CN106171616A - A kind of draining kind plant hole structure of cleansing and recycling - Google Patents
A kind of draining kind plant hole structure of cleansing and recycling Download PDFInfo
- Publication number
- CN106171616A CN106171616A CN201610773479.1A CN201610773479A CN106171616A CN 106171616 A CN106171616 A CN 106171616A CN 201610773479 A CN201610773479 A CN 201610773479A CN 106171616 A CN106171616 A CN 106171616A
- Authority
- CN
- China
- Prior art keywords
- plant hole
- layer
- hole structure
- draining
- recycling
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G9/00—Cultivation in receptacles, forcing-frames or greenhouses; Edging for beds, lawn or the like
- A01G9/02—Receptacles, e.g. flower-pots or boxes; Glasses for cultivating flowers
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B3/00—Methods or installations for obtaining or collecting drinking water or tap water
- E03B3/02—Methods or installations for obtaining or collecting drinking water or tap water from rain-water
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/108—Rainwater harvesting
Abstract
The present invention relates to the draining kind plant hole structure of a kind of cleansing and recycling, it is made up of growing body, deflector, collection and purification mechanism three part, the unnecessary water body in cohesive soil kind plant hole can be discharged in time, avoid transplanting soil ball to be soaked, reduce plant percent, and water body unnecessary in plant pit is carried out cleansing and recycling.Wherein, feature permeable for cohesive soil, that breathability is poor, use the kind plant hole structure of arc boss, and inside clarifier-tank, set gradually cobblestone layer, metalling, zeolite layer, Flyash Layer from bottom to top, hydraulic pressure effect is utilized by ecological filtering layer, water body to be carried out preliminary purification from bottom to top, within in time getting rid of kind of plant hole and around on the basis of hydrops, unnecessary water body is carried out cleansing and recycling, farthest improve the recycling of plant percent and water resource, it is adaptable to the transplanting of the big scale of construction nursery stock such as cohesive soil Regional City shade tree.
Description
Technical field
The present invention relates to a kind of ecological environment field, particularly relate to the draining kind plant hole structure of a kind of cleansing and recycling, especially
It is suitably applied the sidewalk planting in the cohesive soil that drainage is poor.
Background technology
In urban landscaping, arbor presents its unique charm, and it is not only the basic bone of urban landscaping
Frame, plays its landscape effect within the shortest time, and most important in improving urban ecological environment, has certain life
State benefit and social benefit.But while afforestation carries out arbor transplanting, also expose, shifting high to implantation technique requirement
Plant cost height, survival rate is on the low side, easily cause some problems such as the wasting of resources.Due to plant percent and nursery stock soil ball surrounding whether
Permeable, ventilative closely related, the especially water-permeable and air permeable of cohesive soil is poor, and at plum rain season, plant pit hydrops causes and survives
Rate is on the low side is also more stubborn problem.Unnecessary rainwater not only makes seedling root be soaked, and also can cause the wave of water resource
Take.
Summary of the invention
It is an object of the invention to, poor air permeability permeable for clayed soil, arbor easily causes plant pit hydrops, nursery stock after transplanting
Root system is soaked, and reduces plant percent and the problem causing water resource waste, it is proposed that the draining plantation of a kind of cleansing and recycling
Cave structure, within time getting rid of kind of plant hole and around on the basis of hydrops, unnecessary water body is carried out cleansing and recycling, thus avoids
Tree root is immersed in water, the growth of the newest root, improves the survival rate that arbor is transplanted.
For achieving the above object, the invention provides the draining kind plant hole structure of a kind of cleansing and recycling, described draining is planted
Cave structure include planting transplanting growing body, at least one be arranged on the other collection and purification mechanism of described growing body,
Connecting the deflector of described growing body bottom and collection and purification mechanism bottom respectively, described growing body includes and transplants tree
What wood soil ball specification matched plants plant hole and is arranged on the arc boss bottom described kind of plant hole, described collection and purification machine
Structure is the clarifier-tank that top is provided with outlet, includes cobblestone layer, the rubble set gradually from bottom to top inside described clarifier-tank
Layer, zeolite layer, Flyash Layer, described deflector includes being arranged on the vertical pod apertures at described arc boss edge, two ends are divided
Do not connect the curb of described vertical pod apertures and cobblestone layer.
Preferably, a diameter of the 5～8cm of described vertical pod apertures, the degree of depth is 30～50cm；Described curb a length of
20～30cm.
Preferably, being at least partly filled with particle diameter in described vertical pod apertures and described curb is 0.2～0.35cm
Thick medium sand.
Preferably, anti-backflow switch it is provided with in described curb.
Preferably, described clarifier-tank is formed by ventilation anti-seepage sand is prefabricated, and top arranges hole.
Preferably, described cobblestone layer, metalling, zeolite layer are formed by mesh grid cladding laying, described Flyash Layer
Formed by non-woven fabrics cladding laying.
Preferably, described cobblestone layer, metalling, zeolite layer, the thickness of Flyash Layer are 15～20cm, and described
Cobblestone layer, metalling, zeolite layer cobble, rubble, the particle diameter of zeolite are 3～6cm.
Preferably, the top of described arc boss is ellipse hemisphere, the equatorial radius of described ellipse hemisphere and described kind of plant hole
The length of side is identical, and the ratio of the equatorial radius of described ellipse hemisphere and polar radius is (1.5～3): 1.
Based on technique scheme, the invention have the advantage that
The draining kind plant hole structure of the cleansing and recycling of the present invention is by growing body, deflector, three, collection and purification mechanism
It is grouped into, the unnecessary water body in cohesive soil kind plant hole can be discharged in time, it is to avoid transplant soil ball and soaked, reduce Survival rate of nursery stock
Rate, and water body unnecessary in plant pit is carried out cleansing and recycling.Wherein, the feature that, breathability permeable for cohesive soil is poor, use
Plant hole is planted in similar " the bottom of a pan " of arc boss, and utilizes hydraulic pressure effect to be carried out water body tentatively by ecological filtering layer from bottom to top
Purify, within time getting rid of kind of plant hole and around on the basis of hydrops, unnecessary water body is carried out cleansing and recycling, there is structure simple
List, effect are obvious, promote easy feature.
The present invention incorporates rainwater purification reuse theory, forms the kind plant hole draining being suitable for cohesive soil transplanting nursery stock
And the structure of cleansing and recycling.And from water body collection device front end, incorporate physical chemistry bioprocess, formed at the beginning of water body
Step purifies, and devises a kind of unnecessary water body utilizing kind of plant hole to discharge and carries out purifying and reuse, farthest improves nursery stock
Survival rate and the recycling of water resource, it is adaptable to the transplanting of the big scale of construction nursery stock such as cohesive soil Regional City shade tree.
Accompanying drawing explanation
Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the application, this
Bright schematic description and description is used for explaining the present invention, is not intended that inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the draining kind plant hole structural representation of cleansing and recycling.
Detailed description of the invention
Below by drawings and Examples, technical scheme is described in further detail.
The invention provides the draining kind plant hole structure of a kind of cleansing and recycling, it is mainly by growing body, deflector, receipts
Collection purification mechanism three part composition.As it is shown in figure 1, wherein indicated a kind of preferred implementation of the present invention.Specifically, institute
State draining kind plant hole structure include planting transplanting 1 growing body, at least one be arranged on the receipts that described growing body is other
Collection purification mechanism, connect the deflector of described growing body bottom and collection and purification mechanism bottom respectively.
Wherein, described growing body includes the kind plant hole 2 matched with transplanting soil ball 3 specification and is arranged on
Arc boss 4 bottom described kind of plant hole 2.Described kind of plant hole 2 arranges kind of plant hole 2 according to transplanting soil ball 3 size requirement
The length of side, the degree of depth so that the size planting plant hole 2 matches with described transplanting soil ball 3.When excavation kind plant hole 2, reduce plantation
The height of surrounding bottom cave 2, and gradually raise in the middle part of hole, cave, form arc boss 4, be similar to part sphere back-off in kind of a plant hole
The bottom of 2.
Preferably, the top of described arc boss 4 is ellipse hemisphere, the equatorial radius of described ellipse hemisphere and described kind of plant hole 2
The length of side identical, and the ratio of the equatorial radius of described ellipse hemisphere and polar radius is (1.5～3): 1.From described arc boss 4
For cross section, namely: plant the ratio forming semiellipse, its major radius and short radius bottom plant hole 2 between peak and minimum point
For (1.5～3): 1, semielliptical long diameter is consistent with the length of side planting plant hole 2.It is configured like the ellipse hemispherical in " the bottom of a pan "
Formula is conducive to unnecessary water body to be first pooled to the bottom surrounding of described kind of plant hole 2, it is to avoid transplanting soil ball 3 root suffers water
Flood, reaches to protect root and promotees the purpose of root.
Wherein, described collection and purification mechanism is the clarifier-tank 13 that top is provided with outlet 11, the internal bag of described clarifier-tank 13
Include set gradually from bottom to top cobblestone layer 8, metalling 9, zeolite layer 10, Flyash Layer 12, form ecological filtering layer.Such as Fig. 1
Shown in, distance plants the clarifier-tank 13 arranging rainwater at plant hole 20～30cm in the horizontal direction, bottom described clarifier-tank 13 and water conservancy diversion
Mechanism connection.Preferably, described clarifier-tank 13 is formed by ventilation anti-seepage sand is prefabricated, its profile be the length of side 60～80cm pros
Body, after preventing collection and purification, water body runs off；Top arranges hole, the replacing of convenient each ecological filtering layer internal.
Specifically, in clarifier-tank 13, comprise four layers of ecological filtering layer, be followed successively by cobblestone layer 8, metalling 9, boiling from the bottom to top
Rock layers 10 and Flyash Layer 12, the described cobblestone layer 8 of big particle diameter ecology filtering layer, metalling 9, zeolite layer 10 are by mesh grid
Be respectively coated by cobblestone, rubble, zeolite lay form, described Flyash Layer 12 by non-woven fabrics coated composite powder coal ash lay form.Its
Described in cobblestone layer 8, metalling 9, zeolite layer 10, the thickness of Flyash Layer 12 be 15～20cm, and described cobblestone
Layer 8, metalling 9, zeolite layer 10 cobble, rubble, the particle diameter of zeolite are the specification of 3～6cm.
When being in rainy day, by each ecological filtering layer bottom to upstream under the effect of the pressure that rainwater is formed at gravity
Dynamic, the pollutant contained in rainwater are in physical chemistry biology mistakes such as absorption, filtration, microbial decomposition absorption, redox reaction
Obtain part under Cheng Zuoyong to remove, reach the purpose of preliminary purification of water quality, and discharge from the outlet being arranged on clarifier-tank top,
It is collected and recycles.By said structure, the present invention within getting rid of kind of plant hole in time and around on the basis of hydrops, will be many
Remaining water body carries out cleansing and recycling, and simple in construction, effect are obvious, it is easy to promote.
Wherein, described deflector includes being arranged on the vertical pod apertures 7 at described arc boss 4 edge, two ends connect respectively
Connect the curb 6 of described vertical pod apertures 7 and cobblestone layer 8.The present invention is bottom the kind plant hole 2 of the growing body set four
Week namely beat vertical pod apertures 7 at arc boss 4 edge drill rod, described vertical pod apertures 7 a diameter of 5～8cm, convex with arc
Platform 4 edge least significant end is the starting point vertical direction degree of depth 30～50cm.And in the horizontal direction, punching forms described curb 6, long
20～30cm.
Preferably, being at least partly filled with particle diameter in described vertical pod apertures 7 and described curb 6 is 0.2～0.35cm
Thick medium sand, on the one hand can fast guiding hydrops, on the other hand may also function as tentatively filtering, prevent from soil impurity from flowing into collecting dress
The effect put.It is provided with anti-backflow switch in described curb 6, is beneficial to unnecessary water body and imports in clarifier-tank 13 along curb 6,
And effectively prevent hydraulic pressure deficiency and kind of plant hole 2 is formed and pours in down a chimney.
Further, it is preferable that the surface of arc boss 4, vertical pod apertures 7 and described curb 6 at least partly covers
There is water-release fibre thin film 5, be beneficial to water transport fortune.
The draining kind plant hole structure of the cleansing and recycling of the present invention of the present invention is by growing body, deflector, collection and purification
Mechanism three part composition, can discharge the unnecessary water body in cohesive soil kind plant hole in time, it is to avoid transplants soil ball and is soaked, reduces Seedling
Wood survival rate, and water body unnecessary in plant pit is carried out cleansing and recycling.Wherein, the spy that, breathability permeable for cohesive soil is poor
Point, uses similar " the bottom of a pan " of arc boss to plant plant hole, and utilizes hydraulic pressure effect to pass through ecological filtering layer from bottom to top to water body
Carry out preliminary purification, within time getting rid of kind of plant hole and around on the basis of hydrops, unnecessary water body is carried out cleansing and recycling, has
Have simple in construction, effect substantially, promote easy feature.
The draining kind plant hole structure of the cleansing and recycling of the present invention can refer to following method and builds:
1) on-the-spot preparation.Site clearing, domatic, soil property reaches to design requirement, prepares material.
2) growing body is set.Determine the size of kind of plant hole 2 according to the demand of transplanting 1, meet the requirements, excavate plantation
Cave 2 also requires to build arc boss according to design.
3) deflector is set.Vertical pod apertures 7, curb 6 is beaten respectively with drill rod, and in vertical pod apertures 7 and institute
Fill thick medium sand in stating curb 6, reach to design requirement.
4) assembling collection and purification mechanism.First by the husky prefabricated clarifier-tank 13 of antiseepage, and cobblestone is laid by mesh grid cladding
Layer 8, metalling 9, zeolite layer 10, go up by non-woven fabrics cladding laying Flyash Layer 12, and be sequentially filled after clarifier-tank 13, envelope most
Close the hole of clarifier-tank.
5) outlet 11 on collection and purification mechanism top is accessed pipe network, the water body after preliminary purification is circulated profit again
With.
The present invention incorporates rainwater purification reuse theory, forms the kind plant hole draining being suitable for cohesive soil transplanting nursery stock
And the structure of cleansing and recycling.And from water body collection device front end, incorporate physical chemistry bioprocess, formed at the beginning of water body
Step purifies, and devises a kind of unnecessary water body utilizing kind of plant hole to discharge and carries out purifying and reuse, farthest improves nursery stock
Survival rate and the recycling of water resource, it is adaptable to the transplanting of the big scale of construction nursery stock such as cohesive soil Regional City shade tree.
Finally should be noted that: above example is only in order to illustrate that technical scheme is not intended to limit；To the greatest extent
The present invention has been described in detail by pipe with reference to preferred embodiment, and those of ordinary skill in the field are it is understood that still
The detailed description of the invention of the present invention can be modified or portion of techniques feature is carried out equivalent；Without deviating from this
The spirit of bright technical scheme, it all should be contained in the middle of the technical scheme scope that the present invention is claimed.
Claims (8)
1. the draining kind plant hole structure of a cleansing and recycling, it is characterised in that: described draining kind plant hole structure includes transplanting of planting
The growing body of trees (1), at least one is arranged on the other collection and purification mechanism of described growing body, connects described plantation respectively
Mechanism bottom and the deflector of collection and purification mechanism bottom, described growing body includes and transplanting soil ball (3) specification chi
The very little kind plant hole (2) matched and be arranged on the arc boss (4) of described kind of plant hole (2) bottom, described collection and purification mechanism
The clarifier-tank (13) of outlet (11) it is provided with, the internal goose ovum including setting gradually from bottom to top of described clarifier-tank (13) for top
Rock layers (8), metalling (9), zeolite layer (10), Flyash Layer (12), described deflector includes being arranged on described arc boss
(4) the vertical pod apertures (7) at edge, two ends connect the curb (6) of described vertical pod apertures (7) and cobblestone layer (8) respectively.
Draining kind plant hole structure the most according to claim 1, it is characterised in that: a diameter of the 5 of described vertical pod apertures (7)
～8cm, the degree of depth is 30～50cm；A length of the 20～30cm of described curb (6).
Draining kind plant hole structure the most according to claim 1, it is characterised in that: described vertical pod apertures (7) and described lead
At least partly it is filled with, in stream ditch (6), the thick medium sand that particle diameter is 0.2～0.35cm.
Draining kind plant hole structure the most according to claim 1, it is characterised in that: described curb is provided with anti-backflow in (6)
Switch.
Draining kind plant hole structure the most according to claim 1, it is characterised in that: described clarifier-tank (13) is by ventilation anti-seepage sand
Prefabricated forming, top arranges hole.
Draining kind plant hole structure the most according to claim 1, it is characterised in that: described cobblestone layer (8), metalling (9),
Zeolite layer (10) is formed by mesh grid cladding laying, and described Flyash Layer (12) is formed by non-woven fabrics cladding laying.
Draining kind plant hole structure the most according to claim 1, it is characterised in that: described cobblestone layer (8), metalling (9),
Zeolite layer (10), the thickness of Flyash Layer (12) are 15～20cm, and described cobblestone layer (8), metalling (9), zeolite
Layer (10) cobble, rubble, the particle diameter of zeolite are 3～6cm.
Draining kind plant hole structure the most according to claim 1, it is characterised in that: the top of described arc boss (4) is ellipse
Hemisphere, the equatorial radius of described ellipse hemisphere is identical with the length of side of described kind of plant hole (2), and the equatorial radius of described ellipse hemisphere with
The ratio of polar radius is (1.5～3): 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610773479.1A CN106171616A (en) | 2016-08-30 | 2016-08-30 | A kind of draining kind plant hole structure of cleansing and recycling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610773479.1A CN106171616A (en) | 2016-08-30 | 2016-08-30 | A kind of draining kind plant hole structure of cleansing and recycling |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106171616A true CN106171616A (en) | 2016-12-07 |
Family
ID=58089622
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610773479.1A Pending CN106171616A (en) | 2016-08-30 | 2016-08-30 | A kind of draining kind plant hole structure of cleansing and recycling |
Country Status (1)
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| CN (1) | CN106171616A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107245020A (en) * | 2017-06-05 | 2017-10-13 | 绿地集团森茂园林有限公司 | Controlled Release Fertilizer and the tree pond using the Controlled Release Fertilizer |
| CN107750734A (en) * | 2017-11-20 | 2018-03-06 | 北京星河园林景观工程有限公司 | A kind of multi-functional double cofferdam Shu Chi |
| CN108118704A (en) * | 2017-11-27 | 2018-06-05 | 江苏澳洋生态园林股份有限公司 | Multiple green reparation structure of a kind of water storage water conservation massif and preparation method thereof |
| CN110432105A (en) * | 2019-08-31 | 2019-11-12 | 红河胜农生态农业生物科技有限公司 | A kind of implantation methods of the bletilla striata |
| CN110915601A (en) * | 2019-10-18 | 2020-03-27 | 长江大学 | Method for solving ventilation around transplanted seedling soil ball |
| WO2020244177A1 (en) * | 2019-06-03 | 2020-12-10 | 广东美景环境科技有限公司 | Roadside tree planting hole structure and construction method therefor |
| CN113016475A (en) * | 2021-03-04 | 2021-06-25 | 西安建工园林工程有限公司 | Tree planting method in soil moisture saturation area |
| CN113892385A (en) * | 2021-09-29 | 2022-01-07 | 广州城建职业学院 | Arbor planting process with improved 'reverse pot bottom' form |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107245020A (en) * | 2017-06-05 | 2017-10-13 | 绿地集团森茂园林有限公司 | Controlled Release Fertilizer and the tree pond using the Controlled Release Fertilizer |
| CN107750734A (en) * | 2017-11-20 | 2018-03-06 | 北京星河园林景观工程有限公司 | A kind of multi-functional double cofferdam Shu Chi |
| CN108118704A (en) * | 2017-11-27 | 2018-06-05 | 江苏澳洋生态园林股份有限公司 | Multiple green reparation structure of a kind of water storage water conservation massif and preparation method thereof |
| WO2020244177A1 (en) * | 2019-06-03 | 2020-12-10 | 广东美景环境科技有限公司 | Roadside tree planting hole structure and construction method therefor |
| CN110432105A (en) * | 2019-08-31 | 2019-11-12 | 红河胜农生态农业生物科技有限公司 | A kind of implantation methods of the bletilla striata |
| CN110915601A (en) * | 2019-10-18 | 2020-03-27 | 长江大学 | Method for solving ventilation around transplanted seedling soil ball |
| CN113016475A (en) * | 2021-03-04 | 2021-06-25 | 西安建工园林工程有限公司 | Tree planting method in soil moisture saturation area |
| CN113016475B (en) * | 2021-03-04 | 2023-09-22 | 蒲恒恒 | Tree planting method in soil moisture saturation area |
| CN113892385A (en) * | 2021-09-29 | 2022-01-07 | 广州城建职业学院 | Arbor planting process with improved 'reverse pot bottom' form |
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Application publication date: 20161207 |