CN112782385A - Method for estimating density and reserve of soil organic carbon - Google Patents

Method for estimating density and reserve of soil organic carbon Download PDF

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CN112782385A
CN112782385A CN202011471133.9A CN202011471133A CN112782385A CN 112782385 A CN112782385 A CN 112782385A CN 202011471133 A CN202011471133 A CN 202011471133A CN 112782385 A CN112782385 A CN 112782385A
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郑光辉
焦彩霞
徐明星
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Zhejiang Institute Of Geological Survey
Nanjing University of Information Science and Technology
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Abstract

The invention discloses a method for estimating density and reserve of soil organic carbon, belonging to the technical field of soil measurement, and comprising the following steps: setting soil sampling point positions, collecting profile samples of soil bodies, and measuring the thickness of each soil layer; testing the organic carbon content of each soil layer, and the volume percentage and volume weight index of the gravel with the thickness of more than 2 mm; calculating the organic carbon density of soil in unit centimeter depth of each soil layer sample, and establishing a linear regression model of the organic carbon density of the soil in unit centimeter depth and the organic carbon content of the soil; and respectively establishing the functional relations between the organic carbon density and the organic carbon content of the soil and between the organic carbon reserve and the organic carbon content based on the established linear regression model. The method directly, quickly and accurately estimates the carbon density and carbon reserve of the soil according to the organic carbon content, and improves the acquirability of the organic carbon reserve data of the soil.

Description

Method for estimating density and reserve of soil organic carbon
Technical Field
The invention relates to the technical field of measurement soil science, in particular to a method for estimating organic carbon density and reserve of soil.
Background
Soil organic carbon is an important component of soil, is a source of plant nutrients, and plays an important role in forming soil aggregates, increasing soil water content, and reducing soil degradation and erosion. The soil is the third large carbon reservoir in the earth system, and the total organic carbon content of the global soil exceeds the total organic carbon content of the atmospheric carbon reservoir and the ecological carbon reservoir. The small change of the organic carbon in the soil can generate large influence on the carbon dioxide in the atmosphere, so that the climate change is influenced, and the rapid and accurate estimation of the soil organic carbon reserve is a precondition and a basis for realizing the analysis of the space-time change thereof and further evaluating the climate change.
Soil carbon density is an extremely important index for evaluating and measuring organic carbon reserves in soil. The soil organic carbon density refers to the reserve of soil organic carbon in a soil layer with a certain depth per unit area. If a section of a certain soil body consists of m layers, the organic carbon density SOCD (t/hm) of the section2) The calculation formula of (2) is as follows:
Figure BDA0002833958880000011
in the formula SOCiThe organic carbon content (g/kg) of the soil of the i-th layer, BDiThe i-th layer is soil volume weight (g/cm)3)，HiThickness of soil layer of i-th layer, GiIs the volume percentage (%) of the ith layer of gravel larger than 2 mm. The calculation formula of the soil organic carbon density is not complicated, but the volume weight and the gravel content data are difficult to obtain (sometimes even cannot be measured), so that the calculation of the soil carbon storage is very inconvenient.
Disclosure of Invention
The invention aims to provide a soil organic carbon density and reserve estimation method to solve the problems that volume weight and gravel content data are difficult to obtain and the volume weight and gravel content data are excessively dependent in the current soil organic carbon density and carbon reserve calculation process.
The technical scheme is as follows: in order to achieve the purpose of the invention, the technical scheme adopted by the invention is that the method for estimating the density and reserve of the organic carbon in the soil comprises the following steps:
step A: setting soil sampling point positions, collecting profile samples of soil bodies, and measuring the thickness of each soil layer; testing the organic carbon content of each soil layer, and the volume percentage and volume weight index of the gravel with the thickness of more than 2 mm;
and B: calculating the organic carbon density of soil in unit centimeter depth of each soil layer sample, and establishing a linear regression model of the organic carbon density of the soil in unit centimeter depth and the organic carbon content of the soil;
and C: and B, respectively establishing the functional relations between the organic carbon density and the organic carbon content of the soil and between the organic carbon reserve and the organic carbon content based on the linear regression model established in the step B.
Further, the density of the organic carbon in the soil with the unit centimeter depth in the step B is the reserve of the organic carbon in the soil with the unit area of 1cm thickness, and the expression is as follows: SOCDpcmSOC is the organic carbon content of soil, BD is the soil bulk weight, H is the soil thickness, and G is the volume percentage of gravel larger than 2 mm; establishing a linear regression model of the soil organic carbon density and the soil organic carbon content in unit centimeter depth, wherein the expression is as follows:
SOCDpcmin the formula, a and b are both calibration coefficients.
Further, the modeling precision of the linear regression model in the step B is determined by a coefficient R2And the root mean square error RMSE, where R2The larger the RMSE, the smaller the RMSE, the higher the modeling accuracy.
Further, organic carbon density SOCD of soil layer i in step CiExpressed as a function of the organic carbon content of the soil, the expression is: SOCDi＝Hi×(a×SOCi+ b) wherein HiThe thickness of the ith layer; the section of a certain soil body consists of m soil layers, the organic carbon density SOCD of the section is expressed as a function relation of the organic carbon content of the soil, and the expression is as follows:
Figure BDA0002833958880000021
the soil organic carbon storage SOCS is expressed as a function of soil organic carbon content, and the expression is as follows:
Figure BDA0002833958880000022
wherein S is the area of the study region.
Has the advantages that: compared with the prior art, the technical scheme of the invention has the following beneficial technical effects:
the method for estimating the soil organic carbon density and the soil reserve provided by the invention avoids the problem of excessive dependence on soil volume weight and gravel content data, and shortens the detection time. The method provided by the invention has the advantages of high precision, good stability, certain universality and suitability for popularization.
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FIG. 1 is a method flow diagram of the present invention as a whole;
fig. 2 is a scatter plot of organic carbon density versus organic carbon content per centimeter of depth of soil for example 1 of the present invention (n-692);
fig. 3 is a scatter plot of organic carbon density and organic carbon content per centimeter depth of soil in example 2 of the present invention (n 110).
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "comprises" and "comprising," and any variations thereof, in the description and claims of the present invention and the above-described drawings, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In this embodiment, a method for estimating soil organic carbon density and reserve is provided, and fig. 1 is a flow chart of a method for estimating soil organic carbon density and reserve according to an embodiment of the present invention, where the flow chart includes the following steps:
step A: setting soil sampling point positions aiming at a research area, collecting profile samples of soil bodies in the field, and measuring the thickness of each soil layer; the laboratory tests the organic carbon content of each soil layer, and the volume percentage and volume weight index of the gravel with the thickness of more than 2 mm. The soil sample collection and index acquisition are implemented strictly according to the requirements of the manual of field soil description and sampling and the analysis method of the soil survey laboratory.
And B: soil organic carbon density per centimeter depth (SOCD)pcm，t/hm2) The organic carbon reserve of the soil with the unit area of 1cm thickness is expressed as a formula I: SOCDpcmSOC is the organic carbon content of the soil (G/kg), BD is the soil bulk density (G/cm)3) H is the thickness of the soil layer of 1cm, and G is the volume percentage (%) occupied by the gravel larger than 2 mm. Calculating the organic carbon density of soil in unit centimeter depth of each soil layer sample, and establishing a linear regression model of the organic carbon density of the soil in unit centimeter depth and the organic carbon content of the soil, wherein the expression is as follows:
SOCDpcmin the formula, a and b are both calibration coefficients.
And C: and B, respectively establishing a functional relation between the Soil Organic Carbon Density (SOCD) and the organic carbon content and a functional relation between the organic carbon storage capacity (SOCS) and the organic carbon content on the basis of the linear regression model established in the step B. Organic carbon Density of soil layer i SOCDiExpressed as a function relation of soil organic carbon content SOC, the expression is three: SOCDi＝Hi×(a×SOCi+ b) wherein HiThe thickness (cm) of the soil layer of the ith layer. The section of a certain soil body is composed of m soil layers, and the organic carbon density SOCD of the section is expressed as a function relation of the organic carbon content of the soilThe expression is as follows:
Figure BDA0002833958880000031
the soil organic carbon storage SOCS is expressed as a function of soil organic carbon content, and the expression is as follows:
Figure BDA0002833958880000032
Figure BDA0002833958880000033
wherein S is the area of the study region.
Example 1: (Chinese soil system classification method is adopted for dividing soil layers in soil section)
This example takes the estimation of organic carbon density and carbon reserve in soil in Jiangsu province as an example. The soil systems in the range of Jiangsu province are mainly distributed in 5 soil classes of artificial soil, eluvial soil, salinized soil, prototype soil and new soil, 173 representative soil system sections and 692 soil layer samples are obtained. The organic carbon content ranged between 0.17g/kg and 28.59g/kg, with an average of 6.51 g/kg. The organic carbon density (SOCD) of the soil in unit centimeter depth is obtained by calculationpcm) Between 0.029t/hm2And 4.295t/hm2In between, the average value is 0.867t/hm2。
Construction of soil organic carbon Density per centimeter depth (SOCD)pcm) And a linear regression model of the organic carbon content to obtain an expression as follows: SOCDpcm0.1119 × SOC + 0.1387. Fig. 2 is a scatter diagram of the organic carbon density and organic carbon content of soil per centimeter depth in example 1 of the present invention, and it can be seen how well the organic carbon density and organic carbon content of soil samples per centimeter depth fit. Modeling determination coefficient R between organic carbon density and organic carbon content of soil in unit centimeter depth2The modeling root mean square error RMSE is only 0.16t/hm up to 0.93742And the model has the capability of high-precision prediction. The result shows that the method can accurately and quickly estimate the organic carbon density of the soil in the depth of unit centimeter through the organic carbon content.
Further, the organic carbon density SOCD of the soil layer i can be obtainediThe expression is: SOCDi＝Hi×(0.1119×SOCi+0.1387) formula (I) wherein HiThe thickness (cm) of the soil layer of the ith layer; the section organic carbon density SOCD expression of a certain soil body is as follows:
Figure BDA0002833958880000041
the expression of the organic carbon reserve of the soil is as follows:
Figure BDA0002833958880000042
wherein S is the area of the study region.
Example 2: (soil layer in soil profile is divided by fixed sampling depth)
This embodiment takes the estimation of the organic carbon density and carbon reserve of the soil in east region of the fang gong dyke of east-tai city of Jiangsu province as an example. The research area is saline soil developed by coastal sediments for nearly millennium, 11 sections are sequentially collected from east to west in the east area of the Van Gong embankment and perpendicular to the coastline, 10 samples are collected on each section according to a specific sampling interval, the sampling depth is 0-5cm, 5-10cm, 10-15cm, 15-20cm, 20-30cm, 30-40cm, 40-50cm, 50-60cm, 60-80cm and 80-100cm, and 110 soil samples are collected.
The organic carbon content in the study area ranged between 1.00g/kg and 17.03g/kg, with an average of 4.67 g/kg. Calculating to obtain the Soil Organic Carbon Density (SOCD) in unit centimeter depth by an expression Ipcm) In the range of 0.13t/hm2And 1.86t/hm2In between, the average value is 0.64t/hm2. Soil organic carbon density per centimeter depth (SOCD)pcm) Both are significantly correlated at the 0.01 level (two-sided), with Pearson correlation coefficients as high as 0.985. Constructing a linear regression model of the two, and obtaining an expression as follows: SOCDpcm0.1243 × SOC + 0.0605. FIG. 3 is a scatter plot of organic carbon density and organic carbon content in soil per centimeter depth in example 2 of the present invention, which shows that the fitting degree of organic carbon density and organic carbon content in soil sample per centimeter depth is very high, and that the model determination coefficient R is2The modeling root mean square error RMSE is only 0.08t/hm up to 0.96992. The result shows that the method can accurately and quickly estimate the depth per centimeter through the content of the organic carbonSoil organic carbon density.
Further, the organic carbon density SOCD of the soil layer i can be obtainediThe expression is as follows: SOCDi＝Hi×(0.1243×SOCi+ 0.0605); the section organic carbon density SOCD expression of a certain soil body is as follows:
Figure BDA0002833958880000043
Figure BDA0002833958880000044
the expression of the organic carbon reserve of the soil is as follows:
Figure BDA0002833958880000045
Figure BDA0002833958880000046
in the formula HiThe thickness (cm) of the soil layer of the ith layer, and S is the area of the research area.
Although in the above examples two types of soil profile division data were used for soil organic carbon density and carbon reserve estimation, the method is still applicable to other soil profile hierarchical division data, for example, the method is still applicable to soil organic carbon density and carbon reserve estimation based on the thickness of the occurrence layer.
Aiming at the problems that the volume weight and the gravel content data are difficult to obtain in the soil organic carbon density calculation, and further the soil carbon reserve calculation is extremely inconvenient, the method establishes a new method and a new model for accurately and quickly estimating the organic carbon density and the organic carbon reserve through the organic carbon content through the high fitting degree of the soil organic carbon density and the organic carbon content in the unit centimeter depth; the method solves the problems in the prior art, and can obtain the organic carbon density and carbon reserve of the soil under the condition of volume weight and gravel content data loss.

Claims (4)

1. A soil organic carbon density and reserve estimation method is characterized by comprising the following steps: the method comprises the following steps:
step A: setting soil sampling point positions, collecting profile samples of soil bodies, and measuring the thickness of each soil layer; testing the organic carbon content of each soil layer, and the volume percentage and volume weight index of the gravel with the thickness of more than 2 mm;
and B: calculating the organic carbon density of soil in unit centimeter depth of each soil layer sample, and establishing a linear regression model of the organic carbon density of the soil in unit centimeter depth and the organic carbon content of the soil;
and C: and B, respectively establishing the functional relations between the organic carbon density and the organic carbon content of the soil and between the organic carbon reserve and the organic carbon content based on the linear regression model established in the step B.
2. The soil organic carbon density and reserve estimation method according to claim 1, wherein: and B, the density of the organic carbon in the soil with the depth of unit centimeter is the reserve of the organic carbon in the soil with the thickness of 1cm in unit area, and the expression is as follows:
SOCDpcm＝SOC×BD×H×(1-G/100)/10，
wherein SOC is the organic carbon content of soil, BD is the soil volume weight, H is the soil layer thickness, and G is the volume percentage of gravel larger than 2 mm; establishing a linear regression model, wherein the expression is as follows:
SOCDpcmin the formula, a and b are both calibration coefficients.
3. The soil organic carbon density and reserve estimation method according to claim 2, wherein: b, determining the modeling precision of the linear regression model through a coefficient R2And the root mean square error RMSE, where R2The larger the RMSE, the smaller the RMSE, the higher the modeling accuracy.
4. The soil organic carbon density and reserve estimation method according to claim 2 or 3, wherein: organic carbon Density of soil layer i SOCD in step CiExpressed as a function of the organic carbon content of the soil, the expression is:
SOCDi＝Hi×(a×SOCi+ b) wherein HiThe thickness of the ith layer;
a certain soil bodyThe organic carbon density SOCD of the section is expressed as a function of the organic carbon content of the soil, and the expression is as follows:
Figure FDA0002833958870000011
the soil organic carbon storage SOCS is expressed as a function of soil organic carbon content, and the expression is as follows:
Figure FDA0002833958870000012
wherein S is the area of the study region.
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CN114088916A (en) * 2021-11-19 2022-02-25 山西伟爱量子生态科技有限公司 Method for increasing soil carbon reserve for carbon sequestration agriculture
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Publication number Priority date Publication date Assignee Title
US11499956B2 (en) * 2019-06-28 2022-11-15 Institute Of Geochemistry, Chinese Academy Of Sciences Method for estimating soil organic carbon in karst area
CN114088916A (en) * 2021-11-19 2022-02-25 山西伟爱量子生态科技有限公司 Method for increasing soil carbon reserve for carbon sequestration agriculture
CN114169161A (en) * 2021-12-02 2022-03-11 辽宁省农业发展服务中心 Method and system for estimating space-time variation and carbon sequestration potential of soil organic carbon
CN114663782A (en) * 2022-04-13 2022-06-24 中科海慧（天津）科技有限公司 Forestry carbon source remittance method for forestry environment data
CN114858977A (en) * 2022-04-29 2022-08-05 中国科学院东北地理与农业生态研究所 Method and system for calculating field organic carbon conversion rate of straws
CN115480046A (en) * 2022-10-11 2022-12-16 中国科学院地理科学与资源研究所 Estimation method for predicting soil carbon reserves based on loess thickness

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