Estimating fractions of N2O emissions from nitrification and denitrification using data assimilation

作者：Baobao Pan, Yuanyuan Huang, Longlong Xia, Junyi Liang, Rui Liu, Yiqi Luo, Zhenggang Du, Deli Chen, Shu Kee Lam · 发表于：Biogeochemistry · 年份：2025 · DOI：10.1007/s10533-025-01268-x · 被引用次数：5 · 研究领域：Wastewater Treatment and Nitrogen Removal、Soil and Water Nutrient Dynamics、Hydrology and Watershed Management Studies

Abstract Nitrous oxide (N 2 O) emissions play a significant role in global warming and stratospheric ozone depletion. Nitrification and denitrification represent the primary pathways of N 2 O emissions in agroecosystems. However, modelling the responses of nitrification, denitrification, and subsequent N 2 O emissions to soil conditions and nitrification inhibitors remains challenging, as the fractions of N 2 O emissions derived from nitrification and denitrification used in model simulations cannot be directly measured. In this study, we estimated soil nitrification, denitrification, N 2 O emissions, and their related parameters via data assimilation under various soil moisture levels [water-filled pore space (WFPS) at 50% and 70%], incubation temperature (15, 25 and 35 °C) and nitrification inhibitor application (DMPP, 3MPTZ and C 2 H 2 ) in cereal and vegetable production systems in Australia. We found that the contribution of nitrification to N 2 O emissions (i.e., the fraction of N 2 O emitted from nitrification, $${f}_{{\text{N}}_2{\text{O}}\_nit}$$ f N 2 O _ n i t ) decreased with increasing temperature and moisture content, whereas denitrification dominated N 2 O production (i.e., the fraction of N 2 O emitted from denitrification, $${f}_{N2O\_dni}$$ f N 2 O _ d n i ) under 70% WFPS regardless of temperatures. Under fertilizer N application, the use of nitrification inhibitors decreased $${f}_{{\text{N}}_2{\t...