The issue of soil carbon storage is a fundamental issue in the study of atmospheric greenhouse effect and global change. Chinese geologists combined multi-target regional geochemical surveys with global climate change studies, proposed the concept of "unit soil carbon content" and calculation methods in the study of soil carbon storage, and calculated that the national average soil organic carbon storage is 15339.20 tons per square kilometer. , provide accurate basic data for global carbon cycle research. The researcher of the China Geological Survey (CGS), Xiaohuan Huan, made a report on “Study of Soil Carbon Storage and Carbon Cycle in China†at the recent Xiangshan Science Conference and elaborated relevant research results.
Soil is not only the main carbon source for releasing carbon dioxide, but also the soil's huge carbon capacity and natural carbon sequestration are one of the economically effective ways to mitigate carbon release. Soil carbon stocks also affect the fertility of the land. Therefore, the issue of soil carbon pools has always been the focus of carbon cycle and global change research.
From qualitative to quantitative analysis, it is a qualitative leap in the development of scientific research. However, in the past, calculation methods for soil carbon storage, such as soil type method, vegetation type method, and model method, all estimated soil carbon stocks after considering various factors. The China Geological Survey began in 1999 with a double-layer gridded soil measurement method to implement a national multi-target regional geochemical survey. By 2008, the survey area will be 1.6 million square kilometers, basically covering the plains basins, lake wetlands and near-shore beaches in China. For the first time, high-precision large-scale data of 54 elements including organic carbon and carbon in the surface and deep layers of China have been systematically obtained in regions such as low hills and Loess Plateau. Based on the national multi-target regional geochemical survey, the concept and calculation method of “unit soil carbon content†was proposed, so that the carbon reserves could be quantitatively studied.
The specific calculation method for unit soil carbon content (USCA) proposed by researchers in China is that the soil surface sample sample analysis unit determined by the multi-target regional geochemical survey is 4 km 2 as the calculation unit, and the corresponding soil surface sample carbon content and its corresponding The deep-seated carbon content is the calculated data, and the unit soil carbon content is calculated based on the soil carbon content distribution model (USCA) = S × 4 × 104 × Ï; the unit soil carbon amount is added and calculated to obtain the soil carbon stock in a certain area. . Researchers used the method of soil carbon content per unit to study the calculation and distribution characteristics of soil carbon storage according to different regions and different soil types, land use patterns, ecosystems, landform types, and parent materials, and obtained the first time accurate soil carbon storage in China. System and rich data. According to the average soil organic carbon storage (0-180 cm), the order of Sichuan Basin is 24,813 tons per square kilometer, Hunan Dongting Lake Plain is 18,171 tons per square kilometer, Jilin Plain is 14,473 tons per square kilometer, and Jiangsu Province is 13,802 tons per square meter. Kilometers, 12,124 tons per square kilometer in Shaanxi Weihe plain, and 10,525 tons per square kilometer in Hebei plain indicate that the overall distribution of soil organic carbon reserves in China is uneven, with distinctive features. According to the weighted average statistics, the national average soil organic carbon reserve was 15339.20 tons/km2; at the same time, the distribution of unit soil carbon was further compiled in each region. The difference in the distribution of soil organic carbon reserves in China shows that China has a huge carbon storage space and carbon sequestration capacity, providing an important scientific basis for the country to obtain a say in the field of global change.
In addition, according to the same method, the researchers performed calculation of the amount of soil element (oxide) per unit and obtained 52 kinds of elements and oxides of soil, which provided new basic data for soil science research.
Soil is not only the main carbon source for releasing carbon dioxide, but also the soil's huge carbon capacity and natural carbon sequestration are one of the economically effective ways to mitigate carbon release. Soil carbon stocks also affect the fertility of the land. Therefore, the issue of soil carbon pools has always been the focus of carbon cycle and global change research.
From qualitative to quantitative analysis, it is a qualitative leap in the development of scientific research. However, in the past, calculation methods for soil carbon storage, such as soil type method, vegetation type method, and model method, all estimated soil carbon stocks after considering various factors. The China Geological Survey began in 1999 with a double-layer gridded soil measurement method to implement a national multi-target regional geochemical survey. By 2008, the survey area will be 1.6 million square kilometers, basically covering the plains basins, lake wetlands and near-shore beaches in China. For the first time, high-precision large-scale data of 54 elements including organic carbon and carbon in the surface and deep layers of China have been systematically obtained in regions such as low hills and Loess Plateau. Based on the national multi-target regional geochemical survey, the concept and calculation method of “unit soil carbon content†was proposed, so that the carbon reserves could be quantitatively studied.
The specific calculation method for unit soil carbon content (USCA) proposed by researchers in China is that the soil surface sample sample analysis unit determined by the multi-target regional geochemical survey is 4 km 2 as the calculation unit, and the corresponding soil surface sample carbon content and its corresponding The deep-seated carbon content is the calculated data, and the unit soil carbon content is calculated based on the soil carbon content distribution model (USCA) = S × 4 × 104 × Ï; the unit soil carbon amount is added and calculated to obtain the soil carbon stock in a certain area. . Researchers used the method of soil carbon content per unit to study the calculation and distribution characteristics of soil carbon storage according to different regions and different soil types, land use patterns, ecosystems, landform types, and parent materials, and obtained the first time accurate soil carbon storage in China. System and rich data. According to the average soil organic carbon storage (0-180 cm), the order of Sichuan Basin is 24,813 tons per square kilometer, Hunan Dongting Lake Plain is 18,171 tons per square kilometer, Jilin Plain is 14,473 tons per square kilometer, and Jiangsu Province is 13,802 tons per square meter. Kilometers, 12,124 tons per square kilometer in Shaanxi Weihe plain, and 10,525 tons per square kilometer in Hebei plain indicate that the overall distribution of soil organic carbon reserves in China is uneven, with distinctive features. According to the weighted average statistics, the national average soil organic carbon reserve was 15339.20 tons/km2; at the same time, the distribution of unit soil carbon was further compiled in each region. The difference in the distribution of soil organic carbon reserves in China shows that China has a huge carbon storage space and carbon sequestration capacity, providing an important scientific basis for the country to obtain a say in the field of global change.
In addition, according to the same method, the researchers performed calculation of the amount of soil element (oxide) per unit and obtained 52 kinds of elements and oxides of soil, which provided new basic data for soil science research.
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