CN115299205A - Carbon sequestration and sink increasing and carbon conditioning method for saline marsh soil - Google Patents
Carbon sequestration and sink increasing and carbon conditioning method for saline marsh soil Download PDFInfo
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- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 142
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- 239000002689 soil Substances 0.000 title claims abstract description 136
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 title claims abstract description 59
- 239000011780 sodium chloride Substances 0.000 title claims abstract description 59
- 230000009919 sequestration Effects 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 52
- 230000003750 conditioning effect Effects 0.000 title claims abstract description 24
- 241000196324 Embryophyta Species 0.000 claims abstract description 39
- 239000011232 storage material Substances 0.000 claims abstract description 26
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000004202 carbamide Substances 0.000 claims abstract description 12
- 229910000403 monosodium phosphate Inorganic materials 0.000 claims abstract description 12
- 235000019799 monosodium phosphate Nutrition 0.000 claims abstract description 12
- AJPJDKMHJJGVTQ-UHFFFAOYSA-M sodium dihydrogen phosphate Chemical compound [Na+].OP(O)([O-])=O AJPJDKMHJJGVTQ-UHFFFAOYSA-M 0.000 claims abstract description 12
- 239000000203 mixture Substances 0.000 claims abstract description 9
- 241001149258 Sporobolus alterniflorus Species 0.000 claims description 25
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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
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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
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K17/00—Soil-conditioning materials or soil-stabilising materials
- C09K17/40—Soil-conditioning materials or soil-stabilising materials containing mixtures of inorganic and organic compounds
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Abstract
The invention discloses a carbon sequestration, sink increasing and carbon conditioning method for saline soil, which comprises the steps of preparing a soil storage agent and adding the soil storage agent into the saline soil needing carbon sequestration and sink increasing; the soil storage agent mainly comprises urea, sodium dihydrogen phosphate and saline marsh plant residues. In the process, the physicochemical property of the soil is changed, and the carbon fixation amount of the saline marsh plants is increased, so that the carbon fixation amount of the whole coastal wetland is increased. On the basis, the community structure of the microorganisms in the salt marsh is changed by utilizing the response of the plant root system microorganism environment in the salt marsh to the addition of the storage regulator. Meanwhile, the carbon structure and composition of the saline marsh soil are conditioned, and the content of inert carbon is increased, so that the carbon fixation effect is improved and maintained. The method can increase the carbon storage capacity of the coastal wetland soil, greatly enhance the carbon storage function of the wetland and has obvious effect.
Description
Technical Field
The invention discloses a carbon sequestration, sink increase and carbon conditioning method for saline marsh soil, and belongs to the technical field of ecological environment improvement.
Background
Greenhouse effect and global warming are currently important environmental issues internationally, and a large cause of these environmental problems is a drastic increase in carbon emissions due to human activities. Under the background of 'double carbon', how to expand the carbon fixing capacity of an ecosystem, increase carbon sink and reduce carbon source is a fundamental way to solve the problem. As China enters a new period, the economic society is continuously developed, and the ecosystem is damaged in different degrees. The soil carbon reservoir of the coastal wetland is one of important carbon reservoirs, and the carbon reserve of the mangrove wetland can reach 43.49-79.14 t/hm 2 The carbon storage capacity of the spartina alterniflora wetland can reach 25.50t/hm 2 And has a considerable lifting space. The carbon sequestration and sink increase technology of the salt marsh is a new hot spot direction, and how to utilize vast coastal wetlands to make the coastal wetlands become important carbon sinks has very important significance for reducing negative ecological effects brought by carbon dioxide emission.
The soil carbon reservoir is most concerned with the soil organic carbon reservoir because the carbon reservoir content in the soil is large and the change is obvious. The soil organic carbon library consists of active organic carbon and inert organic carbon. The active organic carbon is easy to be utilized and decomposed by microorganisms, is a part of soil carbon bank with great change, and is also an important carbon source. Under the current background, how to condition the soil organic carbon library changes the components and the structure of the soil organic carbon, increases the content of inert organic carbon, and has no significance for stabilizing the soil carbon library. The chemical structure of organic carbon is basically divided into four functional regions, namely an alkyl carbon region, an alkoxy carbon region, an aromatic carbon region and a carboxyl carbon region. Wherein the alkyloxy carbon is a readily decomposable organic carbon structural component and the alkyl carbon is a relatively difficultly decomposable organic carbon structural component. Therefore, the important link of carbon sequestration and sink increase of the salt marsh is to increase the proportion of alkyl carbon and reduce the proportion of alkyl oxygen carbon so that the organic carbon of the soil is more stable.
At present, the carbon sequestration and sink increase technology for the standardized saline marsh soil is not reported.
Disclosure of Invention
The purpose of the invention is as follows: aiming at the technical problems, the invention provides a carbon sequestration and sequestration increasing and carbon conditioning method for mutual salt marsh soil, and aims to condition the physicochemical property of soil by adding a soil storage agent, indirectly change the components and the structure of organic carbon in the soil through the action of salt marsh plants and salt marsh microorganisms, and improve the carbon reserve of a coastal carbon reservoir. The method solves the problems that the existing carbon sequestration and sink increase technology for saline marsh soil is deficient and the carbon sequestration potential is not sufficiently exerted, and has the advantages of high efficiency, high speed, low cost and obvious effect. The method provides a terminal technical scheme for realizing carbon peak reaching and carbon neutralization.
The technical scheme is as follows: the invention provides a carbon sequestration, sequestration and carbon conditioning method for saline soil, which comprises the steps of preparing a soil storage agent and adding the soil storage agent into the saline soil needing carbon sequestration and sequestration; the soil storage regulator comprises the main components of urea, sodium dihydrogen phosphate and saline plant residues. In the process, the carbon fixing amount of the saline marsh plants can be increased, so that the carbon fixing amount of the whole coastal wetland is increased. On the basis, the community structure of the microorganisms in the salt marsh is changed by utilizing the response of the plant root system microorganism environment in the salt marsh to the addition of the storage regulator. Meanwhile, the carbon structure and composition of the saline marsh soil are conditioned, and the content of inert carbon is increased, so that the carbon fixation effect is improved and maintained.
As preferred or specific embodiments:
among the soil storage agents, urea (CN) 2 H 4 O), sodium dihydrogen phosphate (NaH) 2 PO 4 ·2H 2 O) and the mass ratio of the saline marsh plant residues is (0.1-1.5) to (0.1-1.0) to (18-22).
The preparation method of the soil storage agent comprises the following steps: mixing 0.1-1.5g of urea, 0.1-1.0g of sodium dihydrogen phosphate and 18-22g of saline marsh plant residues, uniformly mixing to prepare 1L of mother liquor, sealing and standing at normal temperature, and diluting according to a proportion when in use; the dilution factor is preferably 10 to 100 times.
The saline soil is vegetation covered saline soil or non-vegetation covered saline soil.
Further, the vegetation covers the saline marsh area, and is the spartina alterniflora saline marsh which grows for 4-12 years, or the spartina alterniflora and the suaeda salsa are alternatively saline marsh.
The saline marsh plant residue is residue of Spartina alterniflora (Spartina alterniflora), suaeda salsa (Suaeda salsa) or Phragmites australis (Phragmitis).
Preferably, the saline marsh plant residue is a mixture of stems and leaves of spartina alterniflora in a ratio of 1.
The adding method comprises the following steps: the fertilizer is added by two modes of foliage spraying and land infiltration. Specifically, the soil storage agent is slowly poured into the soil according to a five-point method. Preferably, the land infiltration mode is performed by using a funnel-shaped tool with an upper opening diameter of 10cm and a lower opening diameter of 1 cm. When in use, the fertilizer is inserted into soil, and then the storage agent is slowly poured from the upper opening to slowly permeate into the soil.
The time of the addition is from month 4 to month 11.
The method also comprises that 10-20 implementation areas with the size of 1m multiplied by 1m are arranged in parallel along the coastline direction, and the interval of each implementation area is more than 1 m; then, 20 to 40 execution areas of 1m × 1m are arranged in the direction perpendicular to the coastline, and each execution area is spaced at 0.5m intervals.
Furthermore, in each embodiment area, the leaf surface dosage is 0.4-0.6L and the soil dosage is 1.8-2.2L.
The invention relates to a carbon sequestration and sequestration increasing and carbon conditioning technology for saline marsh soil, which is characterized in that the growth environment of saline marsh plants and microorganisms is conditioned by adding a storage agent, the components and the structure of organic carbon in soil are indirectly changed, and more particularly, the carbon sequestration efficiency and the carbon sequestration amount of spartina alterniflora are improved by utilizing the following steps.
Firstly, preparing a storage regulator. 0.7524g of urea, 0.2792g of sodium dihydrogen phosphate and 20g of plant residues are mixed and evenly mixed to prepare 1L of mother liquor, and the mother liquor is sealed and kept stand for 72 hours at normal temperature. Preferably, it is diluted 10 to 100 times before use. The saline marsh plant residue is a mixture of stems and leaves of spartina alterniflora in a ratio of 1.
And secondly, selecting a proper area with covered plants from the coastal wetland as a carbon sequestration and sequestration area. 10-20 implementation areas of 1m multiplied by 1m are arranged in parallel along the sea direction, and the interval of each implementation area is more than 1m. Then, along the direction perpendicular to the coastline, 20 to 40 execution areas were disposed, each at an interval of 0.5m.
And step three, adding a soil storage agent. And in each implementation area, uniformly spraying the storage regulating agent in the first step on the leaf surfaces of the saline marsh plants by using a small spraying pot. Then slowly pouring the soil storage agent into the implementation area according to a five-point method, wherein the concrete method comprises the following steps: the method is carried out by using a funnel-shaped tool with an upper opening diameter of 10cm and a lower opening diameter of 1 cm. When in use, the fertilizer is inserted into soil, and then the storage agent is slowly poured into the soil from the upper opening so as to slowly permeate into the soil. The amount of the added leaves is 0.5L and the soil is 2L in each area. As a supplementary method, the soil storage agent can also be loosened by a shovel according to a five-point method, and after the pit is dug, the soil storage agent is poured into the pit and covered with a layer of surface soil.
And step four, starting from month 4, adding the storage regulating agent every month, wherein the adding is carried out according to the method in the step three, and the step is carried out to month 11.
And fifthly, sampling in summer and winter respectively, performing high-throughput sequencing to know the change of the salina microbial community structure, simultaneously determining the contents of inert carbon and active carbon in the soil, and determining the structure of organic carbon in the soil, thereby calculating the carbon fixation effect.
The invention provides a carbon sequestration, sink increase and carbon conditioning method for salt marsh soil. At the moment, after the salt marsh plants absorb available nitrogen and phosphorus, the nutrient conditions of the salt marsh plants are changed, the salt marsh plants grow more vigorously, the carbon fixation efficiency of the salt marsh plants can be improved, and the organic carbon content of soil is increased. Meanwhile, the storage regulator contains a carbon source, and after the storage regulator is added into soil, the carbon source can be provided for soil microorganisms, so that the activity of the soil microorganisms is enhanced. And after nitrogen and phosphorus in the regulator are added, the abundance of some functional flora in the soil is improved, such as aerobic non-oxygen-producing photosynthetic bacteria, which can increase the carbon source of microorganisms. And the activity of the dominant flora related to carbon metabolism is reduced, so that the decomposition rate of soil carbon is reduced, and the self-holding of a carbon reservoir is facilitated, thereby achieving the effects of carbon sequestration and sink increase.
The carbon sequestration and sequestration increasing and carbon conditioning technology for the saline marsh soil can be used in the saline marsh soil, mainly aims at a saline marsh area covered by vegetation, and certainly can also achieve a certain effect in a saline marsh area without vegetation cover. Therefore, the technology has wide application range and can be popularized and applied in a large scale.
The carbon sequestration and sequestration increasing and carbon conditioning technology for the saline marsh soil provided by the invention has the advantages of simple preparation of the soil storage agent, easily obtained raw materials and low price. The method has the advantages that the saline marsh plant residues are adopted as carbon source supplement, the method is environment-friendly, after the storage regulating agent is added, the growth of the saline marsh plants can be promoted, the soil microbial community structure is changed, and the plant carbon sequestration and soil carbon sequestration effects can be greatly improved.
By the carbon sequestration and carbon conditioning technology for the saline soil, the fixed amount of organic carbon in the saline soil is greatly improved, the content of inert organic carbon in the soil can reach 26.54mg/g from the original 1.51mg/g, the proportion of alkyl carbon in the soil is improved to 23.61% from the original 16.06%, and the proportion of alkoxy carbon is reduced to 36.14% from the original 45.49%. Summer field tests show that the increase of the organic carbon content of the soil to the final stage of the test can reach 188.6 percent by conditioning the saline marsh soil.
The technical effects are as follows: compared with the prior art, the invention provides a novel carbon sequestration and sink enhancement technology for the saline-methane soil, which is environment-friendly, easily available in material cost and capable of utilizing waste. By implementing the technology, the organic carbon structure of the salt marsh soil can be greatly changed, the carbon reservoir retention time is prolonged, the carbon content of the soil is increased, and the effect is obvious.
1. The invention reasonably and fully utilizes the plant residues of the spartina alterniflora and the medicament in a combined manner, saves the cost of an external carbon source, and reduces the discomfort of halochy microorganisms to a strange carbon source. The technical problem of carbon sequestration and sink increase is solved in an environment-friendly manner;
2. the soil carbon sequestration and sink increasing method provided by the invention has a wide application range, and can be widely applied to carbon sequestration of saline soil;
3. the adding mode of the soil regulator provided by the invention can improve the utilization efficiency of the saline land plants on the useful components in the regulator, and meanwhile, the regulator can be effectively and uniformly applied to the saline land soil, so that the treatment efficiency of the regulator is improved.
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FIG. 1 is a schematic diagram of the design of the implementation area of the present invention.
Detailed Description
The present invention will be further described with reference to the following examples.
In the following examples, the method for measuring the content of inert carbon and active carbon in soil is as follows:
weighing 5.0g of dried soil sample, placing the dried soil sample in a centrifuge tube, adding 50ml of 10% HF solution, continuously oscillating for 1h, placing the dried soil sample in a centrifuge for 10min at 3000r/min, removing supernatant, continuously oscillating with HF solution for 7 times, carrying out test treatment for 8 times, oscillating for 1h for the first 4 times, oscillating for 12h for the next 3 times, and finally oscillating for 24h for the last 1 time. The test process is mainly to remove Fe in the sample to be tested 3+ And Mn 2+ Etc. to improve the signal-to-noise ratio of the instrumental analysis. And (3) washing the sample to be detected after the HF solution treatment for 6-8 times to be neutral by using deionized water, carrying out freeze drying on the treated residue, grinding by using a mortar, and sieving by using a 100-mesh sieve to be detected. The sample to be tested was analyzed by nuclear magnetic resonance (Bruker AV 400MHz, bruker Co., ltd.) using a solid state spectrometer 13 The C-cross polarization magic angle rotation (CP MAS) technology has the pulse delay time of 0.5s and the acquisition time of 10ms.
Example 1:
(1) And (4) preparing a storage regulating agent. 0.7524g of urea, 0.2792g of sodium dihydrogen phosphate and 20g of plant residues are mixed and evenly mixed to prepare 1L of mother liquor, and the mother liquor is sealed and kept stand for 72 hours at normal temperature. It was diluted 100-fold before use. The plant residue is a mixture of stems and leaves of the spartina alterniflora in a ratio of 1.
(2) Selecting a spartina alterniflora salt marsh which develops for 4 years from the coastal wetland. 10 execution areas of 1m × 1m are provided in parallel in the coastline direction, and the interval between each execution area is 1m or more. Then, 20 execution areas of 1m × 1m were provided in the direction perpendicular to the coastline, and the interval between each execution area was 0.5m.
(3) In each implementation area, the storage regulating agent in the step (1) is uniformly sprayed on the leaf surfaces of the spartina alterniflora by a small spraying pot. Then slowly pouring the soil storage agent into the implementation area according to a five-point method. The specific method comprises the following steps: the method is carried out by using a funnel-shaped tool with an upper opening diameter of 10cm and a lower opening diameter of 1 cm. When in use, the fertilizer is inserted into soil, and then the storage agent is slowly poured into the soil from the upper opening so as to slowly permeate into the soil. The amount of the added leaves is 0.5L and the soil is 2L in each area.
(4) And (4) adding the storage regulating agent every month from 4 months, wherein the adding is carried out according to the method in the step (3) and is carried out for 11 months.
(5) And sampling in 7 months and 12 months respectively, performing high-throughput sequencing to know the change of the saline marsh gas microbial community structure, simultaneously determining the contents of inert carbon and active carbon in the soil, and determining the structure of organic carbon in the soil, thereby calculating the carbon fixation effect.
Example 2:
(1) And (4) preparing a storage regulator. 0.7524g of urea, 0.2792g of sodium dihydrogen phosphate and 20g of plant residues are mixed, mixed uniformly to prepare 1L of mother liquor, and sealed and kept stand for 72h at normal temperature. It was diluted 20-fold before use. The plant residue is a mixture of stems and leaves of the spartina alterniflora in a ratio of 1.
(2) Selecting spartina alterniflora growing for 11 years in coastal wetland. 15 execution areas of 1m × 1m are arranged in parallel in the coastline direction, and the interval between each execution area is 1m. Then, 20 execution areas of 1m × 1m were provided in the direction perpendicular to the coastline, and the interval between each execution area was 0.5m.
(3) In each implementation area, the storage regulating agent in the step (1) is uniformly sprayed on the leaf surfaces of the spartina alterniflora by a small spraying pot. Then slowly pouring the soil storage agent into the implementation area according to a five-point method, wherein the concrete method comprises the following steps: digging a soil pit by using an iron shovel, and paying attention to the fact that the saline marsh plants are not damaged as much as possible, wherein the diameter of the soil pit is about 5cm, and the depth of the soil pit is about 10cm. Then slowly pouring the soil storage agent into the soil pit, and covering a layer of soil on the soil pit by using a shovel after pouring.
(4) And (4) adding the storage regulating agent every month from 4 months, wherein the adding is carried out according to the method in the step (3) and is carried out for 11 months.
(5) And sampling at 7 months and 12 months respectively, performing high-throughput sequencing to know the change of the salina microbial community structure, simultaneously determining the contents of inert carbon and activated carbon in the soil, and determining the structure of organic carbon in the soil, thereby calculating the carbon fixation effect.
Example 3:
(1) And (4) preparing a storage regulating agent. 0.7524g of urea, 0.2792g of sodium dihydrogen phosphate and 20g of plant residues are mixed, mixed uniformly to prepare 1L of mother liquor, and sealed and kept stand for 72h at normal temperature. It was diluted 100-fold before use. The plant residue is a mixture of stems and leaves of the spartina alterniflora in a ratio of 1.
(2) Selecting a staggered area of spartina alterniflora and suaeda salsa in the coastal wetland. 20 execution areas of 1m × 1m are provided in parallel along the coastline direction, and the interval between each execution area is 1m. Then, 40 execution areas of 1m × 1m were provided in the direction perpendicular to the coastline, and the interval between each execution area was 0.5m.
(3) In each implementation area, the storage regulating agent in the step (1) is uniformly sprayed on the leaf surfaces of the spartina alterniflora by a small spraying pot. Then slowly pouring the soil conditioning agent into the implementation area according to a five-point method. The specific method comprises the following steps: the method is carried out by using a funnel-shaped tool with an upper opening diameter of 10cm and a lower opening diameter of 1 cm. When in use, the fertilizer is inserted into soil, and then the storage agent is slowly poured into the soil from the upper opening so as to slowly permeate into the soil. The amount of the added leaves is 0.5L and the soil is 2L in each area.
(4) And (4) adding the storage regulating agent every month from 4 months, wherein the adding is carried out according to the method in the step (3) and is carried out to 11 months.
(5) And sampling in 7 months and 12 months respectively, performing high-throughput sequencing to know the change of the saline marsh gas microbial community structure, simultaneously determining the contents of inert carbon and active carbon in the soil, and determining the structure of organic carbon in the soil, thereby calculating the carbon fixation effect.
Example 4:
(1) And (4) preparing a storage regulator. 0.7524g of urea, 0.2792g of sodium dihydrogen phosphate and 20g of plant residues are mixed, mixed uniformly to prepare 1L of mother liquor, and sealed and kept stand for 72h at normal temperature. It was diluted 10-fold before use. The plant residue is a mixture of stems and leaves of the spartina alterniflora in a ratio of 1.
(2) Selecting a region where the spartina alterniflora and the suaeda salsa are staggered in the coastal wetland. 20 execution areas of 1m × 1m are provided in parallel along the coastline direction at an interval of 1m. Then, 40 execution areas of 1m × 1m were provided in the direction perpendicular to the coastline, and the interval between each execution area was 0.5m.
(3) In each application area, the storage regulating agent was uniformly sprayed on the leaf surfaces of the spartina alterniflora by a small spray can. Then slowly pouring the soil conditioning agent into the implementation area according to a five-point method. The specific method comprises the following steps: the method is carried out by using a funnel-shaped tool with an upper opening diameter of 10cm and a lower opening diameter of 1 cm. When in use, the fertilizer is inserted into soil, and then the storage agent is slowly poured into the soil from the upper opening so as to slowly permeate into the soil. The amount of the added leaves is 0.5L and the soil is 2L in each area.
(4) And (4) adding the storage regulating agent every month from 7 months, wherein the adding is carried out according to the method in the step (3) and is carried out to 11 months.
(5) And sampling at 8 months and 12 months respectively, performing high-throughput sequencing to know the change of the salina microbial community structure, simultaneously determining the contents of inert carbon and activated carbon in the soil, and determining the structure of organic carbon in the soil, thereby calculating the carbon fixation effect.
It should be understood that the particular embodiments described above are illustrative only and are not limiting. All other embodiments obtained by a person skilled in the art without making any inventive step are in principle within the scope of protection of the present invention.
Carbon sequestration and sink enhancement effects obtained in Table 1 example
Claims (10)
1. A carbon sequestration and carbon conditioning method for saline soil is characterized by comprising the steps of preparing a soil storage agent and adding the soil storage agent into the saline soil needing carbon sequestration and sequestration; the soil storage agent mainly comprises urea, sodium dihydrogen phosphate and saline marsh plant residues.
2. The method for carbon sequestration, sequestration and conditioning for saline land soil according to claim 1, wherein the soil conditioner comprises urea, sodium dihydrogen phosphate and saline plant residues in a mass ratio of (0.1-1.5): (0.1-1.0): (18-22).
3. The method for carbon sequestration, sequestration and conditioning for saline marsh soil according to claim 1, wherein the soil storage agent is prepared by the following steps: mixing 0.1-1.5g of urea, 0.1-1.0g of sodium dihydrogen phosphate and 18-22g of saline marsh plant residues, preparing 1L of mother liquor after uniformly mixing, sealing and standing at normal temperature, and diluting according to a proportion when in use; the dilution factor is preferably 10 to 100 times.
4. The method for carbon sequestration, sequestration and carbon conditioning for saltmarsh soil of claim 1, wherein the saltmarsh soil is vegetation-covered saltmarsh region soil or non-vegetation-covered saltmarsh region soil.
5. The carbon sequestration, increase and conditioning method for saline land soil according to claim 4, wherein the vegetation covers the saline land area, and is the Spartina alterniflora growing for 4-12 years, or the Spartina alterniflora and the Suaeda salsa are alternately saline land.
6. The method for carbon sequestration, sequestration and conditioning for saltmarsh soil as claimed in claim 1, wherein the saltmarsh plant residue is residue of Spartina alterniflora, suaeda salsa or Phragmites australis.
7. The carbon sequestration, and conditioning method for saline marsh soil according to claim 1, wherein the saline marsh plant residue is a mixture of stems and leaves of spartina alterniflora in a ratio of 1.
8. The method for carbon sequestration, sink enhancement and carbon conditioning for saline marsh soil according to claim 1, wherein the adding method comprises: the fertilizer is added by two modes of foliage spraying and land infiltration; the time of the addition is from month 4 to month 11.
9. The method for carbon sequestration, and carbon conditioning for saltmarsh soil according to claim 1, wherein 10 to 20 implementation areas of 1m × 1m are arranged in parallel along the coastline direction, and the interval between each implementation area is 1m or more; then, 20 to 40 execution areas of 1m × 1m are arranged in the direction perpendicular to the coastline, and each execution area is spaced at 0.5m intervals.
10. The method for carbon sequestration, sequestration and conditioning for saline marsh soil as claimed in claim 9, wherein the leaf surface area per dosage is 0.4-0.6L and the soil area per dosage is 1.8-2.2L in each example area.
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