Quantitative analysis method of inorganic carbon sink in oasis soil in arid region

Abstract

The present application relates to a kind of quantitative analysis methods of arid zone oasis soil inorganic carbon sink, the soil sample of each target area of several time points is treated to remove the organic matter in soil sample, and the inorganic soil sample of removing organic matter is obtained;And the carbon dioxide gas discharge of several time points each target area is collected, to consider the case that soil is in absorbing carbon dioxide while releasing carbon dioxide;According to the inorganic soil sample of each target area of the first target time point and the second target time point corresponding to the first target time point and the second target time point, and the carbon dioxide gas discharge of each target area, determine the change of soil carbon storage of the arid zone oasis detection area between the first target time point and the second target time point.Due to the present application, when quantitative analysis of arid zone oasis soil inorganic carbon sink is carried out, the carbon dioxide released by soil and the influence factor that soil contains a large amount of organic carbon are removed, so that the quantitative analysis result is more accurate.

Description

Technical Field

[0001] This invention relates to the field of soil inorganic carbon sequestration technology, and in particular to a quantitative analysis method for inorganic carbon sequestration in oasis soils in arid regions. Background Technology

[0002] Carbon sequestration refers to the process, activity, or mechanism by which plants absorb carbon dioxide from the atmosphere through photosynthesis and fix it in vegetation and soil, thereby reducing the concentration of greenhouse gases in the atmosphere, through measures such as afforestation, forest management, and vegetation restoration. However, because soil contains microorganisms and some soils are saturated with carbon dioxide, soil releases carbon dioxide while absorbing it.

[0003] In existing technologies, quantitative analysis methods for inorganic carbon sequestration in oasis soils in arid regions do not remove the influencing factors such as carbon dioxide released from the soil and the large amount of organic carbon contained in the soil. Therefore, when conducting analysis, it is easy to lead to inaccurate data and affect the results of quantitative analysis. Summary of the Invention

[0004] The purpose of this invention is to provide a highly accurate quantitative analysis method for inorganic carbon sinks in oasis soils in arid regions.

[0005] To achieve the above objectives, the present invention provides the following solution:

[0006] A quantitative analysis method for inorganic carbon sequestration in oasis soils in arid regions includes:

[0007] Step 1: Collect soil samples from various target areas at several time points. Each target area is divided into land types by the arid oasis detection area. Each target area corresponds one-to-one with a land type.

[0008] Step 2: Process each of the soil samples to remove organic matter from each soil sample, and obtain soil samples with organic matter removed;

[0009] Step 3: Collect the carbon dioxide emissions from the target area at the specified time points;

[0010] Step 4: Based on the organic matter-free soil samples from each target area corresponding to the first and second target time points and the carbon dioxide emissions from each target area, determine the change in soil carbon storage in the arid oasis monitoring area between the first and second target time points; the first and second target time points are points among the plurality of time points.

[0011] Optionally, step 2 specifically includes:

[0012] Soil samples from each of the target areas were dried using a drying device to obtain dried soil samples from each of the target areas;

[0013] The dried soil sample was sterilized using a sterilization device to obtain a treated soil sample;

[0014] Based on the processed soil sample, the soil carbon density was determined to obtain the soil sample free of organic matter.

[0015] Optionally, the sample processing includes the following steps:

[0016] Dry the soil sample;

[0017] The dried soil sample was mixed with hydrogen peroxide to obtain material A;

[0018] Material B is obtained by heating the material in a water bath;

[0019] After cooling material B, the supernatant is removed, the material is dried, and ground to obtain a processed soil sample. Optionally, the change in soil carbon storage in the arid oasis monitoring area is calculated according to the following formula:

[0020] PR=∑∑PA*ΔSOC-SF

[0021] Wherein, PR is soil carbon storage, PA is the area of ​​the target region, SF is the carbon dioxide emission of the target region; ΔSOC=(SOC3-SOC1) / SJ, ΔSOC is the annual change in soil inorganic carbon density, SOC1 is the soil carbon density of the 30 cm soil layer at the first target time point, SOC3 is the soil carbon density of the 30 cm soil layer at the second target time point, and SJ is the interval between the first target time point and the second target time point.

[0022] Optionally, the interval between the first target time point and the second target time point is three years.

[0023] Optionally, prior to step 1, the following steps are also included:

[0024] The number of soil samples to be collected in the target area is determined based on the ratio of the area of ​​the target area to the area of ​​the detection area.

[0025] Optionally, after step 4, the method further includes converting the soil carbon storage of the target area into a visual image; the visual image includes a bar chart, a column chart, and a coordinate system chart.

[0026] Optionally, the land types include grassland, farmland, planted forest, and dry land.

[0027] Optionally, the drying equipment includes a soil drying chamber.

[0028] Optionally, the mixing time is 1-3 hours and the stirring speed is 300 r / min; the water bath temperature is 70-80℃ and the water bath time is 30-50 minutes.

[0029] According to specific embodiments of the present invention, the following technical effects are disclosed: This application provides a method for quantitative analysis of inorganic carbon sequestration in oasis soils in arid regions. Soil samples collected at several time points from various target areas are processed to remove organic matter, ensuring that the quantitative analysis of inorganic carbon sequestration is unaffected by organic matter in the soil samples. Then, the carbon dioxide emissions from each target area are collected at several time points to account for the simultaneous absorption and release of carbon dioxide by the soil. Finally, based on the organic matter-free soil samples from each target area corresponding to a first and second target time point, and the carbon dioxide emissions from each target area, the change in soil carbon storage in the arid oasis detection area between the first and second target time points is determined. Because this application removes the influencing factors of carbon dioxide released from the soil and the large amount of organic carbon in the soil during the quantitative analysis of inorganic carbon sequestration, the quantitative analysis results are more accurate. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is the quantitative analysis procedure for inorganic carbon sinks in arid oasis soils for this application. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] The purpose of this invention is to provide a quantitative analysis method for inorganic carbon sinks in oasis soils in arid regions.

[0034] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] This application provides a quantitative analysis method for inorganic carbon sequestration in oasis soils in arid regions, comprising the following steps:

[0036] Step 1: Collect soil samples from various target areas at several time points. Each target area is divided into land types according to the arid oasis detection area. Each target area corresponds one-to-one with a land type.

[0037] Step 2: Process each of the soil samples to remove organic matter from each soil sample, and obtain soil samples with organic matter removed.

[0038] Step 3: Collect the carbon dioxide emissions of the target area at the specified time points.

[0039] Step 4: Based on the organic matter-free soil samples from each target area corresponding to the first and second target time points and the carbon dioxide emissions from each target area, determine the change in soil carbon storage in the arid oasis monitoring area between the first and second target time points; the first and second target time points are points among the plurality of time points.

[0040] The land types mentioned include grassland, farmland, planted forest, and dry land.

[0041] In some embodiments, prior to step 1, the following may also be included:

[0042] The number of soil samples to be collected in the target area is determined based on the ratio of the area of ​​the target area to the area of ​​the detection area.

[0043] Specifically, the number of soil samples collected is determined based on the proportion of grassland, farmland, plantation forest, and dryland in the tested area. The number of soil samples is calculated by rounding Ni to the nearest integer, and Ni is rounded to 3 when the calculated result of Ni is less than 3; where Ni is the number of quadrats for land type i, Ai is the land area of ​​land type i, and each soil sample collected weighs more than 3 kg.

[0044] In some embodiments, step 2 may include:

[0045] Soil samples from each of the target areas were dried using a drying device to obtain dried soil samples from each of the target areas.

[0046] The dried soil sample was sterilized using a sterilization device to obtain a treated soil sample.

[0047] Based on the processed soil sample, the soil carbon density was determined to obtain the soil sample free of organic matter.

[0048] Specifically, soil samples collected from each target area can be placed in a soil drying oven for drying to obtain dried soil samples. Then, hydrogen peroxide is added to the dried soil samples for sterilization to remove microorganisms from the soil. The mixing time is 1-3 hours, and the stirring speed is 300 rpm, resulting in material A. Material A is then heated in a water bath at 70-80℃ for 30-50 minutes to obtain material B. Finally, material B is cooled, the supernatant is removed, and it is dried at 105℃. Then, it is ground using a grinder to obtain the processed soil sample.

[0049] Among these steps, the soil carbon density is determined based on the treated soil samples, as follows:

[0050] Taking a target area of ​​100 square meters as an example, based on the proportion of the target area to the detection area, 10 soil samples are obtained. Based on the carbon content in each soil sample, the average carbon content of the 10 soil samples is calculated, and this average value is used as the soil carbon density per unit area of ​​the target area.

[0051] In some embodiments, the method for collecting carbon dioxide emissions from the target area at each of the plurality of time points may specifically include:

[0052] Soil gas was collected using the gas well method. L-shaped PVC pipes were buried in the soil sample collection areas corresponding to the target regions. The horizontal part of the pipe was the soil gas collection pipe, and the vertical part was the gas delivery pipe. The pipes were raised to the ground and connected to an automatic gas sampler at the top. After 24 hours, to avoid gas pollution, the soil gas was extracted and discharged three times before gas collection. The collected gas samples were placed in sample bags and brought back to the laboratory for analysis. The amount of carbon dioxide gas emitted from each target region during the collection time interval was calculated.

[0053] In some embodiments, the change in soil carbon storage in the arid oasis monitoring area between the first target time point and the second target time point can be determined based on the organic matter-free soil samples from each target area corresponding to the first target time point and the second target time point, as well as the carbon dioxide gas emission from each target area. Here, a three-year interval between the first target time point and the second target time point is taken as an example.

[0054] Specifically, based on soil samples collected from the same target area between the first and second target time points, the annual change in soil inorganic carbon density in the target area is calculated using the following formula:

[0055] ΔSOC=(SOC3-SOC1) / SJ

[0056] Wherein, SOC1 is the soil carbon density of the 30 cm soil layer at the first target time point, SOC3 is the soil carbon density of the 30 cm soil layer at the second target time point, and SJ is the interval between the first target time point and the second target time point, that is, the interval is three years.

[0057] Based on the annual change in soil inorganic carbon density ΔSOC and the carbon dioxide emissions from soil samples in the target area during the time interval from the first target time point to the second target time point, the soil carbon storage in the target area is calculated using the following formula:

[0058] PR=∑∑PA*ΔSOC-SF

[0059] Where PA represents the soil area; SF represents the carbon dioxide emissions from the soil sample in the target area during the time interval between the first target time point and the second target time point.

[0060] In some embodiments, after obtaining the soil carbon storage of the target area, the method may further include:

[0061] The soil carbon storage in the target area is converted into a visual image.

[0062] The visualization images can include bar charts, column charts, and coordinate graphs.

[0063] In summary, this application has the following advantages: 1) It processes soil samples from target areas at several time points to remove organic matter, ensuring that the quantitative analysis of soil inorganic carbon sequestration is unaffected by organic matter. 2) It collects carbon dioxide emissions from target areas at several time points to account for the simultaneous absorption and release of carbon dioxide by the soil, reducing the impact of soil release on the estimated values ​​and improving the accuracy of the values. 3) Based on the organic matter-removed soil samples from target areas corresponding to the first and second target time points, and the carbon dioxide emissions from each target area, it determines the change in soil carbon storage in the arid oasis monitoring area between the first and second target time points. Based on the change in soil carbon storage in the target monitoring area, a visualization map of carbon sequestration in arid oasis soil at the overall planning level is obtained. This map is applicable to planners in arid oasis soils for rapid estimation of carbon sequestration and spatial visualization of carbon sequestration, thus providing guidance for adjusting arid oasis soil planning schemes.

[0064] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0065] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. Furthermore, those skilled in the art will recognize that, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A quantitative analysis method for inorganic carbon sequestration in oasis soils in arid regions, characterized in that, include: Step 1: Collect soil samples from various target areas at several time points. Each target area is divided into land types by the arid oasis detection area. Each target area corresponds one-to-one with a land type. Step 2: Process each of the soil samples to remove organic matter from each soil sample, and obtain soil samples with organic matter removed; Step 3: Collect the carbon dioxide emissions from the target area at the specified time points; Step 4: Based on the organic matter-free soil samples from each target area corresponding to the first and second target time points and the carbon dioxide emissions from each target area, determine the change in soil carbon storage in the arid oasis monitoring area between the first and second target time points; the first and second target time points are points among the plurality of time points.

2. The method for quantitative analysis of inorganic carbon sequestration in oasis soils in arid areas according to claim 1, characterized in that, Step 2 specifically includes: Soil samples from each of the target areas were dried using a drying device to obtain dried soil samples from each of the target areas; The dried soil sample was sterilized using a sterilization device to obtain a treated soil sample; Based on the processed soil sample, the soil carbon density was determined to obtain the soil sample free of organic matter.

3. The quantitative analysis method for inorganic carbon sequestration in oasis soils in arid areas according to claim 1, characterized in that, The sample processing includes the following steps: Dry the soil sample; The dried soil sample was mixed with hydrogen peroxide to obtain material A; Material A is heated in a water bath to obtain material B; After cooling material B, the supernatant was removed, the material was dried, and then ground to obtain the treated soil sample.

4. The method for quantitative analysis of inorganic carbon sequestration in oasis soils in arid areas according to claim 1, characterized in that, The changes in soil carbon storage in the arid oasis monitoring area were calculated using the following formula: PR=∑∑PA SOC-SF Wherein, PR is soil carbon storage, PA is the area of ​​the target region, and SF is the carbon dioxide emission of the target region; SOC=(SOC3-SOC1) / SJ, SOC represents the annual change in soil inorganic carbon density, SOC1 represents the soil carbon density in the 30 cm soil layer at the first target time point, SOC3 represents the soil carbon density in the 30 cm soil layer at the second target time point, and SJ represents the time interval between the first and second target time points.

5. The method for quantitative analysis of inorganic carbon sequestration in oasis soils in arid areas according to claim 1, characterized in that, The interval between the first target time point and the second target time point is three years.

6. The method for quantitative analysis of inorganic carbon sequestration in oasis soils in arid areas according to claim 1, characterized in that, Before step 1, the following is also included: The number of soil samples to be collected in the target area is determined based on the proportion of the target area to the area of ​​the oasis testing area in the arid region.

7. The method for quantitative analysis of inorganic carbon sequestration in oasis soils in arid areas according to claim 1, characterized in that, Following step 4, the process further includes converting the soil carbon storage of the target area into a visual image; the visual image includes a bar chart, a column chart, and a coordinate system chart.

8. The method for quantitative analysis of inorganic carbon sequestration in oasis soils in arid areas according to claim 1, characterized in that, The land types include grassland, farmland, planted forest, and dry land.

9. The method for quantitative analysis of inorganic carbon sequestration in oasis soils in arid areas according to claim 2, characterized in that, The drying equipment includes a soil drying box.

10. The method for quantitative analysis of inorganic carbon sequestration in oasis soils in arid areas according to claim 3, characterized in that, The mixing time is 1-3 hours, and the stirring speed is 300 r / min; the water bath temperature is 70-80℃, and the water bath time is 30-50 minutes.

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