or 60 parts; but is not limited to the listed values, and other unlisted values ​​within the range are also applicable.

[0033] In some embodiments of the present invention, the straw powder can be selected in the form of 30 parts, 31 parts, 32 parts, 33 parts, 34 parts, 35 parts, 36 parts, 37 parts, 38 parts, 39 parts, or 40 parts, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0034] Specifically, the straw powder is selected from corn straw powder, wheat straw powder, or rice straw powder.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] (1) The cassava residue, vermiculite powder and sheep manure used in this invention are common raw materials, but their utilization rate is currently low. They are often piled up or discarded in large quantities. By making them into soil conditioners, the resource utilization of waste is realized, the natural environment is effectively protected, and good economic, social and ecological benefits are created. It has a very broad market prospect.

[0037] (2) The biochar composite material provided by the present invention first generates ammonium phosphomolybdate precipitate by reacting phosphate and ammonium molybdate under acidic conditions, which adheres to the surface and pore structure of biochar to obtain a biochar / ammonium phosphomolybdate composite. Then, with calcium peroxide spherical particles as the core, the biochar / ammonium phosphomolybdate composite and starch are coated on the surface of the calcium peroxide spherical particles to obtain the biochar composite material. The calcium peroxide in the biochar composite material provided by the present invention can react slowly with water to release oxygen, and promote the respiration of the seedling roots by continuously releasing oxygen, thereby promoting the growth of the seedlings. The present invention uses the method of coating calcium peroxide with biochar / ammonium phosphomolybdate composite and starch instead of directly adding calcium peroxide. The reason is that calcium peroxide reacts slowly with water to generate calcium hydroxide, which is alkaline, while the roots of seedlings prefer a slightly acidic environment. The generated calcium hydroxide is not conducive to the growth of seedlings. By using biochar coating treatment, the release of hydroxide ions can be reduced.

[0038] (3) In this invention, ammonium phosphomolybdate is loaded on the surface and pore structure of biochar. Ammonium phosphomolybdate is almost insoluble in water and acid, but soluble in alkaline solution. In this invention, calcium hydroxide generated by the slow reaction of calcium peroxide with water helps to promote the dissolution of ammonium phosphomolybdate, which can then be absorbed and utilized by the seedlings to supplement the phosphorus and molybdenum elements needed by the seedlings and promote the growth of the seedlings. Attached Figure Description

[0039] Figure 1 This is a comparison diagram of the seedling heights using different planting methods employed in various embodiments and comparative examples of the present invention. Detailed Implementation

[0040] The present invention will be further described in detail below through specific preferred embodiments, but the present invention is not limited to the following embodiments.

[0041] It should be noted that, unless otherwise specified, all chemical reagents involved in this invention were purchased through commercial channels.

[0042] The biochar used in this invention is rice husk biochar with a mesh size of 200, purchased from Henan Jiahe Water Purification Materials Co., Ltd.; the vermiculite powder has a mesh size of 400; and the Lactobacillus plantarum is Lp90.

[0043] Example 1

[0044] A method for planting trees in arid regions includes the following steps:

[0045] S1. Dig planting holes in the natural soil layer. The diameter of the planting holes is 40cm and the depth is 30cm. After the planting holes are dug, cover the bottom of the planting holes with a 10cm thick layer of soil conditioner. The soil conditioner includes the following raw materials: 40 parts fermented cassava residue, 15 parts vermiculite powder, 20 parts sheep manure, and 20 parts biochar composite material.

[0046] The preparation method of fermented cassava residue is as follows: Lactobacillus plantarum inoculation is carried out on dried cassava residue. The inoculation amount of Lactobacillus plantarum inoculation is 5% based on the mass of the dry matter of the cassava residue, and the viable bacteria content in the Lactobacillus plantarum inoculation is 3 × 10⁻⁶. 5 The mixture was prepared with cfu / mL and physiological saline to achieve a water content of 60%. The mixture was thoroughly mixed, placed in a polyethylene film bag, and the air inside the bag was extracted to a vacuum state using a vacuum pump. The bag was then sealed and placed at room temperature for solid-state fermentation for 7 days. The fermented material was then air-dried until the water content reached 25%, and then crushed to 2mm to obtain fermented cassava residue.

[0047] The preparation method of biochar composite material is as follows:

[0048] (1) Disperse 8g of biochar in 100mL of deionized water, then add 3g of potassium phosphate and 6g of ammonium molybdate, mix well, then add 20mL of 6mol / L nitric acid solution, stir and react at room temperature for 6h, and after the reaction is complete, filter, wash and dry to obtain biochar / ammonium phosphomolybdate complex.

[0049] (2) Mix 500g of calcium peroxide with 100g of sodium carboxymethyl cellulose evenly, and then granulate it through a granulator to obtain calcium peroxide spherical particles with a particle size of 1mm. Then, using the calcium peroxide spherical particles as the core, mix 4kg of biochar / ammonium phosphomolybdate composite and 0.3kg of cassava starch evenly and then coat it onto the surface of 1kg of calcium peroxide spherical particles through a granulator. After cooling and drying, the biochar composite material is obtained.

[0050] S2. Plant the seedlings with soil in the planting hole and backfill the planting hole with filler material, and then carry out routine maintenance. The filler material includes the following raw materials: 50 parts clay and 30 parts wheat straw powder.

[0051] Example 2

[0052] A method for planting trees in arid regions includes the following steps:

[0053] S1. Dig planting holes in the natural soil layer. The diameter of the planting holes is 40cm and the depth is 30cm. After the planting holes are dug, cover the bottom of the planting holes with a 15cm thick layer of soil conditioner. The soil conditioner includes the following raw materials: 60 parts fermented cassava residue, 10 parts vermiculite powder, 10 parts sheep manure, and 25 parts biochar composite material.

[0054] The preparation method of fermented cassava residue is as follows: Lactobacillus plantarum inoculation is carried out on dried cassava residue. The inoculation amount of Lactobacillus plantarum inoculation is 5% based on the mass of the dry matter of the cassava residue, and the viable bacteria content in the Lactobacillus plantarum inoculation is 3 × 10⁻⁶. 5 The mixture was prepared with cfu / mL and physiological saline to achieve a water content of 60%. The mixture was thoroughly mixed, placed in a polyethylene film bag, and the air inside the bag was extracted to a vacuum state using a vacuum pump. The bag was then sealed and placed at room temperature for solid-state fermentation for 7 days. The fermented material was then air-dried until the water content reached 25%, and then crushed to 2mm to obtain fermented cassava residue.

[0055] The preparation method of biochar composite material is as follows:

[0056] (1) Disperse 12g of biochar in 100mL of deionized water, then add 5g of potassium phosphate and 8g of ammonium molybdate, mix well, then add 30mL of 4mol / L nitric acid solution, stir and react at room temperature for 12h, and after the reaction is complete, filter, wash and dry to obtain biochar / ammonium phosphomolybdate complex.

[0057] (2) Mix 1 kg of calcium peroxide with 0.2 kg of sodium carboxymethyl cellulose evenly, and then granulate it through a granulator to obtain calcium peroxide spherical particles with a particle size of 1 mm. Then, using the calcium peroxide spherical particles as the core, mix 6 kg of biochar / ammonium phosphomolybdate composite and 0.5 kg of cassava starch evenly and then coat it onto the surface of 2 kg of calcium peroxide spherical particles through a granulator. After cooling and drying, the biochar composite material is obtained.

[0058] S2. Plant the seedlings with soil attached into the planting hole, and backfill and cover the planting hole with filler material, followed by routine maintenance. The filler material includes the following components: 60 parts clay and 40 parts wheat straw powder.

[0059] Example 3

[0060] A method for planting trees in arid regions includes the following steps:

[0061] S1. Dig planting holes in the natural soil layer. The diameter of the planting holes is 40cm and the depth is 30cm. After the planting holes are dug, cover the bottom of the planting holes with a 12cm thick layer of soil conditioner. The soil conditioner includes the following raw materials: 50 parts fermented cassava residue, 12 parts vermiculite powder, 15 parts sheep manure, and 15 parts biochar composite material.

[0062] The preparation method of fermented cassava residue is as follows: Lactobacillus plantarum inoculation is carried out on dried cassava residue. The inoculation amount of Lactobacillus plantarum inoculation is 5% based on the mass of the dry matter of the cassava residue, and the viable bacteria content in the Lactobacillus plantarum inoculation is 3 × 10⁻⁶. 5 The mixture was prepared with cfu / mL and physiological saline to achieve a water content of 60%. The mixture was thoroughly mixed, placed in a polyethylene film bag, and the air inside the bag was extracted to a vacuum state using a vacuum pump. The bag was then sealed and placed at room temperature for solid-state fermentation for 7 days. The fermented material was then air-dried until the water content reached 25%, and then crushed to 2mm to obtain fermented cassava residue.

[0063] The preparation method of biochar composite material is as follows:

[0064] (1) Disperse 10g of biochar in 100mL of deionized water, then add 4g of potassium phosphate and 8g of ammonium molybdate, mix well, then add 30mL of 5mol / L nitric acid solution, stir and react at room temperature for 8h, and after the reaction is complete, filter, wash and dry to obtain biochar / ammonium phosphomolybdate complex.

[0065] (2) Mix 800g of calcium peroxide with 150g of sodium carboxymethyl cellulose evenly, and then granulate it through a granulator to obtain calcium peroxide spherical particles with a particle size of 1mm. Then, using the calcium peroxide spherical particles as the core, mix 5kg of biochar / ammonium phosphomolybdate composite and 0.4kg of cassava starch evenly and then coat it onto the surface of 1.5kg of calcium peroxide spherical particles through a granulator. After cooling and drying, the biochar composite material is obtained.

[0066] S2. Plant the seedlings with soil in the planting hole and backfill the planting hole with filler material, and then carry out routine maintenance. The filler material includes the following raw materials: 55 parts clay and 35 parts wheat straw powder.

[0067] Comparative Example 1

[0068] A method for planting trees in arid regions includes the following steps:

[0069] S1. Dig planting holes in the natural soil layer. The diameter of the planting holes is 40cm and the depth is 30cm. After the planting holes are dug, cover the bottom of the planting holes with a 10cm thick layer of soil conditioner. The soil conditioner includes the following raw materials: 40 parts fermented cassava residue, 15 parts vermiculite powder, 20 parts sheep manure, and 20 parts biochar.

[0070] The preparation method of fermented cassava residue is as follows: Lactobacillus plantarum inoculation is carried out on dried cassava residue. The inoculation amount of Lactobacillus plantarum inoculation is 5% based on the mass of the dry matter of the cassava residue, and the viable bacteria content in the Lactobacillus plantarum inoculation is 3 × 10⁻⁶. 5 The mixture was prepared with cfu / mL and physiological saline to achieve a water content of 60%. The mixture was thoroughly mixed, placed in a polyethylene film bag, and the air inside the bag was extracted to a vacuum state using a vacuum pump. The bag was then sealed and placed at room temperature for solid-state fermentation for 7 days. The fermented material was then air-dried until the water content reached 25%, and then crushed to 2mm to obtain fermented cassava residue.

[0071] S2. Plant the seedlings with soil in the planting hole and backfill the planting hole with filler material, and then carry out routine maintenance. The filler material includes the following raw materials: 50 parts clay and 30 parts wheat straw powder.

[0072] Compared with Example 1, no modification treatment was performed on the biochar in Comparative Example 1.

[0073] Comparative Example 2

[0074] A method for planting trees in arid regions includes the following steps:

[0075] S1. Dig planting holes in the natural soil layer. The diameter of the planting holes is 40cm and the depth is 30cm. After the planting holes are dug, cover the bottom of the planting holes with a 10cm thick layer of soil conditioner. The soil conditioner includes the following raw materials: 40 parts fermented cassava residue, 15 parts vermiculite powder, 20 parts sheep manure, and 20 parts biochar composite material.

[0076] The preparation method of fermented cassava residue is as follows: Lactobacillus plantarum inoculation is carried out on dried cassava residue. The inoculation amount of Lactobacillus plantarum inoculation is 5% based on the mass of the dry matter of the cassava residue, and the viable bacteria content in the Lactobacillus plantarum inoculation is 3 × 10⁻⁶. 5 The mixture was prepared with cfu / mL and physiological saline to achieve a water content of 60%. The mixture was thoroughly mixed, placed in a polyethylene film bag, and the air inside the bag was extracted to a vacuum state using a vacuum pump. The bag was then sealed and placed at room temperature for solid-state fermentation for 7 days. The fermented material was then air-dried until the water content reached 25%, and then crushed to 2mm to obtain fermented cassava residue.

[0077] The preparation method of biochar composite material is as follows:

[0078] Disperse 8g of biochar in 100mL of deionized water, then add 3g of potassium phosphate and 6g of ammonium molybdate, mix well, then add 20mL of 6mol / L nitric acid solution, stir and react at room temperature for 6h. After the reaction is complete, filter, wash and dry to obtain the biochar composite material.

[0079] S2. Plant the seedlings with soil in the planting hole and backfill the planting hole with filler material, and then carry out routine maintenance. The filler material includes the following raw materials: 50 parts clay and 30 parts wheat straw powder.

[0080] Compared to Example 1, Comparative Example 2 only involved loading ammonium phosphomolybdate onto the biochar.

[0081] Comparative Example 3

[0082] A method for planting trees in arid regions includes the following steps:

[0083] S1. Dig planting holes in the natural soil layer. The diameter of the planting holes is 40cm and the depth is 30cm. After the planting holes are dug, cover the bottom of the planting holes with a 10cm thick layer of soil conditioner. The soil conditioner includes the following raw materials: 40 parts fermented cassava residue, 15 parts vermiculite powder, 20 parts sheep manure, and 20 parts biochar composite material.

[0084] The preparation method of fermented cassava residue is as follows: Lactobacillus plantarum inoculation is carried out on dried cassava residue. The inoculation amount of Lactobacillus plantarum inoculation is 5% based on the mass of the dry matter of the cassava residue, and the viable bacteria content in the Lactobacillus plantarum inoculation is 3 × 10⁻⁶. 5 The mixture was prepared with cfu / mL and physiological saline to achieve a water content of 60%. The mixture was thoroughly mixed, placed in a polyethylene film bag, and the air inside the bag was extracted to a vacuum state using a vacuum pump. The bag was then sealed and placed at room temperature for solid-state fermentation for 7 days. The fermented material was then air-dried until the water content reached 25%, and then crushed to 2mm to obtain fermented cassava residue.

[0085] The preparation method of biochar composite material is as follows:

[0086] 500g of calcium peroxide and 100g of sodium carboxymethyl cellulose were mixed evenly and then granulated using a granulator to obtain calcium peroxide spherical particles with a particle size of 1mm. Then, using the calcium peroxide spherical particles as the core, 4kg of biochar and 0.3kg of cassava starch were mixed evenly and then coated onto the surface of 1kg of calcium peroxide spherical particles using a granulator. After cooling and drying, the biochar composite material was obtained.

[0087] S2. Plant the seedlings with soil in the planting hole and backfill the planting hole with filler material, and then carry out routine maintenance. The filler material includes the following raw materials: 50 parts clay and 30 parts wheat straw powder.

[0088] Compared with Example 1, Comparative Example 3 did not involve loading the biochar with ammonium phosphomolybdate.

[0089] In an arid region of Dingxi City, Gansu Province, 100 seedlings of Pinus sylvestris were planted in early April 2023, following the methods of Examples 1-3 and Comparative Examples 1-3. No further fertilization was applied after planting. Watering was carried out twice a month, in early May and early June, with 50 mL of water each time. Watering was continued every two weeks in July, August, and September, with 50 mL of water each time. Watering was stopped once in early October, with 50 mL of water per watering. The tree height (height above ground) was measured in early May 2024, and the average value was calculated. The results are as follows: Figure 1 As shown, from Figure 1 As can be seen from the above, by adopting the planting method in the embodiments of the present invention, the average tree height of Pinus sylvestris is relatively high.

[0090] Finally, it should be noted that the above embodiments do not limit the present invention in any way. Those skilled in the art can make modifications and improvements based on the present invention. Therefore, any modifications or improvements made without departing from the spirit of the present invention are within the scope of protection claimed by the present invention.

Claims

1. A method for planting trees in arid regions, characterized in that, Includes the following steps: S1. Dig planting holes in the natural soil layer. After the planting holes are dug, cover the bottom of the planting holes with a 10-15cm thick soil conditioner. The soil conditioner includes the following raw materials: 40-60 parts fermented cassava residue, 10-15 parts vermiculite powder, 10-20 parts sheep manure, and 15-25 parts biochar composite material. S2. Plant the seedlings with mud in the planting hole and backfill the planting hole with filler material, and then carry out routine maintenance. The filler material includes the following raw materials: 50-60 parts clay and 30-40 parts straw powder. In step S1, the preparation method of the biochar composite material is as follows: (1) Disperse biochar in deionized water, then add phosphate and ammonium molybdate to it, mix well, then add acid solution, stir to react, and after the reaction is complete, filter, wash and dry to obtain biochar / ammonium phosphomolybdate complex; (2) Calcium peroxide and sodium carboxymethyl cellulose are mixed evenly and then granulated by a granulator to obtain calcium peroxide spherical particles. Then, using the calcium peroxide spherical particles as the core, biochar / ammonium phosphomolybdate composite and starch are mixed evenly and then coated on the surface of the calcium peroxide spherical particles by a granulator. After cooling and drying, the biochar composite material is obtained.

2. The planting method according to claim 1, characterized in that, In step (1), the ratio of biochar, phosphate, ammonium molybdate and acid solution is 8-12g: 3-5g: 6-8g: 20-30mL, and the concentration of acid solution is 4-8mol / L.

3. The planting method according to claim 1, characterized in that, In step (1), the stirring reaction time is 6-12 hours.

4. The planting method according to claim 1, characterized in that, In step (2), the mass ratio of calcium peroxide to sodium carboxymethyl cellulose is 5-10:1-2.

5. The planting method according to claim 1, characterized in that, In step (2), the mass ratio of biochar / ammonium phosphomolybdate complex, starch and calcium peroxide spherical particles is 40-60:3-5:10-20.

6. The planting method according to claim 1, characterized in that, In step S1, the diameter of the planting hole is 30-40cm and the depth of the planting hole is 25-30cm.

7. The planting method according to claim 1, characterized in that, In step S1, the preparation method of the fermented cassava residue is as follows: inoculate the dried cassava residue with Lactobacillus plantarum solution, adjust the water content to 60-65% with physiological saline, mix evenly, put it into a polyethylene film bag, use a vacuum pump to extract the air in the bag to a vacuum state, seal it, and place it at room temperature for solid fermentation for 7-10 days. Then, air-dry the fermented material until the water content is 24-28%, and then crush it to 1-2.5mm to obtain fermented cassava residue.

8. The planting method according to claim 7, characterized in that, Based on the mass of cassava residue dry matter, the inoculum size of *Lactobacillus plantarum* culture is 3-5%, and the viable cell count in the culture is 3 × 10⁻⁶. 5 -5×10 5 cfu / mL.

9. The planting method according to claim 1, characterized in that, In step S2, the straw powder is selected from corn straw powder, wheat straw powder or rice straw powder.

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