Grasslands contain enormous soil organic carbon (SOC) reserves, and even minor fluctuations may have a great effect on the climate. N, P and S in soil organic matter (SOM) have important influences on SOC sequestration. The soil in soda saline-alkali grassland is characterized by high pH, high exchangeable sodium percentage (ESP), degraded physical properties and poor nutrients. N and P are the primary limiting elements, and nutrient addition is an effective path to support grassland plant growth. In addition, as a new method for improving saline-alkali land, biochar application can significantly improve soil nutrients and soil properties. The mechanism by which biochar and nutrients interact to influence SOC sequestration in strongly soda saline-alkali grassland remains unclear. From the perspective of ecological stoichiometry and microbiology, the influences of different biochar-nutrient combinations on the characteristics of SOMs were explored in this literature review; the influences of the interactions between soil microbial biomass, microbial residues and ecological stoichiometric characteristics of SOM on organic carbon accumulation were considered in the hope of providing a scientific basis for the improvement and appropriate fertilization of degraded grassland, and accurate prediction of changes in the reserves of SOC in the grassland ecosystem.

草原蕴藏着巨大的土壤有机碳（SOC），即使很小的波动也可能对气候产生重大影响。土壤有机质（SOM）中的氮，磷和硫对SOC固存有重要影响。苏打盐碱草原的土壤具有高pH值，高交换钠百分比（ESP），物理性能下降和营养不良的特点。氮和磷是主要的限制元素，养分的添加是支持草原植物生长的有效途径。另外，作为改良盐碱地的一种新方法，生物炭的施用可以显着改善土壤养分和土壤特性。在强碱苏打盐碱草原中，生物炭和养分相互作用以影响SOC隔离的机制仍不清楚。从生态化学计量学和微生物学的角度来看，这篇文献综述探讨了不同生物炭-养分组合对SOMs特征的影响；研究了土壤微生物量，微生物残基和SOM的生态化学计量特征之间的相互作用对有机碳积累的影响，以期为改良和合理施肥退化草地提供科学依据，并准确预测储量变化SOC在草地生态系统中的分布