AU2017100488A4 - Desalination method for improving topsoil of saline-alkali land by using silt - Google Patents
Desalination method for improving topsoil of saline-alkali land by using silt Download PDFInfo
- Publication number
- AU2017100488A4 AU2017100488A4 AU2017100488A AU2017100488A AU2017100488A4 AU 2017100488 A4 AU2017100488 A4 AU 2017100488A4 AU 2017100488 A AU2017100488 A AU 2017100488A AU 2017100488 A AU2017100488 A AU 2017100488A AU 2017100488 A4 AU2017100488 A4 AU 2017100488A4
- Authority
- AU
- Australia
- Prior art keywords
- silt
- saline
- topsoil
- alkali land
- mixed zone
- 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.)
- Ceased
Links
Landscapes
- Cultivation Of Plants (AREA)
Abstract
A desalination method for improving topsoil of a saline-alkali land by using silt is disclosed. The method includes the following steps: (a) mixing topsoil of a saline-alkali land with silt, to form a mixed zone with a permeability coefficient of 1.Ox10-6 cm/s to 5.Ox1 0-5 cm/s; (b) building ridges around the mixed zone using silt, irrigating the mixed zone with fresh water for 2 to 4 months, and keeping a water depth of between 10 cm and 15 cm; and (c) planting rice in the mixed zone, and draining and irrigating the rice according to the growth characteristics and needs of the rice. Through mixing of topsoil of a saline-alkali land and silt, a mixed zone with a certain permeability coefficient is formed. In this way, a structure of the topsoil of the saline-alkali land can be improved, the soil fertility is improved, suitable conditions for the growth of rice are created, and a yield of the rice is improved. Moreover, after the structure of the topsoil of the saline-alkali land is improved by mixing with the silt, a permeability coefficient of the topsoil is decreased, and a permeation rate of a fresh water-containing soil layer is decreased, so that less fresh water can be used to maintain continuous downward permeation of fresh water, achieving salt-leaching and salt-reducing effects.
Description
r- ο (N δ' Ο 00 00 ο ο r- ο (Ν
DESALINATION METHOD FOR IMPROVING TOPSOIL OF SALINE-ALKALI LAND BY USING SILT
BACKGROUND OF THE INVENTION
Field of the Invention
The present invention belongs to the field of saline-alkali land improvement, and relates to a method for improving a saline-alkali land, and more particularly, to a desalination method for improving topsoil of a saline-alkali land by using silt.
Description of Related Art
Land is a non-renewable resource, and with increasing population, the contradiction between people and land becomes increasingly acute. Coastal tidelands are the largest reserved land resources in China. An area of the tidelands in China is Λ approximately 2.5 million hm , and the tidelands extend to the sea at a land-forming Λ speed of about 5000 hm per year. Development and utilization of tidelands can greatly increase cultivated lands, and relieve the contradiction between people and land. However, currently, high saltness of tideland soil, high mineralization of underground water, and severe soil salinization are main factors limiting development and utilization of the tidelands. In addition, saline-alkali lands in tidelands belong to the texture of sandy silt, which has high water permeability, is infertile, and is hard to supply adequate nutrients to plants for growth. This is also one of the factors limiting development of the tidelands.
As desilting works of the Taihu Lake are carried out, a large amount of silt (the silt refers to mud generated from desilting of a river or a lake) is generated each year. Such silt contains abundant organic matters and nutrient substances such as N and P, and has a relatively small quantity of heavy metals and poisonous and harmful substances. A small amount of silt is often returned into the field, so as to improve the soil fertility. At present, a very large amount of silt is generated from the desilting works, and requires many yards for storage of silt, so that many land resources are occupied.
Currently, widely used desalination technologies of saline-alkali lands mainly ο Η Ο (Ν δ' Ο (X) 00 ο ο r- ο (Ν include a desalination technology with leaching using fresh water and a desalination teehnology with water drainage and exchange in rice planting. The leaching desalination method is mainly to directly leach a saline-alkali land using atmospheric precipitation or through irrigation. Due to a large permeability coeffieient of soil of the saline-alkali land, the leaching liquid permeates downwards quiekly in the leaehing proeess, and permeates through the soil horizon quickly. Therefore, in the leaehing proeess, a large amount of water needs to be consumed, eausing a waste of water resourees, and the time of leaching desalination is relatively long. If the teehnology of water drainage and exchange in rice planting is used to desalinate the saline-alkali land, the growth of rice is slow and the yield of riee is low, due to infertility of and deficit in nutrient elements of soil of the saline-alkali land. Therefore, there is a need to design a new method for improving a saline-alkali land.
SUMMARY OF THE INVENTION
An objective of the present invention is to provide a desalination method for improving topsoil of a saline-alkali land by using silt, so as to overcome the disadvantages of the prior art.
To achieve the foregoing objeetive, a technical solution used in the present invention is: a desalination method for improving topsoil of a saline-alkali land by using silt, sequentially ineluding the following steps: (a) mixing topsoil of a saline-alkali land with silt, to form a mixed zone; (b) building ridges around the mixed zone, irrigating the mixed zone with fresh water for at least two months, and keeping a water depth of between 10 cm and 15 cm, to perform salt-leaching by permeating the mixed zone with Ifesh water; and (c) planting rice in the mixed zone, and draining and irrigating the rice aeeording to the growth characteristies and needs of the rice.
Preferably, in step (a), the silt is laid on a surface layer of the saline-alkali land, and then the silt and the topsoil of the saline-alkali land are mechanically or manually stirred to be uniformly mixed.
Preferably, in step (a), topsoil having a depth of 40 cm in the surface layer of the saline-alkali land is mixed with the silt.
ο (N Ο 00 00 ο ο r- ο (Ν
Preferably, the silt is generated from desilting of a river or a lake.
Further, the silt has a moisture content of 100% to 150%, a content of N of 500 mg/kg to 600 mg/kg, and a content of P of 400 mg/kg to 500 mg/kg.
Further, the percent by weight of the silt relative to the topsoil of the saline-alkali land is 15% to 20%.
Preferably, in step (b), the water depth is kept at 10 to 15 cm for 2 to 4 months.
Preferably, in step (b), the silt is used to build the ridges.
Further, in step (c), a water depth on the earth surface in the mixed zone is ensured to be 15 cm to 20 cm in a water-demanding period for growth of the rice.
Preferably, a permeability coefficient of the topsoil improved by the method is 5.0x10^ cm/s to l.OxlO*’ cm/s.
With the foregoing technical solutions, the present invention has the following advantages compared with the prior art: in the desalination method for improving topsoil of a saline-alkali land by using silt of the present invention, topsoil of a saline-alkali land and silt are mixed to form a mixed zone. In this way, a structure of the topsoil of the saline-alkali land can be improved, the soil fertility is improved, suitable conditions for the growth of rice are created, and a yield of the rice is improved. Moreover, after the stmcture of the topsoil of the saline-alkali land is improved by mixing with the silt, a permeability coefficient of the topsoil is decreased, and a permeation rate of a fresh water-containing soil layer is decreased, so that less fresh water can be used to maintain continuous downward permeation of fresh water, achieving salt-leaching and salt-reducing effects and effectively preventing accumulation of salt in the surface soil due to the rise of capillary water. In addition, since a large amount of silt needs to be used in the improvement, treatment of the silt is done while a saline-alkali land is desalinated and soil is improved, and the problem that many yards for storage are required in the desilting works is solved.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram according to an embodiment of a desalination method for improving topsoil of a saline-alkali land by using silt. ο (N δ' Ο 00 00 ο ο ο (Ν
DETAILED DESCRIPTION OF THE INVENTION
The present invention provides a desalination method for improving topsoil of a saline-alkali land by using silt. The method sequentially includes the following steps: (a) mixing topsoil of a saline-alkali land with silt, to form a mixed zone; (b) building ridges around the mixed zone, irrigating the mixed zone with fresh water for at least two months, and keeping a water depth of between 10 cm and 15 cm, to perform salt-leaching by permeating the mixed zone with fresh water; and (c) planting rice in the mixed zone, and draining and irrigating the rice according to the growth characteristics and needs of the rice. Since the silt is rich in nutrient substances such as N and P and the amounts of heavy metals and poisonous and harmful substances are less than the soil environmental quality standards, a structure of the topsoil of the saline-alkali land can be improved, the soil fertility is improved, suitable conditions for the growth of rice are created, and a yield of the rice is improved. Moreover, since the silt particles are relatively small and the clay content is relatively high, mixing the silt with topsoil of a saline-alkali land of a tideland can reduce a permeability coefficient of a surface layer of the saline-alkali land, reduce a permeation rate of fresh water, and ensure continuous downward permeation of the fresh water for irrigation, achieving salt-leaching and salt-reducing effects and effectively avoiding accumulation of salt in the surface soil due to the rise of capillary water. In addition, since a large amount of silt needs to be used in the improvement, treatment of the silt is done while a saline-alkali land is desalinated and soil is improved, and the problem that many yards for storage are required in the desilting works is solved.
In step (a), the silt is laid on a surface layer of the saline-alkali land, and the silt and the topsoil of the saline-alkali land are mechanically or manually stirred to be uniformly mixed. In this way, the operational difficulty in mixing the silt and the topsoil of the saline-alkali land can be greatly reduced, and the mixing efficiency is improved. In step (a), preferably, topsoil having a depth of 40 cm in the surface layer of the saline-alkali land is mixed with the silt. The silt is generated from desilting of a river or a lake. A moisture content of the silt is preferably 100% to 150%, a content of N is preferably 500 mg/kg to 600 mg/kg, and a content of P is preferably 400 mg/kg to 500 mg/kg. The percent by weight of the silt relative to the topsoil of the saline-alkali land is 15% to 20%. As such, the topsoil obtained after mixing is performed in the mixed zone has excellent permeability coefficient, and the
ο (N Ο 00 00 ο ο ο (Ν desalination effect is good. In step (b), the water depth is preferably kept at 10 cm to 15 cm for 2 to 4 months, and the silt is preferably used to build the ridges. In step (c), it is ensured that water is continuously supplied to the earth surface of the mixed zone in a water-demanding period for growth of the rice, and the water depth is between 15 cm and 20 cm, to meet the requirements for growth of the rice, penetration, and desalination. The topsoil improved by the method has an optimized permeability coefficient of 5.0x10^ cm/s to l.OxlO*’ cm/s, so that continuous downward permeation of fresh water for irrigation can be fully ensured, improving the salt-leaching and salt-reducing effects.
Preferred embodiments of the present invention are described below in detail with reference to the accompanying drawings.
Example 1
This example provides a desalination method for improving topsoil of a saline-alkali land by using silt, including the following steps: (a) laying silt (it is measured to have a content of N of 500 mg/kg and a eontent of P of 400 mg/kg) with a moisture content of 100% on a surfaee layer of a saline-alkali land; then mixing topsoil having a depth of 40 em in the surface layer of the saline-alkali land with the silt (the pereent by weight of the silt relative to the topsoil is 15%) with stirring, to form a mixed zone, that is, an improved zone, with a permeability coefficient of 5.0x10^ em/s; (b) building ridges around the mixed zone using silt, irrigating the mixed zone with Iresh water, and keeping a water depth of 10 cm for 2 months; and (c) planting rice in the mixed zone, where it is ensured that water is continuously supplied to the earth surface of the mixed zone in a water-demanding period for growth of the rice, and the water depth is 15 cm, and draining and irrigating the riee according to the growth characteristics and needs of the riee.
Example 2
This example provides a desalination method for improving topsoil of a saline-alkali land by using silt, including the following steps: (a) laying silt (it is measured to have a eontent of N of 600 mg/kg and a eontent of P of 500 mg/kg) with a moisture eontent of 150% on a surface layer of a
ο (N Ο 00 00 ο ο r- ο (Ν saline-alkali land; then mixing topsoil having a depth of 30 cm in the surface layer of the saline-alkali land with the silt (the percent by weight of the silt relative to the topsoil is 20%) with stirring, to form a mixed zone with a permeability coefficient of 1.0x10^ cm/s; (b) building ridges around the mixed zone using silt, irrigating the mixed zone with fresh water, and keeping a water depth of 15 cm for 4 months; and (c) planting rice in the mixed zone, where it is ensured that water is continuously supplied to the earth surface of the mixed zone in a water-demanding period for growth of the rice, and the water depth is 20 cm, and draining and irrigating the rice according to the growth characteristics and needs of the rice.
Example 3
This example provides a desalination method for improving topsoil of a saline-alkali land by using silt, including the following steps: (a) laying silt (it is measured to have a content of N of 550 mg/kg and a content of P of 450 mg/kg) with a moisture content of 120% on a surface layer of a saline-alkali land; then mixing topsoil having a depth of 25 cm in the surface layer of the saline-alkali land with the silt (the percent by weight of the silt relative to the topsoil is 18%) with stirring, to form a mixed zone, that is, an improved zone, with a permeability coefficient of 9.0x10^ cm/s; (b) building ridges around the mixed zone using silt, irrigating the mixed zone with fresh water, and keeping a water depth of 12 cm for 3 months; and (c) planting rice in the mixed zone, where it is ensured that water is continuously supplied to the earth surface of the mixed zone in a water-demanding period for growth of the rice, and the water depth is 18 cm, and draining and irrigating the rice according to the growth characteristics and needs of the rice.
Comparative example 1
This comparative example provides a desalination method for improving topsoil of a saline-alkali land by using silt. The procedure of the comparative example is substantially identical to that in Embodiment 1. The difference is that the percent by weight of the laid silt relative to the topsoil is 30%, resulting in too small permeability coefficient, poor salt-leaching effect, and poor growth of the rice.
r- ο (N
O
The foregoing embodiments are merely used to describe the technical concept and features of the present invention, to enable those skilled in the art to understand and implement the content of the present invention, and are not intended to limit the protection scope of the present invention. Any equivalent change or modification made according to the spirit and essence of the present invention shall fall within the protection scope of the present invention.
00 00 o o r- o (N
Claims (10)
- The claims defining the invention are as follows:1. A desalination method for improving topsoil of a saline-alkali land by using silt, sequentially comprising the following steps: (a) mixing topsoil of a saline-alkali land with silt, to form a mixed zone; (b) building ridges around the mixed zone, irrigating the mixed zone with fresh water for at least two months, and keeping a water depth of between 10 cm and 15 cm, to perform salt-leaching by permeating the mixed zone with fresh water; and (c) planting rice in the mixed zone, and draining and irrigating the rice according to the growth characteristics and needs of the rice.
- 2. The desalination method for improving topsoil of a saline-alkali land by using silt according to claim 1, wherein in step (a), the silt is laid on a surface layer of the saline-alkali land, and then the silt and the topsoil of the saline-alkali land are mechanically or manually stirred to be uniformly mixed.
- 3. The desalination method for improving topsoil of a saline-alkali land by using silt according to claim 1, wherein in step (a), topsoil having a depth of 40 cm in the surface layer of the saline-alkali land is mixed with the silt.
- 4. The desalination method for improving topsoil of a saline-alkali land by using silt according to claim 1, wherein the silt is generated from desilting of a river or a lake.
- 5. The desalination method for improving topsoil of a saline-alkali land by using silt according to claim 4, wherein the silt has a moisture content of 100% to 150%, a content of N of 500 mg/kg to 600 mg/kg, and a content of P of 400 mg/kg to 500 mg/kg.
- 6. The desalination method for improving topsoil of a saline-alkali land by using silt according to claim 1, 4, or 5, wherein the percent by weight of the silt relative to the topsoil of the saline-alkali land is 15% to 20%.
- 7. The desalination method for improving topsoil of a saline-alkali land by using silt according to claim 1, wherein in step (b), the water depth is kept at 10 cm to 15 cm for 2 to 4 months.
- 8. The desalination method for improving topsoil of a saline-alkali land by using silt according to claim 1, wherein in step (b), the silt is used to build the ridges.
- 9. The desalination method for improving topsoil of a saline-alkali land by using silt according to claim 1 or 2, wherein in step (c), a water depth on the earth surface in the mixed zone is ensured to be 15 cm to 20 cm in a water-demanding period for growth of the rice.
- 10. The desalination method for improving topsoil of a saline-alkali land by using silt according to claim 1, wherein a permeability coefficient of the topsoil improved by the method is 5.0xl05 cm/s to l.OxlO6 cm/s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2017100488A AU2017100488A4 (en) | 2015-07-13 | 2017-05-04 | Desalination method for improving topsoil of saline-alkali land by using silt |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510409902.5 | 2015-07-13 | ||
| PCT/CN2016/070028 WO2017008473A1 (en) | 2015-07-13 | 2016-01-04 | Desalination method by using sludge to improve topsoil of saline and alkaline land |
| AU2017100488A AU2017100488A4 (en) | 2015-07-13 | 2017-05-04 | Desalination method for improving topsoil of saline-alkali land by using silt |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/CN2016/070028 Division WO2017008473A1 (en) | 2015-07-13 | 2016-01-04 | Desalination method by using sludge to improve topsoil of saline and alkaline land |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| AU2017100488A4 true AU2017100488A4 (en) | 2017-06-15 |
Family
ID=59019549
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2017100488A Ceased AU2017100488A4 (en) | 2015-07-13 | 2017-05-04 | Desalination method for improving topsoil of saline-alkali land by using silt |
Country Status (1)
| Country | Link |
|---|---|
| AU (1) | AU2017100488A4 (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108999157A (en) * | 2018-07-05 | 2018-12-14 | 水利部交通运输部国家能源局南京水利科学研究院 | A kind of processing method significantly improving coastal saline soil physical property |
| CN109168392A (en) * | 2018-09-23 | 2019-01-11 | 宁波高智科技咨询服务有限公司 | A kind of synthesis improvement method in salt-soda soil |
| CN110178479A (en) * | 2019-07-03 | 2019-08-30 | 中电建十一局工程有限公司 | A kind of modification method of saline-alkali soil |
| CN112166727A (en) * | 2020-09-22 | 2021-01-05 | 陕西秦草生态环境科技有限公司 | Method for improving saline-alkali soil on two sides of river |
| CN112166733A (en) * | 2020-10-30 | 2021-01-05 | 东盛生态科技股份有限公司 | Planting and maintaining method for saline-alkali soil protection forest |
| CN112205112A (en) * | 2020-08-24 | 2021-01-12 | 天津长芦汉沽盐场有限责任公司 | Saline-alkali soil improvement method |
| CN115362782A (en) * | 2022-08-29 | 2022-11-22 | 宁夏滨泽新能源科技有限公司 | Method for improving soil property by sludge |
-
2017
- 2017-05-04 AU AU2017100488A patent/AU2017100488A4/en not_active Ceased
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108999157A (en) * | 2018-07-05 | 2018-12-14 | 水利部交通运输部国家能源局南京水利科学研究院 | A kind of processing method significantly improving coastal saline soil physical property |
| CN109168392A (en) * | 2018-09-23 | 2019-01-11 | 宁波高智科技咨询服务有限公司 | A kind of synthesis improvement method in salt-soda soil |
| CN110178479A (en) * | 2019-07-03 | 2019-08-30 | 中电建十一局工程有限公司 | A kind of modification method of saline-alkali soil |
| CN112205112A (en) * | 2020-08-24 | 2021-01-12 | 天津长芦汉沽盐场有限责任公司 | Saline-alkali soil improvement method |
| CN112166727A (en) * | 2020-09-22 | 2021-01-05 | 陕西秦草生态环境科技有限公司 | Method for improving saline-alkali soil on two sides of river |
| CN112166733A (en) * | 2020-10-30 | 2021-01-05 | 东盛生态科技股份有限公司 | Planting and maintaining method for saline-alkali soil protection forest |
| CN115362782A (en) * | 2022-08-29 | 2022-11-22 | 宁夏滨泽新能源科技有限公司 | Method for improving soil property by sludge |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| AU2017100488A4 (en) | Desalination method for improving topsoil of saline-alkali land by using silt | |
| WO2017008473A1 (en) | Desalination method by using sludge to improve topsoil of saline and alkaline land | |
| CN103329658B (en) | A kind of saline land, tidal land new reclamation area quick desalination is improved the soil broken isometric structure | |
| WO2016172991A1 (en) | Water purification system requiring no power for riparian area of artificial wetland | |
| CN105359660B (en) | A kind of method and system for improveing saline-alkali soil | |
| EP3789353B1 (en) | Ecological remediation method for water bodies rich in high-turbidity colloidal particles | |
| CN202503890U (en) | Water and soil improvement system of saline and alkaline land | |
| CN107853093B (en) | Biological modifier for beach saline-alkali soil and preparation method and application thereof | |
| CN102870523B (en) | Terrain processing method for improving seashore solonchak | |
| CN103642501A (en) | Saline-alkali soil improving agent | |
| CN105960875B (en) | A kind of method using charcoal bed course improvement Coastal beach alkaline land soil | |
| CN105144895A (en) | Method for quickly desalinizing mud flat saline and alkaline land by laying sludge on surface layer | |
| CN203213085U (en) | Saline and alkaline land greening salt elimination and soil moisture conservation waterscape constructing system | |
| CN106718602A (en) | A kind of transplanted seedling tree method on the coral sand of newly-built tropical hydraulic reclamation islands and reefs | |
| CN105432177A (en) | Rapid treatment method for coastal salt marsh | |
| CN102498772A (en) | Method for in-situ improvement of dredger fill into soil for planting | |
| Qureshi | Challenges and opportunities of groundwater management in Pakistan | |
| Wang et al. | Types, harms and improvement of saline soil in Songnen Plain | |
| CN101138287A (en) | Desert greening water and soil conservation method and structure | |
| CN114846942A (en) | Method for improving soil | |
| CN102144523A (en) | Sidewalk-frozen tree planting method for coastal saline-salt soil | |
| CN104186178A (en) | Economical seashore saline soil greening quick planting method | |
| CN204090476U (en) | The ecology structure of improvement waters, river course degenerated soil | |
| CN104148377A (en) | Method for producing greened structure soil from silt | |
| CN206467526U (en) | A kind of sloping upland agricultural ecological road canal |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FGI | Letters patent sealed or granted (innovation patent) | ||
| MK22 | Patent ceased section 143a(d), or expired - non payment of renewal fee or expiry |