In order to solve the problems of unclear microbial process of nitrogen transformation and low nitrogen utilization in saline alkali soil of Ningxia irrigation area, 15N stable isotope and qPCR were used The key microbial processes of nitrogen transformation and nitrogen utilization in saline alkali soil were studied by using molecular biological methods. The effects of different management measures such as nutrient management and exogenous carbon / nitrogen input on the microbial processes of nitrogen transformation in saline alkali soil were found out. The composition and distribution characteristics of the key microbial communities of nitrogen transformation and their relationship with environmental factors were analyzed The contribution and role of microbial functional genes involved in soil nitrogen transformation in the process of nitrogen transformation, the main control factors of microbial functional genes involved in soil nitrogen transformation and their response to carbon and nitrogen input in saline alkali soil were clarified, the microbial driving mechanism of nitrogen transformation in saline alkali soil soil ecosystem was revealed, which could improve the effective management and efficient utilization of nitrogen in saline alkali soil Provide theoretical basis. Through the project research, 4-6 high-quality academic papers were published, and a research team with high research level and innovation ability for Soil Nutrient Improvement and microbial regulation in saline alkali land was cultivated.<br>
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