CN105052290A - Desalination method by using sludge to improve topsoil of saline and alkaline land - Google Patents
Desalination method by using sludge to improve topsoil of saline and alkaline land Download PDFInfo
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- CN105052290A CN105052290A CN201510409902.5A CN201510409902A CN105052290A CN 105052290 A CN105052290 A CN 105052290A CN 201510409902 A CN201510409902 A CN 201510409902A CN 105052290 A CN105052290 A CN 105052290A
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- mud
- topsoil
- saline land
- carry out
- desalination
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01B—SOIL WORKING IN AGRICULTURE OR FORESTRY; PARTS, DETAILS, OR ACCESSORIES OF AGRICULTURAL MACHINES OR IMPLEMENTS, IN GENERAL
- A01B79/00—Methods for working soil
- A01B79/02—Methods for working soil combined with other agricultural processing, e.g. fertilising, planting
Abstract
The present invention relates to a desalination method by using sludge to improve topsoil of a saline and alkaline land. The method includes the following steps: a) mixing the topsoil of the saline and alkaline land and the sludge to form a mixed zone having a permeability coefficient ranging from 1.0*10-6 to 5.0*10-5 cm/s; b) using sludge to build ridges around the mixed zone, irrigating the mixed zone with fresh water for 2 to 4 months, and keeping a water depth in a range from 10 to 15 cm; c) planting rice in the mixed zone, and irrigating and draining the rice according to the growth characteristics and need of rice. Through a mixture of the topsoil of the saline and alkaline land and the sludge, the mixed zone having the certain permeability coefficient is formed, a structure of the topsoil of saline and alkaline land can be improved, the soil fertility can be increased, the appropriate growth conditions of the rice can be created, and the yield of the rice can be improved. After the structure of the topsoil of the saline and alkaline land can be improved by mixing the sludge, the permeability coefficient of the topsoil of the saline and alkaline land is decreased, the permeation rate of a fresh water soil layer is decreased, so that less fresh water can be used to maintain the continual permeation of the fresh water toward lower locations, and the salt-leaching and salt-reducing can be achieved.
Description
Technical field
The invention belongs to alkaline land improvement field, relate to a kind of method improveing saline land, be specifically related to a kind of method utilizing mud improvement saline land topsoil to carry out desalination.
Background technology
Soil is non-renewable resources, and along with the continuous increase of population, people ground contradiction is becoming increasingly acute.And the Coastal beach reserved resources that to be China soil maximum.China's beach area is about 2,500,000 hm
2, and annual with 5000hm
2the one-tenth Lu Sudu of left and right extends to sea.The development and utilization of beach large area can increase arable land, alleviates people ground contradiction.But the high salinity of current mud-flat soil, the high mineralization degree of underground water, soil salt marsh evil are seriously the key constraints that restriction shore reclamation utilizes.Meanwhile, belong to sandy silt soil property, water penetration is better, and soil property is barren beach saline-alkali, and being difficult to the sufficient nutrient of the growth of plant supply, is also one of factor of restriction shore reclamation.
Along with the expansion of Taihu Lake desilting engineering, a large amount of mud (mud that mud refers to river, lake dredging up produces) is had to produce every year.These mud contain the nutriments such as abundant organic matter and N, P, heavy metal and poisonous and harmful substance content lower.A small amount of mud is through being commonly used to go back field, to increase soil fertility.The amount of sludge that the desilting engineering of present stage produces is very huge, needs a lot of silt stockyard to stack, occupies a large amount of land resources.
Now widely used desalting salinized soil technology mainly fresh water Leaching and desalinization and Rice Cropping row changes water desalination technology.Leaching and desalinization method mainly adopts atmospheric precipitation or irrigates directly carries out drip washing to saline land, because alkaline land soil osmotic coefficient is comparatively large, leacheate in lessivation under ooze comparatively fast, fast strikethrough stratum.Therefore in lessivation, need the water of at substantial, cause the waste of water resource, the time of Leaching and desalinization is also relatively long.Adopt Rice Cropping row to change water technology and carry out desalination to saline land, then often because alkaline land soil is barren, Nutrient deficiency, cause paddy growth slow, output is extremely low.Therefore the method designing new improvement saline land is necessary.
Summary of the invention
The present invention seeks to provide a kind of method utilizing mud improvement saline land topsoil to carry out desalination to overcome the deficiencies in the prior art.
For achieving the above object, the technical solution used in the present invention is: a kind of method utilizing mud improvement saline land topsoil to carry out desalination, and it comprises the following steps of carrying out successively:
A saline land topsoil mixes with mud by (), form mixed zone;
B () encloses ridge around described mixed zone, irrigate fresh water, the maintenance depth of water is 10 ~ 15cm, continues more than 2 months, oozes the desalinization of soil by flooding or leaching under carrying out fresh water;
C () be rice cultivation in described mixed zone, and according to paddy growth feature and need to carry out row irrigation.
Optimally, in described step (a), lay mud on top layer, saline land, by machinery or artificial stirring, mud and saline land topsoil are mixed subsequently.
Optimally, in described step (a), the topsoil in the top layer 40cm of described saline land is mixed with mud.
Optimally, described mud be river, the mud that produces of lake dredging up.
Further, the moisture content of described mud is 100 ~ 150%, and N content is 500mg/kg ~ 600mg/kg, P content is 400mg/kg ~ 500mg/kg.
Further, the mass percent of described mud and described saline land topsoil is 15% ~ 20%.
Optimally, in step (b), the maintenance depth of water is 10 ~ 15cm, continues 2 ~ 4 months.
Optimally, in step (b), mud is adopted to enclose ridge.
Further, in step (c), described mixed zone surface-water depth is 15 ~ 20cm to need the water phase to ensure at paddy growth.
Optimally, the topsoil osmotic coefficient after described method improvement is 5.0 × 10
-5~ 1.0 × 10
-6cm/s.
Because technique scheme is used, the present invention compared with prior art has following advantages: the present invention utilizes mud improvement saline land topsoil to carry out the method for desalination, mixed zone is formed after being mixed with mud by saline land topsoil, like this can saline land topsoil structure, increase soil fertility, build the condition being applicable to paddy growth, improve rice yield; And after saline land topsoil and mud is mixed to get improvement, its osmotic coefficient reduces, the infiltration rate of fresh water soil layer reduces, less fresh water amount can be used to keep fresh water lasting infiltration downwards, reach the desalinization of soil by flooding or leaching and press salty effect, and effectively can prevent the accumulation of salt in the surface soil phenomenon because capillary water rising produces; Need during improvement in addition to use a large amount of mud, while desalination and soil melioration are carried out to saline land, complete the process of mud, solve the problem that a large amount of stockyard of desilting requirement of engineering is deposited.
Accompanying drawing explanation
The embodiment schematic diagram of accompanying drawing 1 for utilizing mud improvement saline land topsoil to carry out the method for desalination.
Embodiment
The present invention utilizes mud improvement saline land topsoil to carry out the method for desalination, and it comprises the following steps of carrying out successively: saline land topsoil mixes with mud by (a), forms mixed zone; B () encloses ridge around described mixed zone, irrigate fresh water, the maintenance depth of water is 10 ~ 15cm, continues more than 2 months, oozes the desalinization of soil by flooding or leaching under carrying out fresh water; C () be rice cultivation in described mixed zone, and according to paddy growth feature and need to carry out row irrigation.Due to have the nutriments such as N, P of rich content in mud and heavy metal and poisonous and harmful substance content lower than standard of soil environment quality value, like this can saline land topsoil structure, increase soil fertility, build the condition being applicable to paddy growth, improve rice yield; And sludge granules is less, clay content is higher, it is mixed with beach saline-alkali surface layer soil, the osmotic coefficient on top layer, saline land can be reduced, reduce fresh water infiltration rate, ensure to irrigate fresh water lasting infiltration downwards, play the desalinization of soil by flooding or leaching and press salty effect, and effectively can prevent the accumulation of salt in the surface soil phenomenon because capillary water rising produces; Need during improvement in addition to use a large amount of mud, while desalination and soil melioration are carried out to saline land, complete the process of mud, solve the problem that a large amount of stockyard of desilting requirement of engineering is deposited.
In described step (a), lay mud on top layer, saline land, by machinery or artificial stirring, mud and saline land topsoil are mixed subsequently, greatly can reduce the difficulty of construction of mud and the mixing of saline land topsoil like this, improve mixing efficiency; In step (a), the topsoil in the top layer 40cm of described saline land is preferably made to mix with mud.The mud that described mud is river, lake dredging up produces; The moisture content of described mud is preferably 100 ~ 150%, and N content is preferably 500mg/kg ~ 600mg/kg, P content is preferably 400mg/kg ~ 500mg/kg.The mass percent of described mud and described saline land topsoil is 15% ~ 20%, and such mixed zone mixed topsoil osmotic coefficient is more excellent, and desalting effect is better.In step (b), keep the depth of water be preferred 10 ~ 15cm, continue 2 ~ 4 months, preferably employing mud encloses ridge.In step (c), not cutting off the water supply in earth's surface, mixed zone to need the water phase to ensure at paddy growth, and the depth of water is 15 ~ 20cm, meets the needs of paddy growth and osmosis deaslination.Topsoil osmotic coefficient after described method improvement is 5.0 × 10
-5~ 1.0 × 10
-6cm/s, osmotic coefficient is now optimum, can fully ensure to irrigate fresh water lasting infiltration downwards, improves the desalinization of soil by flooding or leaching and presses salty effect.
Below in conjunction with accompanying drawing, the preferred embodiment of the invention is described in detail:
Embodiment 1
The present embodiment provides a kind of method utilizing mud improvement saline land topsoil to carry out desalination, and it comprises the following steps:
A mud that () is 100% at top layer, saline land laying moisture content (records its N content and is about 500mg/kg, P content is about 400mg/kg), soil in the topsoil 40cm degree of depth of saline land and mud are carried out mixing (mass percent of mud and topsoil is 15%) by stirring subsequently, forming osmotic coefficient is 5.0 × 10
-5the mixed zone of cm/s, namely improves district;
B () encloses ridge with mud around mixed zone, irrigate fresh water, the maintenance depth of water is 10cm, continues February;
C (), at described mixed zone place rice cultivation, not cutting off the water supply in earth's surface, mixed zone to need the water phase to ensure at paddy growth, and the depth of water is 15cm, and according to paddy growth feature and need to carry out row irrigation.
Embodiment 2
The present embodiment provides a kind of method utilizing mud improvement saline land topsoil to carry out desalination, and it comprises the following steps:
A mud that () is 150% at top layer, saline land laying moisture content (records its N content and is about 600mg/kg, P content is about 500mg/kg), soil in the topsoil 30cm degree of depth of saline land and mud are carried out mixing (mass percent of mud and topsoil is 20%) by stirring subsequently, forming osmotic coefficient is 1.0 × 10
-6the mixed zone of cm/s;
B () encloses ridge with mud around mixed zone, irrigate fresh water, the maintenance depth of water is 15cm, continues April;
C (), at described mixed zone place rice cultivation, not cutting off the water supply in earth's surface, mixed zone to need the water phase to ensure at paddy growth, and the depth of water is 20cm, and according to paddy growth feature and need to carry out row irrigation.
Embodiment 3
The present embodiment provides a kind of method utilizing mud improvement saline land topsoil to carry out desalination, and it comprises the following steps:
A mud that () is 120% at top layer, saline land laying moisture content (records its N content and is about 550mg/kg, P content is about 450mg/kg), soil in the topsoil 25cm degree of depth of saline land and mud are carried out mixing (mass percent of mud and topsoil is 18%) by stirring subsequently, forming osmotic coefficient is 9.0 × 10
-5the mixed zone of cm/s, namely improves district;
B () encloses ridge with mud around mixed zone, irrigate fresh water, the maintenance depth of water is 12cm, continues March;
C (), at described mixed zone place rice cultivation, not cutting off the water supply in earth's surface, mixed zone to need the water phase to ensure at paddy growth, and the depth of water is 18cm, and according to paddy growth feature and need to carry out row irrigation.
Comparative example 1
This comparative example provides a kind of method utilizing mud improvement saline land topsoil to carry out desalination, basically identical in its step and embodiment 1, the mass percent unlike the mud laid and topsoil is 30%, makes its osmotic coefficient too small, desalinization of soil by flooding or leaching weak effect, paddy rice growing way is withered weak.
Above-described embodiment is only for illustrating technical conceive of the present invention and feature; its object is to person skilled in the art can be understood content of the present invention and implement according to this; can not limit the scope of the invention with this; all equivalences done according to Spirit Essence of the present invention change or modify, and all should be encompassed within protection scope of the present invention.
Claims (10)
1. utilize mud improvement saline land topsoil to carry out a method for desalination, it is characterized in that, it comprises the following steps of carrying out successively:
A saline land topsoil mixes with mud by (), form mixed zone;
B () encloses ridge around described mixed zone, irrigate fresh water, the maintenance depth of water is 10 ~ 15cm, continues more than 2 months, oozes the desalinization of soil by flooding or leaching under carrying out fresh water;
C () be rice cultivation in described mixed zone, and according to paddy growth feature and need to carry out row irrigation.
2. utilize mud improvement saline land topsoil to carry out the method for desalination according to claim 1, it is characterized in that: in described step (a), lay mud on top layer, saline land, by machinery or artificial stirring, mud and saline land topsoil are mixed subsequently.
3. utilize mud improvement saline land topsoil to carry out the method for desalination according to claim 1, it is characterized in that: in described step (a), the topsoil in the top layer 40cm of described saline land is mixed with mud.
4. utilize mud improvement saline land topsoil to carry out the method for desalination according to claim 1, it is characterized in that: the mud that described mud is river, lake dredging up produces.
5. utilize mud improvement saline land topsoil to carry out the method for desalination according to claim 4, it is characterized in that: the moisture content of described mud is 100 ~ 150%, and N content is 500mg/kg ~ 600mg/kg, P content is 400mg/kg ~ 500mg/kg.
6. according to claim 1 or 4 or 5, utilize mud improvement saline land topsoil to carry out the method for desalination, it is characterized in that: the mass percent of described mud and described saline land topsoil is 15% ~ 20%.
7. utilize mud improvement saline land topsoil to carry out the method for desalination according to claim 1, it is characterized in that: in step (b), the maintenance depth of water is 10 ~ 15cm, continues 2 ~ 4 months.
8. utilize mud improvement saline land topsoil to carry out the method for desalination according to claim 1, it is characterized in that: in step (b), adopt mud to enclose ridge.
9. according to claim 1 or 2, utilize mud improvement saline land topsoil to carry out the method for desalination, it is characterized in that: in step (c), described mixed zone surface-water depth is 15 ~ 20cm to need the water phase to ensure at paddy growth.
10. utilize mud improvement saline land topsoil to carry out the method for desalination according to claim 1, it is characterized in that: the topsoil osmotic coefficient after described method improvement is 5.0 × 10
-5~ 1.0 × 10
-6cm/s.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510409902.5A CN105052290A (en) | 2015-07-13 | 2015-07-13 | Desalination method by using sludge to improve topsoil of saline and alkaline land |
| PCT/CN2016/070028 WO2017008473A1 (en) | 2015-07-13 | 2016-01-04 | Desalination method by using sludge to improve topsoil of saline and alkaline land |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510409902.5A CN105052290A (en) | 2015-07-13 | 2015-07-13 | Desalination method by using sludge to improve topsoil of saline and alkaline land |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105052290A true CN105052290A (en) | 2015-11-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510409902.5A Pending CN105052290A (en) | 2015-07-13 | 2015-07-13 | Desalination method by using sludge to improve topsoil of saline and alkaline land |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN105052290A (en) |
| WO (1) | WO2017008473A1 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017008473A1 (en) * | 2015-07-13 | 2017-01-19 | 河海大学 | Desalination method by using sludge to improve topsoil of saline and alkaline land |
| CN107853093A (en) * | 2017-11-29 | 2018-03-30 | 河海大学 | A kind of biological modification agent on beach saline-alkali ground and its preparation method and application |
| CN107996056A (en) * | 2017-11-13 | 2018-05-08 | 潍坊友容实业有限公司 | A kind of formula administering method of gathering materials on the spot in Yellow River irrigation salt-soda soil |
| CN109821866A (en) * | 2019-01-16 | 2019-05-31 | 安徽工程大学 | Repair structure and its restorative procedure in salt-soda soil based on river bottom mud resource utilization |
| CN115428635A (en) * | 2022-09-22 | 2022-12-06 | 武汉华天园林集团有限公司 | Fertilizing method for improving survival rate of green plants in saline-alkali area |
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| CN107853093A (en) * | 2017-11-29 | 2018-03-30 | 河海大学 | A kind of biological modification agent on beach saline-alkali ground and its preparation method and application |
| CN109821866A (en) * | 2019-01-16 | 2019-05-31 | 安徽工程大学 | Repair structure and its restorative procedure in salt-soda soil based on river bottom mud resource utilization |
| CN115428635A (en) * | 2022-09-22 | 2022-12-06 | 武汉华天园林集团有限公司 | Fertilizing method for improving survival rate of green plants in saline-alkali area |
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|---|---|
| WO2017008473A1 (en) | 2017-01-19 |
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