Interactions of fertilisation and crop productivity in soil nitrogen cycle microbiome and gas emissions

作者：Laura Kuusemets, Ülo Mander, Jordi Escuer-Gatius, Alar Astover, Karin Kauer, Kaido Soosaar, Mikk Espenberg · 发表于：SOIL · 年份：2025 · DOI：10.5194/soil-11-1-2025 · 被引用次数：17 · 研究领域：Soil Carbon and Nitrogen Dynamics、Soil and Water Nutrient Dynamics、Groundwater and Isotope Geochemistry

Fertilised soils are a significant source of nitrous oxide (N 2 O), a highly active greenhouse gas and a stratospheric ozone depleter. Nitrogen (N) fertilisers, while boosting crop yield, also lead to N 2 O emissions into the atmosphere, impacting global warming. We investigated relationships between mineral N fertilisation rates and additional manure amendment with different crop types through the analysis of abundances of N cycle functional genes, soil N 2 O and N 2 emissions, nitrogen use efficiency (NUE), soil physicochemical analysis and biomass production. Our study indicates that N 2 O emissions are predominantly dependent on the mineral N fertilisation rate and enhance with an increased mineral N fertilisation rate. Crop type also has a significant impact on soil N 2 O emissions. Higher N 2 O emissions were attained with the application of manure in comparison to mineral fertilisation. Manure amendment also increased the number of N cycle genes that are significant in the variations of N 2 O. The study indicates that N 2 O emissions were mainly related to nitrification in the soil. Quantification of nitrogen cycle functional genes also showed the potential role of denitrification, comammox (complete ammonia oxidation) and dissimilatory nitrate reduction to ammonium (DNRA) processes as a source of N 2 O. Our study did not find soil moisture to be significantly linked to N 2 O emissions. The results of the study provide evidence that, for wheat, a fertilisation rate of ...