针对宁夏灌区盐碱地农田土壤氮素转化微生物过程不清和氮肥利用较低等问题，

Aiming at the problems of unclear nitrogen conversion microbial process and low nitrogen fertilizer utilization in saline-alkali farmland soils in Ningxia Irrigation Area, using 15N stable isotope, qPCR and other molecular biological methods, the key microbial process of nitrogen conversion in saline-alkali farmland soil, nitrogen migration and gaseous loss research , To identify the impact of different farmland management measures such as cropland nutrient management and external carbon / nitrogen input on saline-alkali soils on the microbial process of nitrogen conversion in saline-alkali soils; analyze the composition and distribution characteristics of key microbial communities in nitrogen conversion and their relationship with environmental factors The relationship between the microbial functional genes involved in soil nitrogen transformation and the role of nitrogen transformation in the process of nitrogen transformation is clarified, and the main controlling factors of the microbial genes of nitrogen transformation function in saline-alkali soil and their response to carbon and nitrogen input in saline-alkali soil are revealed; The microbial driving mechanism of nitrogen conversion in farmland soil ecosystem provides a theoretical basis for optimizing the effective management of nitrogen in saline-alkali farmland and the efficient use of nitrogen fertilizer. Published 4-6 high-quality academic papers through project research, and cultivated a research team with higher research level and innovative ability to improve soil nutrients and microbial regulation in saline soil. <br><br>Carrying out research on key microbial processes and nitrogen migration and gaseous loss in soil nitrogen conversion in saline-alkali farmland, <br><br>nitrogen conversion process; microbial functional genes; soil nitrogen utilization; biological nitrogen fixation; nitrogen migration; straw return to the field; nutrient management; saline-alkaline land; Ningxia Irrigation area

针对宁夏灌区盐碱地农田土壤氮素转化微生物过程不清和氮肥利用较低等问题,采用15N稳定同位素、qPCR 等分子生物学方法,开展盐碱地农田土壤氮素转化关键微生物过程及氮素迁移、气态损失研究,旨在查明盐碱地农田养分管理、外源碳/氮输入等不同农田管理措施对盐碱土氮素转化微生物过程的影响;分析氮素转化关键微生物群落组成、分布特征及其与环境因子之间的联系;解析参与土壤氮素转化微生物功能基因在氮素转化过程中的贡献及其作用大小,明确盐碱地氮素转化功能微生物基因的主控因子及其对盐碱地碳氮输入的响应;揭示盐碱土农田土壤生态系统氮素转化的微生物驱动机制,为优化盐碱地农田氮素有效管理及氮肥高效利用提供理论基础。 Through the project research published 4-6 high-quality academic papers, training a high level of research and innovation of the soil nutrient upgrading and microbial regulation of the research team.<br><br>To carry out the study on the key microbial process of nitrogen conversion in soil soil in saline-alkali fields, as well as nitrogen migration and gaseous loss.<br><br>Nitrogen conversion process; microbial functional genes; soil nitrogen utilization; biological nitrogen fixation; nitrogen migration; straw return to the field; nutrient management; saline land; Ningxia irrigation area;

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 purpose of this study is to find out the influence of different management measures, such as nutrient management, exogenous carbon / nitrogen input and so on, on the microbial process of nitrogen transformation in saline alkali soil, and to analyze the composition, distribution characteristics and environmental factors of the key microbial communities of nitrogen transformation In order to optimize the effective management and management of nitrogen in saline alkali soil, the main control factors of microbial genes and their response to the input of carbon and nitrogen in saline alkali soil should be clarified The high efficient utilization of nitrogen fertilizer provides 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>The key microbial processes of soil nitrogen transformation, nitrogen transport and gas loss were studied,<br>Keywords nitrogen transformation process; microbial functional genes; soil nitrogen utilization; biological nitrogen fixation; nitrogen migration; straw returning; nutrient management; saline alkali land; Ningxia irrigation area;<br>