Application of Carbon Isotope Technique in Soil Carbon Cycle Research

The reserves and storage time of carbon in the soil is the largest and longest in the carbon pool of terrestrial ecosystems, and the land use pattern will affect the soil carbon storage and its cycle, so effective land use management can make the soil a carbon sink. . The process of carbon storage in soil is the change of soil organic carbon dynamic balance. Therefore, understanding the dynamic change of soil organic carbon is an important aspect to reveal the process of soil carbon cycle and its regulation mechanism. Firstly, the application of a stable isotope (13C) and radioisotope (14C) of carbon in the long-term dynamic process of ecosystem (such as the historical pattern of C3/C4 vegetation) and the soil organic carbon turnover cycle are discussed. The application of isotope tracer technology in soil organic carbon source, turnover cycle, soil CO2 flux change, component differentiation, isotopic enrichment, etc., summarizes the basic problems in soil carbon cycle research, and proposes future soil carbon cycle. The main research direction of isotope tracing.
The shift between ecosystem types can greatly affect soil organic carbon and greenhouse gas emissions, but the understanding of the potential and persistence of soil as a carbon source/sink is still not well understood. Quantitative knowledge of the carbon cycle is necessary to evaluate soil carbon storage potential in different soil ecosystems. In order to predict the soil organic carbon cycle (how soil carbon will respond to changes in soil environment associated with climate change and land-use change), a better understanding of how soil carbon turnover cycles and primary productivity change with soil environmental conditions is needed. Therefore, we should deeply study the vertical variation of soil organic carbon with depth , analyze the source and degradation state of soil organic carbon, explore the migration order of soil organic carbon in different degradation processes, and determine soil organic carbon. The time required to establish a new balancing process. By studying the vertical variation characteristics of δ13 C and δ14 C values ​​of soil organic carbon, the differences of δ13 C, δ14 C and soil organic carbon in different texture soils can be elucidated. At the same time, the carbon isotope labeling method can be used to track the dynamic process and fate of new and old carbon under the influence of climate change, and through the establishment of the characteristics parameter database of terrestrial ecosystem carbon process, the following questions are answered: 1 The distinction between autotrophic and heterotrophic breathing 2 The environmental effects of soil CO2 on the atmosphere; 3 The difference of δ13 C value of soil microbial, soil organic carbon and soil respiration CO2; 4 The relationship between δ13 C and δ14C of soil organic carbon and climate change parameters.
The study of carbon accumulation and its dynamic changes from cultivated land, grassland to plantation ecosystem is an extremely important aspect. Therefore, the following issues should be considered in the future isotope study of soil organic carbon. 1 Conducting soil organic carbon isotope tracing study to explore the traceability of carbon isotope in the development of forest ecosystems; 2 Quantitative analysis of soil organic carbon turnover rate, determination of soil organic carbon sources, identification of different components of soil respiration; 3 To explore the vertical variation of soil carbon 13 C and 14 C with depth and the reasons for the difference; 4 to analyze the basic mechanism of soil organic carbon enrichment of 13C and 14C, and further evaluate the carbon storage potential of forest ecosystem; 5 clarify the texture, bulk density and The relationship between soil carbon; 6 the difference in the contribution of autotrophic and heterotrophic respiration in soil CO2 flux during the growing and non-growth seasons.


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AROMA DIFFUSER

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