CN113632672B - A biological control method for the expansion of shrubby grassland in loess area - Google Patents

Abstract

The invention discloses a biological control method for the expansion of shrubs in the thicket grasslands in the loess area. Part; Step 2: Use 10-pin density black shade net to cover the area where the above ground part of the shrub is cut, and fix the surrounding area of the shade net; Step 3: After 3 months of shading, open the shade net to cut off the new branches of the shrub. The buds were manually removed, and the sunshade net was continued to be fixed after 2 days. After 2 repetitions, there were basically no new shoots on the shrub; Step 4: The sunshade net was removed at the beginning of the second growing season, and the number of new shoots of the shrub had dropped to a very low level. ; Step 5: In the shade shrub area, combined with the growth of herbs, appropriate amount of forage grass is supplemented to improve the nutrient competitive advantage of herbs. The invention adopts the means of combining cutting and shading to effectively control the growth of the shrub and prevent its further expansion tendency.

Description

A biological control method for the expansion of shrubby grassland in loess area

technical field

The invention belongs to the technical field of shrub expansion prevention and control, and in particular relates to a biological control method for shrub expansion in a thicketed grassland in a loess area.

Background technique

Grassland scrub refers to a global phenomenon characterized by the increase in the density, coverage and biomass of native shrubs. The area of grassland shrub formation includes a number of ecosystems such as arid and semi-arid grasslands, humid grasslands, and polar tundra. It has the characteristics of a wide range of occurrence, rapid development, and great harm. In recent years, the process of shrub formation has accelerated. the trend of. Grassland shrubs usually lead to changes in ecosystem structure and function, reduce forage yield and biodiversity, and may even lead to land degradation and desertification in arid areas, seriously threatening the sustainable development of grasslands and livestock production.

At present, the research content of shrubby at home and abroad mainly focuses on the theoretical research on the formation mechanism of shrubby, its impact on species diversity, and the competitive relationship between shrubs and grasslands. However, for the expansion trend of shrubs, the actual control method is still in the The exploratory phase, especially in the arid and semi-arid montane grasslands, is less studied. In the prior art, for grassland shrubs, the shrubs are mainly removed by machinery, and then the method of fully planting grass seeds is used to remove the shrubs. Not only is the cost high, but also large-scale machinery is not suitable for operation in mountainous grasslands. Practical methods for clustering

SUMMARY OF THE INVENTION

The purpose of the invention is to provide a biological control method for the expansion of shrubs in the loess area, aiming at the defects and deficiencies of the prior art, so as to provide a technical support for grassland ecological restoration.

For achieving the above object, the technical scheme adopted in the present invention is:

A biological control method for the expansion of shrubby steppe shrubs in a loess area, comprising the following steps:

Step 1: At the beginning of the growth season of the shrubland grassland in the loess area, use a shrub cutting device to remove the above-ground growing parts of the shrubs, grasslands and shrubs;

Step 2: Use 10-pin density black shade net to cover the area where the aboveground part of the shrub is cut off, and fix the surrounding area of the shade net;

Step 3: After 3 months of shading, open the sunshade net to manually remove the new branches and buds in the cut part of the shrub, continue to fix the sunshade net after 2 days, and after repeating 2 times, basically no new branches and buds appear on the shrub;

Step 4: The shade net is removed at the beginning of the second growing season, and the number of new shoots of the shrub has dropped to a very low level;

Step 5: In the shade shrub area, combined with the growth of herbs, appropriate amount of forage grass is supplemented to improve the nutrient competitive advantage of herbs.

Preferably, in step 1, the shrub cutting device includes an operating table, and at least three telescopic rods are arranged on the lower end surface of the operating table along its circumferential direction, and the upper ends of the telescopic rods are movably connected with the hinge seat on the lower end surface of the operating table, so The upper end of the operating table is provided with a vertical adjustment rod, and the lower end of the vertical adjustment rod penetrates out of the operating table and is fixed with a horizontal guide rail. A horizontal plate is provided, two symmetrical supports are arranged on the lower end surface of the horizontal plate, a screw rod is arranged between the two supports, one end of the screw rod is rotatably connected with one of the supports, and the other end Passing through another support and connected to the third motor, a slider is arranged on the screw rod, the lower end of the slider is connected with a C-shaped mounting seat through a connecting rod, and a cutting assembly is arranged on the C-shaped mounting seat.

Preferably, a second motor is provided on the upper end surface of the operating table, the output shaft of the second motor is connected with a second gear, the side wall of the vertical adjustment rod is provided with a first tooth slot, the first The tooth slot meshes with the second gear.

Preferably, two side walls of the horizontal guide rail are provided with mutually symmetrical sliding grooves, and one side of the upper end surface of the horizontal slide table is provided with an inverted L-shaped connecting block, and the horizontal part of the inverted L-shaped connecting block is located therein. In one chute, and can slide along the chute, the inner wall of the other chute is provided with a second tooth slot along its length direction, and the other side of the upper end face of the horizontal slide table is provided with a first motor and a support rod, The upper end of the support rod is provided with a turntable, the lower end surface of the turntable is provided with a T-shaped guide groove along its circumferential direction, the upper end of the support rod is provided with a T-shaped block, and the T-shaped block is located in the T-shaped guide groove. , a first gear is arranged above the first motor, the first gear meshes with the inner ring gear of the turntable, the outer ring gear of the turntable meshes with the second tooth slot, and the first motor drives the first gear Rotation, the first gear drives the turntable to rotate, and the turntable moves along the second tooth slot to drive the horizontal slide table to move along the horizontal guide rail.

Preferably, the horizontal part of the inverted L-shaped connecting block is provided with a through hole penetrating its height, a compression spring and a partition plate are arranged in the through hole, a vertical section is arranged in the central part of the compression spring, and the vertical The segment penetrates through the partition plate, the two ends of the compression spring are respectively provided with balls, and the parts of the balls exposed outside the through holes are in sliding contact with the upper and lower inner walls of the chute.

Preferably, the upper end of the connecting rod is rotatably connected with the lower end surface of the slider, the lower end of the connecting rod is fixedly connected with the C-shaped mounting seat, the connecting rod is provided with a third gear, and the lower end surface of the slider is also A fourth motor is provided, the output shaft of the fourth motor is connected with a fourth gear, and the fourth gear is meshed with the third gear.

Preferably, the cutting assembly includes a movable blade and a stationary blade, the movable blade and the stationary blade are connected to the upper and lower extension blocks on the C-shaped mounting seat through a fixed rod, and the proximal end of the movable blade is arc-shaped The edge extends to the inside of the C-shaped mounting seat, the end of the arc-shaped side is provided with first teeth, the C-shaped mounting seat is provided with a first rotating rod, and the upper and lower ends of the first rotating rod are respectively connected with The inner top wall and the inner bottom wall of the C-type mounting seat are rotatably connected, the first rotating rod is provided with a fifth gear, the fifth gear meshes with the first teeth, and is also provided on both sides of the first rotating rod There are a second rotating rod and a third rotating rod that are symmetrical to each other, and the two ends of the second rotating rod and the third rotating rod are respectively rotatably connected with the inner top wall and the inner bottom wall of the C-shaped mounting seat, and the second rotating rod The rod and the third rotating rod are respectively provided with a first disc and a second disc, the outer walls of the first disc and the second disc are respectively provided with second teeth and third teeth, the The second tooth and the third tooth mesh with the fifth gear;

The second rotating rod and the third rotating rod are also provided with a sixth gear and a seventh gear respectively, the sixth gear and the seventh gear are connected by a belt, and a worm gear is also set on the third rotating rod, so the A fifth motor is also arranged on the inner bottom wall of the C-shaped mounting seat, and the output shaft of the fifth motor is connected with a worm, and the worm is engaged with the worm wheel.

Preferably, the fixing rod includes a spacer block, a polygonal segment, a smooth segment and a threaded segment from bottom to top, the lower extension block and the fixed blade are provided with a polygonal hole that cooperates with each other, and the polygonal segment is located in the polygonal hole, The mounting hole on the movable blade is located on the smooth section and can be rotated along the smooth section, and the threaded section penetrates the upper extension block and is threadedly connected with the fixing nut.

Preferably, in step 2, a PVC pipe or shrub twig is rolled around the surrounding edge of the sunshade net, and then fixed with a fixing component.

Preferably, in step 3, after 3 months of shading, the herbs grow vigorously under the shading net, while the new branches and buds of the shrubs are very few, and the new branches and buds are in a wilting state.

Beneficial effects of the present invention: the present invention adopts the means of combining cutting and shading to effectively control the growth of shrubs and prevent their further expansion tendency. And it has been verified that after the shading net is removed at the beginning of the second growing season, the incidence of new shrubs in the shaded area is only 5%, and the incidence of new shrubs in the subsequent growth season does not increase. Recovery has worked well.

The shrub cutting device designed by the invention can be well adapted to the sloping environment. When in use, the operating table passes the length of several telescopic rods so that the cutting assembly is always in the horizontal direction, so that the incision formed by cutting the shrub is in a horizontal and smooth state, and at the same time cutting The component can be adjusted in the vertical direction through the vertical adjustment rod, the adjustment in the front and rear direction can be realized by moving the horizontal sliding table along the guide rail, and the adjustment of the action direction can be realized through the slider. Secondly, the fourth motor can also drive the fifth gear to engage the fourth gear to drive the support rod to rotate, so as to adjust the angle of the cutting assembly. Therefore, without moving the operating table, the surrounding shrubs can be cut, and the operation is more convenient. Save manpower and material resources.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative efforts.

Fig. 1 shows the flow chart of the biological control method of a kind of loess area scrubbing steppe shrub expansion of the present embodiment;

Fig. 2 shows the effect diagram of the experimental area of the present embodiment; (a) remove the aboveground part of the shrub without shading treatment after 3 months herb growth figure; (b) remove the aboveground part of the shrub after shading treatment the herb after 3 months Plant growth diagram; (c) The growth of new shoots of shrubs after 3 months of unshading treatment after removing the aerial part of the shrub; (d) The growth of new shoots of shrubs after 3 months of shading treatment of the above-ground part of the shrub;

FIG. 3 is a schematic structural diagram of a shrub cutting device in a biological control method for expanding shrubs in a thicketed grassland in a loess area according to the present embodiment.

FIG. 4 is a schematic diagram showing the connection of the vertical adjustment rod, the horizontal guide rail, the horizontal plate and the C-shaped mounting seat in this embodiment.

FIG. 5 is an enlarged view of A in FIG. 4 .

FIG. 6 is a top view of the turntable of FIG. 5 .

FIG. 7 is a top view showing the connection between the vertical adjustment rod and the horizontal guide rail in this embodiment.

FIG. 8 is a side sectional view of the C-type mounting seat in this embodiment.

FIG. 9 is a cross-sectional view taken along the B direction in FIG. 8 .

FIG. 10 is a schematic diagram showing the connection between the movable blade and the fixed blade in FIG. 8 .

FIG. 11 is a schematic diagram of the fixed blade in this embodiment.

FIG. 12 is a schematic diagram of the fixing rod in this embodiment.

FIG. 13 is a schematic diagram of the fixing assembly for fixing the shade net.

Among them, 1. console; 101, hinge seat; 2, vertical adjustment rod; 201, first tooth slot; 3, horizontal guide rail; 301, chute; 302, second tooth slot; 4, horizontal slide table; 401, Inverted L-shaped connecting block; 4011, partition plate; 4012, compression spring; 4013, ball; 402, turntable; 4021, inner gear; 4022, outer ring; 4023, T-shaped guide groove; 403, first motor; 404 , first gear; 405, support rod; 4051, T block; 5, horizontal plate; 6, slider; 7, C type mounting seat; 701, upper extension block; 702, lower extension block; 703, baffle; 8. Moving blade; 801, first tooth; 9, fixed blade; 901, polygon hole; 10, second gear; 11, second motor; 12, third motor; 13, telescopic rod; 1301, cone fixed part; 14, screw; 15, support; 16, connecting rod; 17, third gear; 18, fourth motor; 19, fourth gear; 20, fifth gear; 21, first lever; 22, The first disc; 23, the second disc; 24, the seventh gear; 25, the belt; 26, the worm gear; 27, the worm; 28, the second rotary rod; 29, the third rotary rod; 30, the fifth motor; 31, fixed rod; 3101, spacer; 3102, polygonal segment; 3103, smooth segment; 3104, threaded segment; 32, fixed nut; 33, hinged seat; 34, PVC pipe; 35, inverted U-shaped insert rod; 36, Knock noodles.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments These are some embodiments of the present invention, but not all embodiments. The components of the embodiments of the invention generally described and illustrated in the drawings herein may be arranged and designed in a variety of different configurations.

Thus, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

The present embodiment specifically provides a biological control method for the expansion of shrubs in the loess area, as shown in Figure 1, comprising the following steps:

Step 1: At the beginning of the growing season of the shrubland grassland in the loess area, use a shrub cutting device to remove the above-ground growing parts of the shrubs and grasslands, so as to cut off the organs of the shrubs that produce and transport nutrients;

Step 2: Use 10-pin density black shade net to cover the area where the above ground part of the shrub is cut off, and fix the surrounding area of the shade net to prevent the shade net from being damaged during the shading period;

Step 3: After 3 months of shading, open the sunshade net to manually remove the new branches and buds in the cut part of the shrub, continue to fix the sunshade net after 2 days, and after repeating 2 times, basically no new branches and buds appear on the shrub;

Step 4: Remove the shading net at the beginning of the second growing season, and the number of new branches and buds of the shrub has dropped to a very low level. Cutting + shading effectively inhibits the growth of the shrub and prevents its further expansion;

Step 5: In the shade shrub area, combined with the growth of herbs, appropriate amount of forage grass is supplemented to improve the nutrient competitive advantage of herbs.

As shown in Figures 3 and 4, in this embodiment, in step 1, the shrub cutting device includes an operation table 1, and at least three telescopic rods 13 are arranged on the lower end surface of the operation table 1 along its circumferential direction. The telescopic rods 13 The upper end of the telescopic rod 13 is movably connected with the hinge seat 33 on the lower end surface of the operating table 1, and the lower end of the telescopic rod 13 is provided with a cone fixing part 1301, which is convenient for fixing on the slope. The lower end of the rod can be hinged with the circular plate, and when the fixing part of the cone is fixed, the existence of the circular plate facilitates the application of force. When in use, first determine the position of the operating table 1, then press the circular plate to insert the cone fixing part 1301 into the soil, and then adjust the telescopic rod 13 according to the slope, so that the operating table 1 is always on the horizontal plane.

A vertical adjusting rod 2 and a second motor 11 are arranged on the upper end of the operating table 1 , the lower end of the vertical adjusting rod 2 penetrates out of the operating table 1 and is fixed with a horizontal guide rail 3 . Horizontal sliding table 4, a horizontal plate 5 is arranged below the horizontal sliding table 4, two symmetrical supports 15 are arranged on the lower end surface of the horizontal plate 5, and a screw rod is arranged between the two supports 15 14. One end of the screw rod 14 is rotatably connected to one of the supports 15, and the other end penetrates the other support 15 and is connected to the third motor 12. The screw rod 14 is provided with a slider 6, and the slider The lower end of 6 is connected with a C-shaped mounting seat 7 through a connecting rod, and the C-shaped mounting seat 7 is provided with a cutting assembly. The output shaft of the second motor 11 is connected with a second gear 10 , and a side wall of the vertical adjustment rod 2 is provided with a first tooth slot 201 , and the first tooth slot 201 is engaged with the second gear 10 . The second gear 10 is driven by the second motor 11 to engage with the first tooth slot 201 to pull the vertical adjustment rod 2 to move up and down, so as to adjust the height of the cutting assembly to an appropriate position.

As shown in FIGS. 5 , 6 and 7 , two side walls of the horizontal guide rail 3 are provided with mutually symmetrical sliding grooves 301 , and an inverted L-shaped connecting block 401 is provided on one side of the upper end surface of the horizontal sliding table 4 . The horizontal part of the inverted L-shaped connecting block 401 is located in one of the sliding grooves 301 and can slide along the sliding groove 301. The inner wall of the other sliding groove 301 is provided with a second tooth groove 302 along its length direction. A first motor 403 and a support rod 405 are provided on the other side of the upper end surface of The upper end of the support rod 405 is provided with a T-shaped block 4051 , the T-shaped block 4051 is located in the T-shaped guide groove 4021 for guiding and pulling the turntable 402 , and a first gear 404 is provided above the first motor 403 , the first gear 404 meshes with the inner gear 4021 of the turntable 402 , and the outer ring gear 4022 of the turntable 402 meshes with the second tooth slot 302 . The first motor 403 is activated to drive the first gear 404 to engage with the inner gear 4021 to drive the turntable 402 to rotate, then the outer gear 4022 of the turntable 402 engages with the second tooth slot 302 to pull the horizontal slide table 4 to move along the chute.

In order to reduce the resistance received by the horizontal sliding table 4 moving along the horizontal guide rail 3, a through hole is provided in the horizontal part of the inverted L-shaped connecting block 401 through its height, and a compression spring 4012 and a baffle are arranged in the through hole. 4011, the central part of the compression spring 4012 is provided with a vertical section, the vertical section penetrates through the partition plate 4011, the two ends of the compression spring 4012 are respectively provided with balls 4013, and the balls 4013 are exposed on the outside of the through hole. It is in sliding contact with the upper and lower inner walls of the chute 301 .

In this embodiment, in order to realize the adjustment of the rotation angle of the cutting assembly, the upper end of the connecting rod 16 is rotatably connected to the lower end surface of the slider 6 , and the lower end of the connecting rod 16 is fixedly connected to the C-shaped mounting seat 7 . The connecting rod 16 is provided with a third gear 17, the lower end surface of the slider 6 is also provided with a fourth motor 18, the output shaft of the fourth motor 18 is connected with a fourth gear 19, and the fourth gear 19 is connected with The third gear 17 meshes. The fourth motor 18 is started, and the fourth gear 19 is driven to mesh with the third gear 17 to drive the connecting rod 16 to rotate, thereby realizing the rotation of the C-shaped mounting seat 7 .

As shown in FIGS. 8 , 9 , 10 and 11 , the cutting assembly includes a movable blade 8 and a fixed blade 9 . The movable blade 8 and the stationary blade 9 pass through the fixed rod 31 and the upper extension block 701 on the C-shaped mounting seat 7 . Connected to the lower extension block 702, the proximal end of the movable blade 8 is an arc edge and extends to the inside of the C-shaped mounting seat 7, the end of the arc-shaped edge is provided with first teeth 801, and the C-shaped mounting The seat 7 is provided with a first rotating rod 21, and the upper and lower ends of the first rotating rod 21 are respectively connected to the inner top wall and the inner bottom wall of the C-shaped mounting seat 7 in rotation. Five gears 20, the fifth gear 20 meshes with the first teeth 801, and a second rotating rod 28 and a third rotating rod 29 symmetrical to each other are provided on both sides of the first rotating rod 21. The two ends of the rod 28 and the third rotating rod 29 are respectively connected with the inner top wall and the inner bottom wall of the C-shaped mounting seat 7 in rotation, and the second rotating rod 28 and the third rotating rod 29 are respectively provided with a first disc 22 and the second disc 23, the outer walls of the first disc 22 and the second disc 23 are respectively provided with second teeth and third teeth, the number of teeth of the second and third teeth The rotation direction is the same. During the synchronous rotation of the first disk 22 and the second disk 23, the second teeth and the third teeth alternately mesh with the fifth gear 20, so as to realize the rotation of the fifth gear 20. The reciprocating rotation drives the first teeth to reciprocate and realize the opening and closing of the movable blade 8 in one cycle.

In order to realize the synchronous rotation of the first disk 22 and the second disk 23, a sixth gear 24 and a seventh gear are respectively provided on the second rotating rod 28 and the third rotating rod 29. The sixth gear and the seventh gear The gear 24 is connected by a belt 25, the third rotating rod 29 is also provided with a worm gear 26, the inner bottom wall of the C-shaped mounting seat 7 is also provided with a fifth motor 30, and the output shaft of the fifth motor 30 is also provided A worm 27 is connected, which meshes with the worm wheel 26 . When the fifth motor 30 is started, the worm 27 meshes with the worm wheel 26 to drive the third rotating rod 29 to rotate, thereby driving the seventh gear 24 to rotate, and the sixth gear is driven to rotate synchronously through the belt.

As shown in FIG. 12 , in this embodiment, the fixing rod 31 includes a spacer block 3101 , a polygonal segment 3102 , a smooth segment 3103 and a threaded segment 3104 from bottom to top, the lower extension block 702 and the fixed blade 9 are provided on There is a polygonal hole 901 that cooperates with each other, the polygonal segment 3102 is located in the polygonal hole 901, the mounting hole on the movable blade 8 is located on the smooth segment 3103 and can rotate along the smooth segment 3103, and the threaded segment 3104 extends through the upper The block is screwed to the fixing nut 32 .

When using, first determine the position of the operating table 1 (generally placed between two adjacent bushes), then press the circular plate to insert the cone fixing part 1301 into the soil, and then adjust the telescopic rod 13 according to the slope condition, so as to Make the console 1 always on a horizontal plane. Then start the second motor 11 to drive the second gear 10 to engage with the first tooth slot 201 to pull the vertical adjustment rod 2 to move up and down, thereby adjusting the height of the cutting assembly to an appropriate position; continue to start the first motor 403 to drive the first gear 404 to engage in the inner The ring gear 4021 drives the turntable 402 to rotate, then the outer gear 4022 of the turntable 402 meshes with the second tooth slot 302 to pull the horizontal slide table 4 to move along the slide slot, and adjust the front and rear position of the cutting assembly; continue to start the third motor 12, so that the slider 6 Move along the screw rod 14 to adjust the left and right positions of the cutting assembly; continue to start the fourth motor 18, drive the fourth gear 19 to engage the third gear 17 and drive the connecting rod 16 to rotate, thereby realizing the rotation of the C-shaped mounting seat 7 and realizing the angle adjustment of the cutting assembly. After the position of the cutting assembly is adjusted properly, and the trunk of the shrub is located between the movable blade 8 and the fixed blade 9, the fifth motor 30 is activated, and the movable blade 8 moves in the direction of the fixed blade 9, thereby completing the shrub cutting and maintaining the cutting surface. Smooth and neat. After cutting, the moving blade resets.

As shown in FIG. 13 , in this embodiment, a PVC pipe 34 or a shrub twig is rolled around the surrounding edge of the sunshade net, and then fixed with a fixing component. The fixing assembly includes an inverted U-shaped inserting rod 35, the upper end of which is connected with a knocking part 36. After the shade net is laid, four PVC pipes 34 or shrub branches are used to wrap around the four sides of the shade net. The inverted U-shaped rod 35 is inserted into the soil from the top of the PVC pipe 34 or the shrub branch. The inverted U-shaped rod 35 is installed vertically with the PVC pipe 34 or the shrub branch. When installing, it can be knocked with a hammer or stone. The striking part 36 is convenient to insert the inverted U-shaped plunger 35 into the soil.

In step 3, after 3 months of shading, the herbs under the shading net grow vigorously, while the new branches and buds of the shrubs are very few, and the new branches and buds are in a wilting state.

experiment

In the shrub expansion area of Yunwu Mountain in Ningxia, the experiment of shrub removal and shading was carried out. The results showed that after 3 months of shading, the incidence of new shoots of shrubs was only 20%, and showed a state of lack of green and wilting, and the herbs grew vigorously under the shading net, and shading did not affect their growth status. In contrast, when the unshaded area of the aboveground part of the shrub was removed, the incidence of new shoots of the shrub was 100%, and the growth state was good (Figure 2). After the shading net was removed at the beginning of the second growing season, the rate of new shoots of shrubs in the shaded area was only 5%, and the rate of new shoots of shrubs did not increase. The shading effect continued to be obvious, which had a good effect on the restoration of vegetation in the shrubland area. .

The above is only used to illustrate the technical solution of the present invention and not to limit it. Other modifications or equivalent replacements made by those of ordinary skill in the art to the technical solution of the present invention, as long as they do not depart from the spirit and scope of the technical solution of the present invention, should be Included within the scope of the claims of the present invention.

Claims (8)

1. a biological control method for the expansion of shrubby grassland shrubs in loess area, is characterized in that, comprises the following steps: Step 1: At the beginning of the growth season of the shrubland grassland in the loess area, use a shrub cutting device to remove the above-ground growing parts of the shrubs, grasslands and shrubs; Step 2: Use 10-pin density black shade net to cover the area where the aboveground part of the shrub is cut off, and fix the surrounding area of the shade net; Step 3: After 3 months of shading, open the sunshade net to manually remove the new branches and buds in the cut part of the shrub, continue to fix the sunshade net after 2 days, and after repeating 2 times, basically no new branches and buds appear on the shrub; Step 4: The shade net is removed at the beginning of the second growing season, and the number of new shoots of the shrub has dropped to a very low level; Step 5: In the shade shrub area, combined with the growth of herbs, appropriate amount of forage grass is supplemented to improve the nutrient competitive advantage of herbs; In step 1, the shrub cutting device includes an operating table, at least three telescopic rods are arranged on the lower end surface of the operating table along its circumferential direction, the upper ends of the telescopic rods are movably connected with the hinge seat on the lower end surface of the operating table, and the operating table The upper end of the vertical adjustment rod is provided with a vertical adjustment rod, and the lower end of the vertical adjustment rod penetrates out of the operating table and is fixed with a horizontal guide rail. The lower end surface of the horizontal plate is provided with two symmetrical supports, a screw rod is arranged between the two supports, one end of the screw rod is rotatably connected with one of the supports, and the other end penetrates the other The support is connected with the third motor, a slider is arranged on the screw rod, the lower end of the slider is connected with a C-type mounting seat through a connecting rod, and a cutting assembly is arranged on the C-type mounting seat; The cutting assembly includes a movable blade and a fixed blade, the movable blade and the fixed blade are connected with the upper and lower extension blocks on the C-shaped mounting seat through a fixed rod, and the proximal end of the movable blade is an arc edge and extends To the inside of the C-shaped mounting seat, the end of the arc-shaped side is provided with first teeth, the inside of the C-shaped mounting seat is provided with a first rotating rod, and the upper and lower ends of the first rotating rod are respectively installed with the C-shaped mounting seat. The inner top wall and the inner bottom wall of the seat are rotatably connected, the first rotating rod is provided with a fifth gear, the fifth gear is meshed with the first teeth, and the two sides of the first rotating rod are also provided with mutually symmetrical The second rotating rod and the third rotating rod, the two ends of the second rotating rod and the third rotating rod are respectively rotatably connected with the inner top wall and the inner bottom wall of the C-type mounting seat, and the second rotating rod and the third rotating rod are respectively rotatably connected. A first disc and a second disc are respectively set on the three rotating rods, and second teeth and third teeth are respectively set on the outer walls of the first disc and the second disc. The second teeth and the third teeth are respectively meshed with the fifth gear; The second rotating rod and the third rotating rod are also provided with a sixth gear and a seventh gear respectively, the sixth gear and the seventh gear are connected by a belt, and a worm gear is also set on the third rotating rod, so the A fifth motor is also arranged on the inner bottom wall of the C-shaped mounting seat, and the output shaft of the fifth motor is connected with a worm, and the worm is engaged with the worm wheel. 2 . The biological control method for the expansion of shrubby grasslands in a loess area according to claim 1 , wherein the upper end surface of the operating table is provided with a second motor, and the output shaft of the second motor is connected to the output shaft of the second motor. 3 . There is a second gear, the side wall of the vertical adjustment rod is provided with a first tooth slot, and the first tooth slot is engaged with the second gear. 3. The biological control method for the expansion of shrubby grassland in a loess area according to claim 1, wherein the two side walls of the horizontal guide rail are provided with mutually symmetrical chutes, and the horizontal sliding platform An inverted L-shaped connecting block is arranged on one side of the upper end face of the sled, the horizontal part of the inverted L-shaped connecting block is located in one of the chute, and can slide along the chute, and the inner wall of the other chute is arranged along its length direction. The second tooth slot, the other side of the upper end surface of the horizontal sliding table is provided with a first motor and a support rod, the upper end of the support rod is provided with a turntable, and the lower end surface of the turntable is provided with a T-shaped guide along its circumferential direction. The upper end of the support rod is provided with a T-shaped block, the T-shaped block is located in the T-shaped guide groove, a first gear is provided above the first motor, and the first gear is connected to the inner gear of the turntable. The outer ring gear of the turntable meshes with the second tooth slot, the first motor drives the first gear to rotate, and the first gear drives the turntable to rotate, then the turntable moves along the second tooth slot and drives the horizontal slide table along the horizontal Rails move. 4. a kind of biological control method for the expansion of shrubby steppe shrubs in a loess area according to claim 3, is characterized in that, the horizontal part of described inverted L-shaped connecting block is provided with the through hole penetrating its height, A compression spring and a partition are arranged in the hole, a vertical section is arranged in the center of the compression spring, the vertical section penetrates the partition, and balls are respectively arranged at both ends of the compression spring, and the balls are exposed outside the through hole The part is in sliding contact with the upper and lower inner walls of the chute. 5. The biological control method for the expansion of shrubby grassland in a loess area according to claim 1, wherein the upper end of the connecting rod is rotatably connected with the lower end face of the slider, and the lower end of the connecting rod is connected with the C type mounting seat is fixedly connected, the connecting rod is provided with a third gear, the lower end face of the slider is also provided with a fourth motor, the output shaft of the fourth motor is connected with a fourth gear, the fourth gear mesh with the third gear. 6. a kind of biological control method for the expansion of shrubs in loess area shrubby grassland according to claim 1, is characterized in that, described fixed rod comprises the pad block, polygonal section, smooth section and threaded section from bottom to top, so The lower extension block and the fixed blade are provided with a polygonal hole that cooperates with each other, the polygonal segment is located in the polygonal hole, the mounting hole on the movable blade is located on the smooth segment and can rotate along the smooth segment, and the threaded segment penetrates out. The upper extension block is threadedly connected with the fixing nut. 7. the biological control method of a kind of loess area shrubby steppe shrub expansion according to claim 1, is characterized in that, in step 2, rolls a PVC pipe or shrub twig on the surrounding edge of sunshade net, and then uses Fix the components to be fixed. 8. the biological control method of a kind of loess area shrubby steppe shrub expansion according to claim 1, is characterized in that, in step 3, after shading for 3 months, the herbaceous plants grow vigorously under the sunshade net, and the shrubs are new. There are very few branch buds, and the new branch buds are wilted.

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