A soil sample collection device and collection method for grassland ecological restoration

Abstract

The invention provides a soil sample collection device and a collection method for grassland ecological restoration, which relate to the technical field of soil sample collection, and include a drill frame, a straightening seat, a drill pipe, a sampling seat pipe and a driving member, wherein the straightening seat can be vertically slidably arranged on the drill frame, the straightening seat is rotatably sleeved on the drill pipe, the driving member is arranged on the drill frame, and the driving member is used to drive the drill pipe to rotate; a sampling seat pipe is coaxially rotatably arranged in the drill pipe; the drill pipe includes an inner pipe, an outer pipe, a soil-scraping member and a sampling drill bit, a plurality of soil-scraping members are arranged around the drill pipe, the sampling drill bit is arranged at the lower end of the drill pipe, and the outer pipe is coaxially sleeved on the inner pipe; the soil-scraping member includes a planing claw, a guide rod and a sliding sleeve, an inner slot hole is arranged on the inner pipe, an outer slot hole corresponding to the inner slot hole is arranged on the outer pipe, one end of the guide rod is hinged with the inner slot hole, and the other end of the guide rod is connected with the planing claw, the sliding sleeve is slidably sleeved on the guide rod, and the sliding sleeve is hinged with the outer slot hole; the problems of time-consuming, labor-consuming and low efficiency when sampling underground soil samples are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of soil sample collection, and in particular to a soil sample collection device and a soil sample collection method for grassland ecological restoration. Background Art

[0002] Due to the influence of natural and human factors, wetlands in the region have experienced varying degrees of degradation in recent decades. Overgrazing, soil erosion, grassland desertification caused by exposed soil, grassland rodents, insects, toxic weeds and other grassland degradation problems affect the surrounding grasslands and form a circular effect, which may lead to secondary grassland degradation and cause disasters with great destructive effects on the grassland: first, it leads to a rapid reduction in high-quality grasslands; second, the floating soil of the black soil beach is blown away by the wind in winter, which will affect the soil of the entire grassland and the lives of herders; directly resulting in cattle and sheep having no grass to eat, and herders being unable to graze. Therefore, the selection of the main research objects of comprehensive management of wetland degradation and comprehensive management of grassland degradation has great reference significance and scientific guidance for the ecological restoration of landscape engineering.

[0003] In order to compare the changes before and after ecological restoration, it is necessary to select a reference ecosystem that is similar to the restoration area but has not been restored as the benchmark and control for ecological restoration. In order to investigate and monitor the ecological restoration area and the reference ecosystem, it is necessary to set up a certain number and scale of sample plots and sample plots between the two to obtain data on various ecological indicators. According to different ecological types and survey purposes, observation, measurement, counting, sampling and other methods were used to investigate and sample hydrology, soil, vegetation, biomass and other indicators in the sample plots and sample plots. It is mainly a survey of aboveground biomass and underground biomass. The survey of aboveground biomass can be carried out by harvesting method, while the survey of underground biomass mostly adopts soil drilling method, and the original soil is collected by ring knife method to measure the soil moisture content, porosity, bulk density and soil organic carbon storage. When sampling underground soil for testing, the efficiency is low, especially the ring knife method of sampling, which requires the ring knife to be vertically aligned with the ground surface, the ring knife handle to be aligned with the ring knife, and then hammered until the ring knife handle is close to the ground surface; remove the ring knife handle, dig out the ring knife with a small shovel, and use a soil knife to scrape off excess soil; when using the ring knife method to sample different depths at the same sampling site, a larger amount of excavation is required, which is not only time-consuming and labor-intensive, but also inefficient. Summary of the invention

[0004] The purpose of the present invention is to provide a soil sample collection device and collection method for grassland ecological restoration, which solves the problems that underground soil sample sampling is not only time-consuming and labor-intensive, but also inefficient.

[0005] The present invention is realized by the following technical scheme: a soil sample collection device for grassland ecological restoration, comprising a drill frame, a straightening seat, a drill pipe, a sampling seat tube and a driving member, wherein the straightening seat can be vertically slidably arranged on the drill frame, the straightening seat is rotatably sleeved on the drill pipe, the driving member is arranged on the drill frame, and the driving member is used to drive the drill pipe to rotate; the sampling seat tube is coaxially rotatably arranged in the drill pipe;

[0006] The drill pipe comprises an inner pipe, an outer pipe, a soil-scraping piece and a sampling drill bit. A plurality of soil-scraping pieces are arranged around the drill pipe. The sampling drill bit is arranged at the lower end of the drill pipe. The outer pipe is coaxially sleeved on the inner pipe.

[0007] The soil-digging component includes a digging claw, a guide rod and a sliding sleeve. The inner tube is provided with an inner slot hole, and the outer tube is provided with an outer slot hole corresponding to the inner slot hole. One end of the guide rod is hinged to the inner slot hole, and the other end of the guide rod is connected to the digging claw. The sliding sleeve is slidably mounted on the guide rod, and the sliding sleeve is hinged to the outer slot hole.

[0008] The guide rod is rotatably provided with a connecting head at one end close to the inner slot hole, and the connecting head is hinged to the inner slot hole;

[0009] A guide groove is obliquely arranged on the guide rod, a guide sliding key is arranged on the sliding sleeve, and the lower end of the guide sliding key is placed in the guide groove.

[0010] A plurality of through holes are arranged in a circular array between the sampling drill bit and the drill pipe, a cutting knife is arranged in the through hole, a long slot hole is opened on the cutting knife, one end of the cutting knife is hinged to the lower end of the outer tube, a guide pin is arranged at the lower end of the inner tube, and the guide pin is slidably placed in the long slot hole.

[0011] A plurality of limiting slots are arranged in an annular array on the outer tube, and a plurality of limiting rods are arranged in an annular array on the outer wall of the inner tube. The limiting rods are slidably placed in the limiting slots.

[0012] The straightening seat comprises a straightening ring and a sliding block, and a plurality of the sliding blocks are arranged in a circular array on the outer wall of the straightening ring; a plurality of sliding grooves are arranged vertically on the drilling frame, and the plurality of the sliding blocks are slidably placed in the plurality of the sliding grooves respectively;

[0013] An annular main guide rail is arranged on the inner wall of the straightening ring, and a plurality of first rollers are arranged in an annular array on the outer wall of the outer tube, and the plurality of first rollers are rotatably placed on the main guide rail.

[0014] The straightening seat further comprises an upper clamping ring, a lower clamping ring and a plurality of adjusting rods, wherein the upper clamping ring and the lower clamping ring are symmetrically arranged on the upper and lower sides of the straightening ring, and the plurality of adjusting rods are vertically rotatably arranged on the straightening ring, and the upper and lower ends of the adjusting rod are respectively provided with a first thread and a second thread, the first thread is threadably connected to the upper clamping ring, the second thread is threadably matched to the lower clamping ring, and the thread directions of the first thread and the second thread are opposite;

[0015] A wavy upper guide rail is disposed around the bottom of the upper clamping ring near the outer tube, and a wavy lower guide rail is disposed around the top of the lower clamping ring near the outer tube, and an annular wave guide groove is formed between the upper guide rail and the lower guide rail;

[0016] A second roller is coaxially arranged between the first roller and the outer tube, and the second roller is rotatably placed in the wave guide groove.

[0017] It also includes a positioning pin, a plurality of first pin holes are vertically spaced in the slide groove, and a second pin hole is arranged on the slide block. When the positioning pin passes through the first pin hole and the second pin hole at the same time, the straightening seat is fixed to the drill frame.

[0018] The driving member comprises a driving handle, a shaft tube, a driving rod, a connecting sleeve and a reducer, wherein the shaft tube is vertically arranged on the drilling frame, the shaft tube is rotatably connected to the drilling frame, the driving handle is arranged on the shaft tube, the driving rod is slidably passed through the shaft tube, a driving sleeve is sleeved on the driving rod, the driving sleeve is connected to the driving rod with a sliding key, and the shaft tube is drivingly connected to the driving sleeve through the reducer;

[0019] The lower end of the driving rod is connected to the connecting sleeve, and the upper end of the inner tube is placed in the connecting sleeve and spline-connected to the connecting sleeve;

[0020] The reducer comprises a sun gear, a planet carrier, planetary gears and a ring gear, wherein the sun gear is sleeved on the lower end of the shaft tube, the planet carrier is sleeved on the driving sleeve, a plurality of planetary gears are arranged in an annular array on the planet carrier, the ring gear is arranged on the drilling frame, and the planetary gears are meshed with the ring gear and the sun gear at the same time;

[0021] The drilling frame is also provided with a limit seat, the limit seat sleeve is arranged on the driving sleeve, the driving sleeve and the limit seat are loosely matched, and the driving sleeve is also sleeved with a first thrust bearing, and the upper and lower ends of the first thrust bearing are respectively in contact with the planet carrier and the limit seat;

[0022] A weight block is arranged on the upper end of the driving rod.

[0023] A limiting ring is provided at the lower end of the sampling seat tube, and the inner diameter of the limiting ring is smaller than the inner diameter of the sampling seat tube;

[0024] The inner cavity of the sampling seat tube is stacked with staggered sampling rings and compensation tubes, the upper end of the sampling seat tube is threadedly connected with a cover, the cover is threadedly matched with a limit screw, the lower end of the limit screw is rotatably connected to a limit plate, and the limit plate is slidably placed in the sampling seat tube;

[0025] The upper end of the limiting screw rod is in contact with the connecting sleeve via a second thrust bearing.

[0026] A soil sample collection method for grassland ecological restoration, using a soil sample collection device for grassland ecological restoration, comprises the following steps:

[0027] S1. Select several typical and representative sampling sites in the area to be restored, and select three small sample plots along the 0°, 120°, and 240° directions of the center of the circle within the sampling site. The three small sample plots should be no less than 40 meters away from the center of the circle;

[0028] S2. Record the location, time, weather and other information of the sample plots and quadrat, as well as the sampling methods, tools and instrument parameters used; record the slope, management method and soil type within the small sample plot;

[0029] S3, using the harvesting method to obtain all plants and litter above the ground in the sample plot;

[0030] S4, setting the drill frame in the sample plot, setting the sampling rings in the sampling seat tube at three depth levels of 0-20 cm, 20-40 cm, and 40-100 cm, and the distance between adjacent sampling rings is achieved by setting the compensation tubes of different lengths;

[0031] The driving handle is rotated forward to drive the driving rod to rotate through the reducer, and the driving rod acts on the drill pipe through the connecting sleeve. Under the downward pressure of the weight block and the self-rotation of the drill pipe, the drill pipe carries the sampling seat tube and drills downward until the target depth is reached;

[0032] The positioning pin is passed through the first pin hole and the second pin hole at the same time, and then the driving handle is rotated in the opposite direction, so that the inner tube and the outer tube rotate relatively, and the planing claws are slowly spread outwards as the drill pipe rotates, so as to loosen the side wall of the soil where the drill pipe is located, and at the same time, the cutting knife is spread outwards, and the cutting knife cuts the soil entering the sampling seat tube and the original soil below as the drill pipe rotates, so as to separate the two;

[0033] After the side wall of the soil is loosened, the adjusting rod is driven to rotate, so that the upper clamping ring and the lower clamping ring move toward each other, and the driving handle is continuously rotated in the opposite direction, so that the drill pipe drives the planing claw to move up and down while rotating, so as to further loosen the soil, and then the positioning pin is pulled out of the first pin hole and the second pin hole, the drill pipe is pulled out, and the samples in the plurality of sampling rings are taken out;

[0034] The drilled hole at the sampling location was then backfilled;

[0035] S5. Take soil samples from each sample plot three times at each depth level, then mix the soil samples at the same level, rinse with water, and separate the plant roots;

[0036] S6. Repeat step S4, taking soil samples from each sample plot three times at each depth level, and measuring soil physical properties, such as soil moisture content, porosity and bulk density parameters;

[0037] S7. Collect loose soil and calculate soil organic carbon storage.

[0038] The technical solution of the present invention has at least the following advantages and beneficial effects:

[0039] 1. When the inner tube rotates in the outer tube to unfold the planing claws, the sleeve slides on the guide rod. After the planing claws leave the outer slot, the guide key begins to enter the guide slot. As the sleeve moves further toward the connector, the guide key drives the guide rod to rotate a certain angle in the sleeve, so that the planing claws rotate within a certain range when they are further unfolded outward, usually about 100 degrees, so that the planing claws are tilted, thereby expanding the planing range of the planing claws. By controlling the expansion of the planing claws, the sampling hole can be expanded as the drill pipe rotates, which is convenient for the drill pipe to drill down and take out, especially when taking out, it can not only reduce the friction of the soil on the drill pipe, but also when the drill pipe is pulled out, the loosened soil can initially backfill the hole, which not only improves the sampling efficiency, but also facilitates the backfilling of the sampling point, greatly improving the overall sampling work.

[0040] 2. When the inner tube rotates relative to the outer tube, the distance between the guide pin and the hinge between the cutting knife and the inner tube changes, and then the guide pin slides in the long slot hole, and at the same time drives the cutting knife to expand inward. As the drill pipe rotates as a whole, the cutting knife cuts the internal soil sample to separate the soil sample from the original soil below, making it easier to remove the sample. At the same time, the expanded cutting knife can also limit the soil sample taken from the inside of the drill pipe, so that when the drill pipe is removed, the soil sample is not easy to fall out of the sampling seat tube.

[0041] 3. When it is difficult to drill in or out of the drill hole, first insert the positioning pin into the first pin hole at the current height, and insert it into the second pin hole at the same time to fix the straightening ring and the drill frame, then rotate several adjustment rods to move the upper clamping ring and the lower clamping ring towards each other, so that the upper guide rail and the lower guide rail are close to each other, until the lowest point of the lower guide rail is flush with or slightly higher than the main guide rail, but the upper guide rail and the lower guide rail cannot contact the second roller at the same time, and then drive the drill pipe to rotate again, and the second roller moves between the wave guide rails formed between the upper guide rail and the lower guide rail, so that The drill rod reciprocates vertically, and the lower guide rail is mainly used to lift the second roller, while the upper guide rail is mainly used to lower the second roller, so as to reduce the friction between the drill rod and the soil. At the same time, with the unfolded planing claws, the side wall of the drill hole can be loosened to further reduce the friction between the drill hole and the drill pipe, making it easier to drill in or pull out the drill pipe. At the same time, after the drill hole is enlarged and loosened, after the drill pipe is pulled out, the loosened soil will accumulate at the bottom of the hole to achieve preliminary backfilling. The backfilling of the drill hole can be completed by simply filling it up, avoiding the drill hole from causing harm to passers-by or animals. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0043] Figure 1 A schematic diagram of the cross-sectional structure of a soil sample collection device for grassland ecological restoration used in a soil sample collection method and a soil sample collection device for grassland ecological restoration provided by the present invention when digging the soil after drilling to a target depth;

[0044] Figure 2 for Figure 1 A magnified schematic diagram of the structure at center A;

[0045] Figure 3 for Figure 2 A magnified schematic diagram of the structure at D in the middle;

[0046] Figure 4 for Figure 1 A magnified schematic diagram of the structure at B in the middle;

[0047] Figure 5 for Figure 1 A magnified schematic diagram of the structure at C in the middle;

[0048] Figure 6 for Figure 1 Structural diagram of the cross-section structure at EE in the middle;

[0049] Figure 7 for Figure 1 Structural diagram of the cross-section structure at FF in the middle;

[0050] Icons: 1. Drilling frame, 11. Slide, 111. First pin hole, 12. Positioning pin, 13. Limit seat, 14. Anchor foot, 2. Straightening seat, 21. Straightening ring, 211. Main guide, 22. Sliding block, 221. Second pin hole, 23. Upper clamping ring, 231. Upper guide, 24. Lower clamping ring, 241. Lower guide, 25. Adjusting rod, 251. First thread, 252. Second thread, 26. Wave guide, 3. Drill pipe, 31. Inner pipe, 311. Inner slot, 312. Limit rod, 32. Outer pipe, 321. Outer slot, 322. Limit slot, 323. First roller, 324. Second roller, 33. Digging piece, 331. Digging claw, 332. Guide rod, 3321, guide groove, 333, sliding sleeve, 334, connecting head, 335, guide sliding key, 34, sampling drill bit, 35, through hole, 36, cutting knife, 361, long slot hole, 362, guide pin, 4, sampling seat tube, 41, limiting ring, 42, sampling ring, 43, compensation tube, 44, sealing cover, 45, limiting screw, 46, limiting plate, 47, second thrust bearing, 5, driving part, 51, driving handle, 52, shaft tube, 53, driving rod, 531, weight block, 54, connecting sleeve, 55, reducer, 551, sun gear, 552, planetary carrier, 553, planetary gear, 554, ring gear, 555, first thrust bearing, 56, driving sleeve. DETAILED DESCRIPTION

[0051] In order to make the purpose, 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 in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0052] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0053] Reference Figures 1 to 7As shown, this embodiment provides a soil sample collection device for grassland ecological restoration, including a drill frame 1, a straightening seat 2, a drill pipe 3, a sampling seat tube 4 and a driving member 5. The straightening seat 2 can be vertically slidably arranged on the drill frame 1, the straightening seat 2 is rotatably sleeved on the drill pipe 3, and the driving member 5 is arranged on the drill frame 1. The driving member 5 is used to drive the drill pipe 3 to rotate; a sampling seat tube 4 is coaxially rotatably arranged in the drill pipe 3;

[0054] When implementing it, Figure 1 As shown, the drill rig 1 is vertically arranged on the ground, and a plurality of anchor feet 14 are hinged on the drill rig 1. When installing the drill rig 1, the drill rig 1 is initially vertically inserted into the soil after leveling the ground, and then the anchor feet 14 are unfolded. When the soil is hard, the anchor feet 14 can be further fixed to the ground by anchor nails, etc. During the drilling process, one person can stand on the anchor feet 14, or multiple people can stand on different anchor feet 14 respectively, to enhance the stability of the drill rig 1.

[0055] The drill pipe 3 includes an inner pipe 31, an outer pipe 32, a soil-scraping piece 33 and a sampling drill bit 34. A plurality of soil-scraping pieces 33 are arranged around the drill pipe 3. The sampling drill bit 34 is arranged at the lower end of the drill pipe 3. The sampling drill bit 34 is connected to the inner pipe 31. The outer pipe 32 is coaxially sleeved on the inner pipe 31.

[0056] More specifically, Figure 1 , Figure 3 , Figure 5 and Figure 7 As shown, the soil-digging member 33 includes a digging claw 331, a guide rod 332 and a sliding sleeve 333. The inner tube 31 is provided with an inner slot hole 311, and the outer tube 32 is provided with an outer slot hole 321 corresponding to the inner slot hole 311. One end of the guide rod 332 is hinged to the inner slot hole 311, and the other end of the guide rod 332 is connected to the digging claw 331. The sliding sleeve 333 is slidably sleeved on the guide rod 332, and the sliding sleeve 333 is hinged to the outer slot hole 321. Furthermore, by controlling the relative rotation of the inner tube 31 and the outer tube 32, that is, the inner tube 31 rotates inside the outer tube 32, the expansion or contraction of the planing claw 331 can be controlled. When the planing claw 331 contracts, the outer groove hole 321 can completely accommodate the planing claw 331. By controlling the planing claw 331 to expand, the sampling hole can be enlarged as the drill pipe 3 rotates, which facilitates the downward drilling and removal of the drill pipe 3. Especially when removing the drill pipe 3, not only can the friction of the soil on the drill pipe 3 be reduced, but also when the drill pipe 3 is pulled out, the loosened soil can be used to initially backfill the hole, which not only improves the sampling efficiency, but also facilitates the backfilling of the sampling point, thereby greatly improving the overall sampling work.

[0057] More specifically, Figure 3As shown, a connecting head 334 is coaxially rotatably provided at one end of the guide rod 332 close to the inner slot hole 311, and the connecting head 334 is hinged to the inner slot hole 311; a guide groove 3321 is obliquely provided on the guide rod 332, and a guide sliding key 335 is provided on the sliding sleeve 333, and the lower end of the guide sliding key 335 is placed in the guide groove 3321. During specific implementation, when the inner tube 31 rotates in the outer tube 32 to unfold the planing claw 331, the sliding sleeve 333 slides on the guide rod 332. After the planing claw 331 leaves the outer groove hole 321, the guide sliding key 335 begins to enter the guide groove 3321. As the sliding sleeve 333 further moves toward the side of the connecting head 334, the guiding sliding key 335 drives the guide rod 332 to rotate a certain angle in the sliding sleeve 333, so that the planing claw 331 rotates within a certain range when further unfolding outward, usually rotating about 30 degrees, so that the planing claw 331 is in an inclined state, thereby expanding the digging range of the planing claw 331.

[0058] At the same time, if Figure 1 and Figure 6 As shown, a plurality of through holes 35 are arranged in a circular array between the sampling drill bit 34 and the drill pipe 3, and a cutting knife 36 is arranged in the through hole 35. The cutting knife 36 is provided with a long slot hole 361. One end of the cutting knife 36 is hinged to the lower end of the outer tube 32, and a guide pin 362 is arranged at the lower end of the inner tube 31. The guide pin 362 is slidably placed in the long slot hole 361. In specific implementation, when the inner tube 31 rotates relative to the outer tube 32, the distance between the guide pin 362 and the hinge between the cutting knife 36 and the inner tube 31 changes, and then the guide pin 362 slides in the long slot hole 361, and at the same time drives the cutting knife 36 to expand inwardly. As the drill pipe 3 rotates as a whole, the cutting knife 36 cuts the soil sample inside, so that the soil sample is separated from the original soil below, which is convenient for sample removal. At the same time, the expanded cutting knife 36 can also limit the soil sample taken from the inside of the drill pipe 3, so that when the drill pipe 3 is removed, the soil sample is not easy to be separated from the sampling seat tube 4.

[0059] More specifically, Figure 1 and Figure 3 As shown, a plurality of limiting slots 322 are arranged in an annular array on the outer tube 32, and a plurality of limiting rods 312 are arranged in an annular array on the outer wall of the inner tube 31, and the plurality of limiting rods 312 are slidably placed in the limiting slots 322. In specific implementation, when the planing claws 331 and the cutting blade 36 are in the initial contracted state, the limiting rods 312 are located at one end of the limiting slots 322, and when the inner tube 31 rotates relative to the outer tube 32 until the planing claws 331 and the cutting blade 36 are fully deployed, the limiting rods 312 move to the other end of the limiting slots 322, so that the planing claws 331 and the cutting blade 36 will not be excessively deployed; at the same time, when the inner tube 31 drives the outer tube 32 to rotate, and then the entire drill pipe 3 rotates, the limiting rods 312 and the limiting slots 322 cooperate to make the outer tube 32 and the inner tube 31 rotate synchronously.

[0060] like Figure 1-Figure 3 As shown, the straightening seat 2 includes a straightening ring 21 and a slider 22. A plurality of sliders 22 are arranged in a circular array on the outer wall of the straightening ring 21. A plurality of slide grooves 11 are vertically arranged on the drill rig 1, and a plurality of sliders 22 are respectively slidably placed in the plurality of slide grooves 11. The slide grooves 11 are used to limit and guide the sliders 22, and also include positioning pins 12. A plurality of first pin holes 111 are vertically spaced in the slide grooves 11, and a second pin hole 221 is arranged on the slider 22. When the positioning pin 12 passes through the first pin hole 111 and the second pin hole 221 at the same time, the straightening seat 2 is fixed to the drill rig 1, thereby providing support for the drill pipe 3.

[0061] An annular main guide rail 211 is provided on the inner wall of the straightening ring 21, and a plurality of first rollers 323 are provided in an annular array on the outer wall of the outer tube 32, and the plurality of first rollers 323 are rolled on the main guide rail 211. In specific implementation, the first rollers 323 are tapered, and when the drill pipe 3 is drilling downward, the first rollers 323 cooperate with the main guide rail 211 to guide the drill pipe 3.

[0062] More specifically, Figure 3 As shown, the straightening seat 2 also includes an upper clamping ring 23, a lower clamping ring 24 and a plurality of adjusting rods 25. The upper clamping ring 23 and the lower clamping ring 24 are symmetrically arranged on the upper and lower sides of the straightening ring 21. The plurality of adjusting rods 25 are vertically rotatably arranged on the straightening ring 21. The upper and lower ends of the adjusting rod 25 are respectively provided with a first thread 251 and a second thread 252. The first thread 251 is threadedly connected to the upper clamping ring 23, and the second thread 252 is threadedly matched with the lower clamping ring 24. The thread directions of the first thread 251 and the second thread 252 are opposite; an adjusting handle is provided on the top of the first thread 251 for conveniently driving the adjusting rod 25 to rotate.

[0063] A wavy upper guide rail 231 is disposed around the bottom of the upper clamp ring 23 near the outer tube 32, and a wavy lower guide rail 241 is disposed around the top of the lower clamp ring 24 near the outer tube 32. An annular wave guide groove 26 is formed between the upper guide rail 231 and the lower guide rail 241.

[0064] A second roller 324 is coaxially disposed between the first roller 323 and the outer tube 32 , and the second roller 324 is rotatably disposed in the wave guide groove 26 .

[0065] When implementing it, Figure 1-Figure 5As shown, when it is difficult for the drill pipe 3 to drill in or out of the drill hole, the positioning pin 12 is first inserted into the first pin hole 111 at the current height, and at the same time inserted into the second pin hole 221 to fix the straightening ring 21 to the drill frame 1, and then the plurality of adjusting rods 25 are rotated to make the upper clamping ring 23 and the lower clamping ring 24 move toward each other, so that the upper guide rail 231 and the lower guide rail 241 are brought closer to each other, until the lowest point of the lower guide rail 241 is flush with or slightly higher than the main guide rail 211, but the upper guide rail 231 and the lower guide rail 241 cannot abut against the second roller 324 at the same time, and the drill pipe 3 is driven to rotate again, and the second roller 324 is moved between the upper guide rail 231 and the lower guide rail 241. The lower guide rail 241 is mainly used for lifting the second roller 324, while the upper guide rail 231 is mainly used for lowering the second roller 324, so as to reduce the friction between the drill rod and the soil. At the same time, with the unfolded planing claw 331, the side wall of the drill hole can be loosened, and the friction between the drill hole and the drill pipe 3 can be further reduced, so as to facilitate the drilling or pulling out of the drill pipe 3. At the same time, after the drill hole is enlarged and loosened, after the drill pipe 3 is pulled out, the loosened soil will be accumulated at the bottom of the hole to achieve preliminary backfilling. The backfilling of the drill hole can be completed by simply filling it, so as to avoid the drill hole causing harm to passers-by or animals.

[0066] like Figure 1 and Figure 4 As shown, the driving member 5 includes a driving handle 51, a shaft tube 52, a driving rod 53, a connecting sleeve 54 and a reducer 55. The shaft tube 52 is vertically arranged on the drill frame 1, and the shaft tube 52 is rotatably connected to the drill frame 1. The driving handle 51 is sleeved on the shaft tube 52 to drive the shaft tube 52 to rotate; at the same time, the driving rod 53 is slidably inserted through the shaft tube 52, and a driving sleeve 56 is sleeved on the driving rod 53. The driving sleeve 56 is connected to the driving rod 53 by a sliding key, and the shaft tube 52 is connected to the driving sleeve 56 through the reducer 55; thus, the driving rod 53 can move up and down in the shaft tube 52 and the driving sleeve 56, and at the same time, it is driven The sleeve 56 drives to rotate along its axis, the lower end of the driving rod 53 is connected to the connecting sleeve 54, the upper end of the inner tube 31 is placed in the connecting sleeve 54 and spline-connected with the connecting sleeve 54, and the connecting sleeve 54 can be fixedly connected to the inner tube 31 when necessary, by providing coaxial locking holes on the connecting sleeve 54 and the inner tube 31, and inserting locking pins in the locking holes, thereby limiting the axial displacement of the connecting sleeve 54 and the inner tube 31; when the driving rod 53 rotates, the inner tube 31 is driven to rotate through the connecting sleeve 54, and the inner tube 31 drives the outer tube 32 to rotate through the limiting rod 312 and the limiting slot 322, thereby driving the drill pipe 3 to rotate.

[0067] More specifically, Figure 4As shown, the reducer 55 includes a sun gear 551, a planet carrier 552, a planet gear 553 and a ring gear 554. The sun gear 551 is sleeved on the lower end of the shaft tube 52, the planet carrier 552 is sleeved on the driving sleeve 56, a plurality of planet gears 553 are arranged in an annular array on the planet carrier 552, and the ring gear 554 is arranged on the drilling rig 1. The planet gear 553 is meshed with the ring gear 554 and the sun gear 551 at the same time;

[0068] A limit seat 13 is also provided on the drilling rig 1. The limit seat 13 is sleeved on the driving sleeve 56. The driving sleeve 56 and the limit seat 13 are clearance-matched. A first thrust bearing 555 is also sleeved on the driving sleeve 56. The upper and lower ends of the first thrust bearing 555 are respectively in contact with the planet carrier 552 and the limit seat 13; it is used to limit the planet carrier 552 and ensure that the planet gear 553 can always mesh with the sun gear 551 and the ring gear 554.

[0069] More specifically, Figure 1 and Figure 4 As shown, a weight block 531 is provided at the upper end of the driving rod 53. The weight block 531 can be provided in multiple groups, and can be a heavier steel ingot or a sandbag filled on site, or a receiving basin can be connected to the upper end of the driving rod 53, and stones or soil can be filled in the basin on site; in short, the weight block 531 is mainly used to provide downward pressure to the driving rod 53, and then provide downward pressure to the drill pipe 3, and cooperate with the drill pipe 3 to be driven to rotate by the driving rod 53, so that the drill pipe 3 rotates and drills downward. The weight setting method on the driving rod 53 is not unique, and other structures or devices can be used to provide downward pressure, but it cannot interfere with its rotation.

[0070] More specifically, Figure 1 , Figure 5 and Figure 6 As shown, the lower end of the sampling seat tube 4 abuts against the sampling drill bit 34, and the abutment does not interfere with the contraction of the cutting knife 36. A limit ring 41 is provided at the lower end of the sampling seat tube 4, and the inner diameter of the limit ring 41 is smaller than the inner diameter of the sampling seat tube 4;

[0071] The inner cavity of the sampling seat tube 4 is stacked with staggered sampling rings 42 and compensation tubes 43. The inner diameters of the sampling rings 42 and the compensation tubes 43 are consistent and do not exceed 10 cm. The ends of the compensation tubes 43 that abut the sampling rings 42 are provided with grooves. After the sampling is completed, a soil knife can be inserted from the groove and rotated one circle to ensure that the upper and lower end surfaces of the sampling ring 42 are flat; the upper end of the sampling seat tube 4 is threadedly connected to a cover 44, and a limit screw 45 is threadedly provided on the cover 44. The lower end of the limit screw 45 is rotatably connected to a limit plate 46, and the limit plate 46 is slidably placed in the sampling seat tube 4; the upper end of the limit screw 45 abuts against the connecting sleeve 54 through a second thrust bearing 47.

[0072] When implementing it, Figure 1As shown, the position of the sampling ring 42 in the sampling seat tube 4 is set according to the depth of sampling required. The position of the sampling ring 42 can be controlled by compensating tubes 43 of different lengths. The position of the deepest sampling ring 42 is controlled by setting a compensating tube 43 below the lowest sampling ring 42. The remaining sampling rings 42 are also controlled by the compensating tubes 43. The sampling ring 42 or the compensating tube 43 located at the top needs to abut against the limiting plate 46, thereby ensuring that the positions of all sampling rings 42 and the compensating tubes 43 in the sampling drill pipe 3 remain stationary. At the same time, the upper end of the limiting screw 45 on the sampling seat tube 4 abuts against the inner bottom of the connecting sleeve 54 through the second thrust bearing 47, thereby providing support for the sampling seat tube 4.

[0073] A soil sample collection method for grassland ecological restoration, using a soil sample collection device for grassland ecological restoration, comprises the following steps:

[0074] S1. Select multiple typical and representative sampling sites in the area to be ecologically restored, and select three small sample plots in the sampling site along the 0°, 120°, and 240° directions of the center of the circle. The three small sample plots are not less than 40 meters from the center of the circle. In specific implementation, in order to compare the changes before and after ecological restoration, it is necessary to select a reference ecosystem similar to the restoration area but not restored as the benchmark and control for ecological restoration. If the contract area cannot be found, it can also be used as a control before ecological restoration through quantitative remote sensing inversion (with reference to the remote sensing part below). Based on the natural geographical characteristics and ecological types of the Ruoergai alpine wetland grassland, this paper selects the same type of ecosystem that has not been restored, has a relatively complete structure, and has normal ecological functions as a reference ecosystem. These reference ecosystems have high similarity and comparability with the restoration area in terms of topography, landform, climate, hydrology, soil, vegetation, etc., which can reflect the effects and differences of ecological restoration.

[0075] In order to investigate and monitor the ecological restoration area and the reference ecosystem, it is necessary to set up a certain number and scale of sample plots and sample quadrats between the two to obtain data on various ecological indicators. According to the requirements of the "Technical Regulations for the Investigation and Monitoring of National Forests, Grasslands and Wetlands in 2022" (National Forestry and Grassland Administration, 2022), several sample plots were set up in the ecological restoration area and the reference ecosystem in accordance with the principles of representativeness, randomness, typicality and operability. The area of ​​each sample plot is determined according to different ecological types and terrain conditions. In each sample circle, three small sample plots along the center of the circle at 0°, 120°, and 240° are set according to a certain direction and distance to avoid human subjective selection error factors. At least three repeated experiments are collected for each ecological area type to avoid experimental accidental errors. The selection of sample circles should be able to reflect the average level of vegetation coverage and biomass in the overall restoration area, and the vegetation selection of sample circles should be typical and representative. The setting of sample plots and sample quadrats is intended to reflect the average level and range of variation of the ecological restoration area and the reference ecosystem, as well as the differences and characteristics of different ecological types and terrain conditions.

[0076] S2. Record the location, time, weather and other information of the sample plots and quadrat, as well as the sampling methods, tools and instrument parameters used; record the basic information of the small sample plot, such as slope, management method and soil type;

[0077] In order to obtain data on various ecological indicators of ecological restoration areas and reference ecosystems, field surveys and sampling are required in sample plots and quadrat. According to different ecological types and survey purposes, observation, measurement, counting, sampling and other methods were used to survey and sample hydrology, soil, vegetation, biomass and other indicators in sample plots and quadrat. During the survey and sampling process, attention was paid to the overall restoration status of the restoration area in the field survey. According to the growth of its grass (such as growth size, grass density and sparseness, etc.), a suitable range that can represent the regional effect of the restoration type as a whole was selected as the representative of the preparatory paving sample plot. A suitable sample circle center point was selected in it, and the surrounding observation was made to confirm whether the sample circle can roughly represent the effect of the entire restoration type. If it meets the restoration effect representative, grassland operations will be carried out. During the survey and sampling process, attention was also paid to recording the location, time, weather and other information of the sample plots and quadrat, as well as the parameters such as the methods, tools, and instruments used to ensure the accuracy and traceability of the data.

[0078] It should be noted that:

[0079] Sample plots were set up separately for grasslands in areas with different ecological restoration types;

[0080] Sample plots were set up for grasslands under different levels of desertification control and degraded grassland improvement measures;

[0081] The location of the sample plot is relatively fixed, and the clear mark of the field scope or the longitude and latitude coordinates of the center point are recorded (accurate to 8 decimal places);

[0082] The selected observation area should have good representativeness and consistency;

[0083] Sample plots were set up for grasslands of the same type with obvious differences in utilization patterns and utilization intensities;

[0084] In order to investigate and monitor the ecological restoration area, it is necessary to set up a certain number and scale of sample plots and quadrats in the restoration area to obtain data on various ecological indicators. According to the natural geographical characteristics and ecological types of the alpine wetland grassland, 50-120 highly representative 0.5-hectare circular sample plots were selected as the benchmark and control for ecological restoration. The radius of each sample plot is 40 meters, and a marker is set at the center of the sample plot for easy positioning and identification. In each sample plot, a 40-meter sample line is extended from the center of the sample plot in three directions of 0°, 120°, and 240° (to avoid subjective selection error factors) to facilitate distribution and sampling. At the end of each sample line, a small sample plot of 1 square meter is set for plant surveys and soil surveys. The setting of sample plots and quadrats is intended to reflect the average level and range of variation in the ecological restoration area, as well as the differences and characteristics of different ecological types and terrain conditions.

[0085] In order to obtain data on plant growth and biomass in ecological restoration areas, it is necessary to conduct plant surveys and sampling in sample plots and quadrat. Observation, measurement, counting, sampling and other methods were used to investigate and sample indicators such as plant species, quantity, height, coverage, and biomass in sample plots and quadrat. During the survey and sampling process, attention was paid to recording information such as the location, time, and weather of the sample plots and quadrat, as well as parameters such as the methods, tools, and instruments used to ensure the accuracy and traceability of the data. At the same time, attention was also paid to recording basic information in the quadrat, such as slope, management method, soil type, etc., in order to analyze the factors affecting plant growth. During the sampling process, the above-ground and underground parts of the plants were collected separately to facilitate the analysis of the above-ground and underground biomass and carbon storage of the plants.

[0086] S3. Use the harvesting method to obtain all plants and litter above the ground in the sample plot; in each 1 square meter grassland sample plot, collect the above-ground and underground biomass respectively. The above-ground part is collected by using scissors (or tools such as lawn mowers and sickles) to cut off all plant parts above the ground in the sample plot, and collect the litter in the sample plot without distinguishing plant species, put it in a plastic bag, and affix a label on the bag, indicating the sample plot number and sample plot number.

[0087] S4, setting the drill frame 1 in the sample plot, setting the sampling rings 42 in the sampling seat tube 4 at three depth levels of 0-20 cm, 20-40 cm, and 40-100 cm, and the distance between adjacent sampling rings 42 is achieved by setting compensation tubes 43 of different lengths;

[0088] The driving handle 51 is rotated forward, and the driving rod 53 is driven to rotate through the reducer 55. The driving rod 53 acts on the drill pipe 3 through the connecting sleeve 54. Under the downward pressure of the weight block 531 and the rotation of the drill pipe 3, the drill pipe 3 carries the sampling seat tube 4 and drills downward until the target depth is reached, so that all the sampling rings 42 inside are filled with target samples.

[0089] The positioning pin 12 is made to pass through the first pin hole 111 and the second pin hole 221 at the same time, and then the driving handle 51 is rotated in the opposite direction, so that the inner tube 31 and the outer tube 32 rotate relatively, and the planing claw 331 is slowly extended outwards as the drill pipe 3 rotates, so as to loosen the side wall of the soil where the drill pipe 3 is located, and at the same time, the cutting knife 36 is extended inwards, and the cutting knife 36 cuts the soil entering the sampling seat tube 4 and the original soil below as the drill pipe 3 rotates, so as to separate the two;

[0090] After the soil sidewall is loosened, the adjusting rod 25 is driven to rotate, so that the upper clamp ring 23 and the lower clamp ring 24 move toward each other, and the driving handle 51 is continuously rotated in the opposite direction, so that the drill pipe 3 drives the planing claw 331 to move up and down while rotating, so as to further loosen the soil, and then the positioning pin 12 is pulled out of the first pin hole 111 and the second pin hole 221, and the drill pipe 3 is pulled out to take out the samples in the multiple sampling rings 42;

[0091] The drilled hole at the sampling location was then backfilled;

[0092] S5. Take soil samples from each plot three times at each depth level, then mix the soil samples at the same level, rinse them with water, separate the plant roots, put them in plastic bags, and label the bags with the plot number, plot number and depth level.

[0093] In order to ensure the accuracy and comparability of biomass determination, this study followed the following principles and steps:

[0094] Representative sample plots were selected according to the grassland type, distribution and vegetation characteristics, and three replicates were set up in each plot to reduce errors and increase credibility.

[0095] According to the growing season of the herbaceous plants, the period of most vigorous plant growth was selected for harvesting to reflect the maximum biomass of the herbaceous plants.

[0096] When collecting aboveground biomass, plants within the plot were cut separately by species to facilitate subsequent species identification and biodiversity analysis.

[0097] When collecting the biomass of the underground part, soil samples were taken out separately according to the depth layers to facilitate the analysis of root distribution and biomass at different depths.

[0098] The collected plant samples and soil samples were placed in plastic bags respectively, and labels were affixed on the bags with information such as the plot number, quadrat number, species name or depth level, for the convenience of subsequent processing and analysis.

[0099] The collected plant samples and soil samples are transported to the laboratory for drying, weighing, screening, analysis and other operations to obtain the biomass data of each part.

[0100] S6. Repeat step S4, take out soil samples from each sample plot, that is, the soil in the sampling ring 42, take 3 samples at each depth level, and measure soil physical properties, such as soil moisture content, porosity and bulk density parameters; the sampling ring 42 here is similar to the ring knife in the ring knife method, and the measurement can be performed using the calculation method after sampling by the ring knife method.

[0101] S7. Collect 500-1000 g of loose soil for soil organic carbon content analysis and ultimately calculate the soil organic carbon reserve. The soil in the compensation tube 43 can be directly used.

[0102] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A soil sample collection device for grassland ecological restoration, characterized in that: The drill frame (1) comprises a drill stand (1), a straightening seat (2), a drill pipe (3), a sampling seat tube (4) and a driving member (5); the straightening seat (2) is arranged on the drill stand (1) in a vertically slidable manner; the straightening seat (2) is rotatably sleeved on the drill pipe (3); the driving member (5) is arranged on the drill stand (1) and is used to drive the drill pipe (3) to rotate; the sampling seat tube (4) is coaxially rotatably arranged inside the drill pipe (3); The drill pipe (3) comprises an inner pipe (31), an outer pipe (32), a soil-scraping piece (33) and a sampling drill bit (34); a plurality of soil-scraping pieces (33) are arranged around the drill pipe (3); the sampling drill bit (34) is arranged at the lower end of the drill pipe (3); and the outer pipe (32) is coaxially sleeved on the inner pipe (31); The soil-digging member (33) comprises a digging claw (331), a guide rod (332) and a sliding sleeve (333); the inner tube (31) is provided with an inner slot hole (311); the outer tube (32) is provided with an outer slot hole (321) corresponding to the inner slot hole (311); one end of the guide rod (332) is hinged to the inner slot hole (311); the other end of the guide rod (332) is connected to the digging claw (331); the sliding sleeve (333) is slidably sleeved on the guide rod (332); and the sliding sleeve (333) is hinged to the outer slot hole (321); A connecting head (334) is rotatably provided at one end of the guide rod (332) close to the inner slot hole (311), and the connecting head (334) is hingedly connected to the inner slot hole (311); A guide groove (3321) is obliquely provided on the guide rod (332), a guide sliding key (335) is provided on the sliding sleeve (333), and the lower end of the guide sliding key (335) is placed in the guide groove (3321).

2. A soil sample collection device for grassland ecological restoration according to claim 1, characterized in that: A plurality of through holes (35) are arranged in a circular array between the sampling drill bit (34) and the drill pipe (3), a cutting knife (36) is arranged in the through hole (35), a long slot hole (361) is opened on the cutting knife (36), one end of the cutting knife (36) is hinged to the lower end of the outer pipe (32), and a guide pin (362) is arranged at the lower end of the inner pipe (31), and the guide pin (362) is slidably placed in the long slot hole (361).

3. A soil sample collection device for grassland ecological restoration according to claim 2, characterized in that: A plurality of limiting slots (322) are arranged in an annular array on the outer tube (32), and a plurality of limiting rods (312) are arranged in an annular array on the outer wall of the inner tube (31), and the plurality of limiting rods (312) are slidably placed in the limiting slots (322).

4. A soil sample collection device for grassland ecological restoration according to claim 3, characterized in that: The straightening seat (2) comprises a straightening ring (21) and a sliding block (22), and a plurality of the sliding blocks (22) are arranged in a circular array on the outer wall of the straightening ring (21); a plurality of sliding grooves (11) are vertically arranged on the drilling frame (1), and the plurality of the sliding blocks (22) are respectively slidably placed in the plurality of the sliding grooves (11); An annular main guide rail (211) is arranged on the inner wall of the straightening ring (21), and a plurality of first rollers (323) are arranged in an annular array on the outer wall of the outer tube (32), and the plurality of first rollers (323) are rotatably placed on the main guide rail (211).

5. A soil sample collection device for grassland ecological restoration according to claim 4, characterized in that: The straightening seat (2) further comprises an upper clamping ring (23), a lower clamping ring (24) and a plurality of adjusting rods (25), wherein the upper clamping ring (23) and the lower clamping ring (24) are symmetrically arranged on the upper and lower sides of the straightening ring (21), and the plurality of adjusting rods (25) are arranged on the straightening ring (21) so as to be rotatable vertically, and the upper and lower ends of the adjusting rods (25) are respectively provided with a first thread (251) and a second thread (252), wherein the first thread (251) is threadedly connected to the upper clamping ring (23), and the second thread (252) is threadedly matched to the lower clamping ring (24), and the thread directions of the first thread (251) and the second thread (252) are opposite; A wavy upper guide rail (231) is disposed around the bottom of the upper clamping ring (23) on the side close to the outer tube (32), and a wavy lower guide rail (241) is disposed around the top of the lower clamping ring (24) on the side close to the outer tube (32), and an annular wavy guide groove (26) is formed between the upper guide rail (231) and the lower guide rail (241); A second roller (324) is coaxially arranged between the first roller (323) and the outer tube (32), and the second roller (324) is rotatably disposed in the wave guide groove (26).

6. A soil sample collection device for grassland ecological restoration according to claim 5, characterized in that: It also comprises a positioning pin (12), a plurality of first pin holes (111) are vertically spaced in the slide groove (11), and a second pin hole (221) is provided on the slide block (22); when the positioning pin (12) passes through the first pin hole (111) and the second pin hole (221) at the same time, the straightening seat (2) is fixed to the drilling frame (1).

7. A soil sample collection device for grassland ecological restoration according to claim 6, characterized in that: The driving member (5) comprises a driving handle (51), a shaft tube (52), a driving rod (53), a connecting sleeve (54) and a reducer (55); the shaft tube (52) is vertically arranged on the drilling frame (1); the shaft tube (52) is rotatably connected to the drilling frame (1); the driving handle (51) is sleeved on the shaft tube (52); the driving rod (53) is slidably inserted through the shaft tube (52); a driving sleeve (56) is sleeved on the driving rod (53); the driving sleeve (56) is connected to the driving rod (53) by a sliding key; the shaft tube (52) is transmission-connected to the driving sleeve (56) via the reducer (55); The lower end of the driving rod (53) is connected to the connecting sleeve (54), and the upper end of the inner tube (31) is placed in the connecting sleeve (54) and is spline-connected to the connecting sleeve (54); The reducer (55) comprises a sun gear (551), a planet carrier (552), a planet gear (553) and a ring gear (554); the sun gear (551) is sleeved on the lower end of the shaft tube (52); the planet carrier (552) is sleeved on the drive sleeve (56); a plurality of planet gears (553) are arranged in an annular array on the planet carrier (552); the ring gear (554) is arranged on the drilling frame (1); and the planet gear (553) is meshed with the ring gear (554) and the sun gear (551) at the same time; A limit seat (13) is also provided on the drilling frame (1), the limit seat (13) is sleeved on the driving sleeve (56), the driving sleeve (56) and the limit seat (13) are clearance-matched, and a first thrust bearing (555) is also sleeved on the driving sleeve (56), the upper and lower ends of the first thrust bearing (555) are respectively in contact with the planet carrier (552) and the limit seat (13); A weight block (531) is provided at the upper end of the driving rod (53).

8. A soil sample collection device for grassland ecological restoration according to claim 7, characterized in that: A limit ring (41) is provided at the lower end of the sampling seat tube (4), and the inner diameter of the limit ring (41) is smaller than the inner diameter of the sampling seat tube (4); The inner cavity of the sampling seat tube (4) is stacked with staggered sampling rings (42) and compensation tubes (43); the upper end of the sampling seat tube (4) is threadedly connected to a sealing cover (44); a limiting screw (45) is provided on the sealing cover (44) in a threaded manner; the lower end of the limiting screw (45) is rotatably connected to a limiting plate (46); and the limiting plate (46) is slidably placed in the sampling seat tube (4); The upper end of the limiting screw (45) abuts against the connecting sleeve (54) via a second thrust bearing (47).

9. A soil sample collection method for grassland ecological restoration, using a soil sample collection device for grassland ecological restoration as claimed in claim 8, characterized in that: The following steps are involved: S1. Select several typical and representative sampling sites in the area to be restored, and select three small sample plots along the 0°, 120°, and 240° directions of the center of the circle within the sampling site. The three small sample plots should be no less than 40 meters away from the center of the circle; S2. Record the location, time, weather and other information of the sample plots and quadrat, as well as the sampling methods, tools and instrument parameters used; record the slope, management method and soil type within the small sample plot; S3, using the harvesting method to obtain all plants and litter above the ground in the sample plot; S4, setting the drilling frame (1) in the sample plot, setting the sampling rings (42) in the sampling seat tube (4) at three depth levels of 0-20 cm, 20-40 cm, and 40-100 cm, and the distance between adjacent sampling rings (42) is achieved by setting compensation tubes (43) of different lengths; The driving handle (51) is rotated forwardly, and the driving rod (53) is driven to rotate through the reducer (55), and the driving rod (53) acts on the drill pipe (3) through the connecting sleeve (54). Under the downward pressure of the weight block (531) and the self-rotation of the drill pipe (3), the drill pipe (3) carries the sampling seat tube (4) and drills downward until the target depth is reached; The positioning pin (12) is simultaneously passed through the first pin hole (111) and the second pin hole (221), and then the driving handle (51) is rotated in the opposite direction, so that the inner tube (31) and the outer tube (32) rotate relative to each other, and the planing claw (331) is slowly extended outwardly as the drill pipe (3) rotates, so as to loosen the side wall of the soil where the drill pipe (3) is located, and at the same time, the cutting knife (36) is extended inwardly, and the cutting knife (36) cuts the soil entering the sampling seat tube (4) and the original soil below as the drill pipe (3) rotates, so as to separate the two; After the side wall of the soil is loosened, the adjusting rod (25) is driven to rotate, thereby causing the upper clamping ring (23) and the lower clamping ring (24) to move toward each other, and the driving handle (51) is continuously rotated in the opposite direction, so that the drill pipe (3) drives the planing claw (331) to move up and down while rotating, thereby further loosening the soil, and then the positioning pin (12) is pulled out of the first pin hole (111) and the second pin hole (221), the drill pipe (3) is pulled out, and the samples in the plurality of sampling rings (42) are taken out; The drilled hole at the sampling location was then backfilled; S5. Take soil samples from each sample plot three times at each depth level, then mix the soil samples at the same level, rinse with water, and separate the plant roots; S6. Repeat step S4, taking soil samples from each sample plot three times at each depth level, and measuring soil physical properties, such as soil moisture content, porosity and bulk density parameters; S7. Collect loose soil and calculate soil organic carbon storage.

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