Nitrification and Urease Inhibitors Reducethe Stimulated Nitrous Oxide Emissionsby the Freeze-Thaw Cycles

作者：Youlong Xu, Fei Xia, Yunyin Xue, Junqiang Wang, Yuanyuan Zhao, Yanfang Zhou, Linling Ran, Haoyang Wu, Ziteng Xie, Junjie Li · 发表于：Polish Journal of Environmental Studies · 年份：2024 · DOI：10.15244/pjoes/185694 · 研究领域：Soil Carbon and Nitrogen Dynamics、Soil and Unsaturated Flow、Climate change and permafrost

Most studies have demonstrated that nitrification and urease inhibitors can reduce soil nitrous oxide (N<sub>2</sub>O) emissions from nitrogen-fertilized farmland. However, few studies have examined the potential impacts of these inhibitors on semi-arid agricultural farmland in the presence of freeze-thaw (FT) cycles. The purpose of this study was to assess the efficacy of applying the nitrification inhibitor 3,4-dimethylpyrazole phosphate (DMPP) and the urease inhibitor N-(n-butyl) thiophosphoric triamide (NBPT) to soil nitrogen transformation and studying N<sub>2</sub>O emissions through simulated indoor FT incubation to offer theoretical and technological guidance for mitigating nitrogen loss in semi-arid farmland. The results showed that urea with DMPP under freeze-thaw conditions significantly increased the inorganic nitrogen content of the soil, kept the ammonium nitrogen content of the soil at a high level, suppressed the net nitrification rate of the soil, and reduced the cumulative emission of nitrous oxide (N<sub>2</sub>O) in the soil by nearly 87.6% compared to CK. Urea incubation with NBPT under freeze-thaw conditions also significantly reduced fluxes and cumulative N<sub>2</sub>O emissions. Due to the dual inhibition of soil nitrification rate by DMPP/NBPT and the FT cycle, the addition of DMPP/NBPT during soil FT could alleviate soil N<sub>2</sub>O emission caused by the effect of the FT cycle after ure...