Method for vegetation restoration in high-altitude permafrost engineering disturbance area
By adjusting the layers and mesh size of the cover net according to the ground temperature in the permafrost engineering disturbance zone at high altitudes, the problem of vegetation restoration was solved, and the germination rate of grass seeds and the growth height of grass seedlings were significantly improved, thus promoting the rapid restoration of vegetation.
Patent Information
- Application Number
- CN202411796767.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-09
- Publication Date
- 2026-02-24
- Estimated Expiration
- 2044-12-09
AI Technical Summary
The challenge of vegetation restoration in high-altitude permafrost engineering disturbance areas is particularly evident after soil removal or damage, which reduces soil nutrient content and water retention capacity, making vegetation restoration difficult.
In the permafrost disturbance zone, turn over the soil and sow seeds of Leymus chinensis, and cover the soil with a multi-layered covering net. Adjust the layers and mesh size of the covering net according to the soil temperature to ensure a suitable environment for seed germination and seedling growth.
It improved the germination rate of grass seeds and the growth height of grass seedlings, and promoted the rapid recovery of vegetation in the permafrost engineering disturbance area at high altitude.
Smart Images
Figure CN119344168B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of vegetation restoration technology. More specifically, this invention relates to a method for vegetation restoration in high-altitude permafrost engineering disturbance zones. Background Technology
[0002] The Qinghai-Tibet Plateau is the main distribution area of high-altitude permafrost, with a permafrost area of 1.5 million square kilometers. The Qinghai-Tibet Plateau has a harsh climate with low average annual temperature, strong seasonal freeze-thaw action, strong solar radiation, high wind speed, and evaporation far exceeding precipitation. The harsh climate makes the plateau's ecological environment very fragile.
[0003] The uniqueness, pristine nature, and fragility of alpine vegetation ecosystems pose significant challenges to the restoration and maintenance of surface vegetation after human disturbance. Especially after engineering construction disturbances, the topsoil is often removed or damaged, leading to a substantial decrease in soil nutrient content and water-holding capacity. Therefore, vegetation restoration in alpine permafrost regions remains a challenging ecological restoration process during engineering construction. Summary of the Invention
[0004] This invention provides a method for vegetation restoration in permafrost engineering disturbance zones at high altitudes, comprising the following steps:
[0005] S1. When the frozen soil disturbance area meets the sowing time period, turn the soil and re-sow Leymus chinensis seeds. The sowing time period is 3 to 10 days after the deadline when the daily average ground temperature at a depth of 0 cm in the frozen soil disturbance area is not less than the first preset temperature value for 10 consecutive days and the daily average ground temperature at a depth of 50 to 60 cm in the frozen soil disturbance area is not less than the second preset temperature value for 12 consecutive days.
[0006] S2. Cover with multiple layers of cover netting until the daily average ground temperature at a depth of 0 cm in the permafrost disturbance zone is not less than the third preset temperature value for 8 consecutive days. Then remove part of the cover netting and keep only one layer of cover netting.
[0007] S3. When the grass seedlings grow to a height of 5-8 cm, remove the last layer of covering netting.
[0008] Preferably, the first preset temperature is 10°C, the second preset temperature is 8°C, and the third preset temperature is 12°C.
[0009] Preferably, the method for calculating the daily average ground temperature at a depth of 0 cm in the permafrost disturbance zone specifically includes the following operations:
[0010] The ground temperature at 0 cm in the permafrost disturbance zone was measured multiple times a day, and the average value was taken. The time interval between two consecutive ground temperature measurements was at least 4 hours.
[0011] The method for calculating the daily average ground temperature at a depth of 50–60 cm in the permafrost disturbance zone specifically includes the following steps:
[0012] The ground temperature at a depth of 50-60 cm in the permafrost disturbance area was measured multiple times a day, and the average value was taken. The interval between two consecutive ground temperature measurements was at least 4 hours.
[0013] Preferably, the method further includes spreading organic matter on the soil surface of the permafrost disturbance area after tilling and before reseeding with grass seeds, wherein the organic matter includes at least peat or sawdust.
[0014] Preferably, the sowing rate of the grass seeds is 1~2.5 kg / mu.
[0015] Preferably, it also includes applying nitrogen fertilizer after reseeding the grass seeds, with the amount of nitrogen fertilizer applied per acre being 2 to 3 times the amount of grass seeds sown.
[0016] Preferably, the covering net is a dense green net, and the mesh size of the covering net includes any one or more of 800 mesh, 1000 mesh, 1500 mesh, and 2000 mesh;
[0017] Wherein, when the amount of grass seed sown is less than or equal to 2 kg / mu, the mesh size of the covering net is 1500 mesh or 2000 mesh;
[0018] When the amount of grass seed sown is greater than 2 kg / mu, the mesh size of the covering net is 800 mesh or 1000 mesh.
[0019] The present invention has at least the following beneficial effects:
[0020] First, by limiting the daily average ground temperature at a depth of 0 cm in the permafrost disturbance zone for 10 consecutive days and the daily average ground temperature at a depth of 50-60 cm in the permafrost disturbance zone for 12 consecutive days, this invention can maintain a suitable temperature in the soil of the permafrost disturbance zone. This helps to keep the endosperm cells inside the seeds active, promotes cell division and growth within the seeds, and avoids the problem of low temperatures and large diurnal temperature differences in high-altitude areas affecting seed embryo development. This helps to increase the germination rate of grass seeds, and the germinated seeds can better absorb nutrients from the soil in the permafrost disturbance zone and grow.
[0021] Secondly, by limiting the daily average ground temperature value at a depth of 0 cm in the permafrost disturbance zone for 8 consecutive days and the third preset temperature value, this invention can ensure that the upper layer of dense green netting is removed in time after the embryo grows from the seed, while retaining a layer of dense green netting. This is conducive to the seedling growing towards the soil surface, unfolding its leaves for photosynthesis, and helps the vegetation in the permafrost engineering disturbance zone at high altitudes to recover quickly.
[0022] Other advantages, objectives and features of the present invention will become apparent in part from the following description, and in part from those skilled in the art through study and practice of the invention. Attached Figure Description
[0023] Figure 1 A photograph of soil turning operation, which is one of the technical solutions of the present invention;
[0024] Figure 2 A photograph of a coverage net, representing one of the technical solutions of the present invention.
[0025] Figure 3 This is a photograph taken 30 days after sowing, according to Embodiment 1 of one of the technical solutions of the present invention. Detailed Implementation
[0026] The present invention will be further described in detail below with reference to embodiments, so that those skilled in the art can implement it based on the description.
[0027] It should be noted that, unless otherwise specified, the experimental methods described in the following implementation plan are all conventional methods, and the reagents and materials described are all commercially available unless otherwise specified.
[0028] The permafrost disturbance zone is located in the heart of the Qinghai-Tibet Plateau, on the first terrace on the right bank of the Tuotuo River. It is under the control of the upper-level westerly wind belt, with a dry and cold climate, frequent winds and little rain, and changeable weather. The temperature is low all year round. The permafrost disturbance zone has a wide and flat terrain, with mounds, marshes, streams and water beaches interspersed. Under natural conditions, the surface vegetation consists of alpine mosses and lichens, with an overall vegetation coverage of 10-40%, which is sparse.
[0029] The freezing period in permafrost disturbance zones typically lasts from around October to around May of the following year. Based on years of investigation into the freezing and daily average ground temperature values in permafrost disturbance zones, this invention began recording the initial freezing time, thawing time, and corresponding daily average ground temperature values in 2022. The following examples and comparative experiments were completed in 2023. The initial freezing time, thawing time, and daily average ground temperature values at key points recorded starting in 2022 are shown below:
[0030] The initial freezing time at a depth of 0 cm in the permafrost disturbance zone was October 20, 2022; the initial thawing time was April 1, 2023; and the complete thawing time was April 4, 2023, with a freezing period lasting 164 days.
[0031] The initial freezing time at a depth of 50 cm in the permafrost disturbance zone was October 30, 2022; the initial thawing time was April 4, 2022; and the complete thawing time was April 7, 2023, with a freezing period lasting 157 days.
[0032] The deadline for ensuring that the daily average ground temperature at a depth of 0 cm in the permafrost disturbance zone is not less than the first preset temperature value for 10 consecutive days and the daily average ground temperature at a depth of 50-60 cm in the permafrost disturbance zone is not less than the second preset temperature value for 12 consecutive days is July 7, 2023. The starting time for ensuring that the daily average ground temperature at a depth of 0 cm in the permafrost disturbance zone is greater than or equal to the third preset temperature (12℃) for 8 consecutive days is July 16, 2023.
[0033] Winged Leymus chinensis exhibits excellent cold resistance, enabling it to survive in low-temperature environments and withstand the frigid climate of high-altitude regions. It also adapts to the strong ultraviolet radiation and large diurnal temperature variations characteristic of high-altitude environments. Furthermore, it demonstrates good salt and alkali tolerance, absorbing sufficient nutrients and water from the high-altitude soil to sustain its growth. Its well-developed root system effectively holds the soil in place, reducing soil erosion, which is crucial for the stability and restoration of the high-altitude ecosystem.
[0034] The reseeding areas in the following examples and comparative examples are all located in permafrost disturbance zones. Except for the different vegetation restoration methods, the conditions in each reseeding area are the same.
[0035] <Example 1>
[0036] Vegetation restoration methods in high-altitude permafrost engineering disturbance zones include the following steps:
[0037] S1. After the frozen soil disturbance area at a depth of 0-50 cm has completely thawed, when it meets the sowing time period, turn the soil, spread peat debris on the soil surface of the frozen soil disturbance area, sow the seeds of *Leymus chinensis* at a rate of 1 kg / mu on July 10, 2023, and apply nitrogen fertilizer including urea at an application rate of 2 kg / mu. The sowing time period is 3 days after the deadline when the daily average soil temperature at a depth of 0 cm in the frozen soil disturbance area is not less than the first preset temperature value (10℃) for 10 consecutive days and the daily average soil temperature at a depth of 50 cm in the frozen soil disturbance area is not less than the second preset temperature value (8℃) for 12 consecutive days.
[0038] S2. Cover with a double-layer covering net until the daily average ground temperature at a depth of 0 cm in the permafrost disturbance zone is not less than the third preset temperature value (12℃) for 8 consecutive days (July 16, 2023). Remove part of the covering net, leaving only one layer of covering net. The covering net is a dense green net with a mesh size of 1500 mesh.
[0039] S3. When the grass seedlings grow to 5 cm in height, remove the last layer of covering netting.
[0040] The method for calculating the daily average ground temperature at a depth of 0 cm in the permafrost disturbance zone specifically includes the following steps:
[0041] The ground temperature at 0 cm in the permafrost disturbance zone was measured multiple times a day, and the average value was taken. The time interval between two consecutive ground temperature measurements was 4 hours.
[0042] The method for calculating the daily average ground temperature at a depth of 50 cm in the permafrost disturbance zone specifically includes the following steps:
[0043] The ground temperature at a depth of 50 cm in the permafrost disturbance zone was measured multiple times a day, and the average value was taken. The time interval between two consecutive ground temperature measurements was 4 hours.
[0044] <Example 2>
[0045] Vegetation restoration methods in high-altitude permafrost engineering disturbance zones include the following steps:
[0046] S1. After the frozen soil disturbance area at a depth of 0-50 cm has completely thawed, when it meets the sowing time period, turn the soil, spread peat debris on the soil surface of the frozen soil disturbance area, sow Leech Seeds at a rate of 2 kg / mu on July 13, 2023, and apply nitrogen fertilizer including urea at an application rate of 6 kg / mu. The sowing time period is 6 days after the deadline when the daily average soil temperature at a depth of 0 cm in the frozen soil disturbance area is not less than the first preset temperature value (10℃) for 10 consecutive days and the daily average soil temperature at a depth of 50 cm in the frozen soil disturbance area is not less than the second preset temperature value (8℃) for 12 consecutive days.
[0047] S2. Cover with a double-layer covering net until the daily average ground temperature at a depth of 0 cm in the permafrost disturbance zone is not less than the third preset temperature value (12℃) for 8 consecutive days (July 16, 2023). Remove part of the covering net, leaving only one layer of covering net. The covering net is a dense green net with a mesh size of 2000 mesh.
[0048] S3. When the grass seedlings grow to 5 cm in height, remove the last layer of covering netting.
[0049] The method for calculating the daily average ground temperature at a depth of 0 cm in the permafrost disturbance zone specifically includes the following steps:
[0050] The ground temperature at 0 cm in the permafrost disturbance zone was measured multiple times a day, and the average value was taken. The time interval between two consecutive ground temperature measurements was 4 hours.
[0051] The method for calculating the daily average ground temperature at a depth of 50 cm in the permafrost disturbance zone specifically includes the following steps:
[0052] The ground temperature at a depth of 50 cm in the permafrost disturbance zone was measured multiple times a day, and the average value was taken. The time interval between two consecutive ground temperature measurements was 4 hours.
[0053] <Example 3>
[0054] Vegetation restoration methods in high-altitude permafrost engineering disturbance zones include the following steps:
[0055] S1. After the frozen soil disturbance area at a depth of 0-50 cm has completely thawed, when it meets the sowing time period, turn the soil, spread peat debris on the soil surface of the frozen soil disturbance area, sow the seeds of *Leymus chinensis* at a sowing rate of 2.5 kg / mu on July 16, 2023, and apply nitrogen fertilizer including urea at an application rate of 5 kg / mu. The sowing time period is 9 days after the deadline when the daily average soil temperature at a depth of 0 cm in the frozen soil disturbance area is not less than the first preset temperature value (10℃) for 10 consecutive days and the daily average soil temperature at a depth of 50 cm in the frozen soil disturbance area is not less than the second preset temperature value (8℃) for 12 consecutive days.
[0056] S2. Cover with a double-layer covering net until the daily average ground temperature at a depth of 0 cm in the permafrost disturbance zone is not less than the third preset temperature value (12℃) for 8 consecutive days (July 16, 2023). Remove part of the covering net, leaving only one layer of covering net. The covering net is a dense green net with a mesh size of 800 mesh.
[0057] S3. When the grass seedlings grow to 8 cm in height, remove the last layer of covering netting.
[0058] The method for calculating the daily average ground temperature at a depth of 0 cm in the permafrost disturbance zone specifically includes the following steps:
[0059] The ground temperature at 0 cm in the permafrost disturbance zone was measured multiple times a day, and the average value was taken. The time interval between two consecutive ground temperature measurements was 4 hours.
[0060] The method for calculating the daily average ground temperature at a depth of 50 cm in the permafrost disturbance zone specifically includes the following steps:
[0061] The ground temperature at a depth of 50 cm in the permafrost disturbance zone was measured multiple times a day, and the average value was taken. The time interval between two consecutive ground temperature measurements was 4 hours.
[0062] <Control Group>
[0063] For patchy bare land (the surface of the permafrost engineering disturbance area is distributed in discontinuous patches, with dense vegetation inside the patches and bare land without vegetation around them), on May 25, 2023, after the surface soil was loosened by using a rake, organic matter including peat debris and sawdust was spread on the surface, and then Winged Leymus chinensis seeds were sown at a seeding rate of 2 kg / mu.
[0064] <Comparative Example 1>
[0065] Vegetation restoration methods in high-altitude permafrost engineering disturbance zones include the following steps:
[0066] S1. After the frozen soil disturbance area at a depth of 0-50 cm has completely thawed, turn the soil over, spread peat debris on the soil surface of the frozen soil disturbance area, and on July 4, 2023 (3 days before the end date of the sowing period), re-sow Leymus chinensis seeds at a sowing rate of 2.5 kg / mu, and apply nitrogen fertilizer including urea at an application rate of 5 kg / mu. The sowing period is 3-10 days after the end date when the daily average soil temperature at a depth of 0 cm in the frozen soil disturbance area is not less than the first preset temperature value (10℃) for 10 consecutive days and the daily average soil temperature at a depth of 50 cm in the frozen soil disturbance area is not less than the second preset temperature value (8℃) for 12 consecutive days.
[0067] S2. Cover with a double-layer covering net until the daily average ground temperature at a depth of 0 cm in the permafrost disturbance zone is not less than the third preset temperature value (12℃) for 8 consecutive days (July 16, 2023). Remove part of the covering net, leaving only one layer of covering net. The covering net is a dense green net with a mesh size of 800 mesh.
[0068] S3. When the grass seedlings grow to 8 cm in height, remove the last layer of covering netting.
[0069] The method for calculating the daily average ground temperature at a depth of 0 cm in the permafrost disturbance zone specifically includes the following steps:
[0070] The ground temperature at 0 cm in the permafrost disturbance zone was measured multiple times a day, and the average value was taken. The time interval between two consecutive ground temperature measurements was 4 hours.
[0071] The method for calculating the daily average ground temperature at a depth of 50 cm in the permafrost disturbance zone specifically includes the following steps:
[0072] The ground temperature at a depth of 50 cm in the permafrost disturbance zone was measured multiple times a day, and the average value was taken. The time interval between two consecutive ground temperature measurements was 4 hours.
[0073] <Comparative Example 2>
[0074] Vegetation restoration methods in high-altitude permafrost engineering disturbance zones include the following steps:
[0075] S1. After the frozen soil disturbance area at a depth of 0-50 cm has completely thawed, turn the soil over, spread peat debris on the soil surface of the frozen soil disturbance area, and on July 7, 2023 (the day of the end of the sowing period), re-sow Leymus chinensis seeds at a sowing rate of 2.5 kg / mu, and apply nitrogen fertilizer including urea at an application rate of 5 kg / mu. The sowing period is 3-10 days after the end date when the daily average soil temperature at a depth of 0 cm in the frozen soil disturbance area is not less than the first preset temperature value (10℃) for 10 consecutive days and the daily average soil temperature at a depth of 50 cm in the frozen soil disturbance area is not less than the second preset temperature value (8℃) for 12 consecutive days.
[0076] S2. Cover with a double-layer covering net until the daily average ground temperature at a depth of 0 cm in the permafrost disturbance zone is not less than the third preset temperature value (12℃) for 8 consecutive days (July 16, 2023). Remove part of the covering net, leaving only one layer of covering net. The covering net is a dense green net with a mesh size of 800 mesh.
[0077] S3. When the grass seedlings grow to 8 cm in height, remove the last layer of covering netting.
[0078] The method for calculating the daily average ground temperature at a depth of 0 cm in the permafrost disturbance zone specifically includes the following steps:
[0079] The ground temperature at 0 cm in the permafrost disturbance zone was measured multiple times a day, and the average value was taken. The time interval between two consecutive ground temperature measurements was 4 hours.
[0080] The method for calculating the daily average ground temperature at a depth of 50 cm in the permafrost disturbance zone specifically includes the following steps:
[0081] The ground temperature at a depth of 50 cm in the permafrost disturbance zone was measured multiple times a day, and the average value was taken. The time interval between two consecutive ground temperature measurements was 4 hours.
[0082] <Comparative Example 3>
[0083] Vegetation restoration methods in high-altitude permafrost engineering disturbance zones include the following steps:
[0084] S1. After the frozen soil disturbance area at a depth of 0-50 cm has completely thawed, when it meets the sowing time period, turn the soil, spread peat debris on the soil surface of the frozen soil disturbance area, sow Leech Seeds at a rate of 2 kg / mu on July 13, 2023, and apply nitrogen fertilizer including urea at an application rate of 6 kg / mu. The sowing time period is 6 days after the deadline when the daily average soil temperature at a depth of 0 cm in the frozen soil disturbance area is not less than the first preset temperature value (10℃) for 10 consecutive days and the daily average soil temperature at a depth of 50 cm in the frozen soil disturbance area is not less than the second preset temperature value (8℃) for 12 consecutive days.
[0085] S2. When the daily average ground temperature at a depth of 0 cm in the permafrost disturbance zone is not less than the third preset temperature value (12℃) for 8 consecutive days (July 16, 2023), cover the area with a layer of covering netting. The covering netting is a dense green netting with a mesh size of 2000 mesh.
[0086] S3. When the grass seedlings grow to a height of 5 cm, remove the covering net.
[0087] The method for calculating the daily average ground temperature at a depth of 0 cm in the permafrost disturbance zone specifically includes the following steps:
[0088] The ground temperature at 0 cm in the permafrost disturbance zone was measured multiple times a day, and the average value was taken. The time interval between two consecutive ground temperature measurements was 4 hours.
[0089] The method for calculating the daily average ground temperature at a depth of 50 cm in the permafrost disturbance zone specifically includes the following steps:
[0090] The ground temperature at a depth of 50 cm in the permafrost disturbance zone was measured multiple times a day, and the average value was taken. The time interval between two consecutive ground temperature measurements was 4 hours.
[0091] <Comparative Example 4>
[0092] Vegetation restoration methods in high-altitude permafrost engineering disturbance zones include the following steps:
[0093] S1. After the frozen soil disturbance area at a depth of 0-50 cm has completely thawed, when it meets the sowing time period, turn the soil, spread peat debris on the soil surface of the frozen soil disturbance area, sow Leech Seeds at a rate of 2 kg / mu on July 13, 2023, and apply nitrogen fertilizer including urea at an application rate of 6 kg / mu. The sowing time period is 6 days after the deadline when the daily average soil temperature at a depth of 0 cm in the frozen soil disturbance area is not less than the first preset temperature value (10℃) for 10 consecutive days and the daily average soil temperature at a depth of 50 cm in the frozen soil disturbance area is not less than the second preset temperature value (8℃) for 12 consecutive days.
[0094] S2. Cover with a double-layer covering net until the daily average ground temperature at a depth of 0 cm in the permafrost disturbance zone is not less than the third preset temperature value (12℃) for 8 consecutive days (July 16, 2023). Remove part of the covering net, leaving only one layer of covering net. The covering net is a dense green net with a mesh size of 1000 mesh.
[0095] S3. When the grass seedlings grow to 5 cm in height, remove the last layer of covering netting.
[0096] The method for calculating the daily average ground temperature at a depth of 0 cm in the permafrost disturbance zone specifically includes the following steps:
[0097] The ground temperature at 0 cm in the permafrost disturbance zone was measured multiple times a day, and the average value was taken. The time interval between two consecutive ground temperature measurements was 4 hours.
[0098] The method for calculating the daily average ground temperature at a depth of 50 cm in the permafrost disturbance zone specifically includes the following steps:
[0099] The ground temperature at a depth of 50 cm in the permafrost disturbance zone was measured multiple times a day, and the average value was taken. The time interval between two consecutive ground temperature measurements was 4 hours.
[0100] <Vegetation Restoration Results>
[0101] The germination rate of Examples 1-3, the control group, and Comparative Examples 1-4 15 days after sowing and the average seedling height 30 days after sowing were statistically analyzed. The results of sowing *Leymus chinensis* seeds are shown in Table 1 below:
[0102] Table 1 Germination rate and average seedling height of each group 15 days after sowing and 30 days after sowing
[0103] Germination rate (%) Average seedling height (cm) Example 1 89.4 9.5 Example 2 94.2 9.4 Example 3 91.5 9.3 control group 37.2 6.1 Comparative Example 1 62.3 6.7 Comparative Example 2 77.6 8.3 Comparative Example 3 84.7 8.1 Comparative Example 4 83.4 8.3
[0104] According to the data in Table 1, compared with the methods of Comparative Examples 1-2 and the conventional method of the control group, the germination rate of grass seeds in the permafrost disturbance area was significantly improved by using the methods of Examples 1-3, the seedling height was also significantly increased, and the vegetation restoration effect was better. The reason for this can be analyzed by measuring the daily average ground temperature at a depth of 0 cm in the permafrost disturbance area for 8 consecutive days and the temperature at a depth of 50 cm in the permafrost disturbance area. The limitation of the average daily ground temperature for 10 consecutive days (cm) ensures that the soil in the permafrost disturbance area maintains a suitable temperature, which helps keep the endosperm cells inside the seeds active, promotes cell division and growth, and avoids the problems of low temperature and large diurnal temperature range in high-altitude areas affecting seed embryo development. This helps increase the germination rate of grass seeds and allows germinating seeds to better absorb nutrients from the permafrost disturbance area soil for growth. Using the method of Example 2, compared with Comparative Example 3, the germination rate of grass seeds in the permafrost disturbance area is significantly improved, and the seedling height is also significantly increased. This indicates that the double-layer dense green net can cover and protect the sowing area, increase the soil temperature, and promote seed germination. The depth of the permafrost disturbance area is 0 cm. The limitation of the daily average ground temperature value for 8 consecutive days and the third preset temperature value can ensure that the upper layer of dense green netting is removed in time after the embryo emerges from the seed. Retaining a layer of dense green netting is conducive to the seedlings growing towards the soil surface and unfolding their leaves for photosynthesis, which helps the vegetation in the permafrost engineering disturbance area at high altitude to recover quickly. Compared with Comparative Example 4, Example 2 showed a significant increase in the germination rate of grass seeds and the growth height of grass seedlings in the permafrost disturbance area, indicating that covering with a netting with a mesh size that matches the amount of grass seeds sown can effectively improve the germination rate of grass seeds and the growth height of grass seedlings.
[0105] During the experiment, it was found that when *Leymus chinensis* seeds were resown in the permafrost disturbance area within the appropriate sowing time, and no dense green netting was used to cover the seedlings during germination and growth, the average seedling height 30 days after resowing was less than 6.3 cm, which was significantly lower than in Examples 1-3. The reason for this was that the dense green netting not only effectively reduced the damage to the seedlings caused by weather phenomena such as hail, but also reduced wind speed and increased temperature, which had a significant effect on the rapid growth of seedlings in the short summer on the plateau.
[0106] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and embodiments shown and described herein.
Claims
1. A method for vegetation restoration in high-altitude permafrost engineering disturbance zones, characterized in that, Includes the following steps: S1. When the frozen soil disturbance area meets the sowing time period, turn the soil and spread organic matter on the soil surface of the frozen soil disturbance area. The organic matter shall include at least peat or sawdust. Sow seeds of Leymus chinensis at a rate of 1-2.5 kg / mu. Apply nitrogen fertilizer after sowing. The amount of nitrogen fertilizer applied per mu shall be 2-3 times the amount of grass seed. The sowing time period is 3-10 days after the deadline when the daily average soil temperature at a depth of 0 cm in the frozen soil disturbance area is not less than 10℃ for 10 consecutive days and the daily average soil temperature at a depth of 50-60 cm in the frozen soil disturbance area is not less than 8℃ for 12 consecutive days. S2. Cover with multiple layers of netting until the daily average ground temperature at a depth of 0 cm in the permafrost disturbance zone is not less than 12℃ for 8 consecutive days. Then remove part of the netting and keep only one layer of netting. S3. When the grass seedlings grow to a height of 5-8 cm, remove the last layer of covering netting.
2. The vegetation restoration method for high-altitude permafrost engineering disturbance areas as described in claim 1, characterized in that, The method for calculating the daily average ground temperature at a depth of 0 cm in the permafrost disturbance zone specifically includes the following steps: The ground temperature at 0 cm in the permafrost disturbance zone was measured multiple times a day, and the average value was taken. The time interval between two consecutive ground temperature measurements was at least 4 hours. The method for calculating the daily average ground temperature at a depth of 50–60 cm in the permafrost disturbance zone specifically includes the following steps: The ground temperature at a depth of 50-60 cm in the permafrost disturbance area was measured multiple times a day, and the average value was taken. The interval between two consecutive ground temperature measurements was at least 4 hours.
3. The vegetation restoration method for high-altitude permafrost engineering disturbance areas as described in claim 1, characterized in that, The covering net is a dense green net, and the mesh size of the covering net includes any one or more of 800 mesh, 1000 mesh, 1500 mesh, and 2000 mesh. Wherein, when the amount of grass seed sown is less than or equal to 2 kg / mu, the mesh size of the covering net is 1500 mesh or 2000 mesh; When the amount of grass seed sown is greater than 2 kg / mu, the mesh size of the covering net is 800 mesh or 1000 mesh.
Citation Information
Patent Citations
Method for promoting vegetation recovery of permafrost region progressive deteriorated grassland
CN107821018A