Team of Hohai University professor has made new progress in the study of water -saving and irrigated paddy field carbon stability mechanism

近日，河海大学徐俊增教授课题组在国际土壤学领域的著名学术期刊Soil Biology and Biochemistry上发表题为“Carbon pathways in aggregates and density fractions in Mollisols under water and straw management: Evidence from 13C natural abundance”的论文It reveals new progress of water -saving irrigation of the research on the soil stability of rice fields.

The paddy field soil accounts for about 40 % of China's total soil carbon fixation potential, so it plays an important role in alleviating global warming and evaluating global soil carbon. The soil -solid carbon process is generally evaluated by changes in carbon library, reunion formation, and humus formation, but few people indicate the carbon flux between the cluster and the internal carbon. At the same time, due to the different paddy fields and carbon management models, the complexity and uncertainty of soil carbon stability and direction are increased. In order to track the stabilization of carbon soil in the paddy field soil under different water carbon management models, the research uses the 13C natural abundance method to select field trials that are treated with different irrigation and straw to return to the field, and analyze soil reunion and organic matter (SOM) density components. The carbon content and carbon isotopes are composed of carbon isotope. Through the establishment of the natural abundance index of carbon isotopes, the standardization processing and objective empowerment method of data can be used to achieve the calculation of the natural abundance of various carbon isotopes of the soil, thereby avoiding the uncertainty of the marking uncertainty. The complexity of sex and operation reveals the carbon stabilization path between the soil aggregate and soil organic matter (SOM) density components in different water carbon management models.

The work is one of the latest progress in the team's recent research on water -saving irrigation of rice carbon turnover and its microbial mechanism. In recent years, the team has made a series of explorations such as the key processes such as the source of soil organic carbon sources, formation, conversion and stability under different water carbon regulation, and its microbial driving mechanism. The information helps to tap the potential of soil carbon exchange, slow down the greenhouse effect, and help the carbon neutrality.

The research work has been supported by the National Natural Science Foundation of China, the Jiangsu Natural Science Foundation, and the Zhejiang Science and Technology Plan Project. (Correspondent: Zhang Chunping, Hohai University)

- END -