CN104770257A - Method for recovering vegetation through micropore thin films - Google Patents
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- CN104770257A CN104770257A CN201510228659.7A CN201510228659A CN104770257A CN 104770257 A CN104770257 A CN 104770257A CN 201510228659 A CN201510228659 A CN 201510228659A CN 104770257 A CN104770257 A CN 104770257A
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Abstract
The invention provides a method for recovering vegetation through micropore thin films. The method comprises the operation steps that (1) a field is cleaned; (2) the corresponding micropore thin film is laid; (3) earthwork standard rooms are laid and fixed; (4) a nutrition matrix is poured; (5) plant seeds are sowed; (6) the corresponding micropore thin film is laid; (7) fixation is carried out; (8) watering, management and maintenance are carried out. The construction technology is simple, the later stage management and maintenance are convenient, continuous and effective nutrients can be provided for the growth of plants, soil moisture evaporation can be effectively restrained, the soil air permeability can be improved, the germination rate of the plant seeds can be increased, and finally the purposes of effective greening, soil improving and ecological environment improving are achieved. The method can be widely applied to recovery of vegetation of barren mountains, engineering abandon places, cities and the like.
Description
Technical field
The present invention relates to a kind of method for recovering vegetation, particularly a kind of method utilizing microporous membrane to carry out revegetation.
Background technology
Along with the quickening of industrial development and process of modernization, local economy achieves encouraging success, also brings some ecological environment problems simultaneously.City constantly to surrounding area expansion, is cut the earth, is opened a way, gets stone etc. and causes a large amount of exposed hill, and China has and there is a large amount of bare slope more than the mountain region of 50% area, hills, loess plateau, corrodes quite serious.These exposed hill due to land occupation condition severe, revegetation difficulty is very large, survival rate, storage rate are not high, and vegetation growth is slow, poor stability, quality is low, cause that vegetation landscape is destroyed, ecosystem degradation and deterioration, geological disaster hidden danger increases the weight of, had a strong impact on the productive life of exposed hill and nearby residents, constrained Regional Economic Sustainable Development, therefore, the revegetation of exposed hill seems very urgent.At present, traditional recovering method mainly contains linked network, sow grass seeds by duster and framework protection etc., but all there are some defects in these technology: net hanging method is by force technical, comprise civil engineering, sowing engineering, maintenance project three technical systems, operational procedure is loaded down with trivial details and requirement is strict, and recovery effects is often because construction reason is had a greatly reduced quality; Spray seeding technique cost is high, and barrier propterty is unstable, and landscape effect is poor, and preserve moisture and fertility performance is poor, not drought-enduring, and easy-weathering be full of cracks, late maintaining workload is large costly; Framework protection adopts concrete, stone masonry etc. to make skeleton sash, needs the building stones of at substantial, is unfavorable for slope drainage, easily produce freeze thawing, frost heaving failure, and from great, increase domatic load, cause structural instability.
Summary of the invention
The object of the invention is to overcome above-mentioned shortcoming, provide one to utilize microporous membrane to realize temperature control water conservation, promote seed germination, improve the effects such as view sight, and the method for recovering vegetation that construction cost is lower, late maintaining operation is easy.
Method for recovering vegetation of the present invention, its operating procedure comprises:
1) carry out site clearing, cleaning content comprises earth's surface rubbish incidental, bulk gravel, and carries out suitable smooth process;
2) microporous membrane 1(1 is laid in step 1 surface), described microporous membrane 1 thickness is 0.10 ~ 0.15mm, and infiltration speed is at more than 1mm/min;
3) in step 2) Surface pavement geotechnical grid (2), described geotechnical grid is that HDPE sheet material is welded, weld spacing from 200 ~ 240mm, the high 30 ~ 60mm in lattice room, single hole lattice room area 0.05m
2; Fully open lattice chamber component, fix at node location holdfast (3), holdfast length is 40cm; The U-shaped holdfast of surrounding is fixed by spacing 70cm, and centre F type holdfast is triangular in shape fixing by spacing 1.2m;
4) at step 3) surface uniform spreading nutrient matrix (4), space, spacer-frame room, filling thickness 6 ~ 8cm; Described nutrient matrix formula is: the peat composed of rotten mosses: 800 ~ 1100 parts, vermiculite: 800 ~ 1100 parts, purple mud rock: 300 ~ 600 parts, wheat bran: 20 ~ 30 parts, water-loss reducer: 80 ~ 110 parts, disinfectant: 0.5 ~ 0.8 part, composite fertilizer: 13 ~ 16 parts, root-inducing powder: 1 ~ 3 part;
5) sow by landscape need on step 4) surface, broadcast sowing similar and different plant seed at not apposition chamber region, each lattice room seeding quantity is 3 ~ 8 seeds, plant seed comprise one in arbor, shrub, herbaceous plant or any two, three kind;
6) microporous membrane 2(5 is laid on step 5) surface), described microporous membrane 2 thickness is 0.08 ~ 0.10mm, and infiltration more than speed 1.2mm/min, it is uniformly distributed perforate, percent opening 30% ~ 40%, pore size 5 ~ 7 μm; In the position that dative room is corresponding, film is distributed with seed germination hole, germinal aperature is cross otch in length and breadth, distributes along the diagonal square crossing of lattice room;
7) be fixed in film surrounding and centre by spacing 1m at step 6) surface bamboo nail or wooden peg (6);
8) water seasoning: adopt high-pressure atomization mode to water to step 7) surface, waters a small amount of repeatedly until saturated first; Moisturizing is carried out when Their Seed Germinating Period and vegetative period.
The present invention's microporous membrane used is compared with traditional films, and it is advantageous that can the opening and closing of Intelligent adjustment micropore, is inlaid with hydroscopic high-molecular resin micropore switch in micropore canals, micropore switch imbibition when meeting water, and micropore is opened, and moisture infiltrates; Under arid situation, micropore switch dehydration shrinkage, micropore is closure state, reduces soil water evaporation.
The method that the present invention utilizes microporous membrane to carry out revegetation has following beneficial effect: one is step 2) described Perforated plastic film 1 can be used as moisture buffering ensure, film is as aquifer, at rainwater or under irrigating sufficient condition, film retaining reach saturated after, unnecessary moisture by micropore permeation on film to soil horizon; In prolonged drought insufficient water situation, film retaining can be hypothallus and provides moisture; Two is geotechnical grid described in step 3) can play side direction geo-grid reinforcement on the one hand effects to nutrient matrix, strengthen matrix bearing capacity, prevent matrix and plant seed to run off with precipitation, the effect of fixing root system of plant can be played on the other hand, realize plant stability planting; Three is that nutrient matrix layer described in step 4) contains abundant nutriment and active material, and aspect is loosened, and is beneficial to seed quick-speed germination and takes root; Four is sow by step 5) mode, can ensure plant build up after rational density, avoid nutrient supply not enough, plant seed consumption can be reduced simultaneously, cost-saving, also can improve and use ground view sight, meet Plant Diversity requirement; Five is that microporous membrane 2 described in step 6) can not only stop rainwater washing away and sputter matrix, reduces stromal surface runoff and erosion, strengthen the stability of matrix, and film effectively can suppress soil evaporation, reduces water management program, can play water saving effect; On film, perforate increases the gas permeability of soil, emerges smoothly when the design in seed germination hole ensures seed germination, improves seed germination rate; Colorful film can strengthen sight, avoids Their Seed Germinating Period dull coloring.
Preferably, step 2) in, described geotechnical grid is that HDPE sheet material is welded, weld spacing from 230mm, lattice room height 50mm, single hole lattice room area 0.05m
2.
When geotechnical grid is above-mentioned specification, good revegetation effect can be obtained.
Preferably, the formula of nutrient matrix described in step 4) is: the peat composed of rotten mosses: 1000 parts, vermiculite: 1000 parts, purple mud rock: 500 parts, wheat bran: 25 parts, water-loss reducer: 100 parts, disinfectant: 0.7 part, composite fertilizer: 15 parts, root-inducing powder 2 parts.
When nutrient matrix formula is above-mentioned formula, good revegetation effect can be obtained.
Described water-loss reducer is hydroscopic high-molecular resin, and described disinfectant is spectrum soil fungicides, described composite fertilizer total nutrient (N+P
2o
5+ K
2o) content is not less than 30%, and described root-inducing powder is water-soluble broad-spectrum plant growth regulator.
As shown in the embodiment of the invention, compared with conventional method for recovering vegetation, the present invention can significantly improve the germination rate of vegetation, survival rate and vegetation cover degree.
It is worthy of note, why the present invention can realize outstanding technique effect, and what reason was the invention is provided with method step, carries out conventional treatment, all belong to protection scope of the present invention to wherein certain step.As for some composition in nutrient matrix, utilizing the composition with said function to substitute, is do not deviate from spirit of the present invention, still belongs to scope.
Adopt the inventive method to carry out revegetation, working procedure is simple, and later stage pipe is supported easy, and seed germination rate is high, and vegetation is soon shaping, and cover degree is high, and cost is reasonable simultaneously, is adapted at the ground such as exposed hill, engineering slope and uses.
Accompanying drawing explanation
Fig. 1 the inventive method has been constructed rear schematic cross-section; Wherein, 1-microporous membrane 1,2-geotechnical grid, 3-holdfast, 4-nutrient matrix, 5-microporous membrane 2,6-bamboo nail or wooden peg.
Fig. 2 the inventive method seed germination hole perforate mode.
Embodiment
Embodiment 1:
Operating procedure is as follows:
1) carry out site clearing, cleaning content comprises earth's surface rubbish incidental, bulk gravel etc., and carries out suitably smooth;
2) microporous membrane 1 is laid in step 1 surface;
3) in step 2) Surface pavement geotechnical grid, described geotechnical grid is that HDPE sheet material is welded, weld spacing from 210mm, lattice room height 50mm, single hole lattice room area 0.05m
2; Fully open lattice chamber component, fix at node location holdfast, holdfast length is 40cm; The U-shaped holdfast of surrounding is fixed by spacing 70cm, and centre F type holdfast is triangular in shape fixing by spacing 1.2m;
4) at step 3) surface uniform spreading nutrient matrix, space, spacer-frame room, filling thickness 6 ~ 8cm.Described nutrient matrix formula is: the peat composed of rotten mosses: 1000 parts, vermiculite: 800 parts, purple mud rock: 500 parts, wheat bran: 25 parts, water-loss reducer: 80 parts, disinfectant: 0.7 part, composite fertilizer: 15 parts, root-inducing powder: 2 parts; Wherein, the peat composed of rotten mosses, vermiculite, purple mud rock, wheat bran are common used material, and water-loss reducer is conventional hydroscopic high-molecular resin, and disinfectant is spectrum soil fungicides, composite fertilizer's total nutrient (N+P
2o
5+ K
2o) content 40%, root-inducing powder is water-soluble broad-spectrum plant growth regulator;
5) sow by the general layout of three row draft, a line shrub on step 4) surface, herbaceous plant seeds selects alfalfa, Festuca Arundinacea, Trifolium repense, seeding quantity is 5 ~ 8, each lattice room seed, and shrub plant is Sophora viciifolia, caragana microphylla, and seeding quantity is 3 ~ 4, each lattice room seed;
6) lay microporous membrane 2 on step 5) surface, described microporous membrane 2 is uniformly distributed perforate, percent opening 30% ~ 40%, pore size 5 ~ 7 μm; In the position that dative room is corresponding, film is distributed with seed germination hole, germinal aperature is cross otch in length and breadth, distributes along the diagonal square crossing of lattice room.For strengthening Their Seed Germinating Period place appreciative value and environment compatibility, microporous membrane 2 color is chosen to be green;
7) be fixed in film surrounding and centre by spacing 1m at step 6) surface bamboo nail;
8) water seasoning: adopt high-pressure atomization mode to water to step 7) surface, waters a small amount of repeatedly until saturated first; Suitable moisturizing is carried out as the case may be at Their Seed Germinating Period and vegetative period.
Implementation result:
The present invention is applied to the revegetation along the line of Dujiang weir, Sichuan high speed, engineering time is in June, 2013, to adopt traditional films, directly carry out site clearing, lay condition of equivalent thickness nutrient matrix, broadcast sowing plant seed for contrast: 1) in construction after 20 days, statistics germination rate display: vegetation seed germination rate of the present invention reaches more than 90%, contrast vegetation seed germination rate is 75%; In April, 2014, plant through surviving the winter, more after summer checking, statistics plant survival rate, vegetation cover degree and landscape quality display: vegetation survival rate of the present invention is 85%, and vegetation cover degree is 93%, and Distribution of plant community ratio is suitable for, and spatial level is clearly demarcated, and sight is strong; Contrast vegetation survival rate is for being only 65%, and vegetation cover degree is 58%, and Distribution of plant community is uneven, and spatial level is mixed and disorderly, and landscape effect is general; 2) in June, 2014, get nutrient matrix of the present invention respectively and contrast nutrient matrix and carry out water content detection, result shows: matrix average moisture content of the present invention is 38.6%, and contrast water content is then 23.2%, illustrate that the inventive method can effectively suppress moisture to evaporate, meet plant growth water demand.
Embodiment 2:
Operating procedure is as follows:
1) carry out site clearing, cleaning content comprises earth's surface rubbish incidental, bulk gravel etc., and carries out suitably smooth;
2) microporous membrane 1 is laid in step 1 surface;
3) in step 2) Surface pavement geotechnical grid, described geotechnical grid is that HDPE sheet material is welded, weld spacing from 230mm, lattice room height 60mm, single hole lattice room area 0.05m
2; Fully open lattice chamber component, fix at node location holdfast, holdfast length is 40cm; The U-shaped holdfast of surrounding is fixed by spacing 70cm, and centre F type holdfast is triangular in shape fixing by spacing 1.2m;
4) at step 3) surface uniform spreading nutrient matrix, space, spacer-frame room, filling thickness 6 ~ 8cm.Described nutrient matrix formula is: the peat composed of rotten mosses: 1100 parts, vermiculite: 1100 parts, purple mud rock: 600 parts, wheat bran: 25 parts, water-loss reducer: 110 parts, disinfectant: 0.8 part, composite fertilizer: 16 parts, root-inducing powder: 3 parts.Wherein, the peat composed of rotten mosses, vermiculite, purple mud rock, wheat bran are common used material, and water-loss reducer is conventional hydroscopic high-molecular resin, and disinfectant is spectrum soil fungicides, composite fertilizer's total nutrient (N+P
2o
5+ K
2o) content 35%, root-inducing powder is water-soluble broad-spectrum plant growth regulator;
5) sow by the layout of outside draft, middle shrub on step 4) surface, herbaceous plant selects paspalum notatum, Chinese violet, and seeding quantity is 5 ~ 8, each lattice room seed; Shrub plant selects Rhododendron sutchuenense, and seeding quantity is 3 ~ 4, each lattice room seed;
6) lay microporous membrane 2 on step 5) surface, described microporous membrane 2 is uniformly distributed perforate, percent opening 30% ~ 40%, pore size 5 ~ 7 μm; In the position that dative room is corresponding, film is distributed with seed germination hole, germinal aperature is cross otch in length and breadth, distributes along the diagonal square crossing of lattice room.For strengthening Their Seed Germinating Period place appreciative value and environment compatibility, microporous membrane 2 color is chosen to be green;
7) be fixed in film surrounding and centre by spacing 1m at step 6) surface bamboo nail;
8) water seasoning: adopt high-pressure atomization mode to water to step 7) surface, waters a small amount of repeatedly until saturated first; Moisturizing is carried out at Their Seed Germinating Period and vegetative period.
Implementation result:
The present invention is applied to certain street planting band revegetation, engineering time is in March, 2013, to adopt traditional films, directly carry out site clearing, lay condition of equivalent thickness nutrient matrix, broadcast sowing plant seed for contrast: 1) in construction after 15 days, statistics germination rate display: vegetation seed germination rate of the present invention is 89%, contrast vegetation seed germination rate is 73%; Construct after 1 year, plant through surviving the winter, more after summer checking, statistics plant survival rate, vegetation cover degree display: vegetation survival rate of the present invention is 84%, and vegetation cover degree is 92%; Contrast vegetation survival rate is 76%, and vegetation cover degree is 84%.2) after constructing 1 year, get nutrient matrix of the present invention respectively and contrast nutrient matrix and carry out water content detection, result shows: matrix average moisture content of the present invention is 34.7%, and contrast water content is then 18.6%, illustrate that the inventive method can effectively suppress moisture to evaporate, meet plant growth water demand.
Embodiment 3:
Operating procedure is as follows:
1) carry out site clearing, cleaning content comprises earth's surface rubbish incidental, bulk gravel etc., and carries out suitably smooth;
2) microporous membrane 1 is laid in step 1 surface.
3) in step 2) Surface pavement geotechnical grid, described geotechnical grid is that HDPE sheet material is welded, weld spacing from 200mm, lattice room height 30mm, single hole lattice room area 0.05m
2; Fully open lattice chamber component, fix at node location holdfast, holdfast length is 40cm; The U-shaped holdfast of surrounding is fixed by spacing 70cm, and centre F type holdfast is triangular in shape fixing by spacing 1.2m;
4) at step 3) surface uniform spreading nutrient matrix, space, spacer-frame room, filling thickness 6 ~ 8cm.Described nutrient matrix formula is: the peat composed of rotten mosses: 800 parts, vermiculite: 800 parts, purple mud rock: 300 parts, wheat bran: 20 parts, water-loss reducer: 100 parts, disinfectant: 0.5 part, composite fertilizer: 13 parts, root-inducing powder: 1 part.Wherein, the peat composed of rotten mosses, vermiculite, purple mud rock, wheat bran are common used material, and water-loss reducer is conventional hydroscopic high-molecular resin, and disinfectant is spectrum soil fungicides, composite fertilizer's total nutrient (N+P
2o
5+ K
2o) content 40%, root-inducing powder is water-soluble broad-spectrum plant growth regulator;
5) sow by the layout of outside draft, middle shrub on step 4) surface, herbaceous plant selects paspalum notatum, Chinese violet, and seeding quantity is 5 ~ 8, each lattice room seed; Shrub plant selects Rhododendron sutchuenense, and seeding quantity is 3 ~ 4, each lattice room seed;
6) lay microporous membrane 2 on step 5) surface, described microporous membrane 2 is uniformly distributed perforate, percent opening 30% ~ 40%, pore size 5 ~ 7 μm; In the position that dative room is corresponding, film is distributed with seed germination hole, germinal aperature is cross otch in length and breadth, distributes along the diagonal square crossing of lattice room.For strengthening Their Seed Germinating Period place appreciative value and environment compatibility, microporous membrane 2 color is chosen to be green;
7) be fixed in film surrounding and centre by spacing 1m at step 6) surface bamboo nail;
8) water seasoning: adopt high-pressure atomization mode to water to step 7) surface, waters a small amount of repeatedly until saturated first; Moisturizing is carried out at Their Seed Germinating Period and vegetative period.
Claims (4)
1. utilize microporous membrane to carry out a method for revegetation, it is characterized in that, comprise the following steps:
1) carry out site clearing, cleaning content comprises earth's surface rubbish incidental, bulk gravel, and carries out suitable smooth process;
2) microporous membrane 1(1 is laid in step 1 surface), described microporous membrane 1 thickness is 0.10 ~ 0.15mm, and infiltration speed is at more than 1mm/min;
In step 2) Surface pavement geotechnical grid (2), described geotechnical grid is that HDPE sheet material is welded, weld spacing from 200 ~ 240mm, the high 30 ~ 60mm in lattice room, single hole lattice room area 0.05m
2; Fully open lattice chamber component, fix at node location holdfast (3), holdfast length is 40cm; The U-shaped holdfast of surrounding is fixed by spacing 70cm, and centre F type holdfast is triangular in shape fixing by spacing 1.2m;
4) at step 3) surface uniform spreading nutrient matrix (4), space, spacer-frame room, filling thickness 6 ~ 8cm; Described nutrient matrix formula is: the peat composed of rotten mosses: 800 ~ 1100 parts, vermiculite: 800 ~ 1100 parts, purple mud rock: 300 ~ 600 parts, wheat bran: 20 ~ 30 parts, water-loss reducer: 80 ~ 110 parts, disinfectant: 0.5 ~ 0.8 part, composite fertilizer: 13 ~ 16 parts, root-inducing powder: 1 ~ 3 part;
5) sow by landscape need on step 4) surface, broadcast sowing similar and different plant seed at not apposition chamber region, each lattice room seeding quantity is 3 ~ 8 seeds, plant seed comprise one in arbor, shrub, herbaceous plant or any two, three kind;
6) microporous membrane 2(5 is laid on step 5) surface), described microporous membrane 2 thickness is 0.08 ~ 0.10mm, and infiltration more than speed 1.2mm/min, it is uniformly distributed perforate, percent opening 30% ~ 40%, pore size 5 ~ 7 μm; In the position that dative room is corresponding, film is distributed with seed germination hole, germinal aperature is cross otch in length and breadth, distributes along the diagonal square crossing of lattice room;
7) be fixed in film surrounding and centre by spacing 1m at step 6) surface bamboo nail or wooden peg (6);
8) water seasoning: adopt high-pressure atomization mode to water to step 7) surface, waters a small amount of repeatedly until saturated first; Moisturizing is carried out when Their Seed Germinating Period and vegetative period.
2. method according to claim 1, is characterized in that, step 2) in, described geotechnical grid is that HDPE sheet material is welded, weld spacing from 230mm, lattice room height 50mm, single hole lattice room area 0.05m
2.
3. method according to claim 1, is characterized in that, the formula of nutrient matrix described in step 4) is: the peat composed of rotten mosses: 1000 parts, vermiculite: 1000 parts, purple mud rock: 500 parts, wheat bran: 25 parts, water-loss reducer: 100 parts, disinfectant: 0.7 part, composite fertilizer: 15 parts, root-inducing powder 2 parts.
4. method according to claim 3, is characterized in that, described water-loss reducer is hydroscopic high-molecular resin, and described disinfectant is spectrum soil fungicides, described composite fertilizer total nutrient (N+P
2o
5+ K
2o) content is not less than 30%, and described root-inducing powder is water-soluble broad-spectrum plant growth regulator.
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| CN107197666A (en) * | 2017-05-25 | 2017-09-26 | 济南大学 | A kind of long-acting multiple method for green of exposed hill of quarrying |
| CN107691027A (en) * | 2017-09-12 | 2018-02-16 | 四川沃尔宜环保科技有限公司 | Defend and control sand water saving temperature control method |
| CN107761696A (en) * | 2017-09-12 | 2018-03-06 | 四川沃尔宜环保科技有限公司 | Stockyard airborne dust ecology covering volume application process |
| CN109371986A (en) * | 2018-10-16 | 2019-02-22 | 北京星河园林景观工程有限公司 | A kind of ecological bank protecting method conducive to slope plant growth |
| CN110012813A (en) * | 2019-04-03 | 2019-07-16 | 四川大学 | A kind of matrix granule and preparation method thereof for vegetation repair |
| CN110012812A (en) * | 2019-04-03 | 2019-07-16 | 四川大学 | It is a kind of for carrying out the construction of slope vegetation restoration |
| CN110012814A (en) * | 2019-04-03 | 2019-07-16 | 四川大学 | A kind of construction carrying out slope vegetation restoration for high altitude localities |
| CN112292956A (en) * | 2020-10-29 | 2021-02-02 | 大竹县万康生态农业有限公司 | Soil improvement method |
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| CN106106110A (en) * | 2016-06-27 | 2016-11-16 | 湖南文理学院 | A kind of revegetation construction device in ecological security assessment pattern |
| CN106106110B (en) * | 2016-06-27 | 2019-02-15 | 湖南文理学院 | One kind is for revegetation construction device in ecological security assessment mode |
| CN107197666A (en) * | 2017-05-25 | 2017-09-26 | 济南大学 | A kind of long-acting multiple method for green of exposed hill of quarrying |
| CN107691027A (en) * | 2017-09-12 | 2018-02-16 | 四川沃尔宜环保科技有限公司 | Defend and control sand water saving temperature control method |
| CN107761696A (en) * | 2017-09-12 | 2018-03-06 | 四川沃尔宜环保科技有限公司 | Stockyard airborne dust ecology covering volume application process |
| CN109371986A (en) * | 2018-10-16 | 2019-02-22 | 北京星河园林景观工程有限公司 | A kind of ecological bank protecting method conducive to slope plant growth |
| CN110012813A (en) * | 2019-04-03 | 2019-07-16 | 四川大学 | A kind of matrix granule and preparation method thereof for vegetation repair |
| CN110012812A (en) * | 2019-04-03 | 2019-07-16 | 四川大学 | It is a kind of for carrying out the construction of slope vegetation restoration |
| CN110012814A (en) * | 2019-04-03 | 2019-07-16 | 四川大学 | A kind of construction carrying out slope vegetation restoration for high altitude localities |
| CN112292956A (en) * | 2020-10-29 | 2021-02-02 | 大竹县万康生态农业有限公司 | Soil improvement method |
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| CN104770257B (en) | 2017-04-26 |
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