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Soil organic carbon density and reserve estimation method

An organic carbon and soil technology, which is applied in the field of pediology, can solve the problems of difficulty in obtaining bulk density and gravel content data, and over-reliance on bulk density and gravel content data, so as to improve accessibility, avoid over-dependence, and improve stability. Good results

Active Publication Date: 2021-05-11
NANJING UNIV OF INFORMATION SCI & TECH +1
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Problems solved by technology

[0006] The purpose of the present invention is to provide a method for estimating soil organic carbon density and storage to solve the problems of difficulty in obtaining bulk density and gravel content data and over-reliance on bulk density and gravel content data in the current calculation process of soil organic carbon density and carbon storage

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  • Soil organic carbon density and reserve estimation method
  • Soil organic carbon density and reserve estimation method

Examples

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Embodiment 1

[0027] Embodiment 1: (the division of soil layer in the soil profile adopts Chinese Soil System Classification)

[0028] This example takes the estimation of soil organic carbon density and carbon storage in Jiangsu Province as an example. Soil systems in Jiangsu Province are mainly distributed in 5 soil classes: anthropogenic soils, alluvial soils, saline soils, rudimentary soils, and neosoils. A total of 173 representative sections of soil systems and 692 soil layer samples were obtained. The organic carbon content ranged between 0.17g / kg and 28.59g / kg, with an average of 6.51g / kg. Soil organic carbon density (SOCD) per centimeter depth was obtained by calculation pcm ) between 0.029t / hm 2 and 4.295t / hm 2 between, the average value is 0.867t / hm 2 .

[0029] Construct soil organic carbon density per centimeter depth (SOCD pcm ) and the linear regression model of organic carbon content, the expression is: SOCD pcm =0.1119×SOC+0.1387. figure 2 It is the scatter diagram...

Embodiment 2

[0031] Embodiment 2: (the division of soil layer in the soil profile adopts fixed sampling depth)

[0032] This example takes the estimation of soil organic carbon density and carbon storage in the area east of Fangongdi, Dongtai City, Jiangsu Province as an example. The study area is saline soil developed from coastal sediments in the past thousand years. Eleven sections were collected from east to west in the area east of Fangongdi and perpendicular to the coastline. Each section collected 10 samples according to a specific sampling interval. The sampling depth was 0-5cm, 5-10cm, 10-15cm, 15-20cm, 20-30cm, 30-40cm, 40-50cm, 50-60cm, 60-80cm and 80-100cm, a total of 110 soil samples were collected.

[0033] The range of organic carbon content in the study area was between 1.00g / kg and 17.03g / kg, with an average value of 4.67g / kg. The soil organic carbon density (SOCD) per centimeter depth is calculated by expression 1 pcm ), the range is between 0.13t / hm 2 and 1.86t / hm 2 ...

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Abstract

The invention discloses a soil organic carbon density and reserve estimation method, and belongs to the technical field of soil measurement, and the method comprises the following steps: setting a soil sample point position, collecting a section sample of a soil body, and measuring the thickness of each soil layer at the same time; testing the organic carbon content of each soil layer, and the volume percentage and volume weight index of gravels greater than 2mm; calculating the soil organic carbon density per unit centimeter depth of each soil layer sample, and establishing a linear regression model of the soil organic carbon density per unit centimeter depth and the soil organic carbon content; and based on the established linear regression model, respectively establishing a function relationship between the soil organic carbon density and the organic carbon content and a function relationship between the organic carbon reserve and the organic carbon content. According to the invention, the soil carbon density and the carbon reserve are directly, rapidly and accurately estimated through the organic carbon content, and the availability of soil organic carbon reserve data is improved.

Description

technical field [0001] The invention relates to the technical field of soil measurement, in particular to a method for estimating soil organic carbon density and storage. Background technique [0002] Soil organic carbon is an important component of soil. It is the source of plant nutrients and plays an important role in forming soil aggregates, increasing soil water content, and reducing soil degradation and erosion. Soil is the third largest carbon pool in the earth system, and the total global soil organic carbon exceeds the total amount of atmospheric carbon pool and ecological carbon pool. Small changes in soil organic carbon will have a greater impact on atmospheric carbon dioxide, thereby affecting climate change. Rapid and accurate estimation of soil organic carbon stocks is the premise and basis for realizing the analysis of its temporal and spatial changes and then evaluating climate change. [0003] Soil carbon density is an extremely important index to evaluate ...

Claims

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Application Information

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IPC IPC(8): G01N33/24
CPCG01N33/24
Inventor 郑光辉焦彩霞徐明星
Owner NANJING UNIV OF INFORMATION SCI & TECH
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