Method for recovering strong-basicity red gum clay vegetation in northwest arid region by using plants and application

Abstract

The invention discloses a method for recovering strong-basicity red gum clay vegetation in northwest arid regions through plants and application. The method comprises the steps that a proper planting site is selected; soil covering and fertilization are conducted on the planting site, and then a soil conditioner is applied for soil improvement; plants which are drought-resistant, saline-alkaline-resistant, trampling-resistant and high in adaptability are selected for matching and mixed sowing; field management and pest control. According to the method, the strongly basic red gum clay in the northwest arid region is improved by means of plant planting, soil covering, fertilizer applying and soil conditioner applying, hardening is broken, the strongly basic red gum clay is suitable for vegetation growth, and therefore the ecology is restored.

Description

Technical Field

[0001] The invention relates to the technical field of ecological restoration, and in particular to a method and application of restoring vegetation in strongly alkaline red clay in arid areas of northwest China by using plants. Background Art

[0002] Scientific and rational use of climate resources, when building new energy sites such as photovoltaic power generation and wind power generation, only places with low land prices and low utilization rates such as deserts, sandy land, Gobi, saline-alkali land, mines, solid waste storage sites, and ash fields can be selected in the north. How to comprehensively manage the ecology of these areas, while carrying out supporting soil improvement, and restore the agricultural and pastoral and grassland productivity of land resources in new energy sites is an important new research and development topic in agriculture, animal husbandry, forestry, ecology and environmental science today. Reducing atmospheric dust pollution, realizing the ecological and environmental protection and utilization of new energy sites, ecological restoration of new energy sites, and restoring the agricultural and pastoral production capacity of sites are the focus of research. Therefore, it is necessary to propose improvement plans for these areas that are not suitable for vegetation growth. Summary of the invention

[0003] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0004] To this end, the embodiment of the present invention provides a method and application of restoring vegetation on strongly alkaline red clay in the arid region of Northwest China by using plants.

[0005] In a first aspect, the present invention proposes a method for restoring vegetation in highly alkaline red clay soil in arid areas of Northwest China using plants, comprising the following steps:

[0006] (a) Select a suitable planting site;

[0007] (b) first covering the planting site with soil and applying fertilizer, and then applying a soil conditioner to improve the soil;

[0008] (c) Select plants that are drought-resistant, salt-tolerant, trampling-resistant, and highly adaptable for mixed planting;

[0009] (d) Field management and pest control.

[0010] Furthermore, in step (a), the suitable planting site is a strongly alkaline red clay soil with a gentle terrain, flat ground, good ventilation and sunshine, drought and little rain, and a pH value of 8.5 to 8.77.

[0011] Furthermore, in step (b), the soil components of the covering soil include northwestern sandy loam, farmyard manure, rice husks and sawdust in a mass ratio of 4:2:1:1, and the thickness of the covering soil is 13 to 15 cm.

[0012] Furthermore, in step (b), the fertilizer used for fertilization includes trace element chelated fertilizer, medium trace element fertilizer, diammonium phosphate, urea, superphosphate, compound fertilizer potassium sulfate and biological fertilizer in a mass ratio of 1:4:1:1:2:4:4, and the fertilizer application rate is 500-600g / m 2 / Year.

[0013] Furthermore, the soil conditioner comprises mineral potassium humate, high-efficiency water-soluble humic acid, and Junliqing powder in a mass ratio of 10:1:2, and the application amount of the soil conditioner is 300-400 g / m 2 .

[0014] Furthermore, the plants include equal weight ratios of Suaeda salsa, Sophora alopecuroides, Puccinellia tenuifolia, Agropyron sylvestris, Elymus sibiricum and Alfalfa No. 3, with a sowing rate of 41-46 g / m 2 The sowing depth is 1 to 3 cm, there is no spacing between rows and plants, and the seeds are sown evenly.

[0015] Furthermore, the field management includes covering the soil, applying fertilizers and amendments, then watering the soil once; sowing after 1d to 2d, and watering thoroughly after sowing; watering once every 2d to 3d to promote germination and rooting; watering once every 2d to 3d to help the seedlings grow slowly, and watering 3 to 5 times for 18 to 22 days of the seedling growth period, and watering every 15d to 20d after the seedlings grow slowly; watering once for tillering and branching when the seedlings are 14cm to 18cm tall, and then irrigating and watering 1 to 2 times according to the soil moisture conditions, and watering for wintering at the end of October according to weather conditions; watering for greening in mid-February of the second year according to weather conditions, watering every 4 to 5d, for a total of 3 to 4 times, and then applying fertilizer and watering in time according to the seedling conditions and soil moisture conditions; and manually harvesting seeds from mid-August to mid-October when the panicles and pods are light yellow-brown.

[0016] Furthermore, the pest control is to use 800-1000 times diluted Junliqing (low toxicity) to control gray mold, sooty mold, rust, and seedling blight, spraying once a week for two consecutive weeks; use 600-800 times diluted 2.5% highly effective chlorfenapyr (low toxicity) to control locusts, aphids, armyworms, loopers, middle flower beetles, and flower bugs, spraying once a week for two consecutive weeks.

[0017] Furthermore, the nymph population density is greater than 10 heads / m 2 If the lesions are visible to the naked eye, use 400-600 times diluted 2.5% highly effective chlorfenapyr (low toxicity) for prevention and control, spray once a week for three consecutive weeks; if the lesions are visible to the naked eye, use 500-800 times diluted Junliqing (low toxicity) for prevention and control, spray once a week for three consecutive weeks.

[0018] In a second aspect, the present invention proposes the application of the method proposed in the first aspect in the restoration of vegetation on highly alkaline red clay in the arid region of Northwest China.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] The invention improves the strong alkaline red clay in the arid area of ​​northwest China by means of plant planting, soil covering, fertilization and application of soil improver, breaks up the compaction and makes it suitable for vegetation growth, thereby restoring the ecology. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0022] Figure 1 The present invention is a flow chart of a method for restoring vegetation in strongly alkaline red clay soil in arid areas of northwest China by using plants. DETAILED DESCRIPTION

[0023] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0024] The method for restoring vegetation in the strongly alkaline red clay soil in the arid region of Northwest China by using plants is described in detail below with reference to the accompanying drawings.

[0025] like Figure 1 As shown, the method of restoring vegetation in the strongly alkaline red clay soil in the arid region of Northwest China by using plants of the present invention comprises the following steps:

[0026] (a) Select a suitable planting site;

[0027] (b) first covering the planting site with soil and applying fertilizer, and then applying a soil conditioner to improve the soil;

[0028] (c) Select plants that are drought-resistant, salt-tolerant, trampling-resistant, and highly adaptable for mixed planting;

[0029] (d) Field management and pest control.

[0030] Among them, the suitable planting site in step (a) is a strong alkaline red clay with a gentle terrain, flat ground, ventilation and sunshine, drought and little rain, and a pH value of 8.5 to 8.77. Strongly alkaline red clay has soil compaction and increased salinization, which is not suitable for vegetation growth and needs to be improved.

[0031] In step (b), the soil components of the covering soil include northwest sandy loam, farmyard manure, rice husks and sawdust in a mass ratio of 4:2:1:1, and the thickness of the covering soil is 13 to 15 cm.

[0032] Sandy loam refers to soil with a moderate content of clay, silt and sand in its soil particle composition, and the sand content can reach 55%-85%. This soil is loose and has good water permeability and air permeability, but poor water and fertilizer retention capacity. Therefore, it is combined with farmers' decomposed fertilizers to increase fertility, and rice husks and sawdust to increase water retention capacity.

[0033] In step (b), the fertilizer used for fertilization includes trace element chelated fertilizer, medium trace element fertilizer, diammonium phosphate, urea, superphosphate, compound fertilizer potassium sulfate and biological fertilizer in a mass ratio of 1:4:1:1:2:4:4, and the fertilizer application rate is 500-600g / m 2 / year, the application method is broadcasting.

[0034] Among them, trace element chelated fertilizers are fertilizers made of chelating agents and trace elements essential to plants (except boron and molybdenum), such as chelated zinc, chelated iron, chelated manganese, chelated copper, etc.

[0035] Medium and trace element fertilizers refer to organic and inorganic compounds that exist in low concentrations in plants or in the soil and can affect the growth, development and stress resistance of plants, such as sulfur, calcium, magnesium, etc.

[0036] Biofertilizer is a new type of fertilizer biological product that uses the life activities of active microorganisms to provide crops with the nutrients they need. Biofertilizer is a low-carbon, pure natural, non-toxic, harmless, and pollution-free organic microbial agent that has the functions of improving soil fertility, increasing the number and activity of beneficial microorganisms in the soil, improving soil activation properties, and preventing soil compaction; it can also improve the soil's ability to retain fertilizer, water, and cold. Microorganisms rapidly reproduce to form beneficial bacterial communities that enhance crop disease resistance, increase organic matter in the soil, prevent pathogenic bacteria from invading, and reduce the growth of plant diseases and insect pests.

[0037] In step (b), the soil conditioner includes mineral potassium humate, high-efficiency water-soluble humic acid, and Junliqing powder in a mass ratio of 10:1:2, and the application amount of the soil conditioner is 300-400 g / m 2 The application method is broadcasting.

[0038] Among them, mineral humic acid is a water-soluble reddish-brown or gray-black powdery substance that can promote plant growth, plays an important role in drought resistance, can improve plant resistance to stress, and has the effect of increasing production and improving plant quality.

[0039] High-efficiency water-soluble humic acid is a type of organic matter that is created and accumulated from animal and plant remains, mainly plant remains, through the decomposition and transformation of microorganisms and a series of geochemical processes. It has the functions of increasing fertilizer efficiency, improving soil, stimulating crop growth, and improving the quality of agricultural products.

[0040] Junliqing is a comprehensive disease treatment agent that can deal with various fungal, bacterial and viral diseases, and can prevent and treat gray mold, sooty mold, rust, seedling blight, etc.

[0041] Through field investigation, vegetation characteristics, soil testing, analysis, calculation and experiment, it is found that the plants suitable for the strong alkaline red clay in the arid northwest region include equal weight ratios of Suaeda salsa, Sophora alopecuroides, Puccinellia tenuifolia, Agropyron truncatula, Eryngium sibiricum and Alfalfa No. 3, with a sowing rate of 41-46 g / m 2 The sowing depth is 1 to 3 cm, there is no spacing between rows and plants, and the seeds are sown evenly.

[0042] It is planted according to soil conditions and taking advantage of its self-reproduction and strong adaptability. After the seeds mature and fall off, seedlings can be formed in the same year under suitable conditions.

[0043] In step (d), the field management includes covering the soil, applying fertilizers and improvers, and then watering the soil once; sowing after 1d to 2d, and watering once after sowing; watering once every 2d to 3d to promote germination and rooting; watering once every 2d to 3d to slow down the growth of the seedlings, and watering 3 to 5 times for 18 to 22 days of the slow growth period, and watering once every 15d to 20d after the slow growth of the seedlings; when the seedlings are 14cm to 18cm tall, watering once for tillering and branching, and then irrigating and watering 1 to 2 times according to the soil moisture conditions, and irrigating and watering for wintering at the end of October according to weather conditions; in mid-February of the second year, watering for greening, watering every 4 to 5d according to weather conditions, and watering 3 to 4 times in total, and then topdressing and watering are carried out in time according to the seedling conditions and soil moisture conditions; from mid-August to mid-October, the seeds are manually harvested when the panicles and pods are light yellow-brown.

[0044] The pest control is to use 800-1000 times diluted Junliqing (low toxicity) to control gray mold, sooty mold, rust, and seedling blight, spraying once a week for two consecutive weeks; use 600-800 times diluted 2.5% highly effective chlorfenapyr (low toxicity) to control locusts, aphids, armyworms, loopers, middle flower beetles, and flower bugs, spraying once a week for two consecutive weeks.

[0045] The nymph population density is relatively high, greater than 10 / m 2 If the lesions are visible to the naked eye, use 400-600 times diluted 2.5% highly effective chlorfenapyr (low toxicity) for prevention and control, spray once a week for three consecutive weeks; if the lesions are visible to the naked eye, use 500-800 times diluted Junliqing (low toxicity) for prevention and control, spray once a week for three consecutive weeks.

[0046] The present invention is described below in conjunction with specific embodiments.

[0047] Example 1

[0048] A planting site with gentle terrain, flat ground, good ventilation and sunshine was selected, and the planting area was demarcated. The average pH value of 10 soil samples tested was 8.63, and the average contents of hydrolyzable nitrogen, available phosphorus and fast-acting potassium were 7.17 mg / Kg, 1.65 mg / Kg and 34.66 mg / Kg respectively.

[0049] The planting area was covered with Northwest sandy loam, farmyard manure, rice husks and sawdust in a mass ratio of 4:2:1:1, with a covering thickness of 13 cm; the planting area was spread with trace element chelated fertilizer, medium and trace element fertilizer, diammonium phosphate, urea, superphosphate, compound fertilizer potassium sulfate and biological bacterial fertilizer in a mass ratio of 1:4:1:1:2:4:4, with a fertilizer application rate of 500 g / m 2 / year, apply mineral potassium humate, high-efficiency water-soluble humic acid, and Junliqing powder in a mass ratio of 10:1:2 in the planting area, and the application rate of soil conditioner is 300g / m 2 .

[0050] After covering the soil, applying fertilizer and amendment, water the soil once. One day later, mix the weight ratio of Suaeda salsa, Sophora alopecuroides, Puccinellia tenuifolia, Agropyron sylvestris, Elymus sibiricum, and Alfalfa No. 3 with the plant seeding rate of 41g / m 2 The sowing depth is 2cm, there is no spacing between rows and plants, and the seeds are sown evenly.

[0051] Water thoroughly after sowing; water once every 2 days to promote germination and root growth; water once every 3 days to help the seedlings grow slowly, water 3 times for 18 days, and water every 15 days after the seedlings grow slowly; when the seedlings are 14cm to 18cm tall, water once to help them grow slowly and branch, then irrigate and water 1 to 2 times depending on the soil moisture conditions, and at the end of October, water for wintering depending on weather conditions; in mid-February of the second year, water the plants for greening up depending on weather conditions, water every 4 days for a total of 3 times, and then apply fertilizer and water in time depending on the seedling condition and soil moisture conditions.

[0052] When pests and diseases occur during the growth of seedlings, use 800 times diluted Junliqing to control gray mold, sooty mold, rust, and seedling blight, spray once a week for two consecutive weeks; use 600 times diluted 2.5% highly effective chlorfenapyr to control locusts, aphids, armyworms, loopers, middle flower beetles, and flower fly, spray once a week for two consecutive weeks. The nymph population density is high, greater than 10 heads / m 2 If the lesions are visible to the naked eye, use 400 times diluted 2.5% highly effective chlorfenapyr solution for prevention and control, spray once a week for three consecutive weeks; if the lesions are visible to the naked eye, use 500 times diluted Junliqing solution for prevention and control, spray once a week for three consecutive weeks.

[0053] From mid-August to mid-October, seeds are harvested manually when the pods turn light yellow-brown. The harvested seeds are tested for pests and kept as seeds. In the greening season of the second year, the soil is fertilized and the scattered bald spots that have not turned green are improved and replanted. Maintenance continues for 5 years.

[0054] Example 2

[0055] A planting site with gentle terrain, flat ground, good ventilation and sunshine was selected, and the planting area was demarcated. The average pH value of 10 soil samples tested was 8.75, and the average contents of hydrolyzable nitrogen, available phosphorus and fast-acting potassium were 9.67 mg / Kg, 15.70 mg / Kg and 64.33 mg / Kg respectively.

[0056] The planting area was covered with Northwest sandy loam, farmyard manure, rice husks and sawdust in a mass ratio of 4:2:1:1, with a covering thickness of 14 cm; the planting area was spread with trace element chelated fertilizer, medium and trace element fertilizer, diammonium phosphate, urea, superphosphate, compound fertilizer potassium sulfate and biological bacterial fertilizer in a mass ratio of 1:4:1:1:2:4:4, with a fertilizer application rate of 540 g / m 2 / year, apply mineral potassium humate, high-efficiency water-soluble humic acid, and Junliqing powder in a mass ratio of 10:1:2 in the planting area, and the application rate of soil conditioner is 340g / m 2 .

[0057] After covering the soil, applying fertilizer and amendment, water the soil once. One day later, mix the weight ratio of Suaeda salsa, Sophora alopecuroides, Puccinellia tenuifolia, Agropyron sylvestris, Elymus sibiricum, and Alfalfa No. 3 with the plant seeding rate of 44g / m 2 The sowing depth is 2cm, there is no spacing between rows and plants, and the seeds are sown evenly.

[0058] Water thoroughly after sowing; water once every 2 days to promote germination and root growth; water once every 3 days to help the seedlings grow slowly, water 3 times for 18 days, and water every 15 days after the seedlings grow slowly; when the seedlings are 14cm to 18cm tall, water once to help them grow slowly and branch, then irrigate and water 1 to 2 times depending on the soil moisture conditions, and at the end of October, water for wintering depending on weather conditions; in mid-February of the second year, water the plants for greening up depending on weather conditions, water every 4 days for a total of 3 times, and then apply fertilizer and water in time depending on the seedling condition and soil moisture conditions.

[0059] When pests and diseases occur during the growth of seedlings, use 800 times diluted Junliqing to control gray mold, sooty mold, rust, and seedling blight, spray once a week for two consecutive weeks; use 600 times diluted 2.5% highly effective chlorfenapyr to control locusts, aphids, armyworms, loopers, middle flower beetles, and flower fly, spray once a week for two consecutive weeks. The nymph population density is high, greater than 10 heads / m 2If the lesions are visible to the naked eye, use 400 times diluted 2.5% highly effective chlorfenapyr solution for prevention and control, spray once a week for three consecutive weeks; if the lesions are visible to the naked eye, use 500 times diluted Junliqing solution for prevention and control, spray once a week for three consecutive weeks.

[0060] From mid-August to mid-October, seeds are harvested manually when the pods turn light yellow-brown. The harvested seeds are tested for pests and kept as seeds. In the greening season of the second year, the soil is fertilized and the scattered bald spots that have not turned green are improved and replanted. Maintenance continues for 5 years.

[0061] Example 3

[0062] A planting site with gentle terrain, flat ground, good ventilation and sunshine was selected, and the planting area was demarcated. The average pH value of 10 soil samples tested was 8.59, and the average contents of hydrolyzable nitrogen, available phosphorus and fast-acting potassium were 9.38 mg / Kg, 14.36 mg / Kg and 80.81 mg / Kg respectively.

[0063] The planting area was covered with Northwest sandy loam, farmyard manure, rice husks and sawdust in a mass ratio of 4:2:1:1, with a covering thickness of 15 cm; the planting area was spread with trace element chelated fertilizer, medium and trace element fertilizer, diammonium phosphate, urea, superphosphate, compound fertilizer potassium sulfate and biological bacterial fertilizer in a mass ratio of 1:4:1:1:2:4:4, with a fertilizer application rate of 600 g / m 2 / year, apply mineral potassium humate, high-efficiency water-soluble humic acid, and Junliqing powder in a mass ratio of 10:1:2 in the planting area, and the application rate of soil conditioner is 400g / m 2 .

[0064] After covering the soil, applying fertilizer and amendment, water the soil once. One day later, mix the weight ratio of Suaeda salsa, Sophora alopecuroides, Puccinellia tenuifolia, Agropyron sylvestris, Elymus sibiricum, and Alfalfa No. 3 with the plant seeding rate of 46g / m 2 The sowing depth is 2cm, there is no spacing between rows and plants, and the seeds are sown evenly.

[0065] Water thoroughly after sowing; water once every 2 days to promote germination and root growth; water once every 3 days to help the seedlings grow slowly, water 3 times for 18 days, and water every 15 days after the seedlings grow slowly; when the seedlings are 14cm to 18cm tall, water once to help them grow slowly and branch, then irrigate and water 1 to 2 times depending on the soil moisture conditions, and at the end of October, water for wintering depending on weather conditions; in mid-February of the second year, water the plants for greening up depending on weather conditions, water every 4 days for a total of 3 times, and then apply fertilizer and water in time depending on the seedling condition and soil moisture conditions.

[0066] When pests and diseases occur during the growth of seedlings, use 1000 times diluted Junliqing to control gray mold, sooty mold, rust, and seedling blight, spray once a week for two consecutive weeks; use 800 times diluted 2.5% highly effective chlorfenapyr to control locusts, aphids, armyworms, loopers, middle flower beetles, and flower fly, spray once a week for two consecutive weeks. The nymph population density is high, greater than 10 heads / m 2 If the lesions are visible to the naked eye, use 400 times diluted 2.5% highly effective chlorfenapyr solution for prevention and control, spray once a week for three consecutive weeks; if the lesions are visible to the naked eye, use 600 times diluted Junliqing solution for prevention and control, spray once a week for three consecutive weeks.

[0067] From mid-August to mid-October, seeds are harvested manually when the pods turn light yellow-brown. The harvested seeds are tested for pests and kept as seeds. In the greening season of the second year, the soil is fertilized and the scattered bald spots that have not turned green are improved and replanted. Maintenance continues for 5 years.

[0068] Test Example 1

[0069] Five years after planting and harvesting, the soil pH value and the contents of hydrolyzable nitrogen, available phosphorus and available potassium were tested (10 samples were taken to calculate the average value). The test results are shown in Table 1 below.

[0070] Table 1:

[0071] Grouping pH Hydrolyzable nitrogen (mg / Kg) Available phosphorus (mg / Kg) Fast-acting potassium (mg / Kg) Example 1 7.48 150.12 22.84 260.11 Example 2 7.74 134.50 17.86 240.80 Example 3 7.84 116.78 19.22 213.47

[0072] According to Table 1, after 5 planting and harvesting, the pH value of the soil of Examples 1 to 3 decreased, and the hydrolyzable nitrogen, available phosphorus, and available potassium contents increased compared with the previous ones, reaching a certain content suitable for the growth of vegetation. It can be seen that the method of the present invention has a good effect on improving the strong alkaline red clay. Especially the effect of Example 1, the soil pH value was improved from strong alkaline 8.63 to neutral 7.48, the hydrolyzable nitrogen content in the soil was improved from extremely low level 6 to high content level 1, the available phosphorus content was improved from extremely low level 6 to high content level 2, and the available potassium content was improved from low level 5 to extremely high content level 1. This technical method improves the strong alkaline red clay into a soil strip suitable for the growth of most plants, and is also fully capable of agricultural and animal husbandry production.

[0073] Test Example 2

[0074] The perennial plants planted in Example 1 were observed for 5 consecutive years, and the greening rate, plant height at maturity, and root penetration depth at maturity were tested in each greening season. The test results are shown in Table 2 below. Among them, the greening rate, plant height at maturity, and root penetration depth at maturity are all average values ​​within a certain area.

[0075] Table 2:

[0076] Bitter beans Puccinellia tenuifolia Agropyron flatulum Old wheat Grassland No. 3 Alfalfa Second year greening rate (%) 81 96 78 93 96 The third year green rate (%) 100 100 100 100 100 Fourth year greening rate (%) 100 100 100 100 100 Greening rate in the fifth year (%) 100 100 100 100 100 Average plant height in the first year (cm) 15 16 26 24 28 Average plant height in the second year (cm) 36 43 58 61 56 Average plant height in the third year (cm) 48 44 63 66 64 Average plant height in the fourth year (cm) 49 48 66 70 68 Average plant height in the fifth year (cm) 52 51 67 74 68 Average root depth in the soil in the first year (cm) 18 18 24 31 26 Average root depth in the second year (cm) 25 34 35 42 58 Average root depth in the third year (cm) 26 34 38 45 87 Average root depth in the fourth year (cm) 63 37 41 46 118 Average root depth in the fifth year (cm) 79 38 42 47 156

[0077] According to Table 2, the greening rate, plant height, and root depth of perennial plants have been increasing year by year. After soil improvement, the soil is suitable for the growth of these vegetation. Through the development of the root system and the growth of the plants, a large and dense root network and biomass are formed, and a stable soil cortex and humus layer are formed between 0 and 18 cm on the surface of the soil, which effectively provides rich nutrition for plants, prevents soil erosion, and plays a role in preventing wind and sand. At the same time, the horizontal growth of the root system reaches a maximum depth of 156 cm, breaking the solid soil structure in the deep layer and achieving deep improvement of the strong alkaline red clay.

[0078] Test Example 3

[0079] The plants planted in Example 1, Example 2, and Example 3 were observed for 5 consecutive years, and the number of column clusters of the vegetation was tested during the stable growth period. The test results are shown in Table 3 below.

[0080] Table 3:

[0081]

[0082]

[0083] According to Table 3, the number of plants planted in Example 1, Example 2, and Example 3 gradually increased, and the strongly alkaline red clay was gradually suitable for the growth of vegetation after being improved. At the same time, it created a soil environment for the good growth of other plants, thereby improving the diversity of plants.

[0084] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms may be for different embodiments or examples. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0085] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0086] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A method for restoring vegetation in strongly alkaline red clay soil in arid areas of Northwest China using plants, characterized in that: The following steps are involved: (a) Select a suitable planting site; (b) first covering the planting site with soil and applying fertilizer, and then applying a soil conditioner to improve the soil; (c) Select plants that are drought-resistant, salt-tolerant, trampling-resistant, and highly adaptable for mixed planting; (d) Field management and pest control.

2. The method according to claim 1, characterized in that In step (a), the suitable planting site is a strongly alkaline red clay soil with a gentle terrain, flat ground, ventilation, sunshine, drought and little rain, and a pH value of 8.5 to 8.

77.

3. The method according to claim 1, characterized in that In step (b), the soil components of the covering soil include northwest sandy loam, farmyard manure, rice husks and sawdust in a mass ratio of 4:2:1:1, and the thickness of the covering soil is 13 to 15 cm.

4. The method according to claim 1, characterized in that In step (b), the fertilizer used for fertilization includes trace element chelated fertilizer, medium trace element fertilizer, diammonium phosphate, urea, superphosphate, compound fertilizer potassium sulfate and biological fertilizer in a mass ratio of 1:4:1:1:2:4:4, and the fertilizer application rate is 500-600g / m 2 / Year.

5. The method according to claim 1, characterized in that In step (b), the soil conditioner includes mineral potassium humate, high-efficiency water-soluble humic acid, and Junliqing powder in a mass ratio of 10:1:2, and the application amount of the soil conditioner is 300-400 g / m 2 .

6. The method according to claim 1, characterized in that The plants include Suaeda salsa, Sophora alopecuroides, Puccinellia tenuifolia, Agropyron sylvestris, Elymus sibiricum and Grassland No. 3 miscellaneous alfalfa in equal weight ratio, and the sowing amount is 41-46 g / m 2 The sowing depth is 1 to 3 cm.

7. The method according to claim 1, characterized in that The field management is as follows: covering the soil, applying fertilizers and amendments, then watering once; sowing after 1d to 2d, and watering thoroughly after sowing; watering once every 2d to 3d to promote germination and rooting; watering once every 2d to 3d to accelerate seedling growth, and watering 3 to 5 times for 18 to 22 days of seedling growth, and watering every 15d to 20d after seedling growth; when the seedlings are 14cm to 18cm tall, watering for tillering and branching, and then irrigating and watering 1 to 2 times according to the soil moisture conditions, and at the end of October, watering for wintering according to weather conditions; in mid-February of the second year, watering for greening according to weather conditions, watering every 4 to 5d, for a total of 3 to 4 times, and then applying fertilizer and watering in time according to the seedling condition and soil moisture conditions; from mid-August to mid-October, seeds are harvested manually when the panicles and pods are light yellow-brown.

8. The method according to claim 7, characterized in that The pest control is to use 800-1000 times diluted Junliqing to control gray mold, sooty mold, rust, and seedling blight, spraying once a week for two consecutive weeks; use 600-800 times diluted 2.5% highly effective chlorfenapyr to control locusts, aphids, armyworms, loopers, middle flower beetles, and flower bugs, spraying once a week for two consecutive weeks.

9. The method according to claim 8, characterized in that The nymph population density is greater than 10 / m 2 If the lesions are visible to the naked eye, use 400-600 times diluted 2.5% highly effective chlorfenapyr for prevention and control, spray once a week for three weeks; if the lesions are visible to the naked eye, use 500-800 times diluted Junliqing for prevention and control, spray once a week for three weeks.

10. Use of the method according to any one of claims 1 to 9 in the restoration of vegetation on strongly alkaline red clay in the arid areas of northwest China.

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