A method for rapidly improving the productivity of degraded grassland
By combining root cutting and fertilization with a full-cycle grazing ban, the problems of soil compaction and nutrient replenishment in degraded Leymus chinensis meadow grasslands under temperate continental semi-arid climates have been solved, resulting in rapid improvement and continuous enhancement of grassland productivity, making it suitable for large-scale promotion.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- INST OF AGRI RESOURCES & REGIONAL PLANNING CHINESE ACADEMY OF AGRI SCI
- Filing Date
- 2026-04-02
- Publication Date
- 2026-05-26
AI Technical Summary
Existing technologies are insufficient for the rapid and efficient restoration of degraded Leymus chinensis meadow grasslands in temperate continental semi-arid climates. Furthermore, existing technologies are inadequate in terms of soil compaction improvement and nutrient replenishment, failing to meet the needs for continuous improvement in grassland productivity.
The project employs a combined approach of root cutting and fertilization, including both upward and downward root cutting during the greening period, along with the precise application of organic fertilizer. It also incorporates a comprehensive grazing ban management system, forming an integrated restoration technology solution encompassing root cutting, fertilization, and maintenance.
It effectively breaks up soil compaction, improves soil aeration and water permeability, achieves efficient replenishment of soil nutrients, and rapidly and continuously enhances grassland productivity. It is highly adaptable and suitable for large-scale promotion.
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Figure CN122074348A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of grassland ecological restoration technology, specifically to a method for rapidly improving the productivity of degraded grassland. Background Technology
[0002] Leymus chinensis meadow steppe is a typical grassland ecosystem type in temperate continental semi-arid climate zones. It is not only an important high-quality forage production base for livestock development in northern my country, but also plays a crucial role in soil and water conservation and climate regulation. This type of grassland, with Leymus chinensis as the dominant species, is widely distributed in the grassland areas of northern my country. In recent years, affected by overgrazing, continuous mowing, and other factors, Leymus chinensis meadow steppes in temperate continental semi-arid climate zones have generally experienced varying degrees of degradation. This is manifested in reduced Leymus chinensis community cover, increased soil compaction, decreased organic matter content, severe nutrient loss, and a significant decline in grassland productivity. This not only seriously restricts the sustainable development of grassland animal husbandry but also damages the stability and service functions of the grassland ecosystem.
[0003] Regarding the issue of improving the productivity of Leymus chinensis grasslands, existing technologies have yielded relevant research and solutions. For example, the invention patent with publication number CN113068569A significantly improved the productivity of Leymus chinensis grasslands in the Songnen Plain by applying nitrogen fertilizer containing pure nitrogen and spraying plant biostimulants. However, existing technologies mainly focus on soil nutrient replenishment and are difficult to simultaneously improve the soil physical structure of degraded grasslands with compaction. Furthermore, these technologies are primarily suitable for Leymus chinensis grasslands in the Songnen Plain. For Leymus chinensis meadows in temperate continental semi-arid climates, existing technologies lack a coordinated design for root cutting and fertilization operations, and have not formed a supporting long-term enclosure and management system, resulting in insufficient sustainability of grassland productivity improvement. At the same time, some operational schemes of these technologies do not fully consider the adaptability for large-scale promotion and cannot meet the practical application needs for rapid and efficient restoration of degraded Leymus chinensis meadows in temperate continental semi-arid climates. Therefore, developing efficient and easily promoted methods for improving the productivity of degraded Leymus chinensis meadows adapted to this climate type has become an urgent need in the field of grassland ecological restoration. Summary of the Invention
[0004] The purpose of this invention is to provide a method for rapidly improving the productivity of degraded grassland, so as to solve the problems mentioned in the background art.
[0005] To achieve the above objectives, the present invention provides the following technical solution:
[0006] A method for rapidly improving the productivity of degraded grassland involves selecting degraded grassland with Leymus chinensis as the dominant species, performing root cutting and fertilization in synergistic operation, and then carrying out enclosure and management to obtain restored grassland.
[0007] Furthermore, the root cutting operation in the synergistic operation of root cutting and fertilization is carried out during the grassland greening period, with a total of 1-2 root cutting operations, and the interval between the two root cutting operations is 6-10 days.
[0008] Furthermore, the first root cutting operation in the root cutting process is a forward cut, and the second root cutting operation is... Cut obliquely, and the root cutting depth of both root cutting operations is 12-15cm, and the root cutting distance is 20-30cm.
[0009] Furthermore, the fertilization operation in the root cutting and fertilization synergistic operation is the application of organic fertilizer, which is either mixed organic fertilizer or granular organic fertilizer. The application rate of the organic fertilizer is 45-60 kg / mu. The mixed organic fertilizer is composed of biological organic fertilizer and granular organic fertilizer mixed in a 1:1 ratio.
[0010] Furthermore, if the root cutting operation is performed twice, the fertilization operation will be carried out 3-5 days after the second root cutting operation, and organic fertilizer will be evenly spread on the surface of the degraded grassland after the second root cutting operation using a mechanical fertilizer spreader; if the root cutting operation is performed once, the fertilization operation will be carried out 3-5 days after the first root cutting operation, and organic fertilizer will be evenly spread on the surface of the degraded grassland after the first root cutting operation using a mechanical fertilizer spreader.
[0011] Furthermore, the organic matter content of the bio-organic fertilizer is ≥45%, and the effective live bacteria count is ≥100 million / g; the organic matter content of the granular organic fertilizer is ≥35%, and the total nitrogen, phosphorus, and potassium nutrients are ≥5%.
[0012] Furthermore, the enclosure and management refers to the full-term grazing ban management of degraded grasslands after the combined operation of root cutting and fertilization. The duration of the full-term grazing ban management is 2-2.5 years, which is used to prevent livestock from grazing and trampling, and to promote the natural recovery of sheepgrass communities.
[0013] Compared with existing technologies, this invention addresses the key challenges in restoring degraded Leymus chinensis meadow steppes in temperate continental semi-arid climates. It employs a synergistic approach of 1-2 root prunings (both forward and oblique) during the greening period, combined with precise application of granular organic fertilizer. This effectively breaks up soil compaction and improves soil aeration and water permeability, while the scientific application of high-grade organic fertilizer efficiently replenishes soil nutrients. Furthermore, a targeted enclosure and management system is designed, forming an integrated restoration solution encompassing root pruning, fertilization, and management. This achieves the dual benefits of improved soil physical structure and nutrient replenishment, effectively promoting the natural recovery of Leymus chinensis communities and rapidly and continuously enhancing the productivity of degraded grasslands. The entire method is simple to operate, with highly adaptable process parameters, perfectly meeting the restoration needs of degraded Leymus chinensis meadow steppes in temperate continental semi-arid climates. It possesses excellent prospects for large-scale application and overcomes the shortcomings of existing technologies in terms of synergy, sustainability, and adaptability in the restoration of this type of degraded grassland. Attached Figure Description
[0014] To more clearly illustrate the technical solutions and advantages in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0015] Figure 1 Figures showing the changes in green aboveground biomass, belowground biomass, and aboveground biomass of sheep pasture in grassland communities under different restoration treatments.
[0016] Figure 2 A graph showing the changes in dominant Leymus chinensis species and plant community characteristics under different restoration treatments.
[0017] Figure 3 This is a diagram showing the changes in soil nutrient stratification characteristics under different remediation treatments.
[0018] Figure 4 The overall score and evaluation chart for different repair treatments. Detailed Implementation
[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.
[0020] Example
[0021] This embodiment uses a degraded grassland in a meadow steppe in Hulunbuir City, Inner Mongolia Autonomous Region as the experimental subject to conduct a grassland productivity improvement experiment. This area belongs to the temperate continental semi-arid climate zone, with an average annual temperature of 3℃ and an average annual precipitation of 320mm. The soil type is chestnut calcareous soil, which meets the applicable scenario of this invention. The organic matter content of the bio-organic fertilizer used in this embodiment is 45%, and the effective live bacteria count is 100 million / g. The organic matter content of the granular organic fertilizer used is 35%, and the total nitrogen, phosphorus, and potassium nutrient content is 5%. The fertilizer quality of both granular organic fertilizer and bio-organic fertilizer meets the requirements of NY / T525 organic fertilizer and NY884 bio-organic fertilizer. Grassland-specific root cutting machine is used for root cutting, and mechanical fertilizer spreader is used for fertilization. Both are conventional and commonly used equipment for grassland ecological restoration.
[0022] The grassland productivity enhancement experiment adopted a randomized block design, with a total of 6 treatment groups. The experimental plot area of each treatment group was 20m×20m, and a 5m wide isolation strip was set between the experimental plots to avoid marginal effects and interference between treatments. The specific design of each treatment group is shown in Table 1 below.
[0023] Table 1: Experimental Treatment Design Table
[0024] Repair technology Repair Processing Group Abbreviation Blank control none CK Root cutting + bio-organic fertilizer One root trimming operation + application of 60 kg / mu of bio-organic fertilizer RBF Root cutting + granular organic fertilizer One root trimming operation + 60 kg / mu of granular organic fertilizer RGF Root cutting + bio-organic fertilizer Two root cutting operations + application of 60 kg / mu of bio-organic fertilizer 2RBF Root cutting + granular organic fertilizer Two root trimming operations + application of 60 kg / mu of granular organic fertilizer 2RGF Root cutting + mixed organic fertilizer Two root cutting operations + 30 kg / mu of bio-organic fertilizer + 30 kg / mu of granular organic fertilizer RBGH
[0025] All treatment groups began their operations during the greening-up period of Leymus chinensis (early May) in the experimental year, and the specific procedures were as follows:
[0026] (1) Root cutting operation: The 2RBF and 2RGF treatment groups performed two root cutting operations, the first being a forward root cutting, and the second being a reverse root cutting. The root cutting was performed at an angle, with an 8-day interval between the two root cutting operations. The depth of both root cutting operations was 13cm and the root cutting distance was 25cm. The RBF, RGF, and RBGH treatment groups only performed one antegrade root cutting operation during the first operation, with the root cutting depth and distance being the same as other treatment groups. The CK group did not perform any root cutting operations.
[0027] (2) Fertilization: Fertilization was carried out on the 4th day after the second root cutting operation for the 2RBF and 2RGF treatment groups. Fertilization was carried out on the 4th day after the first root cutting operation for the RBF, RGF and RBGH treatment groups. Pellet organic fertilizer, bio-organic fertilizer or mixed organic fertilizer of granular organic fertilizer and bio-organic fertilizer were evenly spread on the surface of the grassland by mechanical fertilizer spreader according to the specific fertilization treatment method in Table 1. No fertilization or shallow tillage was carried out for CK.
[0028] (3) Enclosure and management: Enclosure and management will be carried out simultaneously after the fertilization operation of all treatment groups. The grazing ban period is 2 years. Livestock are prohibited from grazing and trampling throughout the entire period to ensure the natural recovery of sheep grass communities.
[0029] The index measurements were conducted in early September of the experimental year when the Leymus chinensis reached full maturity. Five 1m × 1m quadrats were set up in each experimental plot using a five-point sampling method. The index measurements and methods for each quadrat are as follows:
[0030] Vegetation community and productivity indicators: Community height, community density, and community cover were measured. All aboveground vegetation in the sample plots was harvested at ground level using the harvesting method, sorted, and dried at 65℃ to constant weight. The existing green aboveground biomass was measured and converted into grassland productivity per unit area. Simultaneously, the plant height, population density, and aboveground biomass of the dominant species, Leymus chinensis, were measured in each sample plot. Roots in the 0-30cm soil layer were collected using the root awl method, washed, separated, and dried to constant weight to measure underground biomass.
[0031] Soil physicochemical properties: Soil samples were collected from each quadrat in stratified layers of 0-15cm and 15-30cm. Soil bulk density was determined by ring sampler method and soil moisture content was determined by oven drying method. After natural air drying, grinding and sieving, the contents of soil organic carbon (SOC), total nitrogen (TN), total phosphorus (TP) and available nitrogen (AN) were determined to analyze the stratified characteristics of soil nutrients. Soil organic carbon (SOC) was determined by potassium dichromate oxidation-external heating method, total nitrogen (TN) was determined by Kjeldahl method, available nitrogen (AN) was determined by alkaline diffusion method, and total phosphorus (TP) was determined by molybdenum antimony colorimetric method.
[0032] The mean values of the measured indicators from the three parallel quadrats in each experimental plot were taken as the measurement results for the corresponding treatment group in that experimental plot. One-way ANOVA was used to test the significance of differences. Factor analysis was used to evaluate the comprehensive remediation effect of different treatment groups. The measurement results and analysis are as follows:
[0033] Different remediation treatments all improved the biomass and productivity of degraded grassland communities to varying degrees. The effect on productivity was mainly reflected in the aboveground parts, as shown in the measurement results. Figure 1 As shown: Regarding the aboveground biomass of the community, the range of variation among the treatment groups was 167.64-327.31. The aboveground biomass of the RGF and 2RGF treatment groups was significantly higher than that of the control (CK) (P<0.05). The 2RGF treatment group showed the most significant improvement, with aboveground biomass increasing by 95.25% compared to the CK treatment group, and grassland productivity reaching 218.21 kg / mu, nearly twice that of the CK treatment group, and significantly higher than the RBF, 2RBF, and RBGH treatment groups. The aboveground biomass of the RBF, 2RBF, and RBGH treatment groups also showed significant increases compared to the CK treatment group, with increases ranging from 37.5% to 73.5%. The underground biomass varied among the treatments from 2513.83 to 4348.63. There were no significant differences among the treatments (P>0.05), indicating that the root-cutting and fertilization synergistic operation of the present invention has no significant regulatory effect on grassland underground biomass in the short term and will not cause destructive impact on the grassland underground root system. The aboveground biomass of the dominant species, Leymus chinensis, responded significantly to the restoration treatment. The aboveground biomass of Leymus chinensis in the RBGH treatment group was the highest, reaching 46.77 kg / mu, which was more than 2 times higher than CK and significantly higher than other treatment groups (P<0.05). The aboveground biomass of Leymus chinensis in the other root-cutting and fertilization treatment groups was significantly higher than CK, with no significant differences among the groups. This indicates that the mode of secondary root cutting combined with the mixed application of bio-organic fertilizer and granular organic fertilizer of the present invention has the best promoting effect on the growth and restoration of the dominant species, Leymus chinensis, which is in line with the restoration core of degraded Leymus chinensis meadow grassland by restoring the dominant species to stabilize the community structure.
[0034] Different remediation treatments all significantly improved the structural characteristics of degraded grassland communities, as shown in the measurement results. Figure 2 As shown: In terms of overall community characteristics, the vegetation cover and community density of all root-cutting fertilization treatment groups were higher than those of the CK treatment group. Among them, the RBGH treatment group performed the best, with the highest vegetation cover and community density of all treatment groups, which were 42.6% and 68.3% higher than those of the CK treatment group, respectively. In terms of community height, all root-cutting fertilization treatment groups were significantly higher than those of the CK, with the 2RGF and RBGH treatment groups showing the most significant improvement. Regarding the growth characteristics of the dominant Leymus chinensis species, the RBGH treatment group showed the highest coverage, plant height, and population density among all treatment groups, increasing by 57.2%, 38.8%, and 12 times respectively compared to the CK treatment group. This aligns with the trend in Leymus chinensis biomass, further validating the crucial role of the two-stage root pruning combined with mixed organic fertilizer in the recovery of Leymus chinensis populations. The 2RBF and 2RGF treatment groups, which combined two-stage root pruning with single organic fertilizer, had a weaker promoting effect on Leymus chinensis growth than the RBGH treatment group and to some extent weakened the dominance of Gramineae in the community. In contrast, the RBGH treatment group had the highest Gramineae importance value at 33.79%, effectively maintaining the dominant position of Gramineae in the community and ensuring the long-term stability of the grassland community. From the perspective of community ecotype structure, the proportion of xerophytic groups in each root-cutting fertilization treatment group increased to 48.50%-55.80% overall, with the RGF and RBGH treatment groups having the highest proportions. This indicates that the restoration method of the present invention can effectively enhance the drought resistance characteristics of the community and improve the plant's adaptability to the arid environment of the temperate continental semi-arid climate zone.
[0035] All root-cutting fertilization treatments effectively improved the soil physicochemical properties of degraded grasslands, achieving soil structure improvement and fertility enhancement. Furthermore, the soil nutrient response to the remediation treatments exhibited a clear stratified characteristic, as shown in the measurement results. Figure 3As shown: Regarding soil physical structure, in the 0-15cm topsoil layer, the soil bulk density of each root-cutting fertilization treatment group decreased to varying degrees compared to the CK treatment group. The 2RBF treatment group showed the most significant decrease, reducing bulk density by 15.2% compared to the CK group, effectively breaking up the soil compaction problem in chestnut calcareous soil and significantly improving soil aeration and permeability. The RBF, RGF, 2RGF, and RBGH treatment groups showed a decrease in bulk density between 6.8% and 12.3% compared to the CK treatment group, also demonstrating good soil structure improvement effects. Regarding soil moisture content, in the 0-15cm topsoil layer, the RBGH treatment group... The soil moisture content was significantly lower than that of the CK treatment group and other root-cutting fertilization treatment groups (P<0.05). There were no significant differences in soil moisture content between the remaining root-cutting fertilization treatment groups and the CK treatment group (P>0.05). In the 15-30cm subsurface soil layer, there were no significant differences in soil bulk density and soil moisture content among the treatment groups (P>0.05). This indicates that the soil physical structure improvement effect of the root-cutting fertilization synergistic operation of this invention is mainly concentrated in the densely rooted surface area, which can specifically match the root growth needs of herbaceous plants such as Leymus chinensis. Regarding soil nutrients, the remediation effect showed significant soil layer differentiation characteristics in the 0-15cm layer. In the topsoil layer, the contents of soil organic carbon, total nitrogen, total phosphorus, and available nitrogen in each root-cutting fertilization treatment group were all higher than those in the control (CK) group, but the differences between groups were not statistically significant (P>0.05). This indicates that the synergistic root-cutting fertilization operation of the present invention can replenish the basic nutrients in the topsoil in the short term, while the continuous accumulation of total nutrients in the topsoil requires a longer period of time. In the 15-30cm subsoil layer, soil nutrients are more sensitive to the remediation treatment. Among them, the contents of soil organic carbon, total nitrogen, total phosphorus, and available nitrogen in the RBF treatment group were significantly higher than those in the CK treatment group and other root-cutting fertilization treatment groups (P<0.05). Compared to the control group, the levels of total nutrients, available nitrogen, phosphorus, and alkali-available nitrogen in the subsoil were increased by 32.7%, 28.4%, 25.6%, and 36.2%, respectively. The effects on the total and available nutrients in the subsoil were the most stable, indicating that the single-application root-cutting combined with bio-organic fertilizer is more conducive to the migration and transformation of soil nutrients to the subsoil, effectively improving the fertility of deeper soil layers. The 2RBF, RGF, 2RGF, and RBGH treatment groups also showed significant increases in subsoil organic carbon, total nitrogen, total phosphorus, and available nitrogen compared to the control group (P<0.05), with increases ranging from 12.5% to 24.8%, demonstrating excellent soil fertility improvement effects. Overall, the root-cutting and fertilization synergistic operation of this invention can simultaneously improve the physicochemical properties of both the top and subsoil layers, breaking up soil compaction while providing long-term nutrient replenishment, laying a solid soil foundation for the long-term stable growth and continuous improvement of grassland community productivity.
[0036] Based on 10 core indicators including soil cover, biomass, soil bulk density, and soil moisture content, factor analysis was used to evaluate the comprehensive effects of different remediation treatments. Four principal components were extracted, with a cumulative contribution rate of 80.353%, representing four dimensions: plant diversity, soil physical properties and basic fertility, phosphorus availability and vegetation cover, and plant productivity. The comprehensive evaluation results are as follows: Figure 4 As shown, different root-cutting fertilization treatments had significant differences in their effects on the restoration of degraded mowed grassland (P<0.001). The RGF treatment group had the highest overall score (0.4233±0.3684), achieving synergistic improvement in plant diversity, available phosphorus availability, and productivity, and exhibiting the best overall performance. The 2RBF treatment group had the second highest overall score (0.3167±0.0235), showing outstanding performance in improving soil physical structure and enhancing fertility. The RBGH treatment group ranked third overall (0.0200±0.4115), showing balanced performance across all dimensions and a significant advantage in restoring the dominant species, Leymus chinensis. Among all treatment groups, the CK blank control group had the lowest overall score (-0.3933±0.5752), significantly lower than all root-cutting fertilization treatment groups.
[0037] In summary, this embodiment, conducted in a degraded chestnut soil area of the sheepgrass meadow grassland in Hulunbuir City, Inner Mongolia Autonomous Region, under a temperate continental semi-arid climate, verified the effectiveness and superiority of the method for rapidly improving the productivity of degraded grassland using the present invention, through setting up a blank control and combinations of different root cutting frequencies and different types of organic fertilizer. The experimental results show that the integrated technical solution adopted in this invention—1-2 root cutting operations during the greening period (first straight root cutting, second 45° oblique root cutting, root cutting depth 12-15cm, root cutting spacing 20-30cm, interval between the two operations 6-10 days), application of 45-60kg / mu of organic fertilizer (a 1:1 mixture of granular organic fertilizer or bio-organic fertilizer and granular organic fertilizer) within 3-5 days after root cutting, and a 2-2.5 year full-term grazing ban and enclosure management—can precisely meet the restoration needs of degraded sheepgrass meadow grassland under a temperate continental semi-arid climate. Root cutting breaks up soil compaction and improves soil physical structure, while the application of organic fertilizer promotes the long-term growth of soil nutrients. Effective supplementation forms a synergistic restoration system of physical improvement, nutrient replenishment, and community conservation. Among them, the 2RGF model, which combines two-time root cutting with the application of granular organic fertilizer, can maximize the improvement of aboveground productivity in degraded grasslands; the RGF model, which combines one-time root cutting with the application of granular organic fertilizer, can achieve multi-objective synergistic improvement of plant diversity, soil fertility, and grassland productivity; the RBGH model, which combines two-time root cutting with the application of mixed organic fertilizer, can specifically promote the population recovery of dominant species Leymus chinensis and effectively maintain the dominance of Poaceae in the community; the RBF model, which combines one-time root cutting with the application of bio-organic fertilizer, has the most prominent effect on improving the fertilization of subsoil, but its effect on improving aboveground productivity is not significant.
[0038] The technical solution of this invention is simple to operate, and all the equipment used are conventional and general-purpose equipment for grassland ecological restoration. The fertilizer indicators meet the relevant national standards, and the process parameters are highly adaptable. The treatment mode of the experimental plot can be directly replicated and promoted to large-scale degraded grassland restoration projects. It can effectively promote the natural recovery of sheepgrass communities, rapidly and continuously improve the productivity of degraded grasslands, and has both ecological and production benefits. It makes up for the shortcomings of existing technologies in terms of synergy, sustainability and adaptability in the restoration of this type of degraded grassland, and has good prospects for large-scale promotion and application.
[0039] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them; modifications to the technical solutions described in the foregoing embodiments, or equivalent substitutions of some of the technical features, do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.
Claims
1. A method for rapidly increasing the productivity of degraded grassland, characterized in that, Degraded grasslands with Leymus chinensis as the dominant species were selected, and after root cutting and fertilization were carried out in conjunction with enclosure and management, restored grasslands were obtained.
2. The method for rapidly improving the productivity of degraded grassland according to claim 1, characterized in that, The root cutting operation in the coordinated root cutting and fertilization operation is carried out during the grassland greening period, and a total of 1-2 root cutting operations are performed, with an interval of 6-10 days between the two root cutting operations.
3. The method for rapidly improving the productivity of degraded grassland according to claim 2, characterized in that, The first root cutting operation in the aforementioned root cutting process is a forward cut, and the second root cutting operation is... Cut obliquely, and the root cutting depth of both root cutting operations is 12-15cm, and the root cutting distance is 20-30cm.
4. The method for rapidly improving the productivity of degraded grassland according to claim 1, characterized in that, The fertilization operation in the root cutting and fertilization synergistic operation is the application of organic fertilizer, which is either mixed organic fertilizer or granular organic fertilizer. The application rate of the organic fertilizer is 45-60 kg / mu. The mixed organic fertilizer is composed of biological organic fertilizer and granular organic fertilizer mixed in a 1:1 ratio.
5. The method for rapidly improving the productivity of degraded grassland according to claim 4, characterized in that, If the root cutting operation is performed twice, the fertilization operation will be carried out 3-5 days after the second root cutting operation, and the organic fertilizer will be evenly spread on the surface of the degraded grassland after the second root cutting operation using a mechanical fertilizer spreader; if the root cutting operation is performed once, the fertilization operation will be carried out 3-5 days after the first root cutting operation, and the organic fertilizer will be evenly spread on the surface of the degraded grassland after the first root cutting operation using a mechanical fertilizer spreader.
6. The method for rapidly improving the productivity of degraded grassland according to claim 4, characterized in that, The organic matter content of the bio-organic fertilizer is ≥45%, and the effective live bacteria count is ≥100 million / g; the organic matter content of the granular organic fertilizer is ≥35%, and the total nitrogen, phosphorus, and potassium nutrients are ≥5%.
7. The method for rapidly improving the productivity of degraded grassland according to claim 1, characterized in that, The enclosure and management refers to the full-term grazing ban on degraded grasslands after root cutting and fertilization, which lasts for 2-2.5 years. This is to prevent livestock from grazing and trampling the grasslands and to promote the natural recovery of sheepgrass communities.