Effects of Biochar and Organic Additives on CO2 Emissions and the Microbial Community at Two Water Saturations in Saline–Alkaline Soil

The nutrient-limiting conditions in saline–alkali soil as well the salinity and alkalinity stress are successfully alleviated by water management measures addition of organic matter. However, impacts these two strategies on microbe-driven CO2 emissions saline–alkaline soils not yet clear. Therefore, a 150-day incubation experiment was conducted this study to evaluate short-term effects regulation matter with different characteristics microbial community under non-flooding conditions. This at saturations, i.e., 50% WFPS 80% WFPS. In addition, five treatments were conducted: CK: control; N: urea; SN: Straw + SNH: urea agent; SNB: biochar. results demonstrated that compared WFPS, significantly increased cumulative emission 27.66%, but decreased salt content fungal Chao1 Shannon indices. application biochar agent SN treatment 27.39% 14.92%, respectively. When sufficient carbon supply is available, decrease diversity may reduce emission. findings SNH SNB might straw intake loss labile (LOC). Additionally, can alleviate caused salinity, which has favorable impact enhancing storage salinity-affected dryland soils.